ciMethodData.cpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 2001, 2012, 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 "precompiled.hpp" 26#include "ci/ciMetadata.hpp" 27#include "ci/ciMethodData.hpp" 28#include "ci/ciUtilities.hpp" 29#include "memory/allocation.inline.hpp" 30#include "memory/resourceArea.hpp" 31#include "runtime/deoptimization.hpp" 32#include "utilities/copy.hpp" 33 34// ciMethodData 35 36// ------------------------------------------------------------------ 37// ciMethodData::ciMethodData 38// 39ciMethodData::ciMethodData(MethodData* md) : ciMetadata(md) { 40 assert(md != NULL, "no null method data"); 41 Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord)); 42 _data = NULL; 43 _data_size = 0; 44 _extra_data_size = 0; 45 _current_mileage = 0; 46 _invocation_counter = 0; 47 _backedge_counter = 0; 48 _state = empty_state; 49 _saw_free_extra_data = false; 50 // Set an initial hint. Don't use set_hint_di() because 51 // first_di() may be out of bounds if data_size is 0. 52 _hint_di = first_di(); 53 // Initialize the escape information (to "don't know."); 54 _eflags = _arg_local = _arg_stack = _arg_returned = 0; 55} 56 57// ------------------------------------------------------------------ 58// ciMethodData::ciMethodData 59// 60// No MethodData*. 61ciMethodData::ciMethodData() : ciMetadata(NULL) { 62 Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord)); 63 _data = NULL; 64 _data_size = 0; 65 _extra_data_size = 0; 66 _current_mileage = 0; 67 _invocation_counter = 0; 68 _backedge_counter = 0; 69 _state = empty_state; 70 _saw_free_extra_data = false; 71 // Set an initial hint. Don't use set_hint_di() because 72 // first_di() may be out of bounds if data_size is 0. 73 _hint_di = first_di(); 74 // Initialize the escape information (to "don't know."); 75 _eflags = _arg_local = _arg_stack = _arg_returned = 0; 76} 77 78void ciMethodData::load_data() { 79 MethodData* mdo = get_MethodData(); 80 if (mdo == NULL) return; 81 82 // To do: don't copy the data if it is not "ripe" -- require a minimum # 83 // of invocations. 84 85 // Snapshot the data -- actually, take an approximate snapshot of 86 // the data. Any concurrently executing threads may be changing the 87 // data as we copy it. 88 Copy::disjoint_words((HeapWord*) mdo, 89 (HeapWord*) &_orig, 90 sizeof(_orig) / HeapWordSize); 91 Arena* arena = CURRENT_ENV->arena(); 92 _data_size = mdo->data_size(); 93 _extra_data_size = mdo->extra_data_size(); 94 int total_size = _data_size + _extra_data_size; 95 _data = (intptr_t *) arena->Amalloc(total_size); 96 Copy::disjoint_words((HeapWord*) mdo->data_base(), (HeapWord*) _data, total_size / HeapWordSize); 97 98 // Traverse the profile data, translating any oops into their 99 // ci equivalents. 100 ResourceMark rm; 101 ciProfileData* ci_data = first_data(); 102 ProfileData* data = mdo->first_data(); 103 while (is_valid(ci_data)) { 104 ci_data->translate_from(data); 105 ci_data = next_data(ci_data); 106 data = mdo->next_data(data); 107 } 108 // Note: Extra data are all BitData, and do not need translation. 109 _current_mileage = MethodData::mileage_of(mdo->method()); 110 _invocation_counter = mdo->invocation_count(); 111 _backedge_counter = mdo->backedge_count(); 112 _state = mdo->is_mature()? mature_state: immature_state; 113 114 _eflags = mdo->eflags(); 115 _arg_local = mdo->arg_local(); 116 _arg_stack = mdo->arg_stack(); 117 _arg_returned = mdo->arg_returned(); 118} 119 120void ciReceiverTypeData::translate_receiver_data_from(ProfileData* data) { 121 for (uint row = 0; row < row_limit(); row++) { 122 Klass* k = data->as_ReceiverTypeData()->receiver(row); 123 if (k != NULL) { 124 ciKlass* klass = CURRENT_ENV->get_klass(k); 125 set_receiver(row, klass); 126 } 127 } 128} 129 130 131// Get the data at an arbitrary (sort of) data index. 132ciProfileData* ciMethodData::data_at(int data_index) { 133 if (out_of_bounds(data_index)) { 134 return NULL; 135 } 136 DataLayout* data_layout = data_layout_at(data_index); 137 138 switch (data_layout->tag()) { 139 case DataLayout::no_tag: 140 default: 141 ShouldNotReachHere(); 142 return NULL; 143 case DataLayout::bit_data_tag: 144 return new ciBitData(data_layout); 145 case DataLayout::counter_data_tag: 146 return new ciCounterData(data_layout); 147 case DataLayout::jump_data_tag: 148 return new ciJumpData(data_layout); 149 case DataLayout::receiver_type_data_tag: 150 return new ciReceiverTypeData(data_layout); 151 case DataLayout::virtual_call_data_tag: 152 return new ciVirtualCallData(data_layout); 153 case DataLayout::ret_data_tag: 154 return new ciRetData(data_layout); 155 case DataLayout::branch_data_tag: 156 return new ciBranchData(data_layout); 157 case DataLayout::multi_branch_data_tag: 158 return new ciMultiBranchData(data_layout); 159 case DataLayout::arg_info_data_tag: 160 return new ciArgInfoData(data_layout); 161 }; 162} 163 164// Iteration over data. 165ciProfileData* ciMethodData::next_data(ciProfileData* current) { 166 int current_index = dp_to_di(current->dp()); 167 int next_index = current_index + current->size_in_bytes(); 168 ciProfileData* next = data_at(next_index); 169 return next; 170} 171 172// Translate a bci to its corresponding data, or NULL. 173ciProfileData* ciMethodData::bci_to_data(int bci) { 174 ciProfileData* data = data_before(bci); 175 for ( ; is_valid(data); data = next_data(data)) { 176 if (data->bci() == bci) { 177 set_hint_di(dp_to_di(data->dp())); 178 return data; 179 } else if (data->bci() > bci) { 180 break; 181 } 182 } 183 // bci_to_extra_data(bci) ... 184 DataLayout* dp = data_layout_at(data_size()); 185 DataLayout* end = data_layout_at(data_size() + extra_data_size()); 186 for (; dp < end; dp = MethodData::next_extra(dp)) { 187 if (dp->tag() == DataLayout::no_tag) { 188 _saw_free_extra_data = true; // observed an empty slot (common case) 189 return NULL; 190 } 191 if (dp->tag() == DataLayout::arg_info_data_tag) { 192 break; // ArgInfoData is at the end of extra data section. 193 } 194 if (dp->bci() == bci) { 195 assert(dp->tag() == DataLayout::bit_data_tag, "sane"); 196 return new ciBitData(dp); 197 } 198 } 199 return NULL; 200} 201 202// Conservatively decode the trap_state of a ciProfileData. 203int ciMethodData::has_trap_at(ciProfileData* data, int reason) { 204 typedef Deoptimization::DeoptReason DR_t; 205 int per_bc_reason 206 = Deoptimization::reason_recorded_per_bytecode_if_any((DR_t) reason); 207 if (trap_count(reason) == 0) { 208 // Impossible for this trap to have occurred, regardless of trap_state. 209 // Note: This happens if the MDO is empty. 210 return 0; 211 } else if (per_bc_reason == Deoptimization::Reason_none) { 212 // We cannot conclude anything; a trap happened somewhere, maybe here. 213 return -1; 214 } else if (data == NULL) { 215 // No profile here, not even an extra_data record allocated on the fly. 216 // If there are empty extra_data records, and there had been a trap, 217 // there would have been a non-null data pointer. If there are no 218 // free extra_data records, we must return a conservative -1. 219 if (_saw_free_extra_data) 220 return 0; // Q.E.D. 221 else 222 return -1; // bail with a conservative answer 223 } else { 224 return Deoptimization::trap_state_has_reason(data->trap_state(), per_bc_reason); 225 } 226} 227 228int ciMethodData::trap_recompiled_at(ciProfileData* data) { 229 if (data == NULL) { 230 return (_saw_free_extra_data? 0: -1); // (see previous method) 231 } else { 232 return Deoptimization::trap_state_is_recompiled(data->trap_state())? 1: 0; 233 } 234} 235 236void ciMethodData::clear_escape_info() { 237 VM_ENTRY_MARK; 238 MethodData* mdo = get_MethodData(); 239 if (mdo != NULL) { 240 mdo->clear_escape_info(); 241 ArgInfoData *aid = arg_info(); 242 int arg_count = (aid == NULL) ? 0 : aid->number_of_args(); 243 for (int i = 0; i < arg_count; i++) { 244 set_arg_modified(i, 0); 245 } 246 } 247 _eflags = _arg_local = _arg_stack = _arg_returned = 0; 248} 249 250// copy our escape info to the MethodData* if it exists 251void ciMethodData::update_escape_info() { 252 VM_ENTRY_MARK; 253 MethodData* mdo = get_MethodData(); 254 if ( mdo != NULL) { 255 mdo->set_eflags(_eflags); 256 mdo->set_arg_local(_arg_local); 257 mdo->set_arg_stack(_arg_stack); 258 mdo->set_arg_returned(_arg_returned); 259 int arg_count = mdo->method()->size_of_parameters(); 260 for (int i = 0; i < arg_count; i++) { 261 mdo->set_arg_modified(i, arg_modified(i)); 262 } 263 } 264} 265 266void ciMethodData::set_compilation_stats(short loops, short blocks) { 267 VM_ENTRY_MARK; 268 MethodData* mdo = get_MethodData(); 269 if (mdo != NULL) { 270 mdo->set_num_loops(loops); 271 mdo->set_num_blocks(blocks); 272 } 273} 274 275void ciMethodData::set_would_profile(bool p) { 276 VM_ENTRY_MARK; 277 MethodData* mdo = get_MethodData(); 278 if (mdo != NULL) { 279 mdo->set_would_profile(p); 280 } 281} 282 283bool ciMethodData::has_escape_info() { 284 return eflag_set(MethodData::estimated); 285} 286 287void ciMethodData::set_eflag(MethodData::EscapeFlag f) { 288 set_bits(_eflags, f); 289} 290 291void ciMethodData::clear_eflag(MethodData::EscapeFlag f) { 292 clear_bits(_eflags, f); 293} 294 295bool ciMethodData::eflag_set(MethodData::EscapeFlag f) const { 296 return mask_bits(_eflags, f) != 0; 297} 298 299void ciMethodData::set_arg_local(int i) { 300 set_nth_bit(_arg_local, i); 301} 302 303void ciMethodData::set_arg_stack(int i) { 304 set_nth_bit(_arg_stack, i); 305} 306 307void ciMethodData::set_arg_returned(int i) { 308 set_nth_bit(_arg_returned, i); 309} 310 311void ciMethodData::set_arg_modified(int arg, uint val) { 312 ArgInfoData *aid = arg_info(); 313 if (aid == NULL) 314 return; 315 assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number"); 316 aid->set_arg_modified(arg, val); 317} 318 319bool ciMethodData::is_arg_local(int i) const { 320 return is_set_nth_bit(_arg_local, i); 321} 322 323bool ciMethodData::is_arg_stack(int i) const { 324 return is_set_nth_bit(_arg_stack, i); 325} 326 327bool ciMethodData::is_arg_returned(int i) const { 328 return is_set_nth_bit(_arg_returned, i); 329} 330 331uint ciMethodData::arg_modified(int arg) const { 332 ArgInfoData *aid = arg_info(); 333 if (aid == NULL) 334 return 0; 335 assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number"); 336 return aid->arg_modified(arg); 337} 338 339ByteSize ciMethodData::offset_of_slot(ciProfileData* data, ByteSize slot_offset_in_data) { 340 // Get offset within MethodData* of the data array 341 ByteSize data_offset = MethodData::data_offset(); 342 343 // Get cell offset of the ProfileData within data array 344 int cell_offset = dp_to_di(data->dp()); 345 346 // Add in counter_offset, the # of bytes into the ProfileData of counter or flag 347 int offset = in_bytes(data_offset) + cell_offset + in_bytes(slot_offset_in_data); 348 349 return in_ByteSize(offset); 350} 351 352ciArgInfoData *ciMethodData::arg_info() const { 353 // Should be last, have to skip all traps. 354 DataLayout* dp = data_layout_at(data_size()); 355 DataLayout* end = data_layout_at(data_size() + extra_data_size()); 356 for (; dp < end; dp = MethodData::next_extra(dp)) { 357 if (dp->tag() == DataLayout::arg_info_data_tag) 358 return new ciArgInfoData(dp); 359 } 360 return NULL; 361} 362 363 364// Implementation of the print method. 365void ciMethodData::print_impl(outputStream* st) { 366 ciMetadata::print_impl(st); 367} 368 369#ifndef PRODUCT 370void ciMethodData::print() { 371 print_data_on(tty); 372} 373 374void ciMethodData::print_data_on(outputStream* st) { 375 ResourceMark rm; 376 ciProfileData* data; 377 for (data = first_data(); is_valid(data); data = next_data(data)) { 378 st->print("%d", dp_to_di(data->dp())); 379 st->fill_to(6); 380 data->print_data_on(st); 381 } 382 st->print_cr("--- Extra data:"); 383 DataLayout* dp = data_layout_at(data_size()); 384 DataLayout* end = data_layout_at(data_size() + extra_data_size()); 385 for (; dp < end; dp = MethodData::next_extra(dp)) { 386 if (dp->tag() == DataLayout::no_tag) continue; 387 if (dp->tag() == DataLayout::bit_data_tag) { 388 data = new BitData(dp); 389 } else { 390 assert(dp->tag() == DataLayout::arg_info_data_tag, "must be BitData or ArgInfo"); 391 data = new ciArgInfoData(dp); 392 dp = end; // ArgInfoData is at the end of extra data section. 393 } 394 st->print("%d", dp_to_di(data->dp())); 395 st->fill_to(6); 396 data->print_data_on(st); 397 } 398} 399 400void ciReceiverTypeData::print_receiver_data_on(outputStream* st) { 401 uint row; 402 int entries = 0; 403 for (row = 0; row < row_limit(); row++) { 404 if (receiver(row) != NULL) entries++; 405 } 406 st->print_cr("count(%u) entries(%u)", count(), entries); 407 for (row = 0; row < row_limit(); row++) { 408 if (receiver(row) != NULL) { 409 tab(st); 410 receiver(row)->print_name_on(st); 411 st->print_cr("(%u)", receiver_count(row)); 412 } 413 } 414} 415 416void ciReceiverTypeData::print_data_on(outputStream* st) { 417 print_shared(st, "ciReceiverTypeData"); 418 print_receiver_data_on(st); 419} 420 421void ciVirtualCallData::print_data_on(outputStream* st) { 422 print_shared(st, "ciVirtualCallData"); 423 rtd_super()->print_receiver_data_on(st); 424} 425#endif 426