Mercurial > hg > truffle
annotate src/share/vm/ci/ciMethodBlocks.cpp @ 14518:d8041d695d19
Merged with jdk9/dev/hotspot changeset 3812c088b945
| author | twisti |
|---|---|
| date | Tue, 11 Mar 2014 18:45:59 -0700 |
| parents | 8012aa3ccede |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2142 | 2 * Copyright (c) 2006, 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 #include "precompiled.hpp" |
| 26 #include "ci/ciMethodBlocks.hpp" | |
| 27 #include "ci/ciStreams.hpp" | |
| 28 #include "interpreter/bytecode.hpp" | |
| 29 #include "utilities/copy.hpp" | |
| 0 | 30 |
| 31 // ciMethodBlocks | |
| 32 | |
| 33 | |
| 34 | |
| 35 ciBlock *ciMethodBlocks::block_containing(int bci) { | |
| 36 ciBlock *blk = _bci_to_block[bci]; | |
| 37 return blk; | |
| 38 } | |
| 39 | |
| 40 bool ciMethodBlocks::is_block_start(int bci) { | |
| 41 assert(bci >=0 && bci < _code_size, "valid bytecode range"); | |
| 42 ciBlock *b = _bci_to_block[bci]; | |
| 43 assert(b != NULL, "must have block for bytecode"); | |
| 44 return b->start_bci() == bci; | |
| 45 } | |
| 46 | |
| 47 // ------------------------------------------------------------------ | |
| 48 // ciMethodBlocks::split_block_at | |
| 49 // | |
| 50 // Split the block spanning bci into two separate ranges. The former | |
| 51 // block becomes the second half and a new range is created for the | |
| 52 // first half. Returns the range beginning at bci. | |
| 53 ciBlock *ciMethodBlocks::split_block_at(int bci) { | |
| 54 ciBlock *former_block = block_containing(bci); | |
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55 ciBlock *new_block = new(_arena) ciBlock(_method, _num_blocks++, former_block->start_bci()); |
| 0 | 56 _blocks->append(new_block); |
| 57 assert(former_block != NULL, "must not be NULL"); | |
| 58 new_block->set_limit_bci(bci); | |
| 59 former_block->set_start_bci(bci); | |
| 60 for (int pos=bci-1; pos >= 0; pos--) { | |
| 61 ciBlock *current_block = block_containing(pos); | |
| 62 if (current_block == former_block) { | |
| 63 // Replace it. | |
| 64 _bci_to_block[pos] = new_block; | |
| 65 } else if (current_block == NULL) { | |
| 66 // Non-bytecode start. Skip. | |
| 67 continue; | |
| 68 } else { | |
| 69 // We are done with our backwards walk | |
| 70 break; | |
| 71 } | |
| 72 } | |
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73 // Move an exception handler information if needed. |
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74 if (former_block->is_handler()) { |
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75 int ex_start = former_block->ex_start_bci(); |
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76 int ex_end = former_block->ex_limit_bci(); |
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77 new_block->set_exception_range(ex_start, ex_end); |
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78 // Clear information in former_block. |
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79 former_block->clear_exception_handler(); |
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80 } |
| 0 | 81 return former_block; |
| 82 } | |
| 83 | |
| 84 ciBlock *ciMethodBlocks::make_block_at(int bci) { | |
| 85 ciBlock *cb = block_containing(bci); | |
| 86 if (cb == NULL ) { | |
| 87 // This is our first time visiting this bytecode. Create | |
| 88 // a fresh block and assign it this starting point. | |
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89 ciBlock *nb = new(_arena) ciBlock(_method, _num_blocks++, bci); |
| 0 | 90 _blocks->append(nb); |
| 91 _bci_to_block[bci] = nb; | |
| 92 return nb; | |
| 93 } else if (cb->start_bci() == bci) { | |
| 94 // The block begins at bci. Simply return it. | |
| 95 return cb; | |
| 96 } else { | |
| 97 // We have already created a block containing bci but | |
| 98 // not starting at bci. This existing block needs to | |
| 99 // be split into two. | |
| 100 return split_block_at(bci); | |
| 101 } | |
| 102 } | |
| 103 | |
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104 ciBlock *ciMethodBlocks::make_dummy_block() { |
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105 ciBlock *dum = new(_arena) ciBlock(_method, -1, 0); |
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106 return dum; |
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107 } |
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108 |
| 0 | 109 void ciMethodBlocks::do_analysis() { |
| 110 ciBytecodeStream s(_method); | |
| 111 ciBlock *cur_block = block_containing(0); | |
| 112 int limit_bci = _method->code_size(); | |
| 113 | |
| 114 while (s.next() != ciBytecodeStream::EOBC()) { | |
| 115 int bci = s.cur_bci(); | |
| 116 // Determine if a new block has been made at the current bci. If | |
| 117 // this block differs from our current range, switch to the new | |
| 118 // one and end the old one. | |
| 119 assert(cur_block != NULL, "must always have a current block"); | |
| 120 ciBlock *new_block = block_containing(bci); | |
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121 if (new_block == NULL || new_block == cur_block) { |
| 0 | 122 // We have not marked this bci as the start of a new block. |
| 123 // Keep interpreting the current_range. | |
| 124 _bci_to_block[bci] = cur_block; | |
| 125 } else { | |
| 126 cur_block->set_limit_bci(bci); | |
| 127 cur_block = new_block; | |
| 128 } | |
| 129 | |
| 130 switch (s.cur_bc()) { | |
| 131 case Bytecodes::_ifeq : | |
| 132 case Bytecodes::_ifne : | |
| 133 case Bytecodes::_iflt : | |
| 134 case Bytecodes::_ifge : | |
| 135 case Bytecodes::_ifgt : | |
| 136 case Bytecodes::_ifle : | |
| 137 case Bytecodes::_if_icmpeq : | |
| 138 case Bytecodes::_if_icmpne : | |
| 139 case Bytecodes::_if_icmplt : | |
| 140 case Bytecodes::_if_icmpge : | |
| 141 case Bytecodes::_if_icmpgt : | |
| 142 case Bytecodes::_if_icmple : | |
| 143 case Bytecodes::_if_acmpeq : | |
| 144 case Bytecodes::_if_acmpne : | |
| 145 case Bytecodes::_ifnull : | |
| 146 case Bytecodes::_ifnonnull : | |
| 147 { | |
| 148 cur_block->set_control_bci(bci); | |
| 149 ciBlock *fall_through = make_block_at(s.next_bci()); | |
| 150 int dest_bci = s.get_dest(); | |
| 151 ciBlock *dest = make_block_at(dest_bci); | |
| 152 break; | |
| 153 } | |
| 154 | |
| 155 case Bytecodes::_goto : | |
| 156 { | |
| 157 cur_block->set_control_bci(bci); | |
| 158 if (s.next_bci() < limit_bci) { | |
| 159 (void) make_block_at(s.next_bci()); | |
| 160 } | |
| 161 int dest_bci = s.get_dest(); | |
| 162 ciBlock *dest = make_block_at(dest_bci); | |
| 163 break; | |
| 164 } | |
| 165 | |
| 166 case Bytecodes::_jsr : | |
| 167 { | |
| 168 cur_block->set_control_bci(bci); | |
| 169 ciBlock *ret = make_block_at(s.next_bci()); | |
| 170 int dest_bci = s.get_dest(); | |
| 171 ciBlock *dest = make_block_at(dest_bci); | |
| 172 break; | |
| 173 } | |
| 174 | |
| 175 case Bytecodes::_tableswitch : | |
| 176 { | |
| 177 cur_block->set_control_bci(bci); | |
| 2142 | 178 Bytecode_tableswitch sw(&s); |
| 179 int len = sw.length(); | |
| 0 | 180 ciBlock *dest; |
| 181 int dest_bci; | |
| 182 for (int i = 0; i < len; i++) { | |
| 2142 | 183 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
| 0 | 184 dest = make_block_at(dest_bci); |
| 185 } | |
| 2142 | 186 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 187 make_block_at(dest_bci); |
| 188 if (s.next_bci() < limit_bci) { | |
| 189 dest = make_block_at(s.next_bci()); | |
| 190 } | |
| 191 } | |
| 192 break; | |
| 193 | |
| 194 case Bytecodes::_lookupswitch: | |
| 195 { | |
| 196 cur_block->set_control_bci(bci); | |
| 2142 | 197 Bytecode_lookupswitch sw(&s); |
| 198 int len = sw.number_of_pairs(); | |
| 0 | 199 ciBlock *dest; |
| 200 int dest_bci; | |
| 201 for (int i = 0; i < len; i++) { | |
| 2142 | 202 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
| 0 | 203 dest = make_block_at(dest_bci); |
| 204 } | |
| 2142 | 205 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 206 dest = make_block_at(dest_bci); |
| 207 if (s.next_bci() < limit_bci) { | |
| 208 dest = make_block_at(s.next_bci()); | |
| 209 } | |
| 210 } | |
| 211 break; | |
| 212 | |
| 213 case Bytecodes::_goto_w : | |
| 214 { | |
| 215 cur_block->set_control_bci(bci); | |
| 216 if (s.next_bci() < limit_bci) { | |
| 217 (void) make_block_at(s.next_bci()); | |
| 218 } | |
| 219 int dest_bci = s.get_far_dest(); | |
| 220 ciBlock *dest = make_block_at(dest_bci); | |
| 221 break; | |
| 222 } | |
| 223 | |
| 224 case Bytecodes::_jsr_w : | |
| 225 { | |
| 226 cur_block->set_control_bci(bci); | |
| 227 ciBlock *ret = make_block_at(s.next_bci()); | |
| 228 int dest_bci = s.get_far_dest(); | |
| 229 ciBlock *dest = make_block_at(dest_bci); | |
| 230 break; | |
| 231 } | |
| 232 | |
| 233 case Bytecodes::_athrow : | |
| 234 cur_block->set_may_throw(); | |
| 235 // fall-through | |
| 236 case Bytecodes::_ret : | |
| 237 case Bytecodes::_ireturn : | |
| 238 case Bytecodes::_lreturn : | |
| 239 case Bytecodes::_freturn : | |
| 240 case Bytecodes::_dreturn : | |
| 241 case Bytecodes::_areturn : | |
| 242 case Bytecodes::_return : | |
| 243 cur_block->set_control_bci(bci); | |
| 244 if (s.next_bci() < limit_bci) { | |
| 245 (void) make_block_at(s.next_bci()); | |
| 246 } | |
| 247 break; | |
| 248 } | |
| 249 } | |
| 250 // End the last block | |
| 251 cur_block->set_limit_bci(limit_bci); | |
| 252 } | |
| 253 | |
| 254 ciMethodBlocks::ciMethodBlocks(Arena *arena, ciMethod *meth): _method(meth), | |
| 255 _arena(arena), _num_blocks(0), _code_size(meth->code_size()) { | |
| 256 int block_estimate = _code_size / 8; | |
| 257 | |
| 1685 | 258 _blocks = new(_arena) GrowableArray<ciBlock *>(_arena, block_estimate, 0, NULL); |
| 0 | 259 int b2bsize = _code_size * sizeof(ciBlock **); |
| 260 _bci_to_block = (ciBlock **) arena->Amalloc(b2bsize); | |
| 261 Copy::zero_to_words((HeapWord*) _bci_to_block, b2bsize / sizeof(HeapWord)); | |
| 262 | |
| 263 // create initial block covering the entire method | |
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264 ciBlock *b = new(arena) ciBlock(_method, _num_blocks++, 0); |
| 0 | 265 _blocks->append(b); |
| 266 _bci_to_block[0] = b; | |
| 267 | |
| 268 // create blocks for exception handlers | |
| 269 if (meth->has_exception_handlers()) { | |
| 270 for(ciExceptionHandlerStream str(meth); !str.is_done(); str.next()) { | |
| 271 ciExceptionHandler* handler = str.handler(); | |
| 272 ciBlock *eb = make_block_at(handler->handler_bci()); | |
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273 // |
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274 // Several exception handlers can have the same handler_bci: |
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275 // |
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276 // try { |
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277 // if (a.foo(b) < 0) { |
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278 // return a.error(); |
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279 // } |
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280 // return CoderResult.UNDERFLOW; |
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281 // } finally { |
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282 // a.position(b); |
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283 // } |
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284 // |
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285 // The try block above is divided into 2 exception blocks |
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286 // separated by 'areturn' bci. |
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287 // |
| 0 | 288 int ex_start = handler->start(); |
| 289 int ex_end = handler->limit(); | |
| 646 | 290 // ensure a block at the start of exception range and start of following code |
| 291 (void) make_block_at(ex_start); | |
| 292 if (ex_end < _code_size) | |
| 293 (void) make_block_at(ex_end); | |
| 294 | |
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295 if (eb->is_handler()) { |
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296 // Extend old handler exception range to cover additional range. |
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297 int old_ex_start = eb->ex_start_bci(); |
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298 int old_ex_end = eb->ex_limit_bci(); |
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299 if (ex_start > old_ex_start) |
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300 ex_start = old_ex_start; |
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301 if (ex_end < old_ex_end) |
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302 ex_end = old_ex_end; |
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303 eb->clear_exception_handler(); // Reset exception information |
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304 } |
| 0 | 305 eb->set_exception_range(ex_start, ex_end); |
| 306 } | |
| 307 } | |
| 308 | |
| 309 // scan the bytecodes and identify blocks | |
| 310 do_analysis(); | |
| 311 | |
| 312 // mark blocks that have exception handlers | |
| 313 if (meth->has_exception_handlers()) { | |
| 314 for(ciExceptionHandlerStream str(meth); !str.is_done(); str.next()) { | |
| 315 ciExceptionHandler* handler = str.handler(); | |
| 316 int ex_start = handler->start(); | |
| 317 int ex_end = handler->limit(); | |
| 318 | |
| 319 int bci = ex_start; | |
| 320 while (bci < ex_end) { | |
| 321 ciBlock *b = block_containing(bci); | |
| 322 b->set_has_handler(); | |
| 323 bci = b->limit_bci(); | |
| 324 } | |
| 325 } | |
| 326 } | |
| 327 } | |
| 328 | |
| 329 void ciMethodBlocks::clear_processed() { | |
| 330 for (int i = 0; i < _blocks->length(); i++) | |
| 331 _blocks->at(i)->clear_processed(); | |
| 332 } | |
| 333 | |
| 334 #ifndef PRODUCT | |
| 335 void ciMethodBlocks::dump() { | |
| 336 tty->print("---- blocks for method: "); | |
| 337 _method->print(); | |
| 338 tty->cr(); | |
| 339 for (int i = 0; i < _blocks->length(); i++) { | |
| 340 tty->print(" B%d: ", i); _blocks->at(i)->dump(); | |
| 341 } | |
| 342 } | |
| 343 #endif | |
| 344 | |
| 345 | |
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346 ciBlock::ciBlock(ciMethod *method, int index, int start_bci) : |
| 0 | 347 #ifndef PRODUCT |
| 348 _method(method), | |
| 349 #endif | |
| 350 _idx(index), _flags(0), _start_bci(start_bci), _limit_bci(-1), _control_bci(fall_through_bci), | |
| 351 _ex_start_bci(-1), _ex_limit_bci(-1) { | |
| 352 } | |
| 353 | |
| 354 void ciBlock::set_exception_range(int start_bci, int limit_bci) { | |
| 355 assert(limit_bci >= start_bci, "valid range"); | |
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356 assert(!is_handler() && _ex_start_bci == -1 && _ex_limit_bci == -1, "must not be handler"); |
| 0 | 357 _ex_start_bci = start_bci; |
| 358 _ex_limit_bci = limit_bci; | |
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6621084: ciMethodBlocks::split_block_at() is broken for methods with exception handler
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359 set_handler(); |
| 0 | 360 } |
| 361 | |
| 362 #ifndef PRODUCT | |
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6ca61c728c2d
6712835: Server compiler fails with assertion (loop_count < K,"infinite loop in PhaseIterGVN::transform")
never
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changeset
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363 static const char *flagnames[] = { |
| 0 | 364 "Processed", |
| 365 "Handler", | |
| 366 "MayThrow", | |
| 367 "Jsr", | |
| 368 "Ret", | |
| 369 "RetTarget", | |
| 370 "HasHandler", | |
| 371 }; | |
| 372 | |
| 373 void ciBlock::dump() { | |
| 374 tty->print(" [%d .. %d), {", _start_bci, _limit_bci); | |
| 375 for (int i = 0; i < 8; i++) { | |
| 376 if ((_flags & (1 << i)) != 0) { | |
| 377 tty->print(" %s", flagnames[i]); | |
| 378 } | |
| 379 } | |
| 380 tty->print(" ]"); | |
| 381 if (is_handler()) | |
| 382 tty->print(" handles(%d..%d)", _ex_start_bci, _ex_limit_bci); | |
| 383 tty->cr(); | |
| 384 } | |
| 385 | |
| 386 // ------------------------------------------------------------------ | |
| 387 // ciBlock::print_on | |
| 388 void ciBlock::print_on(outputStream* st) const { | |
| 389 st->print_cr("--------------------------------------------------------"); | |
| 390 st->print ("ciBlock [%d - %d) control : ", start_bci(), limit_bci()); | |
| 391 if (control_bci() == fall_through_bci) { | |
| 392 st->print_cr("%d:fall through", limit_bci()); | |
| 393 } else { | |
| 394 st->print_cr("%d:%s", control_bci(), | |
| 395 Bytecodes::name(method()->java_code_at_bci(control_bci()))); | |
| 396 } | |
| 397 | |
| 398 if (Verbose || WizardMode) { | |
| 399 method()->print_codes_on(start_bci(), limit_bci(), st); | |
| 400 } | |
| 401 } | |
| 402 #endif |