1 /*
2 * Copyright (c) 1997, 2025, 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 JVMState* caller_jvms,
79 bool& should_delay,
80 ciCallProfile& profile);
81 bool should_not_inline(ciMethod* callee_method,
82 ciMethod* caller_method,
83 int caller_bci,
84 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, JVMState* jvm, bool success) const;
91
92 InlineTree* caller_tree() const { return _caller_tree; }
93 InlineTree* callee_at(int bci, ciMethod* m) const;
94 int stack_depth() const { return _caller_jvms ? _caller_jvms->depth() : 0; }
95 const char* msg() const { return _msg; }
96 void set_msg(const char* msg) { _msg = msg; }
97 public:
98 static const char* check_can_parse(ciMethod* callee);
99
100 static InlineTree* build_inline_tree_root();
101 static InlineTree* find_subtree_from_root(InlineTree* root, JVMState* jvms, ciMethod* callee);
102
103 // See if it is OK to inline.
104 // The receiver is the inline tree for the caller.
105 //
106 // The result is a temperature indication. If it is hot or cold,
107 // inlining is immediate or undesirable. Otherwise, the info block
108 // returned is newly allocated and may be enqueued.
109 //
110 // If the method is inlinable, a new inline subtree is created on the fly,
111 // and may be accessed by find_subtree_from_root.
112 // The call_method is the dest_method for a special or static invocation.
113 // The call_method is an optimized virtual method candidate otherwise.
114 bool ok_to_inline(ciMethod *call_method, JVMState* caller_jvms, ciCallProfile& profile, bool& should_delay);
115
116 void set_late_inline() {
117 _late_inline = true;
118 }
119
120 // Information about inlined method
121 JVMState* caller_jvms() const { return _caller_jvms; }
122 ciMethod *method() const { return _method; }
123 int caller_bci() const { return _caller_jvms ? _caller_jvms->bci() : InvocationEntryBci; }
124 uint count_inline_bcs() const { return _count_inline_bcs; }
125 int inline_level() const { return stack_depth(); }
126
127 #ifndef PRODUCT
128 private:
129 uint _count_inlines; // Count of inlined methods
130 public:
131 // Debug information collected during parse
132 uint count_inlines() const { return _count_inlines; };
133 #endif
134 GrowableArray<InlineTree*> subtrees() { return _subtrees; }
135
136 void print_value_on(outputStream* st) const PRODUCT_RETURN;
137
138 bool _forced_inline; // Inlining was forced by CompilerOracle, ciReplay or annotation
139 bool forced_inline() const { return _forced_inline; }
140 // Count number of nodes in this subtree
141 int count() const;
142 // Dump inlining replay data to the stream.
143 void dump_replay_data(outputStream* out, int depth_adjust = 0);
144 };
145
146
147 //-----------------------------------------------------------------------------
148 //------------------------------Parse------------------------------------------
149 // Parse bytecodes, build a Graph
150 class Parse : public GraphKit {
151 public:
152 // Per-block information needed by the parser:
153 class Block {
154 private:
155 ciTypeFlow::Block* _flow;
156 int _pred_count; // how many predecessors in CFG?
157 int _preds_parsed; // how many of these have been parsed?
158 uint _count; // how many times executed? Currently only set by _goto's
159 bool _is_parsed; // has this block been parsed yet?
160 bool _is_handler; // is this block an exception handler?
161 bool _has_merged_backedge; // does this block have merged backedge?
162 SafePointNode* _start_map; // all values flowing into this block
163 MethodLivenessResult _live_locals; // lazily initialized liveness bitmap
164 bool _has_predicates; // Were predicates added before parsing of the loop head?
165
166 int _num_successors; // Includes only normal control flow.
167 int _all_successors; // Include exception paths also.
168 Block** _successors;
169
170 public:
171
172 // Set up the block data structure itself.
173 Block(Parse* outer, int rpo);
174
175 // Set up the block's relations to other blocks.
176 void init_graph(Parse* outer);
177
178 ciTypeFlow::Block* flow() const { return _flow; }
179 int pred_count() const { return _pred_count; }
180 int preds_parsed() const { return _preds_parsed; }
181 bool is_parsed() const { return _is_parsed; }
182 bool is_handler() const { return _is_handler; }
183 void set_count( uint x ) { _count = x; }
184 uint count() const { return _count; }
185
186 SafePointNode* start_map() const { assert(is_merged(),""); return _start_map; }
187 void set_start_map(SafePointNode* m) { assert(!is_merged(), ""); _start_map = m; }
188
189 // True after any predecessor flows control into this block
190 bool is_merged() const { return _start_map != nullptr; }
191
192 #ifdef ASSERT
193 // True after backedge predecessor flows control into this block
194 bool has_merged_backedge() const { return _has_merged_backedge; }
195 void mark_merged_backedge(Block* pred) {
196 assert(is_SEL_head(), "should be loop head");
197 if (pred != nullptr && is_SEL_backedge(pred)) {
198 assert(is_parsed(), "block should be parsed before merging backedges");
199 _has_merged_backedge = true;
200 }
201 }
202 #endif
203
204 // True when all non-exception predecessors have been parsed.
205 bool is_ready() const { return preds_parsed() == pred_count(); }
206
207 bool has_predicates() const { return _has_predicates; }
208 void set_has_predicates() { _has_predicates = true; }
209
210 int num_successors() const { return _num_successors; }
211 int all_successors() const { return _all_successors; }
212 Block* successor_at(int i) const {
213 assert((uint)i < (uint)all_successors(), "");
214 return _successors[i];
215 }
216 Block* successor_for_bci(int bci);
217
218 int start() const { return flow()->start(); }
219 int limit() const { return flow()->limit(); }
220 int rpo() const { return flow()->rpo(); }
221 int start_sp() const { return flow()->stack_size(); }
222
223 bool is_loop_head() const { return flow()->is_loop_head(); }
224 bool is_in_irreducible_loop() const {
225 return flow()->is_in_irreducible_loop();
226 }
227 bool is_irreducible_loop_entry() const {
228 return flow()->is_irreducible_loop_head() || flow()->is_irreducible_loop_secondary_entry();
229 }
230 void copy_irreducible_status_to(RegionNode* region, const JVMState* jvms) {
231 assert(!is_irreducible_loop_entry() || is_in_irreducible_loop(), "entry is part of irreducible loop");
232 if (is_in_irreducible_loop()) {
233 // The block is in an irreducible loop of this method, so it is possible that this
234 // region becomes an irreducible loop entry. (no guarantee)
235 region->set_loop_status(RegionNode::LoopStatus::MaybeIrreducibleEntry);
236 } else if (jvms->caller() != nullptr) {
237 // The block is not in an irreducible loop of this method, hence it cannot ever
238 // be the entry of an irreducible loop. But it may be inside an irreducible loop
239 // of a caller of this inlined method. (limited guarantee)
240 assert(region->loop_status() == RegionNode::LoopStatus::NeverIrreducibleEntry, "status not changed");
241 } else {
242 // The block is not in an irreducible loop of this method, and there is no outer
243 // method. This region will never be in an irreducible loop (strong guarantee)
244 region->set_loop_status(RegionNode::LoopStatus::Reducible);
245 }
246 }
247 bool is_SEL_head() const { return flow()->is_single_entry_loop_head(); }
248 bool is_SEL_backedge(Block* pred) const{ return is_SEL_head() && pred->rpo() >= rpo(); }
249 bool is_invariant_local(uint i) const {
250 const JVMState* jvms = start_map()->jvms();
251 if (!jvms->is_loc(i) || flow()->outer()->has_irreducible_entry()) return false;
252 return flow()->is_invariant_local(i - jvms->locoff());
253 }
254 bool can_elide_SEL_phi(uint i) const { assert(is_SEL_head(),""); return is_invariant_local(i); }
255
256 const Type* peek(int off=0) const { return stack_type_at(start_sp() - (off+1)); }
257
258 const Type* stack_type_at(int i) const;
259 const Type* local_type_at(int i) const;
260 static const Type* get_type(ciType* t) { return Type::get_typeflow_type(t); }
261
262 bool has_trap_at(int bci) const { return flow()->has_trap() && flow()->trap_bci() == bci; }
263
264 // Call this just before parsing a block.
265 void mark_parsed() {
266 assert(!_is_parsed, "must parse each block exactly once");
267 _is_parsed = true;
268 }
269
270 // Return the phi/region input index for the "current" pred,
271 // and bump the pred number. For historical reasons these index
272 // numbers are handed out in descending order. The last index is
273 // always PhiNode::Input (i.e., 1). The value returned is known
274 // as a "path number" because it distinguishes by which path we are
275 // entering the block.
276 int next_path_num() {
277 assert(preds_parsed() < pred_count(), "too many preds?");
278 return pred_count() - _preds_parsed++;
279 }
280
281 // Add a previously unaccounted predecessor to this block.
282 // This operates by increasing the size of the block's region
283 // and all its phi nodes (if any). The value returned is a
284 // path number ("pnum").
285 int add_new_path();
286
287 // Initialize me by recording the parser's map. My own map must be null.
288 void record_state(Parse* outer);
289 };
290
291 #ifndef PRODUCT
292 // BytecodeParseHistogram collects number of bytecodes parsed, nodes constructed, and transformations.
293 class BytecodeParseHistogram : public ArenaObj {
294 private:
295 enum BPHType {
296 BPH_transforms,
297 BPH_values
298 };
299 static bool _initialized;
300 static uint _bytecodes_parsed [Bytecodes::number_of_codes];
301 static uint _nodes_constructed[Bytecodes::number_of_codes];
302 static uint _nodes_transformed[Bytecodes::number_of_codes];
303 static uint _new_values [Bytecodes::number_of_codes];
304
305 Bytecodes::Code _initial_bytecode;
306 int _initial_node_count;
307 int _initial_transforms;
308 int _initial_values;
309
310 Parse *_parser;
311 Compile *_compiler;
312
313 // Initialization
314 static void reset();
315
316 // Return info being collected, select with global flag 'BytecodeParseInfo'
317 int current_count(BPHType info_selector);
318
319 public:
320 BytecodeParseHistogram(Parse *p, Compile *c);
321 static bool initialized();
322
323 // Record info when starting to parse one bytecode
324 void set_initial_state( Bytecodes::Code bc );
325 // Record results of parsing one bytecode
326 void record_change();
327
328 // Profile printing
329 static void print(float cutoff = 0.01F); // cutoff in percent
330 };
331
332 public:
333 // Record work done during parsing
334 BytecodeParseHistogram* _parse_histogram;
335 void set_parse_histogram(BytecodeParseHistogram *bph) { _parse_histogram = bph; }
336 BytecodeParseHistogram* parse_histogram() { return _parse_histogram; }
337 #endif
338
339 private:
340 friend class Block;
341
342 // Variables which characterize this compilation as a whole:
343
344 JVMState* _caller; // JVMS which carries incoming args & state.
345 float _expected_uses; // expected number of calls to this code
346 float _prof_factor; // discount applied to my profile counts
347 int _depth; // Inline tree depth, for debug printouts
348 const TypeFunc*_tf; // My kind of function type
349 int _entry_bci; // the osr bci or InvocationEntryBci
350
351 ciTypeFlow* _flow; // Results of previous flow pass.
352 Block* _blocks; // Array of basic-block structs.
353 int _block_count; // Number of elements in _blocks.
354
355 GraphKit _exits; // Record all normal returns and throws here.
356 bool _wrote_final; // Did we write a final field?
357 bool _wrote_volatile; // Did we write a volatile field?
358 bool _wrote_stable; // Did we write a @Stable field?
359 bool _wrote_fields; // Did we write any field?
360 Node* _alloc_with_final_or_stable; // An allocation node with final or @Stable field
361
362 // Variables which track Java semantics during bytecode parsing:
363
364 Block* _block; // block currently getting parsed
365 ciBytecodeStream _iter; // stream of this method's bytecodes
366
367 const FastLockNode* _synch_lock; // FastLockNode for synchronized method
368
369 #ifndef PRODUCT
370 int _max_switch_depth; // Debugging SwitchRanges.
371 int _est_switch_depth; // Debugging SwitchRanges.
372 #endif
373
374 bool _first_return; // true if return is the first to be parsed
375 bool _replaced_nodes_for_exceptions; // needs processing of replaced nodes in exception paths?
376 uint _new_idx; // any node with _idx above were new during this parsing. Used to trim the replaced nodes list.
377
378 public:
379 // Constructor
380 Parse(JVMState* caller, ciMethod* parse_method, float expected_uses);
381
382 virtual Parse* is_Parse() const { return (Parse*)this; }
383
384 // Accessors.
385 JVMState* caller() const { return _caller; }
386 float expected_uses() const { return _expected_uses; }
387 float prof_factor() const { return _prof_factor; }
388 int depth() const { return _depth; }
389 const TypeFunc* tf() const { return _tf; }
390 // entry_bci() -- see osr_bci, etc.
391
392 ciTypeFlow* flow() const { return _flow; }
393 // blocks() -- see rpo_at, start_block, etc.
394 int block_count() const { return _block_count; }
395
396 GraphKit& exits() { return _exits; }
397 bool wrote_final() const { return _wrote_final; }
398 void set_wrote_final(bool z) { _wrote_final = z; }
399 bool wrote_volatile() const { return _wrote_volatile; }
400 void set_wrote_volatile(bool z) { _wrote_volatile = z; }
401 bool wrote_stable() const { return _wrote_stable; }
402 void set_wrote_stable(bool z) { _wrote_stable = z; }
403 bool wrote_fields() const { return _wrote_fields; }
404 void set_wrote_fields(bool z) { _wrote_fields = z; }
405 Node* alloc_with_final_or_stable() const { return _alloc_with_final_or_stable; }
406 void set_alloc_with_final_or_stable(Node* n) {
407 assert((_alloc_with_final_or_stable == nullptr) || (_alloc_with_final_or_stable == n), "different init objects?");
408 _alloc_with_final_or_stable = n;
409 }
410
411 Block* block() const { return _block; }
412 ciBytecodeStream& iter() { return _iter; }
413 Bytecodes::Code bc() const { return _iter.cur_bc(); }
414
415 void set_block(Block* b) { _block = b; }
416
417 // Derived accessors:
418 bool is_osr_parse() const {
419 assert(_entry_bci != UnknownBci, "uninitialized _entry_bci");
420 return _entry_bci != InvocationEntryBci;
421 }
422 bool is_normal_parse() const { return !is_osr_parse(); }
423 int osr_bci() const { assert(is_osr_parse(),""); return _entry_bci; }
424
425 void set_parse_bci(int bci);
426
427 // Must this parse be aborted?
428 bool failing() const { return C->failing_internal(); } // might have cascading effects, not stressing bailouts for now.
429
430 Block* rpo_at(int rpo) {
431 assert(0 <= rpo && rpo < _block_count, "oob");
432 return &_blocks[rpo];
433 }
434 Block* start_block() {
435 return rpo_at(flow()->start_block()->rpo());
436 }
437 // Can return null if the flow pass did not complete a block.
438 Block* successor_for_bci(int bci) {
439 return block()->successor_for_bci(bci);
440 }
441
442 private:
443 // Create a JVMS & map for the initial state of this method.
444 SafePointNode* create_entry_map();
445
446 // OSR helpers
447 Node *fetch_interpreter_state(int index, BasicType bt, Node *local_addrs, Node *local_addrs_base);
448 Node* check_interpreter_type(Node* l, const Type* type, SafePointNode* &bad_type_exit);
449 void load_interpreter_state(Node* osr_buf);
450
451 // Functions for managing basic blocks:
452 void init_blocks();
453 void load_state_from(Block* b);
454 void store_state_to(Block* b) { b->record_state(this); }
455
456 // Parse all the basic blocks.
457 void do_all_blocks();
458
459 // Parse the current basic block
460 void do_one_block();
461
462 // Raise an error if we get a bad ciTypeFlow CFG.
463 void handle_missing_successor(int bci);
464
465 // first actions (before BCI 0)
466 void do_method_entry();
467
468 // implementation of monitorenter/monitorexit
469 void do_monitor_enter();
470 void do_monitor_exit();
471
472 // Eagerly create phie throughout the state, to cope with back edges.
473 void ensure_phis_everywhere();
474
475 // Merge the current mapping into the basic block starting at bci
476 void merge( int target_bci);
477 // Same as plain merge, except that it allocates a new path number.
478 void merge_new_path( int target_bci);
479 // Merge the current mapping into an exception handler.
480 void merge_exception(int target_bci);
481 // Helper: Merge the current mapping into the given basic block
482 void merge_common(Block* target, int pnum);
483 // Helper functions for merging individual cells.
484 PhiNode *ensure_phi( int idx, bool nocreate = false);
485 PhiNode *ensure_memory_phi(int idx, bool nocreate = false);
486 // Helper to merge the current memory state into the given basic block
487 void merge_memory_edges(MergeMemNode* n, int pnum, bool nophi);
488
489 // Parse this bytecode, and alter the Parsers JVM->Node mapping
490 void do_one_bytecode();
491
492 // helper function to generate array store check
493 void array_store_check();
494 // Helper function to generate array load
495 void array_load(BasicType etype);
496 // Helper function to generate array store
497 void array_store(BasicType etype);
498 // Helper function to compute array addressing
499 Node* array_addressing(BasicType type, int vals, const Type*& elemtype);
500
501 void clinit_deopt();
502
503 // Pass current map to exits
504 void return_current(Node* value);
505
506 // Register finalizers on return from Object.<init>
507 void call_register_finalizer();
508
509 // Insert a compiler safepoint into the graph
510 void add_safepoint();
511
512 // Insert a compiler safepoint into the graph, if there is a back-branch.
513 void maybe_add_safepoint(int target_bci) {
514 if (target_bci <= bci()) {
515 add_safepoint();
516 }
517 }
518
519 // Note: Intrinsic generation routines may be found in library_call.cpp.
520
521 // Helper function to setup Ideal Call nodes
522 void do_call();
523
524 // Helper function to uncommon-trap or bailout for non-compilable call-sites
525 bool can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass *klass);
526
527 // Helper functions for type checking bytecodes:
528 void do_checkcast();
529 void do_instanceof();
530
531 // Helper functions for shifting & arithmetic
532 Node* floating_point_mod(Node* a, Node* b, BasicType type);
533 void l2f();
534
535 // implementation of _get* and _put* bytecodes
536 void do_getstatic() { do_field_access(true, false); }
537 void do_getfield () { do_field_access(true, true); }
538 void do_putstatic() { do_field_access(false, false); }
539 void do_putfield () { do_field_access(false, true); }
540
541 // common code for making initial checks and forming addresses
542 void do_field_access(bool is_get, bool is_field);
543
544 // common code for actually performing the load or store
545 void do_get_xxx(Node* obj, ciField* field, bool is_field);
546 void do_put_xxx(Node* obj, ciField* field, bool is_field);
547
548 // implementation of object creation bytecodes
549 void do_new();
550 void do_newarray(BasicType elemtype);
551 void do_anewarray();
552 void do_multianewarray();
553 Node* expand_multianewarray(ciArrayKlass* array_klass, Node* *lengths, int ndimensions, int nargs);
554
555 // implementation of jsr/ret
556 void do_jsr();
557 void do_ret();
558
559 float dynamic_branch_prediction(float &cnt, BoolTest::mask btest, Node* test);
560 float branch_prediction(float &cnt, BoolTest::mask btest, int target_bci, Node* test);
561 bool seems_never_taken(float prob) const;
562 bool path_is_suitable_for_uncommon_trap(float prob) const;
563
564 void do_ifnull(BoolTest::mask btest, Node* c);
565 void do_if(BoolTest::mask btest, Node* c);
566 int repush_if_args();
567 void adjust_map_after_if(BoolTest::mask btest, Node* c, float prob, Block* path);
568 void sharpen_type_after_if(BoolTest::mask btest,
569 Node* con, const Type* tcon,
570 Node* val, const Type* tval);
571 void maybe_add_predicate_after_if(Block* path);
572 IfNode* jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask, float prob, float cnt);
573 void jump_if_true_fork(IfNode *ifNode, int dest_bci_if_true, bool unc);
574 void jump_if_false_fork(IfNode *ifNode, int dest_bci_if_false, bool unc);
575 void jump_if_always_fork(int dest_bci_if_true, bool unc);
576
577 friend class SwitchRange;
578 void do_tableswitch();
579 void do_lookupswitch();
580 void jump_switch_ranges(Node* a, SwitchRange* lo, SwitchRange* hi, int depth = 0);
581 bool create_jump_tables(Node* a, SwitchRange* lo, SwitchRange* hi);
582 void linear_search_switch_ranges(Node* key_val, SwitchRange*& lo, SwitchRange*& hi);
583
584 // helper function for call statistics
585 void count_compiled_calls(bool at_method_entry, bool is_inline) PRODUCT_RETURN;
586
587 Node_Notes* make_node_notes(Node_Notes* caller_nn);
588
589 // Helper functions for handling normal and abnormal exits.
590 void build_exits();
591
592 // Fix up all exceptional control flow exiting a single bytecode.
593 void do_exceptions();
594
595 // Fix up all exiting control flow at the end of the parse.
596 void do_exits();
597
598 // Add Catch/CatchProjs
599 // The call is either a Java call or the VM's rethrow stub
600 void catch_call_exceptions(ciExceptionHandlerStream&);
601
602 // Handle all exceptions thrown by the inlined method.
603 // Also handles exceptions for individual bytecodes.
604 void catch_inline_exceptions(SafePointNode* ex_map);
605
606 // Merge the given map into correct exceptional exit state.
607 // Assumes that there is no applicable local handler.
608 void throw_to_exit(SafePointNode* ex_map);
609
610 // Use speculative type to optimize CmpP node
611 Node* optimize_cmp_with_klass(Node* c);
612
613 // Stress unstable if traps
614 void stress_trap(IfNode* orig_iff, Node* counter, Node* incr_store);
615 // Increment counter used by StressUnstableIfTraps
616 void increment_trap_stress_counter(Node*& counter, Node*& incr_store);
617
618 public:
619 #ifndef PRODUCT
620 // Handle PrintOpto, etc.
621 void show_parse_info();
622 void dump_map_adr_mem() const;
623 static void print_statistics(); // Print some performance counters
624 void dump();
625 void dump_bci(int bci);
626 #endif
627 };
628
629 // Specialized uncommon_trap of unstable_if. C2 uses next_bci of path to update the live locals of it.
630 class UnstableIfTrap {
631 CallStaticJavaNode* const _unc;
632 bool _modified; // modified locals based on next_bci()
633 int _next_bci;
634
635 public:
636 UnstableIfTrap(CallStaticJavaNode* call, Parse::Block* path): _unc(call), _modified(false) {
637 assert(_unc != nullptr && Deoptimization::trap_request_reason(_unc->uncommon_trap_request()) == Deoptimization::Reason_unstable_if,
638 "invalid uncommon_trap call!");
639 _next_bci = path != nullptr ? path->start() : -1;
640 }
641
642 // The starting point of the pruned block, where control goes when
643 // deoptimization does happen.
644 int next_bci() const {
645 return _next_bci;
646 }
647
648 bool modified() const {
649 return _modified;
650 }
651
652 void set_modified() {
653 _modified = true;
654 }
655
656 CallStaticJavaNode* uncommon_trap() const {
657 return _unc;
658 }
659
660 inline void* operator new(size_t x) throw() {
661 Compile* C = Compile::current();
662 return C->comp_arena()->AmallocWords(x);
663 }
664 };
665
666 #endif // SHARE_OPTO_PARSE_HPP