Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.hpp @ 3018:5857923e563c
Fixed an issue with frame states in exception dispatch chains (now we are correctly rethrowing the exception immediately at entering the interpreter).
| author | Thomas Wuerthinger <thomas@wuerthinger.net> |
|---|---|
| date | Sat, 18 Jun 2011 19:13:55 +0200 |
| parents | 1d1603768966 |
| children | 79165996a12d |
| 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 |
| 0 | 59 Reason_LIMIT, |
| 60 // Note: Keep this enum in sync. with _trap_reason_name. | |
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61 Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc |
| 0 | 62 // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of |
| 63 // DataLayout::trap_bits. This dependency is enforced indirectly | |
| 64 // via asserts, to avoid excessive direct header-to-header dependencies. | |
| 65 // See Deoptimization::trap_state_reason and class DataLayout. | |
| 66 }; | |
| 67 | |
| 68 // What action must be taken by the runtime? | |
| 69 enum DeoptAction { | |
| 70 Action_none, // just interpret, do not invalidate nmethod | |
| 71 Action_maybe_recompile, // recompile the nmethod; need not invalidate | |
| 72 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile | |
| 73 Action_make_not_entrant, // invalidate the nmethod, recompile (probably) | |
| 74 Action_make_not_compilable, // invalidate the nmethod and do not compile | |
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Fixed an issue with frame states in exception dispatch chains (now we are correctly rethrowing the exception immediately at entering the interpreter).
Thomas Wuerthinger <thomas@wuerthinger.net>
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75 Action_rethrow_exception_in_interpreter, |
| 0 | 76 Action_LIMIT |
| 77 // Note: Keep this enum in sync. with _trap_action_name. | |
| 78 }; | |
| 79 | |
| 80 enum { | |
| 81 _action_bits = 3, | |
| 82 _reason_bits = 4, | |
| 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 |
| 0 | 141 // The following fields are used as temps during the unpacking phase |
| 142 // (which is tight on registers, especially on x86). They really ought | |
| 143 // to be PD variables but that involves moving this class into its own | |
| 144 // file to use the pd include mechanism. Maybe in a later cleanup ... | |
| 145 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) | |
| 146 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) | |
| 147 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) | |
| 148 public: | |
| 149 // Constructor | |
| 150 UnrollBlock(int size_of_deoptimized_frame, | |
| 151 int caller_adjustment, | |
| 152 int number_of_frames, | |
| 153 intptr_t* frame_sizes, | |
| 154 address* frames_pcs, | |
| 155 BasicType return_type); | |
| 156 ~UnrollBlock(); | |
| 157 | |
| 158 // Returns where a register is located. | |
| 159 intptr_t* value_addr_at(int register_number) const; | |
| 160 | |
| 161 // Accessors | |
| 162 intptr_t* frame_sizes() const { return _frame_sizes; } | |
| 163 int number_of_frames() const { return _number_of_frames; } | |
| 164 address* frame_pcs() const { return _frame_pcs ; } | |
| 165 | |
| 166 // Returns the total size of frames | |
| 167 int size_of_frames() const; | |
| 168 | |
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169 void set_initial_fp(intptr_t fp) { _initial_fp = fp; } |
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170 |
| 0 | 171 // Accessors used by the code generator for the unpack stub. |
| 172 static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); } | |
| 173 static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); } | |
| 174 static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); } | |
| 175 static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); } | |
| 176 static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); } | |
| 177 static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); } | |
| 178 static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); } | |
| 179 static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); } | |
| 180 static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); } | |
| 181 static int initial_fp_offset_in_bytes() { return offset_of(UnrollBlock, _initial_fp); } | |
| 182 static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); } | |
| 183 static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); } | |
| 184 | |
| 185 BasicType return_type() const { return _return_type; } | |
| 186 void print(); | |
| 187 }; | |
| 188 | |
| 189 //** Returns an UnrollBlock continuing information | |
| 190 // how to make room for the resulting interpreter frames. | |
| 191 // Called by assembly stub after execution has returned to | |
| 192 // deoptimized frame. | |
| 193 // @argument thread. Thread where stub_frame resides. | |
| 194 // @see OptoRuntime::deoptimization_fetch_unroll_info_C | |
| 195 static UnrollBlock* fetch_unroll_info(JavaThread* thread); | |
| 196 | |
| 197 //** Unpacks vframeArray onto execution stack | |
| 198 // Called by assembly stub after execution has returned to | |
| 199 // deoptimized frame and after the stack unrolling. | |
| 200 // @argument thread. Thread where stub_frame resides. | |
| 201 // @argument exec_mode. Determines how execution should be continuted in top frame. | |
| 202 // 0 means continue after current byte code | |
| 203 // 1 means exception has happened, handle exception | |
| 204 // 2 means reexecute current bytecode (for uncommon traps). | |
| 205 // @see OptoRuntime::deoptimization_unpack_frames_C | |
| 206 // Return BasicType of call return type, if any | |
| 207 static BasicType unpack_frames(JavaThread* thread, int exec_mode); | |
| 208 | |
| 209 // Cleans up deoptimization bits on thread after unpacking or in the | |
| 210 // case of an exception. | |
| 211 static void cleanup_deopt_info(JavaThread *thread, | |
| 212 vframeArray * array); | |
| 213 | |
| 214 // Restores callee saved values from deoptimized frame into oldest interpreter frame | |
| 215 // so caller of the deoptimized frame will get back the values it expects. | |
| 216 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); | |
| 217 | |
| 218 //** Performs an uncommon trap for compiled code. | |
| 219 // The top most compiler frame is converted into interpreter frames | |
| 220 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); | |
| 221 // Helper routine that enters the VM and may block | |
| 222 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); | |
| 223 | |
| 224 //** Deoptimizes the frame identified by id. | |
| 225 // Only called from VMDeoptimizeFrame | |
| 226 // @argument thread. Thread where stub_frame resides. | |
| 227 // @argument id. id of frame that should be deoptimized. | |
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228 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id); |
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229 |
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230 // If thread is not the current thread then execute |
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231 // VM_DeoptimizeFrame otherwise deoptimize directly. |
| 0 | 232 static void deoptimize_frame(JavaThread* thread, intptr_t* id); |
| 233 | |
| 234 // Statistics | |
| 235 static void gather_statistics(DeoptReason reason, DeoptAction action, | |
| 236 Bytecodes::Code bc = Bytecodes::_illegal); | |
| 237 static void print_statistics(); | |
| 238 | |
| 239 // How much room to adjust the last frame's SP by, to make space for | |
| 240 // the callee's interpreter frame (which expects locals to be next to | |
| 241 // incoming arguments) | |
| 242 static int last_frame_adjust(int callee_parameters, int callee_locals); | |
| 243 | |
| 244 // trap_request codes | |
| 245 static DeoptReason trap_request_reason(int trap_request) { | |
| 246 if (trap_request < 0) | |
| 247 return (DeoptReason) | |
| 248 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); | |
| 249 else | |
| 250 // standard reason for unloaded CP entry | |
| 251 return Reason_unloaded; | |
| 252 } | |
| 253 static DeoptAction trap_request_action(int trap_request) { | |
| 254 if (trap_request < 0) | |
| 255 return (DeoptAction) | |
| 256 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); | |
| 257 else | |
| 258 // standard action for unloaded CP entry | |
| 259 return _unloaded_action; | |
| 260 } | |
| 261 static int trap_request_index(int trap_request) { | |
| 262 if (trap_request < 0) | |
| 263 return -1; | |
| 264 else | |
| 265 return trap_request; | |
| 266 } | |
| 267 static int make_trap_request(DeoptReason reason, DeoptAction action, | |
| 268 int index = -1) { | |
| 269 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); | |
| 270 assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); | |
| 271 int trap_request; | |
| 272 if (index != -1) | |
| 273 trap_request = index; | |
| 274 else | |
| 275 trap_request = (~(((reason) << _reason_shift) | |
| 276 + ((action) << _action_shift))); | |
| 277 assert(reason == trap_request_reason(trap_request), "valid reason"); | |
| 278 assert(action == trap_request_action(trap_request), "valid action"); | |
| 279 assert(index == trap_request_index(trap_request), "valid index"); | |
| 280 return trap_request; | |
| 281 } | |
| 282 | |
| 283 // The trap_state stored in a MDO is decoded here. | |
| 284 // It records two items of information. | |
| 285 // reason: If a deoptimization happened here, what its reason was, | |
| 286 // or if there were multiple deopts with differing reasons. | |
| 287 // recompiled: If a deoptimization here triggered a recompilation. | |
| 288 // Note that not all reasons are recorded per-bci. | |
| 289 static DeoptReason trap_state_reason(int trap_state); | |
| 290 static int trap_state_has_reason(int trap_state, int reason); | |
| 291 static int trap_state_add_reason(int trap_state, int reason); | |
| 292 static bool trap_state_is_recompiled(int trap_state); | |
| 293 static int trap_state_set_recompiled(int trap_state, bool z); | |
| 294 static const char* format_trap_state(char* buf, size_t buflen, | |
| 295 int trap_state); | |
| 296 | |
| 297 static bool reason_is_recorded_per_bytecode(DeoptReason reason) { | |
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298 return reason > Reason_none && reason <= Reason_RECORDED_LIMIT; |
| 0 | 299 } |
| 300 | |
| 301 static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) { | |
| 302 if (reason_is_recorded_per_bytecode(reason)) | |
| 303 return reason; | |
| 304 else if (reason == Reason_div0_check) // null check due to divide-by-zero? | |
| 305 return Reason_null_check; // recorded per BCI as a null check | |
| 306 else | |
| 307 return Reason_none; | |
| 308 } | |
| 309 | |
| 310 static const char* trap_reason_name(int reason); | |
| 311 static const char* trap_action_name(int action); | |
| 312 // Format like reason='foo' action='bar' index='123'. | |
| 313 // This is suitable both for XML and for tty output. | |
| 314 static const char* format_trap_request(char* buf, size_t buflen, | |
| 315 int trap_request); | |
| 316 | |
| 317 static jint total_deoptimization_count(); | |
| 318 static jint deoptimization_count(DeoptReason reason); | |
| 319 | |
| 320 // JVMTI PopFrame support | |
| 321 | |
| 322 // Preserves incoming arguments to the popped frame when it is | |
| 323 // returning to a deoptimized caller | |
| 324 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); | |
| 325 | |
| 326 private: | |
| 327 static methodDataOop get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); | |
| 328 // Update the mdo's count and per-BCI reason bits, returning previous state: | |
| 329 static ProfileData* query_update_method_data(methodDataHandle trap_mdo, | |
| 330 int trap_bci, | |
| 331 DeoptReason reason, | |
| 332 //outputs: | |
| 333 uint& ret_this_trap_count, | |
| 334 bool& ret_maybe_prior_trap, | |
| 335 bool& ret_maybe_prior_recompile); | |
| 336 // class loading support for uncommon trap | |
| 337 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); | |
| 338 static void load_class_by_index(constantPoolHandle constant_pool, int index); | |
| 339 | |
| 340 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); | |
| 341 | |
| 342 static DeoptAction _unloaded_action; // == Action_reinterpret; | |
| 343 static const char* _trap_reason_name[Reason_LIMIT]; | |
| 344 static const char* _trap_action_name[Action_LIMIT]; | |
| 345 | |
| 346 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; | |
| 347 // Note: Histogram array size is 1-2 Kb. | |
| 348 | |
| 349 public: | |
| 350 static void update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason); | |
| 351 }; | |
| 352 | |
| 353 class DeoptimizationMarker : StackObj { // for profiling | |
| 354 static bool _is_active; | |
| 355 public: | |
| 356 DeoptimizationMarker() { _is_active = true; } | |
| 357 ~DeoptimizationMarker() { _is_active = false; } | |
| 358 static bool is_active() { return _is_active; } | |
| 359 }; | |
| 1972 | 360 |
| 361 #endif // SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP |