1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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24
25 #ifndef SHARE_RUNTIME_DEOPTIMIZATION_HPP
26 #define SHARE_RUNTIME_DEOPTIMIZATION_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/frame.hpp"
30
31 class ProfileData;
32 class vframeArray;
33 class MonitorInfo;
34 class MonitorValue;
35 class ObjectValue;
36 class AutoBoxObjectValue;
37 class ScopeValue;
38 class compiledVFrame;
39 class EscapeBarrier;
40
41 template<class E> class GrowableArray;
42
43 class Deoptimization : AllStatic {
44 friend class VMStructs;
45 friend class EscapeBarrier;
46
47 public:
48 // What condition caused the deoptimization?
49 enum DeoptReason {
50 Reason_many = -1, // indicates presence of several reasons
51 Reason_none = 0, // indicates absence of a relevant deopt.
52 // Next 8 reasons are recorded per bytecode in DataLayout::trap_bits.
53 // This is more complicated for JVMCI as JVMCI may deoptimize to *some* bytecode before the
54 // bytecode that actually caused the deopt (with inlining, JVMCI may even deoptimize to a
55 // bytecode in another method):
56 // - bytecode y in method b() causes deopt
57 // - JVMCI deoptimizes to bytecode x in method a()
58 // -> the deopt reason will be recorded for method a() at bytecode x
59 Reason_null_check, // saw unexpected null or zero divisor (@bci)
60 Reason_null_assert, // saw unexpected non-null or non-zero (@bci)
61 Reason_range_check, // saw unexpected array index (@bci)
62 Reason_class_check, // saw unexpected object class (@bci)
63 Reason_array_check, // saw unexpected array class (aastore @bci)
64 Reason_intrinsic, // saw unexpected operand to intrinsic (@bci)
65 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci)
66
67 #if INCLUDE_JVMCI
68 Reason_unreached0 = Reason_null_assert,
69 Reason_type_checked_inlining = Reason_intrinsic,
70 Reason_optimized_type_check = Reason_bimorphic,
71 #endif
72
73 Reason_profile_predicate, // compiler generated predicate moved from frequent branch in a loop failed
74
75 // recorded per method
76 Reason_unloaded, // unloaded class or constant pool entry
77 Reason_uninitialized, // bad class state (uninitialized)
78 Reason_initialized, // class has been fully initialized
79 Reason_unreached, // code is not reached, compiler
80 Reason_unhandled, // arbitrary compiler limitation
81 Reason_constraint, // arbitrary runtime constraint violated
82 Reason_div0_check, // a null_check due to division by zero
83 Reason_age, // nmethod too old; tier threshold reached
84 Reason_predicate, // compiler generated predicate failed
85 Reason_loop_limit_check, // compiler generated loop limits check failed
86 Reason_speculate_class_check, // saw unexpected object class from type speculation
87 Reason_speculate_null_check, // saw unexpected null from type speculation
88 Reason_speculate_null_assert, // saw unexpected null from type speculation
89 Reason_rtm_state_change, // rtm state change detected
90 Reason_unstable_if, // a branch predicted always false was taken
91 Reason_unstable_fused_if, // fused two ifs that had each one untaken branch. One is now taken.
92 #if INCLUDE_JVMCI
93 Reason_aliasing, // optimistic assumption about aliasing failed
94 Reason_transfer_to_interpreter, // explicit transferToInterpreter()
95 Reason_not_compiled_exception_handler,
96 Reason_unresolved,
97 Reason_jsr_mismatch,
98 #endif
99
100 // Reason_tenured is counted separately, add normal counted Reasons above.
101 // Related to MethodData::_trap_hist_limit where Reason_tenured isn't included
102 Reason_tenured, // age of the code has reached the limit
103 Reason_LIMIT,
104
105 // Note: Keep this enum in sync. with _trap_reason_name.
106 Reason_RECORDED_LIMIT = Reason_profile_predicate // some are not recorded per bc
107 // Note: Reason_RECORDED_LIMIT should fit into 31 bits of
108 // DataLayout::trap_bits. This dependency is enforced indirectly
109 // via asserts, to avoid excessive direct header-to-header dependencies.
110 // See Deoptimization::trap_state_reason and class DataLayout.
111 };
112
113 // What action must be taken by the runtime?
114 enum DeoptAction {
115 Action_none, // just interpret, do not invalidate nmethod
116 Action_maybe_recompile, // recompile the nmethod; need not invalidate
117 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile
118 Action_make_not_entrant, // invalidate the nmethod, recompile (probably)
119 Action_make_not_compilable, // invalidate the nmethod and do not compile
120 Action_LIMIT
121 // Note: Keep this enum in sync. with _trap_action_name.
122 };
123
124 enum {
125 _action_bits = 3,
126 _reason_bits = 5,
127 _debug_id_bits = 23,
128 _action_shift = 0,
129 _reason_shift = _action_shift+_action_bits,
130 _debug_id_shift = _reason_shift+_reason_bits,
131 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist
132 };
133
134 enum UnpackType {
135 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack
136 Unpack_exception = 1, // exception is pending
137 Unpack_uncommon_trap = 2, // redo last byte code (C2 only)
138 Unpack_reexecute = 3, // reexecute bytecode (C1 only)
139 Unpack_none = 4, // not deoptimizing the frame, just reallocating/relocking for JVMTI
140 Unpack_LIMIT = 5
141 };
142
143 #if INCLUDE_JVMCI
144 // Can reconstruct virtualized unsafe large accesses to byte arrays.
145 static const int _support_large_access_byte_array_virtualization = 1;
146 #endif
147
148 // Make all nmethods that are marked_for_deoptimization not_entrant and deoptimize any live
149 // activations using those nmethods. If an nmethod is passed as an argument then it is
150 // marked_for_deoptimization and made not_entrant. Otherwise a scan of the code cache is done to
151 // find all marked nmethods and they are made not_entrant.
152 static void deoptimize_all_marked(nmethod* nmethod_only = NULL);
153
154 private:
155 // Revoke biased locks at deopt.
156 static void revoke_from_deopt_handler(JavaThread* thread, frame fr, RegisterMap* map);
157
158 static void revoke_for_object_deoptimization(JavaThread* deoptee_thread, frame fr, RegisterMap* map, JavaThread* thread);
159
160 public:
161 // Deoptimizes a frame lazily. Deopt happens on return to the frame.
162 static void deoptimize(JavaThread* thread, frame fr, DeoptReason reason = Reason_constraint);
163
164 #if INCLUDE_JVMCI
165 static address deoptimize_for_missing_exception_handler(CompiledMethod* cm);
166 static oop get_cached_box(AutoBoxObjectValue* bv, frame* fr, RegisterMap* reg_map, TRAPS);
167 #endif
168
169 private:
170 // Does the actual work for deoptimizing a single frame
171 static void deoptimize_single_frame(JavaThread* thread, frame fr, DeoptReason reason);
172
173 #if COMPILER2_OR_JVMCI
174 // Deoptimize objects, that is reallocate and relock them, just before they escape through JVMTI.
175 // The given vframes cover one physical frame.
176 static bool deoptimize_objects_internal(JavaThread* thread, GrowableArray<compiledVFrame*>* chunk, bool& realloc_failures);
177
178 public:
179
180 // Support for restoring non-escaping objects
181 static bool realloc_objects(JavaThread* thread, frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, TRAPS);
182 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type);
183 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj);
184 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, bool realloc_failures, bool skip_internal);
185 static bool relock_objects(JavaThread* thread, GrowableArray<MonitorInfo*>* monitors,
186 JavaThread* deoptee_thread, frame& fr, int exec_mode, bool realloc_failures);
187 static void pop_frames_failed_reallocs(JavaThread* thread, vframeArray* array);
188 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects, bool realloc_failures);)
189 #endif // COMPILER2_OR_JVMCI
190
191 public:
192 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk, bool realloc_failures);
193
194 // Interface used for unpacking deoptimized frames
195
196 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob).
197 // This is only a CheapObj to ease debugging after a deopt failure
198 class UnrollBlock : public CHeapObj<mtCompiler> {
199 friend class VMStructs;
200 friend class JVMCIVMStructs;
201 private:
202 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame
203 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame
204 int _number_of_frames; // Number frames to unroll
205 int _total_frame_sizes; // Total of number*sizes frames
206 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack
207 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack
208 intptr_t* _register_block; // Block for storing callee-saved registers.
209 BasicType _return_type; // Tells if we have to restore double or long return value
210 intptr_t _initial_info; // Platform dependent data for the sender frame (was FP on x86)
211 int _caller_actual_parameters; // The number of actual arguments at the
212 // interpreted caller of the deoptimized frame
213 int _unpack_kind; // exec_mode that can be changed during fetch_unroll_info
214
215 // The following fields are used as temps during the unpacking phase
216 // (which is tight on registers, especially on x86). They really ought
217 // to be PD variables but that involves moving this class into its own
218 // file to use the pd include mechanism. Maybe in a later cleanup ...
219 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp)
220 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp)
221 public:
222 // Constructor
223 UnrollBlock(int size_of_deoptimized_frame,
224 int caller_adjustment,
225 int caller_actual_parameters,
226 int number_of_frames,
227 intptr_t* frame_sizes,
228 address* frames_pcs,
229 BasicType return_type,
230 int unpack_kind);
231 ~UnrollBlock();
232
233 // Returns where a register is located.
234 intptr_t* value_addr_at(int register_number) const;
235
236 // Accessors
237 intptr_t* frame_sizes() const { return _frame_sizes; }
238 int number_of_frames() const { return _number_of_frames; }
239 address* frame_pcs() const { return _frame_pcs ; }
240 int unpack_kind() const { return _unpack_kind; }
241
242 // Returns the total size of frames
243 int size_of_frames() const;
244
245 void set_initial_info(intptr_t info) { _initial_info = info; }
246
247 int caller_actual_parameters() const { return _caller_actual_parameters; }
248
249 // Accessors used by the code generator for the unpack stub.
250 static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); }
251 static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); }
252 static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); }
253 static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); }
254 static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); }
255 static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); }
256 static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); }
257 static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); }
258 static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); }
259 static int initial_info_offset_in_bytes() { return offset_of(UnrollBlock, _initial_info); }
260 static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); }
261 static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); }
262
263 BasicType return_type() const { return _return_type; }
264 void print();
265 };
266
267 //** Returns an UnrollBlock continuing information
268 // how to make room for the resulting interpreter frames.
269 // Called by assembly stub after execution has returned to
270 // deoptimized frame.
271 // @argument thread. Thread where stub_frame resides.
272 // @see OptoRuntime::deoptimization_fetch_unroll_info_C
273 static UnrollBlock* fetch_unroll_info(JavaThread* thread, int exec_mode);
274
275 //** Unpacks vframeArray onto execution stack
276 // Called by assembly stub after execution has returned to
277 // deoptimized frame and after the stack unrolling.
278 // @argument thread. Thread where stub_frame resides.
279 // @argument exec_mode. Determines how execution should be continued in top frame.
280 // 0 means continue after current byte code
281 // 1 means exception has happened, handle exception
282 // 2 means reexecute current bytecode (for uncommon traps).
283 // @see OptoRuntime::deoptimization_unpack_frames_C
284 // Return BasicType of call return type, if any
285 static BasicType unpack_frames(JavaThread* thread, int exec_mode);
286
287 // Cleans up deoptimization bits on thread after unpacking or in the
288 // case of an exception.
289 static void cleanup_deopt_info(JavaThread *thread,
290 vframeArray * array);
291
292 // Restores callee saved values from deoptimized frame into oldest interpreter frame
293 // so caller of the deoptimized frame will get back the values it expects.
294 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array);
295
296 //** Performs an uncommon trap for compiled code.
297 // The top most compiler frame is converted into interpreter frames
298 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index, jint exec_mode);
299 // Helper routine that enters the VM and may block
300 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index);
301
302 //** Deoptimizes the frame identified by id.
303 // Only called from VMDeoptimizeFrame
304 // @argument thread. Thread where stub_frame resides.
305 // @argument id. id of frame that should be deoptimized.
306 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id, DeoptReason reason);
307
308 // if thread is not the current thread then execute
309 // VM_DeoptimizeFrame otherwise deoptimize directly.
310 static void deoptimize_frame(JavaThread* thread, intptr_t* id, DeoptReason reason);
311 static void deoptimize_frame(JavaThread* thread, intptr_t* id);
312
313 // Statistics
314 static void gather_statistics(DeoptReason reason, DeoptAction action,
315 Bytecodes::Code bc = Bytecodes::_illegal);
316 static void print_statistics();
317
318 // How much room to adjust the last frame's SP by, to make space for
319 // the callee's interpreter frame (which expects locals to be next to
320 // incoming arguments)
321 static int last_frame_adjust(int callee_parameters, int callee_locals);
322
323 // trap_request codes
324 static DeoptReason trap_request_reason(int trap_request) {
325 if (trap_request < 0)
326 return (DeoptReason)
327 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits));
328 else
329 // standard reason for unloaded CP entry
330 return Reason_unloaded;
331 }
332 static DeoptAction trap_request_action(int trap_request) {
333 if (trap_request < 0)
334 return (DeoptAction)
335 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits));
336 else
337 // standard action for unloaded CP entry
338 return _unloaded_action;
339 }
340 static int trap_request_debug_id(int trap_request) {
341 if (trap_request < 0) {
342 return ((~(trap_request) >> _debug_id_shift) & right_n_bits(_debug_id_bits));
343 } else {
344 // standard action for unloaded CP entry
345 return 0;
346 }
347 }
348 static int trap_request_index(int trap_request) {
349 if (trap_request < 0)
350 return -1;
351 else
352 return trap_request;
353 }
354 static int make_trap_request(DeoptReason reason, DeoptAction action,
355 int index = -1) {
356 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits");
357 assert((1 << _action_bits) >= Action_LIMIT, "enough bits");
358 int trap_request;
359 if (index != -1)
360 trap_request = index;
361 else
362 trap_request = (~(((reason) << _reason_shift)
363 + ((action) << _action_shift)));
364 assert(reason == trap_request_reason(trap_request), "valid reason");
365 assert(action == trap_request_action(trap_request), "valid action");
366 assert(index == trap_request_index(trap_request), "valid index");
367 return trap_request;
368 }
369
370 // The trap_state stored in a MDO is decoded here.
371 // It records two items of information.
372 // reason: If a deoptimization happened here, what its reason was,
373 // or if there were multiple deopts with differing reasons.
374 // recompiled: If a deoptimization here triggered a recompilation.
375 // Note that not all reasons are recorded per-bci.
376 static DeoptReason trap_state_reason(int trap_state);
377 static int trap_state_has_reason(int trap_state, int reason);
378 static int trap_state_add_reason(int trap_state, int reason);
379 static bool trap_state_is_recompiled(int trap_state);
380 static int trap_state_set_recompiled(int trap_state, bool z);
381 static const char* format_trap_state(char* buf, size_t buflen,
382 int trap_state);
383
384 static bool reason_is_recorded_per_bytecode(DeoptReason reason) {
385 return reason > Reason_none && reason <= Reason_RECORDED_LIMIT;
386 }
387
388 static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) {
389 if (reason_is_recorded_per_bytecode(reason))
390 return reason;
391 else if (reason == Reason_div0_check) // null check due to divide-by-zero?
392 return Reason_null_check; // recorded per BCI as a null check
393 else if (reason == Reason_speculate_class_check)
394 return Reason_class_check;
395 else if (reason == Reason_speculate_null_check)
396 return Reason_null_check;
397 else if (reason == Reason_speculate_null_assert)
398 return Reason_null_assert;
399 else if (reason == Reason_unstable_if)
400 return Reason_intrinsic;
401 else if (reason == Reason_unstable_fused_if)
402 return Reason_range_check;
403 else
404 return Reason_none;
405 }
406
407 static bool reason_is_speculate(int reason) {
408 if (reason == Reason_speculate_class_check ||
409 reason == Reason_speculate_null_check ||
410 reason == Reason_speculate_null_assert) {
411 return true;
412 }
413 return false;
414 }
415
416 static DeoptReason reason_null_check(bool speculative) {
417 return speculative ? Deoptimization::Reason_speculate_null_check : Deoptimization::Reason_null_check;
418 }
419
420 static DeoptReason reason_class_check(bool speculative) {
421 return speculative ? Deoptimization::Reason_speculate_class_check : Deoptimization::Reason_class_check;
422 }
423
424 static DeoptReason reason_null_assert(bool speculative) {
425 return speculative ? Deoptimization::Reason_speculate_null_assert : Deoptimization::Reason_null_assert;
426 }
427
428 static uint per_method_trap_limit(int reason) {
429 return reason_is_speculate(reason) ? (uint)PerMethodSpecTrapLimit : (uint)PerMethodTrapLimit;
430 }
431
432 static const char* trap_reason_name(int reason);
433 static const char* trap_action_name(int action);
434 // Format like reason='foo' action='bar' index='123'.
435 // This is suitable both for XML and for tty output.
436 static const char* format_trap_request(char* buf, size_t buflen,
437 int trap_request);
438
439 static jint total_deoptimization_count();
440
441 // JVMTI PopFrame support
442
443 // Preserves incoming arguments to the popped frame when it is
444 // returning to a deoptimized caller
445 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address);
446
447 static MethodData* get_method_data(JavaThread* thread, const methodHandle& m, bool create_if_missing);
448 private:
449 // Update the mdo's count and per-BCI reason bits, returning previous state:
450 static ProfileData* query_update_method_data(MethodData* trap_mdo,
451 int trap_bci,
452 DeoptReason reason,
453 bool update_total_trap_count,
454 #if INCLUDE_JVMCI
455 bool is_osr,
456 #endif
457 Method* compiled_method,
458 //outputs:
459 uint& ret_this_trap_count,
460 bool& ret_maybe_prior_trap,
461 bool& ret_maybe_prior_recompile);
462 // class loading support for uncommon trap
463 static void load_class_by_index(const constantPoolHandle& constant_pool, int index, TRAPS);
464 static void load_class_by_index(const constantPoolHandle& constant_pool, int index);
465
466 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread, int exec_mode);
467
468 static DeoptAction _unloaded_action; // == Action_reinterpret;
469 static const char* _trap_reason_name[];
470 static const char* _trap_action_name[];
471
472 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT];
473 // Note: Histogram array size is 1-2 Kb.
474
475 public:
476 static void update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason);
477 };
478
479 // EscapeBarriers should be put on execution paths, where JVMTI agents can access object
480 // references held by java threads.
481 // They provide means to revert optimizations based on escape analysis in a well synchronized manner
482 // just before local references escape through JVMTI.
483 class EscapeBarrier : StackObj {
484 #if COMPILER2_OR_JVMCI
485 JavaThread* const _calling_thread;
486 JavaThread* const _deoptee_thread;
487 bool const _barrier_active;
488
489 static bool _deoptimizing_objects_for_all_threads;
490 static bool _self_deoptimization_in_progress;
491
492 void sync_and_suspend_one();
493 void sync_and_suspend_all();
494 void resume_one();
495 void resume_all();
496
497 // Deoptimize the given frame and deoptimize objects with optimizations based on escape analysis.
498 bool deoptimize_objects_internal(JavaThread* deoptee, intptr_t* fr_id);
499
500 public:
501 // Revert ea based optimizations for given deoptee thread
502 EscapeBarrier(JavaThread* calling_thread, JavaThread* deoptee_thread, bool barrier_active)
503 : _calling_thread(calling_thread), _deoptee_thread(deoptee_thread),
504 _barrier_active(barrier_active && (JVMCI_ONLY(UseJVMCICompiler) NOT_JVMCI(false)
505 COMPILER2_PRESENT(|| DoEscapeAnalysis)))
506 {
507 if (_barrier_active) sync_and_suspend_one();
508 }
509
510 // Revert ea based optimizations for all java threads
511 EscapeBarrier(JavaThread* calling_thread, bool barrier_active)
512 : _calling_thread(calling_thread), _deoptee_thread(NULL),
513 _barrier_active(barrier_active && (JVMCI_ONLY(UseJVMCICompiler) NOT_JVMCI(false)
514 COMPILER2_PRESENT(|| DoEscapeAnalysis)))
515 {
516 if (_barrier_active) sync_and_suspend_all();
517 }
518 #else
519 public:
520 EscapeBarrier(JavaThread* calling_thread, JavaThread* deoptee_thread, bool barrier_active) { }
521 EscapeBarrier(JavaThread* calling_thread, bool barrier_active) { }
522 static bool deoptimizing_objects_for_all_threads() { return false; }
523 #endif // COMPILER2_OR_JVMCI
524
525 // Deoptimize objects, i.e. reallocate and relock them. The target frames are deoptimized.
526 // The methods return false iff at least one reallocation failed.
527 bool deoptimize_objects(intptr_t* fr_id) {
528 return true COMPILER2_OR_JVMCI_PRESENT(&& deoptimize_objects_internal(deoptee_thread(), fr_id));
529 }
530 bool deoptimize_objects(int depth) NOT_COMPILER2_OR_JVMCI_RETURN_(true);
531 // Find and deoptimize non escaping objects and the holding frames on all stacks.
532 bool deoptimize_objects_all_threads() NOT_COMPILER2_OR_JVMCI_RETURN_(true);
533
534 // A java thread was added to the list of threads
535 static void thread_added(JavaThread* jt) NOT_COMPILER2_OR_JVMCI_RETURN;
536 // A java thread was removed from the list of threads
537 static void thread_removed(JavaThread* jt) NOT_COMPILER2_OR_JVMCI_RETURN;
538
539 #if COMPILER2_OR_JVMCI
540 // Returns true iff objects were reallocated and relocked because of access through JVMTI
541 static bool objs_are_deoptimized(JavaThread* thread, intptr_t* fr_id);
542
543 static bool deoptimizing_objects_for_all_threads() { return _deoptimizing_objects_for_all_threads; }
544
545 ~EscapeBarrier() {
546 if (!barrier_active()) return;
547 if (all_threads()) {
548 resume_all();
549 } else {
550 resume_one();
551 }
552 }
553
554
555 bool all_threads() const { return _deoptee_thread == NULL; } // Should revert optimizations for all threads.
556 bool self_deopt() const { return _calling_thread == _deoptee_thread; } // Current thread deoptimizes its own objects.
557 bool barrier_active() const { return _barrier_active; } // Inactive barriers are created if no local objects can escape.
558
559 // accessors
560 JavaThread* calling_thread() const { return _calling_thread; }
561 JavaThread* deoptee_thread() const { return _deoptee_thread; }
562 #endif // COMPILER2_OR_JVMCI
563 };
564
565 class DeoptimizationMarker : StackObj { // for profiling
566 static bool _is_active;
567 public:
568 DeoptimizationMarker() { _is_active = true; }
569 ~DeoptimizationMarker() { _is_active = false; }
570 static bool is_active() { return _is_active; }
571 };
572
573 #endif // SHARE_RUNTIME_DEOPTIMIZATION_HPP