Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.hpp @ 3917:eca1193ca245
4965777: GC changes to support use of discovered field for pending references
Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose.
Reviewed-by: jcoomes, mchung, stefank
| author | ysr |
|---|---|
| date | Wed, 07 Sep 2011 13:55:42 -0700 |
| parents | 3d2ab563047a |
| children | be4ca325525a 5432047c7db7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 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 | |
| 0 | 31 class ProfileData; |
| 32 class vframeArray; | |
| 33 class MonitorValue; | |
| 34 class ObjectValue; | |
| 35 | |
| 36 class Deoptimization : AllStatic { | |
| 37 public: | |
| 38 // What condition caused the deoptimization? | |
| 39 enum DeoptReason { | |
| 40 Reason_many = -1, // indicates presence of several reasons | |
| 41 Reason_none = 0, // indicates absence of a relevant deopt. | |
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42 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits |
| 0 | 43 Reason_null_check, // saw unexpected null or zero divisor (@bci) |
| 44 Reason_null_assert, // saw unexpected non-null or non-zero (@bci) | |
| 45 Reason_range_check, // saw unexpected array index (@bci) | |
| 46 Reason_class_check, // saw unexpected object class (@bci) | |
| 47 Reason_array_check, // saw unexpected array class (aastore @bci) | |
| 48 Reason_intrinsic, // saw unexpected operand to intrinsic (@bci) | |
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49 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci) |
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50 |
| 0 | 51 Reason_unloaded, // unloaded class or constant pool entry |
| 52 Reason_uninitialized, // bad class state (uninitialized) | |
| 53 Reason_unreached, // code is not reached, compiler | |
| 54 Reason_unhandled, // arbitrary compiler limitation | |
| 55 Reason_constraint, // arbitrary runtime constraint violated | |
| 56 Reason_div0_check, // a null_check due to division by zero | |
| 57 Reason_age, // nmethod too old; tier threshold reached | |
| 1172 | 58 Reason_predicate, // compiler generated predicate failed |
| 3345 | 59 Reason_loop_limit_check, // compiler generated loop limits check failed |
| 0 | 60 Reason_LIMIT, |
| 61 // Note: Keep this enum in sync. with _trap_reason_name. | |
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62 Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc |
| 0 | 63 // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of |
| 64 // DataLayout::trap_bits. This dependency is enforced indirectly | |
| 65 // via asserts, to avoid excessive direct header-to-header dependencies. | |
| 66 // See Deoptimization::trap_state_reason and class DataLayout. | |
| 67 }; | |
| 68 | |
| 69 // What action must be taken by the runtime? | |
| 70 enum DeoptAction { | |
| 71 Action_none, // just interpret, do not invalidate nmethod | |
| 72 Action_maybe_recompile, // recompile the nmethod; need not invalidate | |
| 73 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile | |
| 74 Action_make_not_entrant, // invalidate the nmethod, recompile (probably) | |
| 75 Action_make_not_compilable, // invalidate the nmethod and do not compile | |
| 76 Action_LIMIT | |
| 77 // Note: Keep this enum in sync. with _trap_action_name. | |
| 78 }; | |
| 79 | |
| 80 enum { | |
| 81 _action_bits = 3, | |
| 3345 | 82 _reason_bits = 5, |
| 0 | 83 _action_shift = 0, |
| 84 _reason_shift = _action_shift+_action_bits, | |
| 85 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist | |
| 86 }; | |
| 87 | |
| 88 enum UnpackType { | |
| 89 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack | |
| 90 Unpack_exception = 1, // exception is pending | |
| 91 Unpack_uncommon_trap = 2, // redo last byte code (C2 only) | |
| 92 Unpack_reexecute = 3 // reexecute bytecode (C1 only) | |
| 93 }; | |
| 94 | |
| 95 // Checks all compiled methods. Invalid methods are deleted and | |
| 96 // corresponding activations are deoptimized. | |
| 97 static int deoptimize_dependents(); | |
| 98 | |
| 99 // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame | |
| 100 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map); | |
| 101 | |
| 102 private: | |
| 103 // Does the actual work for deoptimizing a single frame | |
| 104 static void deoptimize_single_frame(JavaThread* thread, frame fr); | |
| 105 | |
| 106 // Helper function to revoke biases of all monitors in frame if UseBiasedLocking | |
| 107 // is enabled | |
| 108 static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map); | |
| 109 // Helper function to revoke biases of all monitors in frames | |
| 110 // executing in a particular CodeBlob if UseBiasedLocking is enabled | |
| 111 static void revoke_biases_of_monitors(CodeBlob* cb); | |
| 112 | |
| 113 #ifdef COMPILER2 | |
| 114 // Support for restoring non-escaping objects | |
| 115 static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS); | |
| 116 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type); | |
| 117 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj); | |
| 118 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects); | |
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119 static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread); |
| 0 | 120 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects);) |
| 121 #endif // COMPILER2 | |
| 122 | |
| 123 public: | |
| 124 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk); | |
| 125 | |
| 126 // Interface used for unpacking deoptimized frames | |
| 127 | |
| 128 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob). | |
| 129 // This is only a CheapObj to ease debugging after a deopt failure | |
| 130 class UnrollBlock : public CHeapObj { | |
| 131 private: | |
| 132 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame | |
| 133 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame | |
| 134 int _number_of_frames; // Number frames to unroll | |
| 135 int _total_frame_sizes; // Total of number*sizes frames | |
| 136 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack | |
| 137 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack | |
| 138 intptr_t* _register_block; // Block for storing callee-saved registers. | |
| 139 BasicType _return_type; // Tells if we have to restore double or long return value | |
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140 intptr_t _initial_fp; // FP of the sender frame |
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141 int _caller_actual_parameters; // The number of actual arguments at the |
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142 // interpreted caller of the deoptimized frame |
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143 |
| 0 | 144 // The following fields are used as temps during the unpacking phase |
| 145 // (which is tight on registers, especially on x86). They really ought | |
| 146 // to be PD variables but that involves moving this class into its own | |
| 147 // file to use the pd include mechanism. Maybe in a later cleanup ... | |
| 148 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) | |
| 149 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) | |
| 150 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) | |
| 151 public: | |
| 152 // Constructor | |
| 153 UnrollBlock(int size_of_deoptimized_frame, | |
| 154 int caller_adjustment, | |
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155 int caller_actual_parameters, |
| 0 | 156 int number_of_frames, |
| 157 intptr_t* frame_sizes, | |
| 158 address* frames_pcs, | |
| 159 BasicType return_type); | |
| 160 ~UnrollBlock(); | |
| 161 | |
| 162 // Returns where a register is located. | |
| 163 intptr_t* value_addr_at(int register_number) const; | |
| 164 | |
| 165 // Accessors | |
| 166 intptr_t* frame_sizes() const { return _frame_sizes; } | |
| 167 int number_of_frames() const { return _number_of_frames; } | |
| 168 address* frame_pcs() const { return _frame_pcs ; } | |
| 169 | |
| 170 // Returns the total size of frames | |
| 171 int size_of_frames() const; | |
| 172 | |
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173 void set_initial_fp(intptr_t fp) { _initial_fp = fp; } |
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174 |
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175 int caller_actual_parameters() const { return _caller_actual_parameters; } |
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176 |
| 0 | 177 // Accessors used by the code generator for the unpack stub. |
| 178 static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); } | |
| 179 static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); } | |
| 180 static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); } | |
| 181 static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); } | |
| 182 static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); } | |
| 183 static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); } | |
| 184 static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); } | |
| 185 static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); } | |
| 186 static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); } | |
| 187 static int initial_fp_offset_in_bytes() { return offset_of(UnrollBlock, _initial_fp); } | |
| 188 static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); } | |
| 189 static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); } | |
| 190 | |
| 191 BasicType return_type() const { return _return_type; } | |
| 192 void print(); | |
| 193 }; | |
| 194 | |
| 195 //** Returns an UnrollBlock continuing information | |
| 196 // how to make room for the resulting interpreter frames. | |
| 197 // Called by assembly stub after execution has returned to | |
| 198 // deoptimized frame. | |
| 199 // @argument thread. Thread where stub_frame resides. | |
| 200 // @see OptoRuntime::deoptimization_fetch_unroll_info_C | |
| 201 static UnrollBlock* fetch_unroll_info(JavaThread* thread); | |
| 202 | |
| 203 //** Unpacks vframeArray onto execution stack | |
| 204 // Called by assembly stub after execution has returned to | |
| 205 // deoptimized frame and after the stack unrolling. | |
| 206 // @argument thread. Thread where stub_frame resides. | |
| 207 // @argument exec_mode. Determines how execution should be continuted in top frame. | |
| 208 // 0 means continue after current byte code | |
| 209 // 1 means exception has happened, handle exception | |
| 210 // 2 means reexecute current bytecode (for uncommon traps). | |
| 211 // @see OptoRuntime::deoptimization_unpack_frames_C | |
| 212 // Return BasicType of call return type, if any | |
| 213 static BasicType unpack_frames(JavaThread* thread, int exec_mode); | |
| 214 | |
| 215 // Cleans up deoptimization bits on thread after unpacking or in the | |
| 216 // case of an exception. | |
| 217 static void cleanup_deopt_info(JavaThread *thread, | |
| 218 vframeArray * array); | |
| 219 | |
| 220 // Restores callee saved values from deoptimized frame into oldest interpreter frame | |
| 221 // so caller of the deoptimized frame will get back the values it expects. | |
| 222 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); | |
| 223 | |
| 224 //** Performs an uncommon trap for compiled code. | |
| 225 // The top most compiler frame is converted into interpreter frames | |
| 226 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); | |
| 227 // Helper routine that enters the VM and may block | |
| 228 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); | |
| 229 | |
| 230 //** Deoptimizes the frame identified by id. | |
| 231 // Only called from VMDeoptimizeFrame | |
| 232 // @argument thread. Thread where stub_frame resides. | |
| 233 // @argument id. id of frame that should be deoptimized. | |
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234 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id); |
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235 |
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236 // If thread is not the current thread then execute |
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237 // VM_DeoptimizeFrame otherwise deoptimize directly. |
| 0 | 238 static void deoptimize_frame(JavaThread* thread, intptr_t* id); |
| 239 | |
| 240 // Statistics | |
| 241 static void gather_statistics(DeoptReason reason, DeoptAction action, | |
| 242 Bytecodes::Code bc = Bytecodes::_illegal); | |
| 243 static void print_statistics(); | |
| 244 | |
| 245 // How much room to adjust the last frame's SP by, to make space for | |
| 246 // the callee's interpreter frame (which expects locals to be next to | |
| 247 // incoming arguments) | |
| 248 static int last_frame_adjust(int callee_parameters, int callee_locals); | |
| 249 | |
| 250 // trap_request codes | |
| 251 static DeoptReason trap_request_reason(int trap_request) { | |
| 252 if (trap_request < 0) | |
| 253 return (DeoptReason) | |
| 254 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); | |
| 255 else | |
| 256 // standard reason for unloaded CP entry | |
| 257 return Reason_unloaded; | |
| 258 } | |
| 259 static DeoptAction trap_request_action(int trap_request) { | |
| 260 if (trap_request < 0) | |
| 261 return (DeoptAction) | |
| 262 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); | |
| 263 else | |
| 264 // standard action for unloaded CP entry | |
| 265 return _unloaded_action; | |
| 266 } | |
| 267 static int trap_request_index(int trap_request) { | |
| 268 if (trap_request < 0) | |
| 269 return -1; | |
| 270 else | |
| 271 return trap_request; | |
| 272 } | |
| 273 static int make_trap_request(DeoptReason reason, DeoptAction action, | |
| 274 int index = -1) { | |
| 275 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); | |
| 276 assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); | |
| 277 int trap_request; | |
| 278 if (index != -1) | |
| 279 trap_request = index; | |
| 280 else | |
| 281 trap_request = (~(((reason) << _reason_shift) | |
| 282 + ((action) << _action_shift))); | |
| 283 assert(reason == trap_request_reason(trap_request), "valid reason"); | |
| 284 assert(action == trap_request_action(trap_request), "valid action"); | |
| 285 assert(index == trap_request_index(trap_request), "valid index"); | |
| 286 return trap_request; | |
| 287 } | |
| 288 | |
| 289 // The trap_state stored in a MDO is decoded here. | |
| 290 // It records two items of information. | |
| 291 // reason: If a deoptimization happened here, what its reason was, | |
| 292 // or if there were multiple deopts with differing reasons. | |
| 293 // recompiled: If a deoptimization here triggered a recompilation. | |
| 294 // Note that not all reasons are recorded per-bci. | |
| 295 static DeoptReason trap_state_reason(int trap_state); | |
| 296 static int trap_state_has_reason(int trap_state, int reason); | |
| 297 static int trap_state_add_reason(int trap_state, int reason); | |
| 298 static bool trap_state_is_recompiled(int trap_state); | |
| 299 static int trap_state_set_recompiled(int trap_state, bool z); | |
| 300 static const char* format_trap_state(char* buf, size_t buflen, | |
| 301 int trap_state); | |
| 302 | |
| 303 static bool reason_is_recorded_per_bytecode(DeoptReason reason) { | |
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304 return reason > Reason_none && reason <= Reason_RECORDED_LIMIT; |
| 0 | 305 } |
| 306 | |
| 307 static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) { | |
| 308 if (reason_is_recorded_per_bytecode(reason)) | |
| 309 return reason; | |
| 310 else if (reason == Reason_div0_check) // null check due to divide-by-zero? | |
| 311 return Reason_null_check; // recorded per BCI as a null check | |
| 312 else | |
| 313 return Reason_none; | |
| 314 } | |
| 315 | |
| 316 static const char* trap_reason_name(int reason); | |
| 317 static const char* trap_action_name(int action); | |
| 318 // Format like reason='foo' action='bar' index='123'. | |
| 319 // This is suitable both for XML and for tty output. | |
| 320 static const char* format_trap_request(char* buf, size_t buflen, | |
| 321 int trap_request); | |
| 322 | |
| 323 static jint total_deoptimization_count(); | |
| 324 static jint deoptimization_count(DeoptReason reason); | |
| 325 | |
| 326 // JVMTI PopFrame support | |
| 327 | |
| 328 // Preserves incoming arguments to the popped frame when it is | |
| 329 // returning to a deoptimized caller | |
| 330 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); | |
| 331 | |
| 332 private: | |
| 333 static methodDataOop get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); | |
| 334 // Update the mdo's count and per-BCI reason bits, returning previous state: | |
| 335 static ProfileData* query_update_method_data(methodDataHandle trap_mdo, | |
| 336 int trap_bci, | |
| 337 DeoptReason reason, | |
| 338 //outputs: | |
| 339 uint& ret_this_trap_count, | |
| 340 bool& ret_maybe_prior_trap, | |
| 341 bool& ret_maybe_prior_recompile); | |
| 342 // class loading support for uncommon trap | |
| 343 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); | |
| 344 static void load_class_by_index(constantPoolHandle constant_pool, int index); | |
| 345 | |
| 346 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); | |
| 347 | |
| 348 static DeoptAction _unloaded_action; // == Action_reinterpret; | |
| 349 static const char* _trap_reason_name[Reason_LIMIT]; | |
| 350 static const char* _trap_action_name[Action_LIMIT]; | |
| 351 | |
| 352 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; | |
| 353 // Note: Histogram array size is 1-2 Kb. | |
| 354 | |
| 355 public: | |
| 356 static void update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason); | |
| 357 }; | |
| 358 | |
| 359 class DeoptimizationMarker : StackObj { // for profiling | |
| 360 static bool _is_active; | |
| 361 public: | |
| 362 DeoptimizationMarker() { _is_active = true; } | |
| 363 ~DeoptimizationMarker() { _is_active = false; } | |
| 364 static bool is_active() { return _is_active; } | |
| 365 }; | |
| 1972 | 366 |
| 367 #endif // SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP |