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src/share/vm/runtime/deoptimization.hpp

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  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, bool skip_internal);
 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);
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