ciMethodData.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_ciMethodData.cpp.incl" 27 28// ciMethodData 29 30// ------------------------------------------------------------------ 31// ciMethodData::ciMethodData 32// 33ciMethodData::ciMethodData(methodDataHandle h_md) : ciObject(h_md) { 34 assert(h_md() != NULL, "no null method data"); 35 Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord)); 36 _data = NULL; 37 _data_size = 0; 38 _extra_data_size = 0; 39 _current_mileage = 0; 40 _state = empty_state; 41 _saw_free_extra_data = false; 42 // Set an initial hint. Don't use set_hint_di() because 43 // first_di() may be out of bounds if data_size is 0. 44 _hint_di = first_di(); 45 // Initialize the escape information (to "don't know."); 46 _eflags = _arg_local = _arg_stack = _arg_returned = 0; 47} 48 49// ------------------------------------------------------------------ 50// ciMethodData::ciMethodData 51// 52// No methodDataOop. 53ciMethodData::ciMethodData() : ciObject() { 54 Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord)); 55 _data = NULL; 56 _data_size = 0; 57 _extra_data_size = 0; 58 _current_mileage = 0; 59 _state = empty_state; 60 _saw_free_extra_data = false; 61 // Set an initial hint. Don't use set_hint_di() because 62 // first_di() may be out of bounds if data_size is 0. 63 _hint_di = first_di(); 64 // Initialize the escape information (to "don't know."); 65 _eflags = _arg_local = _arg_stack = _arg_returned = 0; 66} 67 68void ciMethodData::load_data() { 69 methodDataOop mdo = get_methodDataOop(); 70 if (mdo == NULL) return; 71 72 // To do: don't copy the data if it is not "ripe" -- require a minimum # 73 // of invocations. 74 75 // Snapshot the data -- actually, take an approximate snapshot of 76 // the data. Any concurrently executing threads may be changing the 77 // data as we copy it. 78 int skip_header = oopDesc::header_size(); 79 Copy::disjoint_words((HeapWord*) mdo + skip_header, 80 (HeapWord*) &_orig + skip_header, 81 sizeof(_orig) / HeapWordSize - skip_header); 82 DEBUG_ONLY(*_orig.adr_method() = NULL); // no dangling oops, please 83 Arena* arena = CURRENT_ENV->arena(); 84 _data_size = mdo->data_size(); 85 _extra_data_size = mdo->extra_data_size(); 86 int total_size = _data_size + _extra_data_size; 87 _data = (intptr_t *) arena->Amalloc(total_size); 88 Copy::disjoint_words((HeapWord*) mdo->data_base(), (HeapWord*) _data, total_size / HeapWordSize); 89 90 // Traverse the profile data, translating any oops into their 91 // ci equivalents. 92 ResourceMark rm; 93 ciProfileData* ci_data = first_data(); 94 ProfileData* data = mdo->first_data(); 95 while (is_valid(ci_data)) { 96 ci_data->translate_from(data); 97 ci_data = next_data(ci_data); 98 data = mdo->next_data(data); 99 } 100 // Note: Extra data are all BitData, and do not need translation. 101 _current_mileage = methodDataOopDesc::mileage_of(mdo->method()); 102 _state = mdo->is_mature()? mature_state: immature_state; 103 104 _eflags = mdo->eflags(); 105 _arg_local = mdo->arg_local(); 106 _arg_stack = mdo->arg_stack(); 107 _arg_returned = mdo->arg_returned(); 108} 109 110void ciReceiverTypeData::translate_receiver_data_from(ProfileData* data) { 111 for (uint row = 0; row < row_limit(); row++) { 112 klassOop k = data->as_ReceiverTypeData()->receiver(row); 113 if (k != NULL) { 114 ciKlass* klass = CURRENT_ENV->get_object(k)->as_klass(); 115 set_receiver(row, klass); 116 } 117 } 118} 119 120 121// Get the data at an arbitrary (sort of) data index. 122ciProfileData* ciMethodData::data_at(int data_index) { 123 if (out_of_bounds(data_index)) { 124 return NULL; 125 } 126 DataLayout* data_layout = data_layout_at(data_index); 127 128 switch (data_layout->tag()) { 129 case DataLayout::no_tag: 130 default: 131 ShouldNotReachHere(); 132 return NULL; 133 case DataLayout::bit_data_tag: 134 return new ciBitData(data_layout); 135 case DataLayout::counter_data_tag: 136 return new ciCounterData(data_layout); 137 case DataLayout::jump_data_tag: 138 return new ciJumpData(data_layout); 139 case DataLayout::receiver_type_data_tag: 140 return new ciReceiverTypeData(data_layout); 141 case DataLayout::virtual_call_data_tag: 142 return new ciVirtualCallData(data_layout); 143 case DataLayout::ret_data_tag: 144 return new ciRetData(data_layout); 145 case DataLayout::branch_data_tag: 146 return new ciBranchData(data_layout); 147 case DataLayout::multi_branch_data_tag: 148 return new ciMultiBranchData(data_layout); 149 case DataLayout::arg_info_data_tag: 150 return new ciArgInfoData(data_layout); 151 }; 152} 153 154// Iteration over data. 155ciProfileData* ciMethodData::next_data(ciProfileData* current) { 156 int current_index = dp_to_di(current->dp()); 157 int next_index = current_index + current->size_in_bytes(); 158 ciProfileData* next = data_at(next_index); 159 return next; 160} 161 162// Translate a bci to its corresponding data, or NULL. 163ciProfileData* ciMethodData::bci_to_data(int bci) { 164 ciProfileData* data = data_before(bci); 165 for ( ; is_valid(data); data = next_data(data)) { 166 if (data->bci() == bci) { 167 set_hint_di(dp_to_di(data->dp())); 168 return data; 169 } else if (data->bci() > bci) { 170 break; 171 } 172 } 173 // bci_to_extra_data(bci) ... 174 DataLayout* dp = data_layout_at(data_size()); 175 DataLayout* end = data_layout_at(data_size() + extra_data_size()); 176 for (; dp < end; dp = methodDataOopDesc::next_extra(dp)) { 177 if (dp->tag() == DataLayout::no_tag) { 178 _saw_free_extra_data = true; // observed an empty slot (common case) 179 return NULL; 180 } 181 if (dp->tag() == DataLayout::arg_info_data_tag) { 182 break; // ArgInfoData is at the end of extra data section. 183 } 184 if (dp->bci() == bci) { 185 assert(dp->tag() == DataLayout::bit_data_tag, "sane"); 186 return new ciBitData(dp); 187 } 188 } 189 return NULL; 190} 191 192// Conservatively decode the trap_state of a ciProfileData. 193int ciMethodData::has_trap_at(ciProfileData* data, int reason) { 194 typedef Deoptimization::DeoptReason DR_t; 195 int per_bc_reason 196 = Deoptimization::reason_recorded_per_bytecode_if_any((DR_t) reason); 197 if (trap_count(reason) == 0) { 198 // Impossible for this trap to have occurred, regardless of trap_state. 199 // Note: This happens if the MDO is empty. 200 return 0; 201 } else if (per_bc_reason == Deoptimization::Reason_none) { 202 // We cannot conclude anything; a trap happened somewhere, maybe here. 203 return -1; 204 } else if (data == NULL) { 205 // No profile here, not even an extra_data record allocated on the fly. 206 // If there are empty extra_data records, and there had been a trap, 207 // there would have been a non-null data pointer. If there are no 208 // free extra_data records, we must return a conservative -1. 209 if (_saw_free_extra_data) 210 return 0; // Q.E.D. 211 else 212 return -1; // bail with a conservative answer 213 } else { 214 return Deoptimization::trap_state_has_reason(data->trap_state(), per_bc_reason); 215 } 216} 217 218int ciMethodData::trap_recompiled_at(ciProfileData* data) { 219 if (data == NULL) { 220 return (_saw_free_extra_data? 0: -1); // (see previous method) 221 } else { 222 return Deoptimization::trap_state_is_recompiled(data->trap_state())? 1: 0; 223 } 224} 225 226void ciMethodData::clear_escape_info() { 227 VM_ENTRY_MARK; 228 methodDataOop mdo = get_methodDataOop(); 229 if (mdo != NULL) { 230 mdo->clear_escape_info(); 231 ArgInfoData *aid = arg_info(); 232 int arg_count = (aid == NULL) ? 0 : aid->number_of_args(); 233 for (int i = 0; i < arg_count; i++) { 234 set_arg_modified(i, 0); 235 } 236 } 237 _eflags = _arg_local = _arg_stack = _arg_returned = 0; 238} 239 240// copy our escape info to the methodDataOop if it exists 241void ciMethodData::update_escape_info() { 242 VM_ENTRY_MARK; 243 methodDataOop mdo = get_methodDataOop(); 244 if ( mdo != NULL) { 245 mdo->set_eflags(_eflags); 246 mdo->set_arg_local(_arg_local); 247 mdo->set_arg_stack(_arg_stack); 248 mdo->set_arg_returned(_arg_returned); 249 int arg_count = mdo->method()->size_of_parameters(); 250 for (int i = 0; i < arg_count; i++) { 251 mdo->set_arg_modified(i, arg_modified(i)); 252 } 253 } 254} 255 256bool ciMethodData::has_escape_info() { 257 return eflag_set(methodDataOopDesc::estimated); 258} 259 260void ciMethodData::set_eflag(methodDataOopDesc::EscapeFlag f) { 261 set_bits(_eflags, f); 262} 263 264void ciMethodData::clear_eflag(methodDataOopDesc::EscapeFlag f) { 265 clear_bits(_eflags, f); 266} 267 268bool ciMethodData::eflag_set(methodDataOopDesc::EscapeFlag f) const { 269 return mask_bits(_eflags, f) != 0; 270} 271 272void ciMethodData::set_arg_local(int i) { 273 set_nth_bit(_arg_local, i); 274} 275 276void ciMethodData::set_arg_stack(int i) { 277 set_nth_bit(_arg_stack, i); 278} 279 280void ciMethodData::set_arg_returned(int i) { 281 set_nth_bit(_arg_returned, i); 282} 283 284void ciMethodData::set_arg_modified(int arg, uint val) { 285 ArgInfoData *aid = arg_info(); 286 if (aid == NULL) 287 return; 288 assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number"); 289 aid->set_arg_modified(arg, val); 290} 291 292bool ciMethodData::is_arg_local(int i) const { 293 return is_set_nth_bit(_arg_local, i); 294} 295 296bool ciMethodData::is_arg_stack(int i) const { 297 return is_set_nth_bit(_arg_stack, i); 298} 299 300bool ciMethodData::is_arg_returned(int i) const { 301 return is_set_nth_bit(_arg_returned, i); 302} 303 304uint ciMethodData::arg_modified(int arg) const { 305 ArgInfoData *aid = arg_info(); 306 if (aid == NULL) 307 return 0; 308 assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number"); 309 return aid->arg_modified(arg); 310} 311 312ByteSize ciMethodData::offset_of_slot(ciProfileData* data, ByteSize slot_offset_in_data) { 313 // Get offset within methodDataOop of the data array 314 ByteSize data_offset = methodDataOopDesc::data_offset(); 315 316 // Get cell offset of the ProfileData within data array 317 int cell_offset = dp_to_di(data->dp()); 318 319 // Add in counter_offset, the # of bytes into the ProfileData of counter or flag 320 int offset = in_bytes(data_offset) + cell_offset + in_bytes(slot_offset_in_data); 321 322 return in_ByteSize(offset); 323} 324 325ciArgInfoData *ciMethodData::arg_info() const { 326 // Should be last, have to skip all traps. 327 DataLayout* dp = data_layout_at(data_size()); 328 DataLayout* end = data_layout_at(data_size() + extra_data_size()); 329 for (; dp < end; dp = methodDataOopDesc::next_extra(dp)) { 330 if (dp->tag() == DataLayout::arg_info_data_tag) 331 return new ciArgInfoData(dp); 332 } 333 return NULL; 334} 335 336 337// Implementation of the print method. 338void ciMethodData::print_impl(outputStream* st) { 339 ciObject::print_impl(st); 340} 341 342#ifndef PRODUCT 343void ciMethodData::print() { 344 print_data_on(tty); 345} 346 347void ciMethodData::print_data_on(outputStream* st) { 348 ResourceMark rm; 349 ciProfileData* data; 350 for (data = first_data(); is_valid(data); data = next_data(data)) { 351 st->print("%d", dp_to_di(data->dp())); 352 st->fill_to(6); 353 data->print_data_on(st); 354 } 355 st->print_cr("--- Extra data:"); 356 DataLayout* dp = data_layout_at(data_size()); 357 DataLayout* end = data_layout_at(data_size() + extra_data_size()); 358 for (; dp < end; dp = methodDataOopDesc::next_extra(dp)) { 359 if (dp->tag() == DataLayout::no_tag) continue; 360 if (dp->tag() == DataLayout::bit_data_tag) { 361 data = new BitData(dp); 362 } else { 363 assert(dp->tag() == DataLayout::arg_info_data_tag, "must be BitData or ArgInfo"); 364 data = new ciArgInfoData(dp); 365 dp = end; // ArgInfoData is at the end of extra data section. 366 } 367 st->print("%d", dp_to_di(data->dp())); 368 st->fill_to(6); 369 data->print_data_on(st); 370 } 371} 372 373void ciReceiverTypeData::print_receiver_data_on(outputStream* st) { 374 uint row; 375 int entries = 0; 376 for (row = 0; row < row_limit(); row++) { 377 if (receiver(row) != NULL) entries++; 378 } 379 st->print_cr("count(%u) entries(%u)", count(), entries); 380 for (row = 0; row < row_limit(); row++) { 381 if (receiver(row) != NULL) { 382 tab(st); 383 receiver(row)->print_name_on(st); 384 st->print_cr("(%u)", receiver_count(row)); 385 } 386 } 387} 388 389void ciReceiverTypeData::print_data_on(outputStream* st) { 390 print_shared(st, "ciReceiverTypeData"); 391 print_receiver_data_on(st); 392} 393 394void ciVirtualCallData::print_data_on(outputStream* st) { 395 print_shared(st, "ciVirtualCallData"); 396 rtd_super()->print_receiver_data_on(st); 397} 398#endif 399