24 25 #ifndef SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP 26 #define SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP 27 28 #include "memory/allocation.hpp" 29 #include "runtime/frame.inline.hpp" 30 31 class ProfileData; 32 class vframeArray; 33 class MonitorValue; 34 class ObjectValue; 35 36 class Deoptimization : AllStatic { 37 friend class VMStructs; 38 39 public: 40 // What condition caused the deoptimization? 41 enum DeoptReason { 42 Reason_many = -1, // indicates presence of several reasons 43 Reason_none = 0, // indicates absence of a relevant deopt. 44 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits 45 Reason_null_check, // saw unexpected null or zero divisor (@bci) 46 Reason_null_assert, // saw unexpected non-null or non-zero (@bci) 47 Reason_range_check, // saw unexpected array index (@bci) 48 Reason_class_check, // saw unexpected object class (@bci) 49 Reason_array_check, // saw unexpected array class (aastore @bci) 50 Reason_intrinsic, // saw unexpected operand to intrinsic (@bci) 51 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci) 52 53 Reason_unloaded, // unloaded class or constant pool entry 54 Reason_uninitialized, // bad class state (uninitialized) 55 Reason_unreached, // code is not reached, compiler 56 Reason_unhandled, // arbitrary compiler limitation 57 Reason_constraint, // arbitrary runtime constraint violated 58 Reason_div0_check, // a null_check due to division by zero 59 Reason_age, // nmethod too old; tier threshold reached 60 Reason_predicate, // compiler generated predicate failed 61 Reason_loop_limit_check, // compiler generated loop limits check failed 62 Reason_speculate_class_check, // saw unexpected object class from type speculation 63 Reason_speculate_null_check, // saw unexpected null from type speculation 64 Reason_rtm_state_change, // rtm state change detected 65 Reason_unstable_if, // a branch predicted always false was taken 66 Reason_unstable_fused_if, // fused two ifs that had each one untaken branch. One is now taken. 67 68 // Reason_tenured is counted separately, add normal counted Reasons above. 69 // Related to MethodData::_trap_hist_limit where Reason_tenured isn't included 70 Reason_tenured, // age of the code has reached the limit 71 Reason_LIMIT, 72 // Note: Keep this enum in sync. with _trap_reason_name. 73 Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc 74 // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of 75 // DataLayout::trap_bits. This dependency is enforced indirectly 76 // via asserts, to avoid excessive direct header-to-header dependencies. 77 // See Deoptimization::trap_state_reason and class DataLayout. 78 }; 79 80 // What action must be taken by the runtime? 81 enum DeoptAction { 82 Action_none, // just interpret, do not invalidate nmethod 83 Action_maybe_recompile, // recompile the nmethod; need not invalidate 84 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile 85 Action_make_not_entrant, // invalidate the nmethod, recompile (probably) 86 Action_make_not_compilable, // invalidate the nmethod and do not compile 87 Action_LIMIT 88 // Note: Keep this enum in sync. with _trap_action_name. 89 }; 90 91 enum { 92 _action_bits = 3, 93 _reason_bits = 5, 94 _action_shift = 0, 95 _reason_shift = _action_shift+_action_bits, 96 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist 97 }; 98 99 enum UnpackType { 100 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack 101 Unpack_exception = 1, // exception is pending 102 Unpack_uncommon_trap = 2, // redo last byte code (C2 only) 103 Unpack_reexecute = 3 // reexecute bytecode (C1 only) 104 }; 105 106 // Checks all compiled methods. Invalid methods are deleted and 107 // corresponding activations are deoptimized. 108 static int deoptimize_dependents(); 109 110 // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame 111 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map); 112 113 private: 114 // Does the actual work for deoptimizing a single frame 115 static void deoptimize_single_frame(JavaThread* thread, frame fr); 116 117 // Helper function to revoke biases of all monitors in frame if UseBiasedLocking 118 // is enabled 119 static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map); 120 // Helper function to revoke biases of all monitors in frames 121 // executing in a particular CodeBlob if UseBiasedLocking is enabled 122 static void revoke_biases_of_monitors(CodeBlob* cb); 123 124 #ifdef COMPILER2 125 // Support for restoring non-escaping objects 126 static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS); 127 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type); 128 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj); 129 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, bool realloc_failures); 130 static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread, bool realloc_failures); 131 static void pop_frames_failed_reallocs(JavaThread* thread, vframeArray* array); 132 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects, bool realloc_failures);) 133 #endif // COMPILER2 134 135 public: 136 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk, bool realloc_failures); 137 138 // Interface used for unpacking deoptimized frames 139 140 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob). 141 // This is only a CheapObj to ease debugging after a deopt failure 142 class UnrollBlock : public CHeapObj<mtCompiler> { 143 private: 144 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame 145 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame 146 int _number_of_frames; // Number frames to unroll 147 int _total_frame_sizes; // Total of number*sizes frames 148 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack 149 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack 150 intptr_t* _register_block; // Block for storing callee-saved registers. 151 BasicType _return_type; // Tells if we have to restore double or long return value 152 intptr_t _initial_info; // Platform dependent data for the sender frame (was FP on x86) 153 int _caller_actual_parameters; // The number of actual arguments at the 154 // interpreted caller of the deoptimized frame 155 156 // The following fields are used as temps during the unpacking phase 157 // (which is tight on registers, especially on x86). They really ought 158 // to be PD variables but that involves moving this class into its own 159 // file to use the pd include mechanism. Maybe in a later cleanup ... 160 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) 161 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) 162 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) 226 227 // Cleans up deoptimization bits on thread after unpacking or in the 228 // case of an exception. 229 static void cleanup_deopt_info(JavaThread *thread, 230 vframeArray * array); 231 232 // Restores callee saved values from deoptimized frame into oldest interpreter frame 233 // so caller of the deoptimized frame will get back the values it expects. 234 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); 235 236 //** Performs an uncommon trap for compiled code. 237 // The top most compiler frame is converted into interpreter frames 238 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); 239 // Helper routine that enters the VM and may block 240 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); 241 242 //** Deoptimizes the frame identified by id. 243 // Only called from VMDeoptimizeFrame 244 // @argument thread. Thread where stub_frame resides. 245 // @argument id. id of frame that should be deoptimized. 246 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id); 247 248 // If thread is not the current thread then execute 249 // VM_DeoptimizeFrame otherwise deoptimize directly. 250 static void deoptimize_frame(JavaThread* thread, intptr_t* id); 251 252 // Statistics 253 static void gather_statistics(DeoptReason reason, DeoptAction action, 254 Bytecodes::Code bc = Bytecodes::_illegal); 255 static void print_statistics(); 256 257 // How much room to adjust the last frame's SP by, to make space for 258 // the callee's interpreter frame (which expects locals to be next to 259 // incoming arguments) 260 static int last_frame_adjust(int callee_parameters, int callee_locals); 261 262 // trap_request codes 263 static DeoptReason trap_request_reason(int trap_request) { 264 if (trap_request < 0) 265 return (DeoptReason) 266 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); 267 else 268 // standard reason for unloaded CP entry 269 return Reason_unloaded; 270 } 271 static DeoptAction trap_request_action(int trap_request) { 272 if (trap_request < 0) 273 return (DeoptAction) 274 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); 275 else 276 // standard action for unloaded CP entry 277 return _unloaded_action; 278 } 279 static int trap_request_index(int trap_request) { 280 if (trap_request < 0) 281 return -1; 282 else 283 return trap_request; 284 } 285 static int make_trap_request(DeoptReason reason, DeoptAction action, 286 int index = -1) { 287 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); 288 assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); 289 int trap_request; 290 if (index != -1) 291 trap_request = index; 292 else 293 trap_request = (~(((reason) << _reason_shift) 294 + ((action) << _action_shift))); 295 assert(reason == trap_request_reason(trap_request), "valid reason"); 296 assert(action == trap_request_action(trap_request), "valid action"); 297 assert(index == trap_request_index(trap_request), "valid index"); 298 return trap_request; 357 // Format like reason='foo' action='bar' index='123'. 358 // This is suitable both for XML and for tty output. 359 static const char* format_trap_request(char* buf, size_t buflen, 360 int trap_request); 361 362 static jint total_deoptimization_count(); 363 static jint deoptimization_count(DeoptReason reason); 364 365 // JVMTI PopFrame support 366 367 // Preserves incoming arguments to the popped frame when it is 368 // returning to a deoptimized caller 369 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); 370 371 static MethodData* get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); 372 private: 373 // Update the mdo's count and per-BCI reason bits, returning previous state: 374 static ProfileData* query_update_method_data(MethodData* trap_mdo, 375 int trap_bci, 376 DeoptReason reason, 377 Method* compiled_method, 378 //outputs: 379 uint& ret_this_trap_count, 380 bool& ret_maybe_prior_trap, 381 bool& ret_maybe_prior_recompile); 382 // class loading support for uncommon trap 383 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); 384 static void load_class_by_index(constantPoolHandle constant_pool, int index); 385 386 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); 387 388 static DeoptAction _unloaded_action; // == Action_reinterpret; 389 static const char* _trap_reason_name[]; 390 static const char* _trap_action_name[]; 391 392 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; 393 // Note: Histogram array size is 1-2 Kb. 394 395 public: 396 static void update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason); | 24 25 #ifndef SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP 26 #define SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP 27 28 #include "memory/allocation.hpp" 29 #include "runtime/frame.inline.hpp" 30 31 class ProfileData; 32 class vframeArray; 33 class MonitorValue; 34 class ObjectValue; 35 36 class Deoptimization : AllStatic { 37 friend class VMStructs; 38 39 public: 40 // What condition caused the deoptimization? 41 enum DeoptReason { 42 Reason_many = -1, // indicates presence of several reasons 43 Reason_none = 0, // indicates absence of a relevant deopt. 44 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits. 45 // This is more complicated for JVMCI as JVMCI may deoptimize to *some* bytecode before the 46 // bytecode that actually caused the deopt (with inlining, JVMCI may even deoptimize to a 47 // bytecode in another method): 48 // - bytecode y in method b() causes deopt 49 // - JVMCI deoptimizes to bytecode x in method a() 50 // -> the deopt reason will be recorded for method a() at bytecode x 51 Reason_null_check, // saw unexpected null or zero divisor (@bci) 52 Reason_null_assert, // saw unexpected non-null or non-zero (@bci) 53 Reason_range_check, // saw unexpected array index (@bci) 54 Reason_class_check, // saw unexpected object class (@bci) 55 Reason_array_check, // saw unexpected array class (aastore @bci) 56 Reason_intrinsic, // saw unexpected operand to intrinsic (@bci) 57 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci) 58 59 #if INCLUDE_JVMCI 60 Reason_unreached0 = Reason_null_assert, 61 Reason_type_checked_inlining = Reason_intrinsic, 62 Reason_optimized_type_check = Reason_bimorphic, 63 #endif 64 65 // recorded per method 66 Reason_unloaded, // unloaded class or constant pool entry 67 Reason_uninitialized, // bad class state (uninitialized) 68 Reason_unreached, // code is not reached, compiler 69 Reason_unhandled, // arbitrary compiler limitation 70 Reason_constraint, // arbitrary runtime constraint violated 71 Reason_div0_check, // a null_check due to division by zero 72 Reason_age, // nmethod too old; tier threshold reached 73 Reason_predicate, // compiler generated predicate failed 74 Reason_loop_limit_check, // compiler generated loop limits check failed 75 Reason_speculate_class_check, // saw unexpected object class from type speculation 76 Reason_speculate_null_check, // saw unexpected null from type speculation 77 Reason_rtm_state_change, // rtm state change detected 78 Reason_unstable_if, // a branch predicted always false was taken 79 Reason_unstable_fused_if, // fused two ifs that had each one untaken branch. One is now taken. 80 #if INCLUDE_JVMCI 81 Reason_aliasing, // optimistic assumption about aliasing failed 82 Reason_transfer_to_interpreter, // explicit transferToInterpreter() 83 Reason_not_compiled_exception_handler, 84 Reason_unresolved, 85 Reason_jsr_mismatch, 86 #endif 87 88 // Reason_tenured is counted separately, add normal counted Reasons above. 89 // Related to MethodData::_trap_hist_limit where Reason_tenured isn't included 90 Reason_tenured, // age of the code has reached the limit 91 Reason_LIMIT, 92 93 // Note: Keep this enum in sync. with _trap_reason_name. 94 Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc 95 // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of 96 // DataLayout::trap_bits. This dependency is enforced indirectly 97 // via asserts, to avoid excessive direct header-to-header dependencies. 98 // See Deoptimization::trap_state_reason and class DataLayout. 99 }; 100 101 // What action must be taken by the runtime? 102 enum DeoptAction { 103 Action_none, // just interpret, do not invalidate nmethod 104 Action_maybe_recompile, // recompile the nmethod; need not invalidate 105 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile 106 Action_make_not_entrant, // invalidate the nmethod, recompile (probably) 107 Action_make_not_compilable, // invalidate the nmethod and do not compile 108 Action_LIMIT 109 // Note: Keep this enum in sync. with _trap_action_name. 110 }; 111 112 enum { 113 _action_bits = 3, 114 _reason_bits = 5, 115 _debug_id_bits = 23, 116 _action_shift = 0, 117 _reason_shift = _action_shift+_action_bits, 118 _debug_id_shift = _reason_shift+_reason_bits, 119 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist 120 }; 121 122 enum UnpackType { 123 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack 124 Unpack_exception = 1, // exception is pending 125 Unpack_uncommon_trap = 2, // redo last byte code (C2 only) 126 Unpack_reexecute = 3 // reexecute bytecode (C1 only) 127 }; 128 129 // Checks all compiled methods. Invalid methods are deleted and 130 // corresponding activations are deoptimized. 131 static int deoptimize_dependents(); 132 133 // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame 134 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map); 135 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map, DeoptReason reason); 136 137 private: 138 // Does the actual work for deoptimizing a single frame 139 static void deoptimize_single_frame(JavaThread* thread, frame fr, DeoptReason reason); 140 141 // Helper function to revoke biases of all monitors in frame if UseBiasedLocking 142 // is enabled 143 static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map); 144 // Helper function to revoke biases of all monitors in frames 145 // executing in a particular CodeBlob if UseBiasedLocking is enabled 146 static void revoke_biases_of_monitors(CodeBlob* cb); 147 148 #if defined(COMPILER2) || INCLUDE_JVMCI 149 JVMCI_ONLY(public:) 150 151 // Support for restoring non-escaping objects 152 static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS); 153 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type); 154 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj); 155 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, bool realloc_failures); 156 static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread, bool realloc_failures); 157 static void pop_frames_failed_reallocs(JavaThread* thread, vframeArray* array); 158 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects, bool realloc_failures);) 159 #endif // COMPILER2 || INCLUDE_JVMCI 160 161 public: 162 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk, bool realloc_failures); 163 164 // Interface used for unpacking deoptimized frames 165 166 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob). 167 // This is only a CheapObj to ease debugging after a deopt failure 168 class UnrollBlock : public CHeapObj<mtCompiler> { 169 friend class VMStructs; 170 private: 171 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame 172 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame 173 int _number_of_frames; // Number frames to unroll 174 int _total_frame_sizes; // Total of number*sizes frames 175 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack 176 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack 177 intptr_t* _register_block; // Block for storing callee-saved registers. 178 BasicType _return_type; // Tells if we have to restore double or long return value 179 intptr_t _initial_info; // Platform dependent data for the sender frame (was FP on x86) 180 int _caller_actual_parameters; // The number of actual arguments at the 181 // interpreted caller of the deoptimized frame 182 183 // The following fields are used as temps during the unpacking phase 184 // (which is tight on registers, especially on x86). They really ought 185 // to be PD variables but that involves moving this class into its own 186 // file to use the pd include mechanism. Maybe in a later cleanup ... 187 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) 188 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) 189 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) 253 254 // Cleans up deoptimization bits on thread after unpacking or in the 255 // case of an exception. 256 static void cleanup_deopt_info(JavaThread *thread, 257 vframeArray * array); 258 259 // Restores callee saved values from deoptimized frame into oldest interpreter frame 260 // so caller of the deoptimized frame will get back the values it expects. 261 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); 262 263 //** Performs an uncommon trap for compiled code. 264 // The top most compiler frame is converted into interpreter frames 265 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); 266 // Helper routine that enters the VM and may block 267 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); 268 269 //** Deoptimizes the frame identified by id. 270 // Only called from VMDeoptimizeFrame 271 // @argument thread. Thread where stub_frame resides. 272 // @argument id. id of frame that should be deoptimized. 273 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id, DeoptReason reason); 274 275 // if thread is not the current thread then execute 276 // VM_DeoptimizeFrame otherwise deoptimize directly. 277 static void deoptimize_frame(JavaThread* thread, intptr_t* id, DeoptReason reason); 278 static void deoptimize_frame(JavaThread* thread, intptr_t* id); 279 280 // Statistics 281 static void gather_statistics(DeoptReason reason, DeoptAction action, 282 Bytecodes::Code bc = Bytecodes::_illegal); 283 static void print_statistics(); 284 285 // How much room to adjust the last frame's SP by, to make space for 286 // the callee's interpreter frame (which expects locals to be next to 287 // incoming arguments) 288 static int last_frame_adjust(int callee_parameters, int callee_locals); 289 290 // trap_request codes 291 static DeoptReason trap_request_reason(int trap_request) { 292 if (trap_request < 0) 293 return (DeoptReason) 294 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); 295 else 296 // standard reason for unloaded CP entry 297 return Reason_unloaded; 298 } 299 static DeoptAction trap_request_action(int trap_request) { 300 if (trap_request < 0) 301 return (DeoptAction) 302 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); 303 else 304 // standard action for unloaded CP entry 305 return _unloaded_action; 306 } 307 static int trap_request_debug_id(int trap_request) { 308 if (trap_request < 0) { 309 return ((~(trap_request) >> _debug_id_shift) & right_n_bits(_debug_id_bits)); 310 } else { 311 // standard action for unloaded CP entry 312 return 0; 313 } 314 } 315 static int trap_request_index(int trap_request) { 316 if (trap_request < 0) 317 return -1; 318 else 319 return trap_request; 320 } 321 static int make_trap_request(DeoptReason reason, DeoptAction action, 322 int index = -1) { 323 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); 324 assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); 325 int trap_request; 326 if (index != -1) 327 trap_request = index; 328 else 329 trap_request = (~(((reason) << _reason_shift) 330 + ((action) << _action_shift))); 331 assert(reason == trap_request_reason(trap_request), "valid reason"); 332 assert(action == trap_request_action(trap_request), "valid action"); 333 assert(index == trap_request_index(trap_request), "valid index"); 334 return trap_request; 393 // Format like reason='foo' action='bar' index='123'. 394 // This is suitable both for XML and for tty output. 395 static const char* format_trap_request(char* buf, size_t buflen, 396 int trap_request); 397 398 static jint total_deoptimization_count(); 399 static jint deoptimization_count(DeoptReason reason); 400 401 // JVMTI PopFrame support 402 403 // Preserves incoming arguments to the popped frame when it is 404 // returning to a deoptimized caller 405 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); 406 407 static MethodData* get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); 408 private: 409 // Update the mdo's count and per-BCI reason bits, returning previous state: 410 static ProfileData* query_update_method_data(MethodData* trap_mdo, 411 int trap_bci, 412 DeoptReason reason, 413 bool update_total_trap_count, 414 #if INCLUDE_JVMCI 415 bool is_osr, 416 #endif 417 Method* compiled_method, 418 //outputs: 419 uint& ret_this_trap_count, 420 bool& ret_maybe_prior_trap, 421 bool& ret_maybe_prior_recompile); 422 // class loading support for uncommon trap 423 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); 424 static void load_class_by_index(constantPoolHandle constant_pool, int index); 425 426 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); 427 428 static DeoptAction _unloaded_action; // == Action_reinterpret; 429 static const char* _trap_reason_name[]; 430 static const char* _trap_action_name[]; 431 432 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; 433 // Note: Histogram array size is 1-2 Kb. 434 435 public: 436 static void update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason); |