Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.hpp @ 13155:1dd9aa5a9ee5
Deoptimization reason for failed aliasing assumptions.
| author | Roland Schatz <roland.schatz@oracle.com> |
|---|---|
| date | Mon, 25 Nov 2013 17:23:56 +0100 |
| parents | df7fa4734c44 |
| children | 6b2d8d20ecbd |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 { | |
| 3939 | 37 friend class VMStructs; |
| 38 | |
| 0 | 39 public: |
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40 // What condition caused the deoptimization? |
| 0 | 41 enum DeoptReason { |
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42 Reason_many = -1, // indicates presence of several reasons |
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43 Reason_none = 0, // indicates absence of a relevant deopt. |
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44 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits. |
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45 // This is more complicated for Graal as Graal may deoptimize to *some* bytecode before the |
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46 // bytecode that actually caused the deopt (with inlining, Graal may even deoptimize to a |
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47 // bytecode in another method): |
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48 // - bytecode y in method b() causes deopt |
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49 // - Graal deoptimizes to bytecode x in method a() |
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50 // -> the deopt reason will be recorded for method a() at bytecode x |
| 0 | 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) | |
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57 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci) |
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58 |
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59 #ifdef GRAAL |
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60 Reason_unreached0 = Reason_null_assert, |
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61 Reason_type_checked_inlining = Reason_intrinsic, |
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62 Reason_optimized_type_check = Reason_bimorphic, |
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63 #endif |
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64 |
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65 // recorded per method |
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66 Reason_unloaded, // unloaded class or constant pool entry |
| 0 | 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 | |
| 1172 | 73 Reason_predicate, // compiler generated predicate failed |
| 3345 | 74 Reason_loop_limit_check, // compiler generated loop limits check failed |
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75 #ifdef GRAAL |
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76 Reason_aliasing, // optimistic assumption about aliasing failed |
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77 #endif |
| 0 | 78 Reason_LIMIT, |
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79 |
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80 #ifdef GRAAL |
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81 Reason_not_compiled_exception_handler = Reason_unhandled, |
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82 Reason_unresolved = Reason_uninitialized, |
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83 Reason_jsr_mismatch = Reason_age, |
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84 #endif |
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85 |
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86 // Note: Keep this enum in sync. with _trap_reason_name. |
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87 Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc |
| 0 | 88 // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of |
| 89 // DataLayout::trap_bits. This dependency is enforced indirectly | |
| 90 // via asserts, to avoid excessive direct header-to-header dependencies. | |
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91 // See Deoptimization::trap_state_reason and class DataLayout. |
| 0 | 92 }; |
| 93 | |
| 94 // What action must be taken by the runtime? | |
| 95 enum DeoptAction { | |
| 96 Action_none, // just interpret, do not invalidate nmethod | |
| 97 Action_maybe_recompile, // recompile the nmethod; need not invalidate | |
| 98 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile | |
| 99 Action_make_not_entrant, // invalidate the nmethod, recompile (probably) | |
| 100 Action_make_not_compilable, // invalidate the nmethod and do not compile | |
| 101 Action_LIMIT | |
| 102 // Note: Keep this enum in sync. with _trap_action_name. | |
| 103 }; | |
| 104 | |
| 105 enum { | |
| 106 _action_bits = 3, | |
| 3345 | 107 _reason_bits = 5, |
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108 _speculation_id_bits = 23, |
| 0 | 109 _action_shift = 0, |
| 110 _reason_shift = _action_shift+_action_bits, | |
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111 _speculation_id_shift = _reason_shift+_reason_bits, |
| 0 | 112 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist |
| 113 }; | |
| 114 | |
| 115 enum UnpackType { | |
| 116 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack | |
| 117 Unpack_exception = 1, // exception is pending | |
| 118 Unpack_uncommon_trap = 2, // redo last byte code (C2 only) | |
| 119 Unpack_reexecute = 3 // reexecute bytecode (C1 only) | |
| 120 }; | |
| 121 | |
| 122 // Checks all compiled methods. Invalid methods are deleted and | |
| 123 // corresponding activations are deoptimized. | |
| 124 static int deoptimize_dependents(); | |
| 125 | |
| 126 // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame | |
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127 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map, DeoptReason reason); |
| 0 | 128 |
| 129 private: | |
| 130 // Does the actual work for deoptimizing a single frame | |
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131 static void deoptimize_single_frame(JavaThread* thread, frame fr, DeoptReason reason); |
| 0 | 132 |
| 133 // Helper function to revoke biases of all monitors in frame if UseBiasedLocking | |
| 134 // is enabled | |
| 135 static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map); | |
| 136 // Helper function to revoke biases of all monitors in frames | |
| 137 // executing in a particular CodeBlob if UseBiasedLocking is enabled | |
| 138 static void revoke_biases_of_monitors(CodeBlob* cb); | |
| 139 | |
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140 #if defined(COMPILER2) || defined(GRAAL) |
| 0 | 141 // Support for restoring non-escaping objects |
| 142 static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS); | |
| 143 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type); | |
| 144 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj); | |
| 145 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects); | |
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146 static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread); |
| 0 | 147 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects);) |
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148 #endif // COMPILER2 || GRAAL |
| 0 | 149 |
| 150 public: | |
| 151 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk); | |
| 152 | |
| 153 // Interface used for unpacking deoptimized frames | |
| 154 | |
| 155 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob). | |
| 156 // This is only a CheapObj to ease debugging after a deopt failure | |
| 6197 | 157 class UnrollBlock : public CHeapObj<mtCompiler> { |
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158 friend class VMStructs; |
| 0 | 159 private: |
| 160 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame | |
| 161 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame | |
| 162 int _number_of_frames; // Number frames to unroll | |
| 163 int _total_frame_sizes; // Total of number*sizes frames | |
| 164 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack | |
| 165 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack | |
| 166 intptr_t* _register_block; // Block for storing callee-saved registers. | |
| 167 BasicType _return_type; // Tells if we have to restore double or long return value | |
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168 intptr_t _initial_info; // Platform dependent data for the sender frame (was FP on x86) |
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169 int _caller_actual_parameters; // The number of actual arguments at the |
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170 // interpreted caller of the deoptimized frame |
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171 |
| 0 | 172 // The following fields are used as temps during the unpacking phase |
| 173 // (which is tight on registers, especially on x86). They really ought | |
| 174 // to be PD variables but that involves moving this class into its own | |
| 175 // file to use the pd include mechanism. Maybe in a later cleanup ... | |
| 176 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) | |
| 177 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) | |
| 178 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) | |
| 179 public: | |
| 180 // Constructor | |
| 181 UnrollBlock(int size_of_deoptimized_frame, | |
| 182 int caller_adjustment, | |
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183 int caller_actual_parameters, |
| 0 | 184 int number_of_frames, |
| 185 intptr_t* frame_sizes, | |
| 186 address* frames_pcs, | |
| 187 BasicType return_type); | |
| 188 ~UnrollBlock(); | |
| 189 | |
| 190 // Returns where a register is located. | |
| 191 intptr_t* value_addr_at(int register_number) const; | |
| 192 | |
| 193 // Accessors | |
| 194 intptr_t* frame_sizes() const { return _frame_sizes; } | |
| 195 int number_of_frames() const { return _number_of_frames; } | |
| 196 address* frame_pcs() const { return _frame_pcs ; } | |
| 197 | |
| 198 // Returns the total size of frames | |
| 199 int size_of_frames() const; | |
| 200 | |
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201 void set_initial_info(intptr_t info) { _initial_info = info; } |
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202 |
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203 int caller_actual_parameters() const { return _caller_actual_parameters; } |
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204 |
| 0 | 205 // Accessors used by the code generator for the unpack stub. |
| 206 static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); } | |
| 207 static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); } | |
| 208 static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); } | |
| 209 static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); } | |
| 210 static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); } | |
| 211 static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); } | |
| 212 static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); } | |
| 213 static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); } | |
| 214 static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); } | |
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215 static int initial_info_offset_in_bytes() { return offset_of(UnrollBlock, _initial_info); } |
| 0 | 216 static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); } |
| 217 static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); } | |
| 218 | |
| 219 BasicType return_type() const { return _return_type; } | |
| 220 void print(); | |
| 221 }; | |
| 222 | |
| 223 //** Returns an UnrollBlock continuing information | |
| 224 // how to make room for the resulting interpreter frames. | |
| 225 // Called by assembly stub after execution has returned to | |
| 226 // deoptimized frame. | |
| 227 // @argument thread. Thread where stub_frame resides. | |
| 228 // @see OptoRuntime::deoptimization_fetch_unroll_info_C | |
| 229 static UnrollBlock* fetch_unroll_info(JavaThread* thread); | |
| 230 | |
| 231 //** Unpacks vframeArray onto execution stack | |
| 232 // Called by assembly stub after execution has returned to | |
| 233 // deoptimized frame and after the stack unrolling. | |
| 234 // @argument thread. Thread where stub_frame resides. | |
| 235 // @argument exec_mode. Determines how execution should be continuted in top frame. | |
| 236 // 0 means continue after current byte code | |
| 237 // 1 means exception has happened, handle exception | |
| 238 // 2 means reexecute current bytecode (for uncommon traps). | |
| 239 // @see OptoRuntime::deoptimization_unpack_frames_C | |
| 240 // Return BasicType of call return type, if any | |
| 241 static BasicType unpack_frames(JavaThread* thread, int exec_mode); | |
| 242 | |
| 243 // Cleans up deoptimization bits on thread after unpacking or in the | |
| 244 // case of an exception. | |
| 245 static void cleanup_deopt_info(JavaThread *thread, | |
| 246 vframeArray * array); | |
| 247 | |
| 248 // Restores callee saved values from deoptimized frame into oldest interpreter frame | |
| 249 // so caller of the deoptimized frame will get back the values it expects. | |
| 250 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); | |
| 251 | |
| 252 //** Performs an uncommon trap for compiled code. | |
| 253 // The top most compiler frame is converted into interpreter frames | |
| 254 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); | |
| 255 // Helper routine that enters the VM and may block | |
| 256 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); | |
| 257 | |
| 258 //** Deoptimizes the frame identified by id. | |
| 259 // Only called from VMDeoptimizeFrame | |
| 260 // @argument thread. Thread where stub_frame resides. | |
| 261 // @argument id. id of frame that should be deoptimized. | |
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262 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id, DeoptReason reason); |
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263 |
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264 // if thread is not the current thread then execute |
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265 // VM_DeoptimizeFrame otherwise deoptimize directly. |
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266 static void deoptimize_frame(JavaThread* thread, intptr_t* id, DeoptReason reason); |
| 0 | 267 |
| 268 // Statistics | |
| 269 static void gather_statistics(DeoptReason reason, DeoptAction action, | |
| 270 Bytecodes::Code bc = Bytecodes::_illegal); | |
| 271 static void print_statistics(); | |
| 272 | |
| 273 // How much room to adjust the last frame's SP by, to make space for | |
| 274 // the callee's interpreter frame (which expects locals to be next to | |
| 275 // incoming arguments) | |
| 276 static int last_frame_adjust(int callee_parameters, int callee_locals); | |
| 277 | |
| 278 // trap_request codes | |
| 279 static DeoptReason trap_request_reason(int trap_request) { | |
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280 if (trap_request < 0) |
| 0 | 281 return (DeoptReason) |
| 282 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); | |
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283 else |
| 0 | 284 // standard reason for unloaded CP entry |
| 285 return Reason_unloaded; | |
| 286 } | |
| 287 static DeoptAction trap_request_action(int trap_request) { | |
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288 if (trap_request < 0) |
| 0 | 289 return (DeoptAction) |
| 290 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); | |
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291 else |
| 0 | 292 // standard action for unloaded CP entry |
| 293 return _unloaded_action; | |
| 294 } | |
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295 static short trap_request_speculation_id(int trap_request) { |
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296 if (trap_request < 0) |
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297 return (DeoptAction) |
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298 ((~(trap_request) >> _speculation_id_shift) & right_n_bits(_speculation_id_bits)); |
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299 else |
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300 // standard action for unloaded CP entry |
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301 return 0; |
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302 } |
| 0 | 303 static int trap_request_index(int trap_request) { |
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304 if (trap_request < 0) |
| 0 | 305 return -1; |
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306 else |
| 0 | 307 return trap_request; |
| 308 } | |
| 309 static int make_trap_request(DeoptReason reason, DeoptAction action, | |
| 310 int index = -1) { | |
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311 #ifdef GRAALVM |
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312 assert(index == -1, "Graal does not use index"); |
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313 #endif |
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314 |
| 0 | 315 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); |
| 316 assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); | |
| 317 int trap_request; | |
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318 if (index != -1) |
| 0 | 319 trap_request = index; |
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320 else |
| 0 | 321 trap_request = (~(((reason) << _reason_shift) |
| 322 + ((action) << _action_shift))); | |
| 323 assert(reason == trap_request_reason(trap_request), "valid reason"); | |
| 324 assert(action == trap_request_action(trap_request), "valid action"); | |
| 325 assert(index == trap_request_index(trap_request), "valid index"); | |
| 326 return trap_request; | |
| 327 } | |
| 328 | |
| 329 // The trap_state stored in a MDO is decoded here. | |
| 330 // It records two items of information. | |
| 331 // reason: If a deoptimization happened here, what its reason was, | |
| 332 // or if there were multiple deopts with differing reasons. | |
| 333 // recompiled: If a deoptimization here triggered a recompilation. | |
| 334 // Note that not all reasons are recorded per-bci. | |
| 335 static DeoptReason trap_state_reason(int trap_state); | |
| 336 static int trap_state_has_reason(int trap_state, int reason); | |
| 337 static int trap_state_add_reason(int trap_state, int reason); | |
| 338 static bool trap_state_is_recompiled(int trap_state); | |
| 339 static int trap_state_set_recompiled(int trap_state, bool z); | |
| 340 static const char* format_trap_state(char* buf, size_t buflen, | |
| 341 int trap_state); | |
| 342 | |
| 343 static bool reason_is_recorded_per_bytecode(DeoptReason reason) { | |
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344 return reason > Reason_none && reason <= Reason_RECORDED_LIMIT; |
| 0 | 345 } |
| 346 | |
| 347 static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) { | |
| 348 if (reason_is_recorded_per_bytecode(reason)) | |
| 349 return reason; | |
| 350 else if (reason == Reason_div0_check) // null check due to divide-by-zero? | |
| 351 return Reason_null_check; // recorded per BCI as a null check | |
| 352 else | |
| 353 return Reason_none; | |
| 354 } | |
| 355 | |
| 356 static const char* trap_reason_name(int reason); | |
| 357 static const char* trap_action_name(int action); | |
| 358 // Format like reason='foo' action='bar' index='123'. | |
| 359 // This is suitable both for XML and for tty output. | |
| 360 static const char* format_trap_request(char* buf, size_t buflen, | |
| 361 int trap_request); | |
| 362 | |
| 363 static jint total_deoptimization_count(); | |
| 364 static jint deoptimization_count(DeoptReason reason); | |
| 365 | |
| 366 // JVMTI PopFrame support | |
| 367 | |
| 368 // Preserves incoming arguments to the popped frame when it is | |
| 369 // returning to a deoptimized caller | |
| 370 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); | |
| 371 | |
| 372 private: | |
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373 static MethodData* get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); |
| 0 | 374 // Update the mdo's count and per-BCI reason bits, returning previous state: |
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375 static ProfileData* query_update_method_data(MethodData* trap_mdo, |
| 0 | 376 int trap_bci, |
| 377 DeoptReason reason, | |
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378 bool update_total_trap_count, |
| 0 | 379 //outputs: |
| 380 uint& ret_this_trap_count, | |
| 381 bool& ret_maybe_prior_trap, | |
| 382 bool& ret_maybe_prior_recompile); | |
| 383 // class loading support for uncommon trap | |
| 384 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); | |
| 385 static void load_class_by_index(constantPoolHandle constant_pool, int index); | |
| 386 | |
| 387 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); | |
| 388 | |
| 389 static DeoptAction _unloaded_action; // == Action_reinterpret; | |
| 390 static const char* _trap_reason_name[Reason_LIMIT]; | |
| 391 static const char* _trap_action_name[Action_LIMIT]; | |
| 392 | |
| 393 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; | |
| 394 // Note: Histogram array size is 1-2 Kb. | |
| 395 | |
| 396 public: | |
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397 static void update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason); |
| 0 | 398 }; |
| 399 | |
| 400 class DeoptimizationMarker : StackObj { // for profiling | |
| 401 static bool _is_active; | |
| 402 public: | |
| 403 DeoptimizationMarker() { _is_active = true; } | |
| 404 ~DeoptimizationMarker() { _is_active = false; } | |
| 405 static bool is_active() { return _is_active; } | |
| 406 }; | |
| 1972 | 407 |
| 408 #endif // SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP |