1 /*
2 * Copyright (c) 1997, 2022, 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 */
24
25 #ifndef SHARE_OPTO_PARSE_HPP
26 #define SHARE_OPTO_PARSE_HPP
27
28 #include "ci/ciMethodData.hpp"
29 #include "ci/ciTypeFlow.hpp"
30 #include "compiler/methodLiveness.hpp"
31 #include "libadt/vectset.hpp"
32 #include "oops/generateOopMap.hpp"
33 #include "opto/graphKit.hpp"
34 #include "opto/subnode.hpp"
35
36 class BytecodeParseHistogram;
37 class InlineTree;
38 class Parse;
39 class SwitchRange;
40
41
42 //------------------------------InlineTree-------------------------------------
43 class InlineTree : public AnyObj {
44 friend class VMStructs;
45
46 Compile* C; // cache
47 JVMState* _caller_jvms; // state of caller
48 ciMethod* _method; // method being called by the caller_jvms
49 bool _late_inline; // method is inlined incrementally
50 InlineTree* _caller_tree;
51 uint _count_inline_bcs; // Accumulated count of inlined bytecodes
52 const int _max_inline_level; // the maximum inline level for this sub-tree (may be adjusted)
53
54 GrowableArray<InlineTree*> _subtrees;
55
56 bool pass_initial_checks(ciMethod* caller_method, int caller_bci, ciMethod* callee_method);
57
58 void print_impl(outputStream* stj, int indent) const PRODUCT_RETURN;
59 const char* _msg;
60 protected:
61 InlineTree(Compile* C,
62 const InlineTree* caller_tree,
63 ciMethod* callee_method,
64 JVMState* caller_jvms,
65 int caller_bci,
66 int max_inline_level);
67 InlineTree *build_inline_tree_for_callee(ciMethod* callee_method,
68 JVMState* caller_jvms,
69 int caller_bci);
70 bool try_to_inline(ciMethod* callee_method,
71 ciMethod* caller_method,
72 int caller_bci,
73 JVMState* jvms,
74 ciCallProfile& profile,
75 bool& should_delay);
76 bool should_inline(ciMethod* callee_method,
77 ciMethod* caller_method,
78 int caller_bci,
79 NOT_PRODUCT_ARG(bool& should_delay)
80 ciCallProfile& profile);
81 bool should_not_inline(ciMethod* callee_method,
82 ciMethod* caller_method,
83 int caller_bci,
84 NOT_PRODUCT_ARG(bool& should_delay)
85 ciCallProfile& profile);
86 bool is_not_reached(ciMethod* callee_method,
87 ciMethod* caller_method,
88 int caller_bci,
89 ciCallProfile& profile);
90 void print_inlining(ciMethod* callee_method, int caller_bci,
91 ciMethod* caller_method, bool success) const;
92
93 InlineTree* caller_tree() const { return _caller_tree; }
94 InlineTree* callee_at(int bci, ciMethod* m) const;
95 int stack_depth() const { return _caller_jvms ? _caller_jvms->depth() : 0; }
96 const char* msg() const { return _msg; }
97 void set_msg(const char* msg) { _msg = msg; }
98 public:
99 static const char* check_can_parse(ciMethod* callee);
100
101 static InlineTree* build_inline_tree_root();
102 static InlineTree* find_subtree_from_root(InlineTree* root, JVMState* jvms, ciMethod* callee);
103
104 // See if it is OK to inline.
105 // The receiver is the inline tree for the caller.
106 //
107 // The result is a temperature indication. If it is hot or cold,
108 // inlining is immediate or undesirable. Otherwise, the info block
109 // returned is newly allocated and may be enqueued.
110 //
111 // If the method is inlinable, a new inline subtree is created on the fly,
112 // and may be accessed by find_subtree_from_root.
113 // The call_method is the dest_method for a special or static invocation.
114 // The call_method is an optimized virtual method candidate otherwise.
115 bool ok_to_inline(ciMethod *call_method, JVMState* caller_jvms, ciCallProfile& profile, bool& should_delay);
116
117 void set_late_inline() {
118 _late_inline = true;
119 }
120
121 // Information about inlined method
122 JVMState* caller_jvms() const { return _caller_jvms; }
123 ciMethod *method() const { return _method; }
124 int caller_bci() const { return _caller_jvms ? _caller_jvms->bci() : InvocationEntryBci; }
125 uint count_inline_bcs() const { return _count_inline_bcs; }
126 int inline_level() const { return stack_depth(); }
127
128 #ifndef PRODUCT
129 private:
130 uint _count_inlines; // Count of inlined methods
131 public:
132 // Debug information collected during parse
133 uint count_inlines() const { return _count_inlines; };
134 #endif
135 GrowableArray<InlineTree*> subtrees() { return _subtrees; }
136
137 void print_value_on(outputStream* st) const PRODUCT_RETURN;
138
139 bool _forced_inline; // Inlining was forced by CompilerOracle, ciReplay or annotation
140 bool forced_inline() const { return _forced_inline; }
141 // Count number of nodes in this subtree
142 int count() const;
143 // Dump inlining replay data to the stream.
144 void dump_replay_data(outputStream* out, int depth_adjust = 0);
145 };
146
147
148 //-----------------------------------------------------------------------------
149 //------------------------------Parse------------------------------------------
150 // Parse bytecodes, build a Graph
151 class Parse : public GraphKit {
152 public:
153 // Per-block information needed by the parser:
154 class Block {
155 private:
156 ciTypeFlow::Block* _flow;
157 int _pred_count; // how many predecessors in CFG?
158 int _preds_parsed; // how many of these have been parsed?
159 uint _count; // how many times executed? Currently only set by _goto's
160 bool _is_parsed; // has this block been parsed yet?
161 bool _is_handler; // is this block an exception handler?
162 bool _has_merged_backedge; // does this block have merged backedge?
163 SafePointNode* _start_map; // all values flowing into this block
164 MethodLivenessResult _live_locals; // lazily initialized liveness bitmap
165 bool _has_predicates; // Were predicates added before parsing of the loop head?
166
167 int _num_successors; // Includes only normal control flow.
168 int _all_successors; // Include exception paths also.
169 Block** _successors;
170
171 public:
172
173 // Set up the block data structure itself.
174 Block(Parse* outer, int rpo);
175
176 // Set up the block's relations to other blocks.
177 void init_graph(Parse* outer);
178
179 ciTypeFlow::Block* flow() const { return _flow; }
180 int pred_count() const { return _pred_count; }
181 int preds_parsed() const { return _preds_parsed; }
182 bool is_parsed() const { return _is_parsed; }
183 bool is_handler() const { return _is_handler; }
184 void set_count( uint x ) { _count = x; }
185 uint count() const { return _count; }
186
187 SafePointNode* start_map() const { assert(is_merged(),""); return _start_map; }
188 void set_start_map(SafePointNode* m) { assert(!is_merged(), ""); _start_map = m; }
189
190 // True after any predecessor flows control into this block
191 bool is_merged() const { return _start_map != NULL; }
192
193 #ifdef ASSERT
194 // True after backedge predecessor flows control into this block
195 bool has_merged_backedge() const { return _has_merged_backedge; }
196 void mark_merged_backedge(Block* pred) {
197 assert(is_SEL_head(), "should be loop head");
198 if (pred != NULL && is_SEL_backedge(pred)) {
199 assert(is_parsed(), "block should be parsed before merging backedges");
200 _has_merged_backedge = true;
201 }
202 }
203 #endif
204
205 // True when all non-exception predecessors have been parsed.
206 bool is_ready() const { return preds_parsed() == pred_count(); }
207
208 bool has_predicates() const { return _has_predicates; }
209 void set_has_predicates() { _has_predicates = true; }
210
211 int num_successors() const { return _num_successors; }
212 int all_successors() const { return _all_successors; }
213 Block* successor_at(int i) const {
214 assert((uint)i < (uint)all_successors(), "");
215 return _successors[i];
216 }
217 Block* successor_for_bci(int bci);
218
219 int start() const { return flow()->start(); }
220 int limit() const { return flow()->limit(); }
221 int rpo() const { return flow()->rpo(); }
222 int start_sp() const { return flow()->stack_size(); }
223
224 bool is_loop_head() const { return flow()->is_loop_head(); }
225 bool is_SEL_head() const { return flow()->is_single_entry_loop_head(); }
226 bool is_SEL_backedge(Block* pred) const{ return is_SEL_head() && pred->rpo() >= rpo(); }
227 bool is_invariant_local(uint i) const {
228 const JVMState* jvms = start_map()->jvms();
229 if (!jvms->is_loc(i) || flow()->outer()->has_irreducible_entry()) return false;
230 return flow()->is_invariant_local(i - jvms->locoff());
231 }
232 bool can_elide_SEL_phi(uint i) const { assert(is_SEL_head(),""); return is_invariant_local(i); }
233
234 const Type* peek(int off=0) const { return stack_type_at(start_sp() - (off+1)); }
235
236 const Type* stack_type_at(int i) const;
237 const Type* local_type_at(int i) const;
238 static const Type* get_type(ciType* t) { return Type::get_typeflow_type(t); }
239
240 bool has_trap_at(int bci) const { return flow()->has_trap() && flow()->trap_bci() == bci; }
241
242 // Call this just before parsing a block.
243 void mark_parsed() {
244 assert(!_is_parsed, "must parse each block exactly once");
245 _is_parsed = true;
246 }
247
248 // Return the phi/region input index for the "current" pred,
249 // and bump the pred number. For historical reasons these index
250 // numbers are handed out in descending order. The last index is
251 // always PhiNode::Input (i.e., 1). The value returned is known
252 // as a "path number" because it distinguishes by which path we are
253 // entering the block.
254 int next_path_num() {
255 assert(preds_parsed() < pred_count(), "too many preds?");
256 return pred_count() - _preds_parsed++;
257 }
258
259 // Add a previously unaccounted predecessor to this block.
260 // This operates by increasing the size of the block's region
261 // and all its phi nodes (if any). The value returned is a
262 // path number ("pnum").
263 int add_new_path();
264
265 // Initialize me by recording the parser's map. My own map must be NULL.
266 void record_state(Parse* outer);
267 };
268
269 #ifndef PRODUCT
270 // BytecodeParseHistogram collects number of bytecodes parsed, nodes constructed, and transformations.
271 class BytecodeParseHistogram : public ArenaObj {
272 private:
273 enum BPHType {
274 BPH_transforms,
275 BPH_values
276 };
277 static bool _initialized;
278 static uint _bytecodes_parsed [Bytecodes::number_of_codes];
279 static uint _nodes_constructed[Bytecodes::number_of_codes];
280 static uint _nodes_transformed[Bytecodes::number_of_codes];
281 static uint _new_values [Bytecodes::number_of_codes];
282
283 Bytecodes::Code _initial_bytecode;
284 int _initial_node_count;
285 int _initial_transforms;
286 int _initial_values;
287
288 Parse *_parser;
289 Compile *_compiler;
290
291 // Initialization
292 static void reset();
293
294 // Return info being collected, select with global flag 'BytecodeParseInfo'
295 int current_count(BPHType info_selector);
296
297 public:
298 BytecodeParseHistogram(Parse *p, Compile *c);
299 static bool initialized();
300
301 // Record info when starting to parse one bytecode
302 void set_initial_state( Bytecodes::Code bc );
303 // Record results of parsing one bytecode
304 void record_change();
305
306 // Profile printing
307 static void print(float cutoff = 0.01F); // cutoff in percent
308 };
309
310 public:
311 // Record work done during parsing
312 BytecodeParseHistogram* _parse_histogram;
313 void set_parse_histogram(BytecodeParseHistogram *bph) { _parse_histogram = bph; }
314 BytecodeParseHistogram* parse_histogram() { return _parse_histogram; }
315 #endif
316
317 private:
318 friend class Block;
319
320 // Variables which characterize this compilation as a whole:
321
322 JVMState* _caller; // JVMS which carries incoming args & state.
323 float _expected_uses; // expected number of calls to this code
324 float _prof_factor; // discount applied to my profile counts
325 int _depth; // Inline tree depth, for debug printouts
326 const TypeFunc*_tf; // My kind of function type
327 int _entry_bci; // the osr bci or InvocationEntryBci
328
329 ciTypeFlow* _flow; // Results of previous flow pass.
330 Block* _blocks; // Array of basic-block structs.
331 int _block_count; // Number of elements in _blocks.
332
333 GraphKit _exits; // Record all normal returns and throws here.
334 bool _wrote_final; // Did we write a final field?
335 bool _wrote_volatile; // Did we write a volatile field?
336 bool _wrote_stable; // Did we write a @Stable field?
337 bool _wrote_fields; // Did we write any field?
338 Node* _alloc_with_final; // An allocation node with final field
339
340 // Variables which track Java semantics during bytecode parsing:
341
342 Block* _block; // block currently getting parsed
343 ciBytecodeStream _iter; // stream of this method's bytecodes
344
345 const FastLockNode* _synch_lock; // FastLockNode for synchronized method
346
347 #ifndef PRODUCT
348 int _max_switch_depth; // Debugging SwitchRanges.
349 int _est_switch_depth; // Debugging SwitchRanges.
350 #endif
351
352 bool _first_return; // true if return is the first to be parsed
353 bool _replaced_nodes_for_exceptions; // needs processing of replaced nodes in exception paths?
354 uint _new_idx; // any node with _idx above were new during this parsing. Used to trim the replaced nodes list.
355
356 public:
357 // Constructor
358 Parse(JVMState* caller, ciMethod* parse_method, float expected_uses);
359
360 virtual Parse* is_Parse() const { return (Parse*)this; }
361
362 // Accessors.
363 JVMState* caller() const { return _caller; }
364 float expected_uses() const { return _expected_uses; }
365 float prof_factor() const { return _prof_factor; }
366 int depth() const { return _depth; }
367 const TypeFunc* tf() const { return _tf; }
368 // entry_bci() -- see osr_bci, etc.
369
370 ciTypeFlow* flow() const { return _flow; }
371 // blocks() -- see rpo_at, start_block, etc.
372 int block_count() const { return _block_count; }
373
374 GraphKit& exits() { return _exits; }
375 bool wrote_final() const { return _wrote_final; }
376 void set_wrote_final(bool z) { _wrote_final = z; }
377 bool wrote_volatile() const { return _wrote_volatile; }
378 void set_wrote_volatile(bool z) { _wrote_volatile = z; }
379 bool wrote_stable() const { return _wrote_stable; }
380 void set_wrote_stable(bool z) { _wrote_stable = z; }
381 bool wrote_fields() const { return _wrote_fields; }
382 void set_wrote_fields(bool z) { _wrote_fields = z; }
383 Node* alloc_with_final() const { return _alloc_with_final; }
384 void set_alloc_with_final(Node* n) {
385 assert((_alloc_with_final == NULL) || (_alloc_with_final == n), "different init objects?");
386 _alloc_with_final = n;
387 }
388
389 Block* block() const { return _block; }
390 ciBytecodeStream& iter() { return _iter; }
391 Bytecodes::Code bc() const { return _iter.cur_bc(); }
392
393 void set_block(Block* b) { _block = b; }
394
395 // Derived accessors:
396 bool is_normal_parse() const { return _entry_bci == InvocationEntryBci; }
397 bool is_osr_parse() const { return _entry_bci != InvocationEntryBci; }
398 int osr_bci() const { assert(is_osr_parse(),""); return _entry_bci; }
399
400 void set_parse_bci(int bci);
401
402 // Must this parse be aborted?
403 bool failing() { return C->failing(); }
404
405 Block* rpo_at(int rpo) {
406 assert(0 <= rpo && rpo < _block_count, "oob");
407 return &_blocks[rpo];
408 }
409 Block* start_block() {
410 return rpo_at(flow()->start_block()->rpo());
411 }
412 // Can return NULL if the flow pass did not complete a block.
413 Block* successor_for_bci(int bci) {
414 return block()->successor_for_bci(bci);
415 }
416
417 private:
418 // Create a JVMS & map for the initial state of this method.
419 SafePointNode* create_entry_map();
420
421 // OSR helpers
422 Node* fetch_interpreter_state(int index, const Type* type, Node* local_addrs, Node* local_addrs_base);
423 Node* check_interpreter_type(Node* l, const Type* type, SafePointNode* &bad_type_exit);
424 void load_interpreter_state(Node* osr_buf);
425
426 // Functions for managing basic blocks:
427 void init_blocks();
428 void load_state_from(Block* b);
429 void store_state_to(Block* b) { b->record_state(this); }
430
431 // Parse all the basic blocks.
432 void do_all_blocks();
433
434 // Parse the current basic block
435 void do_one_block();
436
437 // Raise an error if we get a bad ciTypeFlow CFG.
438 void handle_missing_successor(int bci);
439
440 // first actions (before BCI 0)
441 void do_method_entry();
442
443 // implementation of monitorenter/monitorexit
444 void do_monitor_enter();
445 void do_monitor_exit();
446
447 // Eagerly create phie throughout the state, to cope with back edges.
448 void ensure_phis_everywhere();
449
450 // Merge the current mapping into the basic block starting at bci
451 void merge( int target_bci);
452 // Same as plain merge, except that it allocates a new path number.
453 void merge_new_path( int target_bci);
454 // Merge the current mapping into an exception handler.
455 void merge_exception(int target_bci);
456 // Helper: Merge the current mapping into the given basic block
457 void merge_common(Block* target, int pnum);
458 // Helper functions for merging individual cells.
459 PhiNode *ensure_phi( int idx, bool nocreate = false);
460 PhiNode *ensure_memory_phi(int idx, bool nocreate = false);
461 // Helper to merge the current memory state into the given basic block
462 void merge_memory_edges(MergeMemNode* n, int pnum, bool nophi);
463
464 // Parse this bytecode, and alter the Parsers JVM->Node mapping
465 void do_one_bytecode();
466
467 // helper function to generate array store check
468 Node* array_store_check(Node*& adr, const Type*& elemtype);
469 // Helper function to generate array load
470 void array_load(BasicType etype);
471 // Helper function to generate array store
472 void array_store(BasicType etype);
473 // Helper function to compute array addressing
474 Node* array_addressing(BasicType type, int vals, const Type*& elemtype);
475 Node* record_profile_for_speculation_at_array_load(Node* ld);
476
477 void clinit_deopt();
478
479 void rtm_deopt();
480
481 // Pass current map to exits
482 void return_current(Node* value);
483
484 // Register finalizers on return from Object.<init>
485 void call_register_finalizer();
486
487 // Insert a compiler safepoint into the graph
488 void add_safepoint();
489
490 // Insert a compiler safepoint into the graph, if there is a back-branch.
491 void maybe_add_safepoint(int target_bci) {
492 if (target_bci <= bci()) {
493 add_safepoint();
494 }
495 }
496
497 // Note: Intrinsic generation routines may be found in library_call.cpp.
498
499 // Helper function to setup Ideal Call nodes
500 void do_call();
501
502 // Helper function to uncommon-trap or bailout for non-compilable call-sites
503 bool can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass *klass);
504
505 // Helper functions for type checking bytecodes:
506 void do_checkcast();
507 void do_instanceof();
508
509 // Helper functions for shifting & arithmetic
510 void modf();
511 void modd();
512 void l2f();
513
514 // implementation of _get* and _put* bytecodes
515 void do_getstatic() { do_field_access(true, false); }
516 void do_getfield () { do_field_access(true, true); }
517 void do_putstatic() { do_field_access(false, false); }
518 void do_putfield () { do_field_access(false, true); }
519
520 // common code for making initial checks and forming addresses
521 void do_field_access(bool is_get, bool is_field);
522
523 // common code for actually performing the load or store
524 void do_get_xxx(Node* obj, ciField* field);
525 void do_put_xxx(Node* obj, ciField* field, bool is_field);
526
527 // implementation of object creation bytecodes
528 void do_new();
529 void do_aconst_init();
530 void do_withfield();
531 void do_newarray(BasicType elemtype);
532 void do_newarray();
533 void do_multianewarray();
534 Node* expand_multianewarray(ciArrayKlass* array_klass, Node* *lengths, int ndimensions, int nargs);
535
536 // implementation of jsr/ret
537 void do_jsr();
538 void do_ret();
539
540 float dynamic_branch_prediction(float &cnt, BoolTest::mask btest, Node* test);
541 float branch_prediction(float &cnt, BoolTest::mask btest, int target_bci, Node* test);
542 bool seems_never_taken(float prob) const;
543 bool path_is_suitable_for_uncommon_trap(float prob) const;
544 bool seems_stable_comparison() const;
545
546 void do_ifnull(BoolTest::mask btest, Node* c);
547 void do_if(BoolTest::mask btest, Node* c, bool new_path = false, Node** ctrl_taken = NULL);
548 void do_acmp(BoolTest::mask btest, Node* left, Node* right);
549 void acmp_always_null_input(Node* input, const TypeOopPtr* tinput, BoolTest::mask btest, Node* eq_region);
550 void acmp_known_non_inline_type_input(Node* input, const TypeOopPtr* tinput, ProfilePtrKind input_ptr, ciKlass* input_type, BoolTest::mask btest, Node* eq_region);
551 Node* acmp_null_check(Node* input, const TypeOopPtr* tinput, ProfilePtrKind input_ptr, Node*& null_ctl);
552 void acmp_unknown_non_inline_type_input(Node* input, const TypeOopPtr* tinput, ProfilePtrKind input_ptr, BoolTest::mask btest, Node* eq_region);
553 int repush_if_args();
554 void adjust_map_after_if(BoolTest::mask btest, Node* c, float prob, Block* path);
555 void sharpen_type_after_if(BoolTest::mask btest,
556 Node* con, const Type* tcon,
557 Node* val, const Type* tval);
558 void maybe_add_predicate_after_if(Block* path);
559 IfNode* jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask, float prob, float cnt);
560 void jump_if_true_fork(IfNode *ifNode, int dest_bci_if_true, bool unc);
561 void jump_if_false_fork(IfNode *ifNode, int dest_bci_if_false, bool unc);
562 void jump_if_always_fork(int dest_bci_if_true, bool unc);
563
564 friend class SwitchRange;
565 void do_tableswitch();
566 void do_lookupswitch();
567 void jump_switch_ranges(Node* a, SwitchRange* lo, SwitchRange* hi, int depth = 0);
568 bool create_jump_tables(Node* a, SwitchRange* lo, SwitchRange* hi);
569 void linear_search_switch_ranges(Node* key_val, SwitchRange*& lo, SwitchRange*& hi);
570
571 // helper function for call statistics
572 void count_compiled_calls(bool at_method_entry, bool is_inline) PRODUCT_RETURN;
573
574 Node_Notes* make_node_notes(Node_Notes* caller_nn);
575
576 // Helper functions for handling normal and abnormal exits.
577 void build_exits();
578
579 // Fix up all exceptional control flow exiting a single bytecode.
580 void do_exceptions();
581
582 // Fix up all exiting control flow at the end of the parse.
583 void do_exits();
584
585 // Add Catch/CatchProjs
586 // The call is either a Java call or the VM's rethrow stub
587 void catch_call_exceptions(ciExceptionHandlerStream&);
588
589 // Handle all exceptions thrown by the inlined method.
590 // Also handles exceptions for individual bytecodes.
591 void catch_inline_exceptions(SafePointNode* ex_map);
592
593 // Merge the given map into correct exceptional exit state.
594 // Assumes that there is no applicable local handler.
595 void throw_to_exit(SafePointNode* ex_map);
596
597 // Use speculative type to optimize CmpP node
598 Node* optimize_cmp_with_klass(Node* c);
599
600 public:
601 #ifndef PRODUCT
602 // Handle PrintOpto, etc.
603 void show_parse_info();
604 void dump_map_adr_mem() const;
605 static void print_statistics(); // Print some performance counters
606 void dump();
607 void dump_bci(int bci);
608 #endif
609 };
610
611 // Specialized uncommon_trap of unstable_if. C2 uses next_bci of path to update the live locals of it.
612 class UnstableIfTrap {
613 CallStaticJavaNode* const _unc;
614 bool _modified; // modified locals based on next_bci()
615 int _next_bci;
616
617 public:
618 UnstableIfTrap(CallStaticJavaNode* call, Parse::Block* path): _unc(call), _modified(false) {
619 assert(_unc != NULL && Deoptimization::trap_request_reason(_unc->uncommon_trap_request()) == Deoptimization::Reason_unstable_if,
620 "invalid uncommon_trap call!");
621 _next_bci = path != nullptr ? path->start() : -1;
622 }
623
624 // The starting point of the pruned block, where control goes when
625 // deoptimization does happen.
626 int next_bci() const {
627 return _next_bci;
628 }
629
630 bool modified() const {
631 return _modified;
632 }
633
634 void set_modified() {
635 _modified = true;
636 }
637
638 CallStaticJavaNode* uncommon_trap() const {
639 return _unc;
640 }
641
642 inline void* operator new(size_t x) throw() {
643 Compile* C = Compile::current();
644 return C->comp_arena()->AmallocWords(x);
645 }
646 };
647
648 #endif // SHARE_OPTO_PARSE_HPP