Mercurial > hg > truffle
annotate src/share/vm/asm/codeBuffer.cpp @ 100:c7c777385a15
6667042: PrintAssembly option does not work without special plugin
Summary: remove old private plugin interface, simplify, rework old plugin to use unchanged Gnu sources
Reviewed-by: kvn, rasbold
| author | jrose |
|---|---|
| date | Wed, 02 Apr 2008 12:09:59 -0700 |
| parents | a61af66fc99e |
| children | ba764ed4b6f2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_codeBuffer.cpp.incl" | |
| 27 | |
| 28 // The structure of a CodeSection: | |
| 29 // | |
| 30 // _start -> +----------------+ | |
| 31 // | machine code...| | |
| 32 // _end -> |----------------| | |
| 33 // | | | |
| 34 // | (empty) | | |
| 35 // | | | |
| 36 // | | | |
| 37 // +----------------+ | |
| 38 // _limit -> | | | |
| 39 // | |
| 40 // _locs_start -> +----------------+ | |
| 41 // |reloc records...| | |
| 42 // |----------------| | |
| 43 // _locs_end -> | | | |
| 44 // | | | |
| 45 // | (empty) | | |
| 46 // | | | |
| 47 // | | | |
| 48 // +----------------+ | |
| 49 // _locs_limit -> | | | |
| 50 // The _end (resp. _limit) pointer refers to the first | |
| 51 // unused (resp. unallocated) byte. | |
| 52 | |
| 53 // The structure of the CodeBuffer while code is being accumulated: | |
| 54 // | |
| 55 // _total_start -> \ | |
| 56 // _insts._start -> +----------------+ | |
| 57 // | | | |
| 58 // | Code | | |
| 59 // | | | |
| 60 // _stubs._start -> |----------------| | |
| 61 // | | | |
| 62 // | Stubs | (also handlers for deopt/exception) | |
| 63 // | | | |
| 64 // _consts._start -> |----------------| | |
| 65 // | | | |
| 66 // | Constants | | |
| 67 // | | | |
| 68 // +----------------+ | |
| 69 // + _total_size -> | | | |
| 70 // | |
| 71 // When the code and relocations are copied to the code cache, | |
| 72 // the empty parts of each section are removed, and everything | |
| 73 // is copied into contiguous locations. | |
| 74 | |
| 75 typedef CodeBuffer::csize_t csize_t; // file-local definition | |
| 76 | |
| 77 // external buffer, in a predefined CodeBlob or other buffer area | |
| 78 // Important: The code_start must be taken exactly, and not realigned. | |
| 79 CodeBuffer::CodeBuffer(address code_start, csize_t code_size) { | |
| 80 assert(code_start != NULL, "sanity"); | |
| 81 initialize_misc("static buffer"); | |
| 82 initialize(code_start, code_size); | |
| 83 assert(verify_section_allocation(), "initial use of buffer OK"); | |
| 84 } | |
| 85 | |
| 86 void CodeBuffer::initialize(csize_t code_size, csize_t locs_size) { | |
| 87 // Compute maximal alignment. | |
| 88 int align = _insts.alignment(); | |
| 89 // Always allow for empty slop around each section. | |
| 90 int slop = (int) CodeSection::end_slop(); | |
| 91 | |
| 92 assert(blob() == NULL, "only once"); | |
| 93 set_blob(BufferBlob::create(_name, code_size + (align+slop) * (SECT_LIMIT+1))); | |
| 94 if (blob() == NULL) { | |
| 95 // The assembler constructor will throw a fatal on an empty CodeBuffer. | |
| 96 return; // caller must test this | |
| 97 } | |
| 98 | |
| 99 // Set up various pointers into the blob. | |
| 100 initialize(_total_start, _total_size); | |
| 101 | |
| 102 assert((uintptr_t)code_begin() % CodeEntryAlignment == 0, "instruction start not code entry aligned"); | |
| 103 | |
| 104 pd_initialize(); | |
| 105 | |
| 106 if (locs_size != 0) { | |
| 107 _insts.initialize_locs(locs_size / sizeof(relocInfo)); | |
| 108 } | |
| 109 | |
| 110 assert(verify_section_allocation(), "initial use of blob is OK"); | |
| 111 } | |
| 112 | |
| 113 | |
| 114 CodeBuffer::~CodeBuffer() { | |
| 115 // If we allocate our code buffer from the CodeCache | |
| 116 // via a BufferBlob, and it's not permanent, then | |
| 117 // free the BufferBlob. | |
| 118 // The rest of the memory will be freed when the ResourceObj | |
| 119 // is released. | |
| 120 assert(verify_section_allocation(), "final storage configuration still OK"); | |
| 121 for (CodeBuffer* cb = this; cb != NULL; cb = cb->before_expand()) { | |
| 122 // Previous incarnations of this buffer are held live, so that internal | |
| 123 // addresses constructed before expansions will not be confused. | |
| 124 cb->free_blob(); | |
| 125 } | |
| 126 #ifdef ASSERT | |
| 127 Copy::fill_to_bytes(this, sizeof(*this), badResourceValue); | |
| 128 #endif | |
| 129 } | |
| 130 | |
| 131 void CodeBuffer::initialize_oop_recorder(OopRecorder* r) { | |
| 132 assert(_oop_recorder == &_default_oop_recorder && _default_oop_recorder.is_unused(), "do this once"); | |
| 133 DEBUG_ONLY(_default_oop_recorder.oop_size()); // force unused OR to be frozen | |
| 134 _oop_recorder = r; | |
| 135 } | |
| 136 | |
| 137 void CodeBuffer::initialize_section_size(CodeSection* cs, csize_t size) { | |
| 138 assert(cs != &_insts, "insts is the memory provider, not the consumer"); | |
| 139 #ifdef ASSERT | |
| 140 for (int n = (int)SECT_INSTS+1; n < (int)SECT_LIMIT; n++) { | |
| 141 CodeSection* prevCS = code_section(n); | |
| 142 if (prevCS == cs) break; | |
| 143 assert(!prevCS->is_allocated(), "section allocation must be in reverse order"); | |
| 144 } | |
| 145 #endif | |
| 146 csize_t slop = CodeSection::end_slop(); // margin between sections | |
| 147 int align = cs->alignment(); | |
| 148 assert(is_power_of_2(align), "sanity"); | |
| 149 address start = _insts._start; | |
| 150 address limit = _insts._limit; | |
| 151 address middle = limit - size; | |
| 152 middle -= (intptr_t)middle & (align-1); // align the division point downward | |
| 153 guarantee(middle - slop > start, "need enough space to divide up"); | |
| 154 _insts._limit = middle - slop; // subtract desired space, plus slop | |
| 155 cs->initialize(middle, limit - middle); | |
| 156 assert(cs->start() == middle, "sanity"); | |
| 157 assert(cs->limit() == limit, "sanity"); | |
| 158 // give it some relocations to start with, if the main section has them | |
| 159 if (_insts.has_locs()) cs->initialize_locs(1); | |
| 160 } | |
| 161 | |
| 162 void CodeBuffer::freeze_section(CodeSection* cs) { | |
| 163 CodeSection* next_cs = (cs == consts())? NULL: code_section(cs->index()+1); | |
| 164 csize_t frozen_size = cs->size(); | |
| 165 if (next_cs != NULL) { | |
| 166 frozen_size = next_cs->align_at_start(frozen_size); | |
| 167 } | |
| 168 address old_limit = cs->limit(); | |
| 169 address new_limit = cs->start() + frozen_size; | |
| 170 relocInfo* old_locs_limit = cs->locs_limit(); | |
| 171 relocInfo* new_locs_limit = cs->locs_end(); | |
| 172 // Patch the limits. | |
| 173 cs->_limit = new_limit; | |
| 174 cs->_locs_limit = new_locs_limit; | |
| 175 cs->_frozen = true; | |
| 176 if (!next_cs->is_allocated() && !next_cs->is_frozen()) { | |
| 177 // Give remaining buffer space to the following section. | |
| 178 next_cs->initialize(new_limit, old_limit - new_limit); | |
| 179 next_cs->initialize_shared_locs(new_locs_limit, | |
| 180 old_locs_limit - new_locs_limit); | |
| 181 } | |
| 182 } | |
| 183 | |
| 184 void CodeBuffer::set_blob(BufferBlob* blob) { | |
| 185 _blob = blob; | |
| 186 if (blob != NULL) { | |
| 187 address start = blob->instructions_begin(); | |
| 188 address end = blob->instructions_end(); | |
| 189 // Round up the starting address. | |
| 190 int align = _insts.alignment(); | |
| 191 start += (-(intptr_t)start) & (align-1); | |
| 192 _total_start = start; | |
| 193 _total_size = end - start; | |
| 194 } else { | |
| 195 #ifdef ASSERT | |
| 196 // Clean out dangling pointers. | |
| 197 _total_start = badAddress; | |
| 198 _insts._start = _insts._end = badAddress; | |
| 199 _stubs._start = _stubs._end = badAddress; | |
| 200 _consts._start = _consts._end = badAddress; | |
| 201 #endif //ASSERT | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 void CodeBuffer::free_blob() { | |
| 206 if (_blob != NULL) { | |
| 207 BufferBlob::free(_blob); | |
| 208 set_blob(NULL); | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 const char* CodeBuffer::code_section_name(int n) { | |
| 213 #ifdef PRODUCT | |
| 214 return NULL; | |
| 215 #else //PRODUCT | |
| 216 switch (n) { | |
| 217 case SECT_INSTS: return "insts"; | |
| 218 case SECT_STUBS: return "stubs"; | |
| 219 case SECT_CONSTS: return "consts"; | |
| 220 default: return NULL; | |
| 221 } | |
| 222 #endif //PRODUCT | |
| 223 } | |
| 224 | |
| 225 int CodeBuffer::section_index_of(address addr) const { | |
| 226 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 227 const CodeSection* cs = code_section(n); | |
| 228 if (cs->allocates(addr)) return n; | |
| 229 } | |
| 230 return SECT_NONE; | |
| 231 } | |
| 232 | |
| 233 int CodeBuffer::locator(address addr) const { | |
| 234 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 235 const CodeSection* cs = code_section(n); | |
| 236 if (cs->allocates(addr)) { | |
| 237 return locator(addr - cs->start(), n); | |
| 238 } | |
| 239 } | |
| 240 return -1; | |
| 241 } | |
| 242 | |
| 243 address CodeBuffer::locator_address(int locator) const { | |
| 244 if (locator < 0) return NULL; | |
| 245 address start = code_section(locator_sect(locator))->start(); | |
| 246 return start + locator_pos(locator); | |
| 247 } | |
| 248 | |
| 249 address CodeBuffer::decode_begin() { | |
| 250 address begin = _insts.start(); | |
| 251 if (_decode_begin != NULL && _decode_begin > begin) | |
| 252 begin = _decode_begin; | |
| 253 return begin; | |
| 254 } | |
| 255 | |
| 256 | |
| 257 GrowableArray<int>* CodeBuffer::create_patch_overflow() { | |
| 258 if (_overflow_arena == NULL) { | |
| 259 _overflow_arena = new Arena(); | |
| 260 } | |
| 261 return new (_overflow_arena) GrowableArray<int>(_overflow_arena, 8, 0, 0); | |
| 262 } | |
| 263 | |
| 264 | |
| 265 // Helper function for managing labels and their target addresses. | |
| 266 // Returns a sensible address, and if it is not the label's final | |
| 267 // address, notes the dependency (at 'branch_pc') on the label. | |
| 268 address CodeSection::target(Label& L, address branch_pc) { | |
| 269 if (L.is_bound()) { | |
| 270 int loc = L.loc(); | |
| 271 if (index() == CodeBuffer::locator_sect(loc)) { | |
| 272 return start() + CodeBuffer::locator_pos(loc); | |
| 273 } else { | |
| 274 return outer()->locator_address(loc); | |
| 275 } | |
| 276 } else { | |
| 277 assert(allocates2(branch_pc), "sanity"); | |
| 278 address base = start(); | |
| 279 int patch_loc = CodeBuffer::locator(branch_pc - base, index()); | |
| 280 L.add_patch_at(outer(), patch_loc); | |
| 281 | |
| 282 // Need to return a pc, doesn't matter what it is since it will be | |
| 283 // replaced during resolution later. | |
| 284 // (Don't return NULL or badAddress, since branches shouldn't overflow.) | |
| 285 return base; | |
| 286 } | |
| 287 } | |
| 288 | |
| 289 void CodeSection::relocate(address at, RelocationHolder const& spec, int format) { | |
| 290 Relocation* reloc = spec.reloc(); | |
| 291 relocInfo::relocType rtype = (relocInfo::relocType) reloc->type(); | |
| 292 if (rtype == relocInfo::none) return; | |
| 293 | |
| 294 // The assertion below has been adjusted, to also work for | |
| 295 // relocation for fixup. Sometimes we want to put relocation | |
| 296 // information for the next instruction, since it will be patched | |
| 297 // with a call. | |
| 298 assert(start() <= at && at <= end()+1, | |
| 299 "cannot relocate data outside code boundaries"); | |
| 300 | |
| 301 if (!has_locs()) { | |
| 302 // no space for relocation information provided => code cannot be | |
| 303 // relocated. Make sure that relocate is only called with rtypes | |
| 304 // that can be ignored for this kind of code. | |
| 305 assert(rtype == relocInfo::none || | |
| 306 rtype == relocInfo::runtime_call_type || | |
| 307 rtype == relocInfo::internal_word_type|| | |
| 308 rtype == relocInfo::section_word_type || | |
| 309 rtype == relocInfo::external_word_type, | |
| 310 "code needs relocation information"); | |
| 311 // leave behind an indication that we attempted a relocation | |
| 312 DEBUG_ONLY(_locs_start = _locs_limit = (relocInfo*)badAddress); | |
| 313 return; | |
| 314 } | |
| 315 | |
| 316 // Advance the point, noting the offset we'll have to record. | |
| 317 csize_t offset = at - locs_point(); | |
| 318 set_locs_point(at); | |
| 319 | |
| 320 // Test for a couple of overflow conditions; maybe expand the buffer. | |
| 321 relocInfo* end = locs_end(); | |
| 322 relocInfo* req = end + relocInfo::length_limit; | |
| 323 // Check for (potential) overflow | |
| 324 if (req >= locs_limit() || offset >= relocInfo::offset_limit()) { | |
| 325 req += (uint)offset / (uint)relocInfo::offset_limit(); | |
| 326 if (req >= locs_limit()) { | |
| 327 // Allocate or reallocate. | |
| 328 expand_locs(locs_count() + (req - end)); | |
| 329 // reload pointer | |
| 330 end = locs_end(); | |
| 331 } | |
| 332 } | |
| 333 | |
| 334 // If the offset is giant, emit filler relocs, of type 'none', but | |
| 335 // each carrying the largest possible offset, to advance the locs_point. | |
| 336 while (offset >= relocInfo::offset_limit()) { | |
| 337 assert(end < locs_limit(), "adjust previous paragraph of code"); | |
| 338 *end++ = filler_relocInfo(); | |
| 339 offset -= filler_relocInfo().addr_offset(); | |
| 340 } | |
| 341 | |
| 342 // If it's a simple reloc with no data, we'll just write (rtype | offset). | |
| 343 (*end) = relocInfo(rtype, offset, format); | |
| 344 | |
| 345 // If it has data, insert the prefix, as (data_prefix_tag | data1), data2. | |
| 346 end->initialize(this, reloc); | |
| 347 } | |
| 348 | |
| 349 void CodeSection::initialize_locs(int locs_capacity) { | |
| 350 assert(_locs_start == NULL, "only one locs init step, please"); | |
| 351 // Apply a priori lower limits to relocation size: | |
| 352 csize_t min_locs = MAX2(size() / 16, (csize_t)4); | |
| 353 if (locs_capacity < min_locs) locs_capacity = min_locs; | |
| 354 relocInfo* locs_start = NEW_RESOURCE_ARRAY(relocInfo, locs_capacity); | |
| 355 _locs_start = locs_start; | |
| 356 _locs_end = locs_start; | |
| 357 _locs_limit = locs_start + locs_capacity; | |
| 358 _locs_own = true; | |
| 359 } | |
| 360 | |
| 361 void CodeSection::initialize_shared_locs(relocInfo* buf, int length) { | |
| 362 assert(_locs_start == NULL, "do this before locs are allocated"); | |
| 363 // Internal invariant: locs buf must be fully aligned. | |
| 364 // See copy_relocations_to() below. | |
| 365 while ((uintptr_t)buf % HeapWordSize != 0 && length > 0) { | |
| 366 ++buf; --length; | |
| 367 } | |
| 368 if (length > 0) { | |
| 369 _locs_start = buf; | |
| 370 _locs_end = buf; | |
| 371 _locs_limit = buf + length; | |
| 372 _locs_own = false; | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 void CodeSection::initialize_locs_from(const CodeSection* source_cs) { | |
| 377 int lcount = source_cs->locs_count(); | |
| 378 if (lcount != 0) { | |
| 379 initialize_shared_locs(source_cs->locs_start(), lcount); | |
| 380 _locs_end = _locs_limit = _locs_start + lcount; | |
| 381 assert(is_allocated(), "must have copied code already"); | |
| 382 set_locs_point(start() + source_cs->locs_point_off()); | |
| 383 } | |
| 384 assert(this->locs_count() == source_cs->locs_count(), "sanity"); | |
| 385 } | |
| 386 | |
| 387 void CodeSection::expand_locs(int new_capacity) { | |
| 388 if (_locs_start == NULL) { | |
| 389 initialize_locs(new_capacity); | |
| 390 return; | |
| 391 } else { | |
| 392 int old_count = locs_count(); | |
| 393 int old_capacity = locs_capacity(); | |
| 394 if (new_capacity < old_capacity * 2) | |
| 395 new_capacity = old_capacity * 2; | |
| 396 relocInfo* locs_start; | |
| 397 if (_locs_own) { | |
| 398 locs_start = REALLOC_RESOURCE_ARRAY(relocInfo, _locs_start, old_capacity, new_capacity); | |
| 399 } else { | |
| 400 locs_start = NEW_RESOURCE_ARRAY(relocInfo, new_capacity); | |
| 401 Copy::conjoint_bytes(_locs_start, locs_start, old_capacity * sizeof(relocInfo)); | |
| 402 _locs_own = true; | |
| 403 } | |
| 404 _locs_start = locs_start; | |
| 405 _locs_end = locs_start + old_count; | |
| 406 _locs_limit = locs_start + new_capacity; | |
| 407 } | |
| 408 } | |
| 409 | |
| 410 | |
| 411 /// Support for emitting the code to its final location. | |
| 412 /// The pattern is the same for all functions. | |
| 413 /// We iterate over all the sections, padding each to alignment. | |
| 414 | |
| 415 csize_t CodeBuffer::total_code_size() const { | |
| 416 csize_t code_size_so_far = 0; | |
| 417 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 418 const CodeSection* cs = code_section(n); | |
| 419 if (cs->is_empty()) continue; // skip trivial section | |
| 420 code_size_so_far = cs->align_at_start(code_size_so_far); | |
| 421 code_size_so_far += cs->size(); | |
| 422 } | |
| 423 return code_size_so_far; | |
| 424 } | |
| 425 | |
| 426 void CodeBuffer::compute_final_layout(CodeBuffer* dest) const { | |
| 427 address buf = dest->_total_start; | |
| 428 csize_t buf_offset = 0; | |
| 429 assert(dest->_total_size >= total_code_size(), "must be big enough"); | |
| 430 | |
| 431 { | |
| 432 // not sure why this is here, but why not... | |
| 433 int alignSize = MAX2((intx) sizeof(jdouble), CodeEntryAlignment); | |
| 434 assert( (dest->_total_start - _insts.start()) % alignSize == 0, "copy must preserve alignment"); | |
| 435 } | |
| 436 | |
| 437 const CodeSection* prev_cs = NULL; | |
| 438 CodeSection* prev_dest_cs = NULL; | |
| 439 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 440 // figure compact layout of each section | |
| 441 const CodeSection* cs = code_section(n); | |
| 442 address cstart = cs->start(); | |
| 443 address cend = cs->end(); | |
| 444 csize_t csize = cend - cstart; | |
| 445 | |
| 446 CodeSection* dest_cs = dest->code_section(n); | |
| 447 if (!cs->is_empty()) { | |
| 448 // Compute initial padding; assign it to the previous non-empty guy. | |
| 449 // Cf. figure_expanded_capacities. | |
| 450 csize_t padding = cs->align_at_start(buf_offset) - buf_offset; | |
| 451 if (padding != 0) { | |
| 452 buf_offset += padding; | |
| 453 assert(prev_dest_cs != NULL, "sanity"); | |
| 454 prev_dest_cs->_limit += padding; | |
| 455 } | |
| 456 #ifdef ASSERT | |
| 457 if (prev_cs != NULL && prev_cs->is_frozen() && n < SECT_CONSTS) { | |
| 458 // Make sure the ends still match up. | |
| 459 // This is important because a branch in a frozen section | |
| 460 // might target code in a following section, via a Label, | |
| 461 // and without a relocation record. See Label::patch_instructions. | |
| 462 address dest_start = buf+buf_offset; | |
| 463 csize_t start2start = cs->start() - prev_cs->start(); | |
| 464 csize_t dest_start2start = dest_start - prev_dest_cs->start(); | |
| 465 assert(start2start == dest_start2start, "cannot stretch frozen sect"); | |
| 466 } | |
| 467 #endif //ASSERT | |
| 468 prev_dest_cs = dest_cs; | |
| 469 prev_cs = cs; | |
| 470 } | |
| 471 | |
| 472 debug_only(dest_cs->_start = NULL); // defeat double-initialization assert | |
| 473 dest_cs->initialize(buf+buf_offset, csize); | |
| 474 dest_cs->set_end(buf+buf_offset+csize); | |
| 475 assert(dest_cs->is_allocated(), "must always be allocated"); | |
| 476 assert(cs->is_empty() == dest_cs->is_empty(), "sanity"); | |
| 477 | |
| 478 buf_offset += csize; | |
| 479 } | |
| 480 | |
| 481 // Done calculating sections; did it come out to the right end? | |
| 482 assert(buf_offset == total_code_size(), "sanity"); | |
| 483 assert(dest->verify_section_allocation(), "final configuration works"); | |
| 484 } | |
| 485 | |
| 486 csize_t CodeBuffer::total_offset_of(address addr) const { | |
| 487 csize_t code_size_so_far = 0; | |
| 488 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 489 const CodeSection* cs = code_section(n); | |
| 490 if (!cs->is_empty()) { | |
| 491 code_size_so_far = cs->align_at_start(code_size_so_far); | |
| 492 } | |
| 493 if (cs->contains2(addr)) { | |
| 494 return code_size_so_far + (addr - cs->start()); | |
| 495 } | |
| 496 code_size_so_far += cs->size(); | |
| 497 } | |
| 498 #ifndef PRODUCT | |
| 499 tty->print_cr("Dangling address " PTR_FORMAT " in:", addr); | |
| 500 ((CodeBuffer*)this)->print(); | |
| 501 #endif | |
| 502 ShouldNotReachHere(); | |
| 503 return -1; | |
| 504 } | |
| 505 | |
| 506 csize_t CodeBuffer::total_relocation_size() const { | |
| 507 csize_t lsize = copy_relocations_to(NULL); // dry run only | |
| 508 csize_t csize = total_code_size(); | |
| 509 csize_t total = RelocIterator::locs_and_index_size(csize, lsize); | |
| 510 return (csize_t) align_size_up(total, HeapWordSize); | |
| 511 } | |
| 512 | |
| 513 csize_t CodeBuffer::copy_relocations_to(CodeBlob* dest) const { | |
| 514 address buf = NULL; | |
| 515 csize_t buf_offset = 0; | |
| 516 csize_t buf_limit = 0; | |
| 517 if (dest != NULL) { | |
| 518 buf = (address)dest->relocation_begin(); | |
| 519 buf_limit = (address)dest->relocation_end() - buf; | |
| 520 assert((uintptr_t)buf % HeapWordSize == 0, "buf must be fully aligned"); | |
| 521 assert(buf_limit % HeapWordSize == 0, "buf must be evenly sized"); | |
| 522 } | |
| 523 // if dest == NULL, this is just the sizing pass | |
| 524 | |
| 525 csize_t code_end_so_far = 0; | |
| 526 csize_t code_point_so_far = 0; | |
| 527 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 528 // pull relocs out of each section | |
| 529 const CodeSection* cs = code_section(n); | |
| 530 assert(!(cs->is_empty() && cs->locs_count() > 0), "sanity"); | |
| 531 if (cs->is_empty()) continue; // skip trivial section | |
| 532 relocInfo* lstart = cs->locs_start(); | |
| 533 relocInfo* lend = cs->locs_end(); | |
| 534 csize_t lsize = (csize_t)( (address)lend - (address)lstart ); | |
| 535 csize_t csize = cs->size(); | |
| 536 code_end_so_far = cs->align_at_start(code_end_so_far); | |
| 537 | |
| 538 if (lsize > 0) { | |
| 539 // Figure out how to advance the combined relocation point | |
| 540 // first to the beginning of this section. | |
| 541 // We'll insert one or more filler relocs to span that gap. | |
| 542 // (Don't bother to improve this by editing the first reloc's offset.) | |
| 543 csize_t new_code_point = code_end_so_far; | |
| 544 for (csize_t jump; | |
| 545 code_point_so_far < new_code_point; | |
| 546 code_point_so_far += jump) { | |
| 547 jump = new_code_point - code_point_so_far; | |
| 548 relocInfo filler = filler_relocInfo(); | |
| 549 if (jump >= filler.addr_offset()) { | |
| 550 jump = filler.addr_offset(); | |
| 551 } else { // else shrink the filler to fit | |
| 552 filler = relocInfo(relocInfo::none, jump); | |
| 553 } | |
| 554 if (buf != NULL) { | |
| 555 assert(buf_offset + (csize_t)sizeof(filler) <= buf_limit, "filler in bounds"); | |
| 556 *(relocInfo*)(buf+buf_offset) = filler; | |
| 557 } | |
| 558 buf_offset += sizeof(filler); | |
| 559 } | |
| 560 | |
| 561 // Update code point and end to skip past this section: | |
| 562 csize_t last_code_point = code_end_so_far + cs->locs_point_off(); | |
| 563 assert(code_point_so_far <= last_code_point, "sanity"); | |
| 564 code_point_so_far = last_code_point; // advance past this guy's relocs | |
| 565 } | |
| 566 code_end_so_far += csize; // advance past this guy's instructions too | |
| 567 | |
| 568 // Done with filler; emit the real relocations: | |
| 569 if (buf != NULL && lsize != 0) { | |
| 570 assert(buf_offset + lsize <= buf_limit, "target in bounds"); | |
| 571 assert((uintptr_t)lstart % HeapWordSize == 0, "sane start"); | |
| 572 if (buf_offset % HeapWordSize == 0) { | |
| 573 // Use wordwise copies if possible: | |
| 574 Copy::disjoint_words((HeapWord*)lstart, | |
| 575 (HeapWord*)(buf+buf_offset), | |
| 576 (lsize + HeapWordSize-1) / HeapWordSize); | |
| 577 } else { | |
| 578 Copy::conjoint_bytes(lstart, buf+buf_offset, lsize); | |
| 579 } | |
| 580 } | |
| 581 buf_offset += lsize; | |
| 582 } | |
| 583 | |
| 584 // Align end of relocation info in target. | |
| 585 while (buf_offset % HeapWordSize != 0) { | |
| 586 if (buf != NULL) { | |
| 587 relocInfo padding = relocInfo(relocInfo::none, 0); | |
| 588 assert(buf_offset + (csize_t)sizeof(padding) <= buf_limit, "padding in bounds"); | |
| 589 *(relocInfo*)(buf+buf_offset) = padding; | |
| 590 } | |
| 591 buf_offset += sizeof(relocInfo); | |
| 592 } | |
| 593 | |
| 594 assert(code_end_so_far == total_code_size(), "sanity"); | |
| 595 | |
| 596 // Account for index: | |
| 597 if (buf != NULL) { | |
| 598 RelocIterator::create_index(dest->relocation_begin(), | |
| 599 buf_offset / sizeof(relocInfo), | |
| 600 dest->relocation_end()); | |
| 601 } | |
| 602 | |
| 603 return buf_offset; | |
| 604 } | |
| 605 | |
| 606 void CodeBuffer::copy_code_to(CodeBlob* dest_blob) { | |
| 607 #ifndef PRODUCT | |
| 608 if (PrintNMethods && (WizardMode || Verbose)) { | |
| 609 tty->print("done with CodeBuffer:"); | |
| 610 ((CodeBuffer*)this)->print(); | |
| 611 } | |
| 612 #endif //PRODUCT | |
| 613 | |
| 614 CodeBuffer dest(dest_blob->instructions_begin(), | |
| 615 dest_blob->instructions_size()); | |
| 616 assert(dest_blob->instructions_size() >= total_code_size(), "good sizing"); | |
| 617 this->compute_final_layout(&dest); | |
| 618 relocate_code_to(&dest); | |
| 619 | |
| 620 // transfer comments from buffer to blob | |
| 621 dest_blob->set_comments(_comments); | |
| 622 | |
| 623 // Done moving code bytes; were they the right size? | |
| 624 assert(round_to(dest.total_code_size(), oopSize) == dest_blob->instructions_size(), "sanity"); | |
| 625 | |
| 626 // Flush generated code | |
| 627 ICache::invalidate_range(dest_blob->instructions_begin(), | |
| 628 dest_blob->instructions_size()); | |
| 629 } | |
| 630 | |
| 631 // Move all my code into another code buffer. | |
| 632 // Consult applicable relocs to repair embedded addresses. | |
| 633 void CodeBuffer::relocate_code_to(CodeBuffer* dest) const { | |
| 634 DEBUG_ONLY(address dest_end = dest->_total_start + dest->_total_size); | |
| 635 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 636 // pull code out of each section | |
| 637 const CodeSection* cs = code_section(n); | |
| 638 if (cs->is_empty()) continue; // skip trivial section | |
| 639 CodeSection* dest_cs = dest->code_section(n); | |
| 640 assert(cs->size() == dest_cs->size(), "sanity"); | |
| 641 csize_t usize = dest_cs->size(); | |
| 642 csize_t wsize = align_size_up(usize, HeapWordSize); | |
| 643 assert(dest_cs->start() + wsize <= dest_end, "no overflow"); | |
| 644 // Copy the code as aligned machine words. | |
| 645 // This may also include an uninitialized partial word at the end. | |
| 646 Copy::disjoint_words((HeapWord*)cs->start(), | |
| 647 (HeapWord*)dest_cs->start(), | |
| 648 wsize / HeapWordSize); | |
| 649 | |
| 650 if (dest->blob() == NULL) { | |
| 651 // Destination is a final resting place, not just another buffer. | |
| 652 // Normalize uninitialized bytes in the final padding. | |
| 653 Copy::fill_to_bytes(dest_cs->end(), dest_cs->remaining(), | |
| 654 Assembler::code_fill_byte()); | |
| 655 } | |
| 656 | |
| 657 assert(cs->locs_start() != (relocInfo*)badAddress, | |
| 658 "this section carries no reloc storage, but reloc was attempted"); | |
| 659 | |
| 660 // Make the new code copy use the old copy's relocations: | |
| 661 dest_cs->initialize_locs_from(cs); | |
| 662 | |
| 663 { // Repair the pc relative information in the code after the move | |
| 664 RelocIterator iter(dest_cs); | |
| 665 while (iter.next()) { | |
| 666 iter.reloc()->fix_relocation_after_move(this, dest); | |
| 667 } | |
| 668 } | |
| 669 } | |
| 670 } | |
| 671 | |
| 672 csize_t CodeBuffer::figure_expanded_capacities(CodeSection* which_cs, | |
| 673 csize_t amount, | |
| 674 csize_t* new_capacity) { | |
| 675 csize_t new_total_cap = 0; | |
| 676 | |
| 677 int prev_n = -1; | |
| 678 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 679 const CodeSection* sect = code_section(n); | |
| 680 | |
| 681 if (!sect->is_empty()) { | |
| 682 // Compute initial padding; assign it to the previous non-empty guy. | |
| 683 // Cf. compute_final_layout. | |
| 684 csize_t padding = sect->align_at_start(new_total_cap) - new_total_cap; | |
| 685 if (padding != 0) { | |
| 686 new_total_cap += padding; | |
| 687 assert(prev_n >= 0, "sanity"); | |
| 688 new_capacity[prev_n] += padding; | |
| 689 } | |
| 690 prev_n = n; | |
| 691 } | |
| 692 | |
| 693 csize_t exp = sect->size(); // 100% increase | |
| 694 if ((uint)exp < 4*K) exp = 4*K; // minimum initial increase | |
| 695 if (sect == which_cs) { | |
| 696 if (exp < amount) exp = amount; | |
| 697 if (StressCodeBuffers) exp = amount; // expand only slightly | |
| 698 } else if (n == SECT_INSTS) { | |
| 699 // scale down inst increases to a more modest 25% | |
| 700 exp = 4*K + ((exp - 4*K) >> 2); | |
| 701 if (StressCodeBuffers) exp = amount / 2; // expand only slightly | |
| 702 } else if (sect->is_empty()) { | |
| 703 // do not grow an empty secondary section | |
| 704 exp = 0; | |
| 705 } | |
| 706 // Allow for inter-section slop: | |
| 707 exp += CodeSection::end_slop(); | |
| 708 csize_t new_cap = sect->size() + exp; | |
| 709 if (new_cap < sect->capacity()) { | |
| 710 // No need to expand after all. | |
| 711 new_cap = sect->capacity(); | |
| 712 } | |
| 713 new_capacity[n] = new_cap; | |
| 714 new_total_cap += new_cap; | |
| 715 } | |
| 716 | |
| 717 return new_total_cap; | |
| 718 } | |
| 719 | |
| 720 void CodeBuffer::expand(CodeSection* which_cs, csize_t amount) { | |
| 721 #ifndef PRODUCT | |
| 722 if (PrintNMethods && (WizardMode || Verbose)) { | |
| 723 tty->print("expanding CodeBuffer:"); | |
| 724 this->print(); | |
| 725 } | |
| 726 | |
| 727 if (StressCodeBuffers && blob() != NULL) { | |
| 728 static int expand_count = 0; | |
| 729 if (expand_count >= 0) expand_count += 1; | |
| 730 if (expand_count > 100 && is_power_of_2(expand_count)) { | |
| 731 tty->print_cr("StressCodeBuffers: have expanded %d times", expand_count); | |
| 732 // simulate an occasional allocation failure: | |
| 733 free_blob(); | |
| 734 } | |
| 735 } | |
| 736 #endif //PRODUCT | |
| 737 | |
| 738 // Resizing must be allowed | |
| 739 { | |
| 740 if (blob() == NULL) return; // caller must check for blob == NULL | |
| 741 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 742 guarantee(!code_section(n)->is_frozen(), "resizing not allowed when frozen"); | |
| 743 } | |
| 744 } | |
| 745 | |
| 746 // Figure new capacity for each section. | |
| 747 csize_t new_capacity[SECT_LIMIT]; | |
| 748 csize_t new_total_cap | |
| 749 = figure_expanded_capacities(which_cs, amount, new_capacity); | |
| 750 | |
| 751 // Create a new (temporary) code buffer to hold all the new data | |
| 752 CodeBuffer cb(name(), new_total_cap, 0); | |
| 753 if (cb.blob() == NULL) { | |
| 754 // Failed to allocate in code cache. | |
| 755 free_blob(); | |
| 756 return; | |
| 757 } | |
| 758 | |
| 759 // Create an old code buffer to remember which addresses used to go where. | |
| 760 // This will be useful when we do final assembly into the code cache, | |
| 761 // because we will need to know how to warp any internal address that | |
| 762 // has been created at any time in this CodeBuffer's past. | |
| 763 CodeBuffer* bxp = new CodeBuffer(_total_start, _total_size); | |
| 764 bxp->take_over_code_from(this); // remember the old undersized blob | |
| 765 DEBUG_ONLY(this->_blob = NULL); // silence a later assert | |
| 766 bxp->_before_expand = this->_before_expand; | |
| 767 this->_before_expand = bxp; | |
| 768 | |
| 769 // Give each section its required (expanded) capacity. | |
| 770 for (int n = (int)SECT_LIMIT-1; n >= SECT_INSTS; n--) { | |
| 771 CodeSection* cb_sect = cb.code_section(n); | |
| 772 CodeSection* this_sect = code_section(n); | |
| 773 if (new_capacity[n] == 0) continue; // already nulled out | |
| 774 if (n > SECT_INSTS) { | |
| 775 cb.initialize_section_size(cb_sect, new_capacity[n]); | |
| 776 } | |
| 777 assert(cb_sect->capacity() >= new_capacity[n], "big enough"); | |
| 778 address cb_start = cb_sect->start(); | |
| 779 cb_sect->set_end(cb_start + this_sect->size()); | |
| 780 if (this_sect->mark() == NULL) { | |
| 781 cb_sect->clear_mark(); | |
| 782 } else { | |
| 783 cb_sect->set_mark(cb_start + this_sect->mark_off()); | |
| 784 } | |
| 785 } | |
| 786 | |
| 787 // Move all the code and relocations to the new blob: | |
| 788 relocate_code_to(&cb); | |
| 789 | |
| 790 // Copy the temporary code buffer into the current code buffer. | |
| 791 // Basically, do {*this = cb}, except for some control information. | |
| 792 this->take_over_code_from(&cb); | |
| 793 cb.set_blob(NULL); | |
| 794 | |
| 795 // Zap the old code buffer contents, to avoid mistakenly using them. | |
| 796 debug_only(Copy::fill_to_bytes(bxp->_total_start, bxp->_total_size, | |
| 797 badCodeHeapFreeVal)); | |
| 798 | |
| 799 _decode_begin = NULL; // sanity | |
| 800 | |
| 801 // Make certain that the new sections are all snugly inside the new blob. | |
| 802 assert(verify_section_allocation(), "expanded allocation is ship-shape"); | |
| 803 | |
| 804 #ifndef PRODUCT | |
| 805 if (PrintNMethods && (WizardMode || Verbose)) { | |
| 806 tty->print("expanded CodeBuffer:"); | |
| 807 this->print(); | |
| 808 } | |
| 809 #endif //PRODUCT | |
| 810 } | |
| 811 | |
| 812 void CodeBuffer::take_over_code_from(CodeBuffer* cb) { | |
| 813 // Must already have disposed of the old blob somehow. | |
| 814 assert(blob() == NULL, "must be empty"); | |
| 815 #ifdef ASSERT | |
| 816 | |
| 817 #endif | |
| 818 // Take the new blob away from cb. | |
| 819 set_blob(cb->blob()); | |
| 820 // Take over all the section pointers. | |
| 821 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 822 CodeSection* cb_sect = cb->code_section(n); | |
| 823 CodeSection* this_sect = code_section(n); | |
| 824 this_sect->take_over_code_from(cb_sect); | |
| 825 } | |
| 826 _overflow_arena = cb->_overflow_arena; | |
| 827 // Make sure the old cb won't try to use it or free it. | |
| 828 DEBUG_ONLY(cb->_blob = (BufferBlob*)badAddress); | |
| 829 } | |
| 830 | |
| 831 #ifdef ASSERT | |
| 832 bool CodeBuffer::verify_section_allocation() { | |
| 833 address tstart = _total_start; | |
| 834 if (tstart == badAddress) return true; // smashed by set_blob(NULL) | |
| 835 address tend = tstart + _total_size; | |
| 836 if (_blob != NULL) { | |
| 837 assert(tstart >= _blob->instructions_begin(), "sanity"); | |
| 838 assert(tend <= _blob->instructions_end(), "sanity"); | |
| 839 } | |
| 840 address tcheck = tstart; // advancing pointer to verify disjointness | |
| 841 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 842 CodeSection* sect = code_section(n); | |
| 843 if (!sect->is_allocated()) continue; | |
| 844 assert(sect->start() >= tcheck, "sanity"); | |
| 845 tcheck = sect->start(); | |
| 846 assert((intptr_t)tcheck % sect->alignment() == 0 | |
| 847 || sect->is_empty() || _blob == NULL, | |
| 848 "start is aligned"); | |
| 849 assert(sect->end() >= tcheck, "sanity"); | |
| 850 assert(sect->end() <= tend, "sanity"); | |
| 851 } | |
| 852 return true; | |
| 853 } | |
| 854 #endif //ASSERT | |
| 855 | |
| 856 #ifndef PRODUCT | |
| 857 | |
| 858 void CodeSection::dump() { | |
| 859 address ptr = start(); | |
| 860 for (csize_t step; ptr < end(); ptr += step) { | |
| 861 step = end() - ptr; | |
| 862 if (step > jintSize * 4) step = jintSize * 4; | |
| 863 tty->print(PTR_FORMAT ": ", ptr); | |
| 864 while (step > 0) { | |
| 865 tty->print(" " PTR32_FORMAT, *(jint*)ptr); | |
| 866 ptr += jintSize; | |
| 867 } | |
| 868 tty->cr(); | |
| 869 } | |
| 870 } | |
| 871 | |
| 872 | |
| 873 void CodeSection::decode() { | |
| 874 Disassembler::decode(start(), end()); | |
| 875 } | |
| 876 | |
| 877 | |
| 878 void CodeBuffer::block_comment(intptr_t offset, const char * comment) { | |
| 879 _comments.add_comment(offset, comment); | |
| 880 } | |
| 881 | |
| 882 | |
| 883 class CodeComment: public CHeapObj { | |
| 884 private: | |
| 885 friend class CodeComments; | |
| 886 intptr_t _offset; | |
| 887 const char * _comment; | |
| 888 CodeComment* _next; | |
| 889 | |
| 890 ~CodeComment() { | |
| 891 assert(_next == NULL, "wrong interface for freeing list"); | |
| 892 os::free((void*)_comment); | |
| 893 } | |
| 894 | |
| 895 public: | |
| 896 CodeComment(intptr_t offset, const char * comment) { | |
| 897 _offset = offset; | |
| 898 _comment = os::strdup(comment); | |
| 899 _next = NULL; | |
| 900 } | |
| 901 | |
| 902 intptr_t offset() const { return _offset; } | |
| 903 const char * comment() const { return _comment; } | |
| 904 CodeComment* next() { return _next; } | |
| 905 | |
| 906 void set_next(CodeComment* next) { _next = next; } | |
| 907 | |
| 908 CodeComment* find(intptr_t offset) { | |
| 909 CodeComment* a = this; | |
| 910 while (a != NULL && a->_offset != offset) { | |
| 911 a = a->_next; | |
| 912 } | |
| 913 return a; | |
| 914 } | |
| 915 }; | |
| 916 | |
| 917 | |
| 918 void CodeComments::add_comment(intptr_t offset, const char * comment) { | |
| 919 CodeComment* c = new CodeComment(offset, comment); | |
| 920 CodeComment* insert = NULL; | |
| 921 if (_comments != NULL) { | |
| 922 CodeComment* c = _comments->find(offset); | |
| 923 insert = c; | |
| 924 while (c && c->offset() == offset) { | |
| 925 insert = c; | |
| 926 c = c->next(); | |
| 927 } | |
| 928 } | |
| 929 if (insert) { | |
| 930 // insert after comments with same offset | |
| 931 c->set_next(insert->next()); | |
| 932 insert->set_next(c); | |
| 933 } else { | |
| 934 c->set_next(_comments); | |
| 935 _comments = c; | |
| 936 } | |
| 937 } | |
| 938 | |
| 939 | |
| 940 void CodeComments::assign(CodeComments& other) { | |
| 941 assert(_comments == NULL, "don't overwrite old value"); | |
| 942 _comments = other._comments; | |
| 943 } | |
| 944 | |
| 945 | |
| 946 void CodeComments::print_block_comment(outputStream* stream, intptr_t offset) { | |
| 947 if (_comments != NULL) { | |
| 948 CodeComment* c = _comments->find(offset); | |
| 949 while (c && c->offset() == offset) { | |
|
100
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950 stream->bol(); |
| 0 | 951 stream->print(" ;; "); |
| 952 stream->print_cr(c->comment()); | |
| 953 c = c->next(); | |
| 954 } | |
| 955 } | |
| 956 } | |
| 957 | |
| 958 | |
| 959 void CodeComments::free() { | |
| 960 CodeComment* n = _comments; | |
| 961 while (n) { | |
| 962 // unlink the node from the list saving a pointer to the next | |
| 963 CodeComment* p = n->_next; | |
| 964 n->_next = NULL; | |
| 965 delete n; | |
| 966 n = p; | |
| 967 } | |
| 968 _comments = NULL; | |
| 969 } | |
| 970 | |
| 971 | |
| 972 | |
| 973 void CodeBuffer::decode() { | |
| 974 Disassembler::decode(decode_begin(), code_end()); | |
| 975 _decode_begin = code_end(); | |
| 976 } | |
| 977 | |
| 978 | |
| 979 void CodeBuffer::skip_decode() { | |
| 980 _decode_begin = code_end(); | |
| 981 } | |
| 982 | |
| 983 | |
| 984 void CodeBuffer::decode_all() { | |
| 985 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 986 // dump contents of each section | |
| 987 CodeSection* cs = code_section(n); | |
| 988 tty->print_cr("! %s:", code_section_name(n)); | |
| 989 if (cs != consts()) | |
| 990 cs->decode(); | |
| 991 else | |
| 992 cs->dump(); | |
| 993 } | |
| 994 } | |
| 995 | |
| 996 | |
| 997 void CodeSection::print(const char* name) { | |
| 998 csize_t locs_size = locs_end() - locs_start(); | |
| 999 tty->print_cr(" %7s.code = " PTR_FORMAT " : " PTR_FORMAT " : " PTR_FORMAT " (%d of %d)%s", | |
| 1000 name, start(), end(), limit(), size(), capacity(), | |
| 1001 is_frozen()? " [frozen]": ""); | |
| 1002 tty->print_cr(" %7s.locs = " PTR_FORMAT " : " PTR_FORMAT " : " PTR_FORMAT " (%d of %d) point=%d", | |
| 1003 name, locs_start(), locs_end(), locs_limit(), locs_size, locs_capacity(), locs_point_off()); | |
| 1004 if (PrintRelocations) { | |
| 1005 RelocIterator iter(this); | |
| 1006 iter.print(); | |
| 1007 } | |
| 1008 } | |
| 1009 | |
| 1010 void CodeBuffer::print() { | |
| 1011 if (this == NULL) { | |
| 1012 tty->print_cr("NULL CodeBuffer pointer"); | |
| 1013 return; | |
| 1014 } | |
| 1015 | |
| 1016 tty->print_cr("CodeBuffer:"); | |
| 1017 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 1018 // print each section | |
| 1019 CodeSection* cs = code_section(n); | |
| 1020 cs->print(code_section_name(n)); | |
| 1021 } | |
| 1022 } | |
| 1023 | |
| 1024 #endif // PRODUCT |