Mercurial > hg > truffle
annotate src/share/vm/asm/codeBuffer.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | b31471cdc53e |
| rev | line source |
|---|---|
| 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 #include "precompiled.hpp" |
| 26 #include "asm/codeBuffer.hpp" | |
| 27 #include "compiler/disassembler.hpp" | |
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28 #include "memory/gcLocker.hpp" |
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29 #include "oops/methodData.hpp" |
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30 #include "oops/oop.inline.hpp" |
| 1972 | 31 #include "utilities/copy.hpp" |
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32 #include "utilities/xmlstream.hpp" |
| 0 | 33 |
| 34 // The structure of a CodeSection: | |
| 35 // | |
| 36 // _start -> +----------------+ | |
| 37 // | machine code...| | |
| 38 // _end -> |----------------| | |
| 39 // | | | |
| 40 // | (empty) | | |
| 41 // | | | |
| 42 // | | | |
| 43 // +----------------+ | |
| 44 // _limit -> | | | |
| 45 // | |
| 46 // _locs_start -> +----------------+ | |
| 47 // |reloc records...| | |
| 48 // |----------------| | |
| 49 // _locs_end -> | | | |
| 50 // | | | |
| 51 // | (empty) | | |
| 52 // | | | |
| 53 // | | | |
| 54 // +----------------+ | |
| 55 // _locs_limit -> | | | |
| 56 // The _end (resp. _limit) pointer refers to the first | |
| 57 // unused (resp. unallocated) byte. | |
| 58 | |
| 59 // The structure of the CodeBuffer while code is being accumulated: | |
| 60 // | |
| 61 // _total_start -> \ | |
| 62 // _insts._start -> +----------------+ | |
| 63 // | | | |
| 64 // | Code | | |
| 65 // | | | |
| 66 // _stubs._start -> |----------------| | |
| 67 // | | | |
| 68 // | Stubs | (also handlers for deopt/exception) | |
| 69 // | | | |
| 70 // _consts._start -> |----------------| | |
| 71 // | | | |
| 72 // | Constants | | |
| 73 // | | | |
| 74 // +----------------+ | |
| 75 // + _total_size -> | | | |
| 76 // | |
| 77 // When the code and relocations are copied to the code cache, | |
| 78 // the empty parts of each section are removed, and everything | |
| 79 // is copied into contiguous locations. | |
| 80 | |
| 81 typedef CodeBuffer::csize_t csize_t; // file-local definition | |
| 82 | |
| 1748 | 83 // External buffer, in a predefined CodeBlob. |
| 0 | 84 // Important: The code_start must be taken exactly, and not realigned. |
| 1748 | 85 CodeBuffer::CodeBuffer(CodeBlob* blob) { |
| 0 | 86 initialize_misc("static buffer"); |
| 1748 | 87 initialize(blob->content_begin(), blob->content_size()); |
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88 verify_section_allocation(); |
| 0 | 89 } |
| 90 | |
| 91 void CodeBuffer::initialize(csize_t code_size, csize_t locs_size) { | |
| 92 // Compute maximal alignment. | |
| 93 int align = _insts.alignment(); | |
| 94 // Always allow for empty slop around each section. | |
| 95 int slop = (int) CodeSection::end_slop(); | |
| 96 | |
| 97 assert(blob() == NULL, "only once"); | |
| 98 set_blob(BufferBlob::create(_name, code_size + (align+slop) * (SECT_LIMIT+1))); | |
| 99 if (blob() == NULL) { | |
| 100 // The assembler constructor will throw a fatal on an empty CodeBuffer. | |
| 101 return; // caller must test this | |
| 102 } | |
| 103 | |
| 104 // Set up various pointers into the blob. | |
| 105 initialize(_total_start, _total_size); | |
| 106 | |
| 1748 | 107 assert((uintptr_t)insts_begin() % CodeEntryAlignment == 0, "instruction start not code entry aligned"); |
| 0 | 108 |
| 109 pd_initialize(); | |
| 110 | |
| 111 if (locs_size != 0) { | |
| 112 _insts.initialize_locs(locs_size / sizeof(relocInfo)); | |
| 113 } | |
| 114 | |
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115 verify_section_allocation(); |
| 0 | 116 } |
| 117 | |
| 118 | |
| 119 CodeBuffer::~CodeBuffer() { | |
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120 verify_section_allocation(); |
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121 |
| 0 | 122 // If we allocate our code buffer from the CodeCache |
| 123 // via a BufferBlob, and it's not permanent, then | |
| 124 // free the BufferBlob. | |
| 125 // The rest of the memory will be freed when the ResourceObj | |
| 126 // is released. | |
| 127 for (CodeBuffer* cb = this; cb != NULL; cb = cb->before_expand()) { | |
| 128 // Previous incarnations of this buffer are held live, so that internal | |
| 129 // addresses constructed before expansions will not be confused. | |
| 130 cb->free_blob(); | |
| 131 } | |
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132 |
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133 // free any overflow storage |
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134 delete _overflow_arena; |
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135 |
| 0 | 136 #ifdef ASSERT |
| 1685 | 137 // Save allocation type to execute assert in ~ResourceObj() |
| 138 // which is called after this destructor. | |
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139 assert(_default_oop_recorder.allocated_on_stack(), "should be embedded object"); |
| 1685 | 140 ResourceObj::allocation_type at = _default_oop_recorder.get_allocation_type(); |
| 0 | 141 Copy::fill_to_bytes(this, sizeof(*this), badResourceValue); |
| 1685 | 142 ResourceObj::set_allocation_type((address)(&_default_oop_recorder), at); |
| 0 | 143 #endif |
| 144 } | |
| 145 | |
| 146 void CodeBuffer::initialize_oop_recorder(OopRecorder* r) { | |
| 147 assert(_oop_recorder == &_default_oop_recorder && _default_oop_recorder.is_unused(), "do this once"); | |
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148 DEBUG_ONLY(_default_oop_recorder.freeze()); // force unused OR to be frozen |
| 0 | 149 _oop_recorder = r; |
| 150 } | |
| 151 | |
| 152 void CodeBuffer::initialize_section_size(CodeSection* cs, csize_t size) { | |
| 153 assert(cs != &_insts, "insts is the memory provider, not the consumer"); | |
| 154 csize_t slop = CodeSection::end_slop(); // margin between sections | |
| 155 int align = cs->alignment(); | |
| 156 assert(is_power_of_2(align), "sanity"); | |
| 157 address start = _insts._start; | |
| 158 address limit = _insts._limit; | |
| 159 address middle = limit - size; | |
| 160 middle -= (intptr_t)middle & (align-1); // align the division point downward | |
| 161 guarantee(middle - slop > start, "need enough space to divide up"); | |
| 162 _insts._limit = middle - slop; // subtract desired space, plus slop | |
| 163 cs->initialize(middle, limit - middle); | |
| 164 assert(cs->start() == middle, "sanity"); | |
| 165 assert(cs->limit() == limit, "sanity"); | |
| 166 // give it some relocations to start with, if the main section has them | |
| 167 if (_insts.has_locs()) cs->initialize_locs(1); | |
| 168 } | |
| 169 | |
| 170 void CodeBuffer::freeze_section(CodeSection* cs) { | |
| 171 CodeSection* next_cs = (cs == consts())? NULL: code_section(cs->index()+1); | |
| 172 csize_t frozen_size = cs->size(); | |
| 173 if (next_cs != NULL) { | |
| 174 frozen_size = next_cs->align_at_start(frozen_size); | |
| 175 } | |
| 176 address old_limit = cs->limit(); | |
| 177 address new_limit = cs->start() + frozen_size; | |
| 178 relocInfo* old_locs_limit = cs->locs_limit(); | |
| 179 relocInfo* new_locs_limit = cs->locs_end(); | |
| 180 // Patch the limits. | |
| 181 cs->_limit = new_limit; | |
| 182 cs->_locs_limit = new_locs_limit; | |
| 183 cs->_frozen = true; | |
| 184 if (!next_cs->is_allocated() && !next_cs->is_frozen()) { | |
| 185 // Give remaining buffer space to the following section. | |
| 186 next_cs->initialize(new_limit, old_limit - new_limit); | |
| 187 next_cs->initialize_shared_locs(new_locs_limit, | |
| 188 old_locs_limit - new_locs_limit); | |
| 189 } | |
| 190 } | |
| 191 | |
| 192 void CodeBuffer::set_blob(BufferBlob* blob) { | |
| 193 _blob = blob; | |
| 194 if (blob != NULL) { | |
| 1748 | 195 address start = blob->content_begin(); |
| 196 address end = blob->content_end(); | |
| 0 | 197 // Round up the starting address. |
| 198 int align = _insts.alignment(); | |
| 199 start += (-(intptr_t)start) & (align-1); | |
| 200 _total_start = start; | |
| 201 _total_size = end - start; | |
| 202 } else { | |
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203 #ifdef ASSERT |
| 0 | 204 // Clean out dangling pointers. |
| 205 _total_start = badAddress; | |
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206 _consts._start = _consts._end = badAddress; |
| 0 | 207 _insts._start = _insts._end = badAddress; |
| 208 _stubs._start = _stubs._end = badAddress; | |
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209 #endif //ASSERT |
| 0 | 210 } |
| 211 } | |
| 212 | |
| 213 void CodeBuffer::free_blob() { | |
| 214 if (_blob != NULL) { | |
| 215 BufferBlob::free(_blob); | |
| 216 set_blob(NULL); | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 const char* CodeBuffer::code_section_name(int n) { | |
| 221 #ifdef PRODUCT | |
| 222 return NULL; | |
| 223 #else //PRODUCT | |
| 224 switch (n) { | |
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225 case SECT_CONSTS: return "consts"; |
| 0 | 226 case SECT_INSTS: return "insts"; |
| 227 case SECT_STUBS: return "stubs"; | |
| 228 default: return NULL; | |
| 229 } | |
| 230 #endif //PRODUCT | |
| 231 } | |
| 232 | |
| 233 int CodeBuffer::section_index_of(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)) return n; | |
| 237 } | |
| 238 return SECT_NONE; | |
| 239 } | |
| 240 | |
| 241 int CodeBuffer::locator(address addr) const { | |
| 242 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 243 const CodeSection* cs = code_section(n); | |
| 244 if (cs->allocates(addr)) { | |
| 245 return locator(addr - cs->start(), n); | |
| 246 } | |
| 247 } | |
| 248 return -1; | |
| 249 } | |
| 250 | |
| 251 address CodeBuffer::locator_address(int locator) const { | |
| 252 if (locator < 0) return NULL; | |
| 253 address start = code_section(locator_sect(locator))->start(); | |
| 254 return start + locator_pos(locator); | |
| 255 } | |
| 256 | |
| 257 address CodeBuffer::decode_begin() { | |
| 258 address begin = _insts.start(); | |
| 259 if (_decode_begin != NULL && _decode_begin > begin) | |
| 260 begin = _decode_begin; | |
| 261 return begin; | |
| 262 } | |
| 263 | |
| 264 | |
| 265 GrowableArray<int>* CodeBuffer::create_patch_overflow() { | |
| 266 if (_overflow_arena == NULL) { | |
| 6197 | 267 _overflow_arena = new (mtCode) Arena(); |
| 0 | 268 } |
| 269 return new (_overflow_arena) GrowableArray<int>(_overflow_arena, 8, 0, 0); | |
| 270 } | |
| 271 | |
| 272 | |
| 273 // Helper function for managing labels and their target addresses. | |
| 274 // Returns a sensible address, and if it is not the label's final | |
| 275 // address, notes the dependency (at 'branch_pc') on the label. | |
| 276 address CodeSection::target(Label& L, address branch_pc) { | |
| 277 if (L.is_bound()) { | |
| 278 int loc = L.loc(); | |
| 279 if (index() == CodeBuffer::locator_sect(loc)) { | |
| 280 return start() + CodeBuffer::locator_pos(loc); | |
| 281 } else { | |
| 282 return outer()->locator_address(loc); | |
| 283 } | |
| 284 } else { | |
| 285 assert(allocates2(branch_pc), "sanity"); | |
| 286 address base = start(); | |
| 287 int patch_loc = CodeBuffer::locator(branch_pc - base, index()); | |
| 288 L.add_patch_at(outer(), patch_loc); | |
| 289 | |
| 290 // Need to return a pc, doesn't matter what it is since it will be | |
| 291 // replaced during resolution later. | |
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292 // Don't return NULL or badAddress, since branches shouldn't overflow. |
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293 // Don't return base either because that could overflow displacements |
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294 // for shorter branches. It will get checked when bound. |
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295 return branch_pc; |
| 0 | 296 } |
| 297 } | |
| 298 | |
| 299 void CodeSection::relocate(address at, RelocationHolder const& spec, int format) { | |
| 300 Relocation* reloc = spec.reloc(); | |
| 301 relocInfo::relocType rtype = (relocInfo::relocType) reloc->type(); | |
| 302 if (rtype == relocInfo::none) return; | |
| 303 | |
| 304 // The assertion below has been adjusted, to also work for | |
| 305 // relocation for fixup. Sometimes we want to put relocation | |
| 306 // information for the next instruction, since it will be patched | |
| 307 // with a call. | |
| 308 assert(start() <= at && at <= end()+1, | |
| 309 "cannot relocate data outside code boundaries"); | |
| 310 | |
| 311 if (!has_locs()) { | |
| 312 // no space for relocation information provided => code cannot be | |
| 313 // relocated. Make sure that relocate is only called with rtypes | |
| 314 // that can be ignored for this kind of code. | |
| 315 assert(rtype == relocInfo::none || | |
| 316 rtype == relocInfo::runtime_call_type || | |
| 317 rtype == relocInfo::internal_word_type|| | |
| 318 rtype == relocInfo::section_word_type || | |
| 319 rtype == relocInfo::external_word_type, | |
| 320 "code needs relocation information"); | |
| 321 // leave behind an indication that we attempted a relocation | |
| 322 DEBUG_ONLY(_locs_start = _locs_limit = (relocInfo*)badAddress); | |
| 323 return; | |
| 324 } | |
| 325 | |
| 326 // Advance the point, noting the offset we'll have to record. | |
| 327 csize_t offset = at - locs_point(); | |
| 328 set_locs_point(at); | |
| 329 | |
| 330 // Test for a couple of overflow conditions; maybe expand the buffer. | |
| 331 relocInfo* end = locs_end(); | |
| 332 relocInfo* req = end + relocInfo::length_limit; | |
| 333 // Check for (potential) overflow | |
| 334 if (req >= locs_limit() || offset >= relocInfo::offset_limit()) { | |
| 335 req += (uint)offset / (uint)relocInfo::offset_limit(); | |
| 336 if (req >= locs_limit()) { | |
| 337 // Allocate or reallocate. | |
| 338 expand_locs(locs_count() + (req - end)); | |
| 339 // reload pointer | |
| 340 end = locs_end(); | |
| 341 } | |
| 342 } | |
| 343 | |
| 344 // If the offset is giant, emit filler relocs, of type 'none', but | |
| 345 // each carrying the largest possible offset, to advance the locs_point. | |
| 346 while (offset >= relocInfo::offset_limit()) { | |
| 347 assert(end < locs_limit(), "adjust previous paragraph of code"); | |
| 348 *end++ = filler_relocInfo(); | |
| 349 offset -= filler_relocInfo().addr_offset(); | |
| 350 } | |
| 351 | |
| 352 // If it's a simple reloc with no data, we'll just write (rtype | offset). | |
| 353 (*end) = relocInfo(rtype, offset, format); | |
| 354 | |
| 355 // If it has data, insert the prefix, as (data_prefix_tag | data1), data2. | |
| 356 end->initialize(this, reloc); | |
| 357 } | |
| 358 | |
| 359 void CodeSection::initialize_locs(int locs_capacity) { | |
| 360 assert(_locs_start == NULL, "only one locs init step, please"); | |
| 361 // Apply a priori lower limits to relocation size: | |
| 362 csize_t min_locs = MAX2(size() / 16, (csize_t)4); | |
| 363 if (locs_capacity < min_locs) locs_capacity = min_locs; | |
| 364 relocInfo* locs_start = NEW_RESOURCE_ARRAY(relocInfo, locs_capacity); | |
| 365 _locs_start = locs_start; | |
| 366 _locs_end = locs_start; | |
| 367 _locs_limit = locs_start + locs_capacity; | |
| 368 _locs_own = true; | |
| 369 } | |
| 370 | |
| 371 void CodeSection::initialize_shared_locs(relocInfo* buf, int length) { | |
| 372 assert(_locs_start == NULL, "do this before locs are allocated"); | |
| 373 // Internal invariant: locs buf must be fully aligned. | |
| 374 // See copy_relocations_to() below. | |
| 375 while ((uintptr_t)buf % HeapWordSize != 0 && length > 0) { | |
| 376 ++buf; --length; | |
| 377 } | |
| 378 if (length > 0) { | |
| 379 _locs_start = buf; | |
| 380 _locs_end = buf; | |
| 381 _locs_limit = buf + length; | |
| 382 _locs_own = false; | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 void CodeSection::initialize_locs_from(const CodeSection* source_cs) { | |
| 387 int lcount = source_cs->locs_count(); | |
| 388 if (lcount != 0) { | |
| 389 initialize_shared_locs(source_cs->locs_start(), lcount); | |
| 390 _locs_end = _locs_limit = _locs_start + lcount; | |
| 391 assert(is_allocated(), "must have copied code already"); | |
| 392 set_locs_point(start() + source_cs->locs_point_off()); | |
| 393 } | |
| 394 assert(this->locs_count() == source_cs->locs_count(), "sanity"); | |
| 395 } | |
| 396 | |
| 397 void CodeSection::expand_locs(int new_capacity) { | |
| 398 if (_locs_start == NULL) { | |
| 399 initialize_locs(new_capacity); | |
| 400 return; | |
| 401 } else { | |
| 402 int old_count = locs_count(); | |
| 403 int old_capacity = locs_capacity(); | |
| 404 if (new_capacity < old_capacity * 2) | |
| 405 new_capacity = old_capacity * 2; | |
| 406 relocInfo* locs_start; | |
| 407 if (_locs_own) { | |
| 408 locs_start = REALLOC_RESOURCE_ARRAY(relocInfo, _locs_start, old_capacity, new_capacity); | |
| 409 } else { | |
| 410 locs_start = NEW_RESOURCE_ARRAY(relocInfo, new_capacity); | |
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411 Copy::conjoint_jbytes(_locs_start, locs_start, old_capacity * sizeof(relocInfo)); |
| 0 | 412 _locs_own = true; |
| 413 } | |
| 414 _locs_start = locs_start; | |
| 415 _locs_end = locs_start + old_count; | |
| 416 _locs_limit = locs_start + new_capacity; | |
| 417 } | |
| 418 } | |
| 419 | |
| 420 | |
| 421 /// Support for emitting the code to its final location. | |
| 422 /// The pattern is the same for all functions. | |
| 423 /// We iterate over all the sections, padding each to alignment. | |
| 424 | |
| 1748 | 425 csize_t CodeBuffer::total_content_size() const { |
| 426 csize_t size_so_far = 0; | |
| 0 | 427 for (int n = 0; n < (int)SECT_LIMIT; n++) { |
| 428 const CodeSection* cs = code_section(n); | |
| 429 if (cs->is_empty()) continue; // skip trivial section | |
| 1748 | 430 size_so_far = cs->align_at_start(size_so_far); |
| 431 size_so_far += cs->size(); | |
| 0 | 432 } |
| 1748 | 433 return size_so_far; |
| 0 | 434 } |
| 435 | |
| 436 void CodeBuffer::compute_final_layout(CodeBuffer* dest) const { | |
| 437 address buf = dest->_total_start; | |
| 438 csize_t buf_offset = 0; | |
| 1748 | 439 assert(dest->_total_size >= total_content_size(), "must be big enough"); |
| 0 | 440 |
| 441 { | |
| 442 // not sure why this is here, but why not... | |
| 443 int alignSize = MAX2((intx) sizeof(jdouble), CodeEntryAlignment); | |
| 444 assert( (dest->_total_start - _insts.start()) % alignSize == 0, "copy must preserve alignment"); | |
| 445 } | |
| 446 | |
| 447 const CodeSection* prev_cs = NULL; | |
| 448 CodeSection* prev_dest_cs = NULL; | |
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449 |
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450 for (int n = (int) SECT_FIRST; n < (int) SECT_LIMIT; n++) { |
| 0 | 451 // figure compact layout of each section |
| 452 const CodeSection* cs = code_section(n); | |
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453 csize_t csize = cs->size(); |
| 0 | 454 |
| 455 CodeSection* dest_cs = dest->code_section(n); | |
| 456 if (!cs->is_empty()) { | |
| 457 // Compute initial padding; assign it to the previous non-empty guy. | |
| 458 // Cf. figure_expanded_capacities. | |
| 459 csize_t padding = cs->align_at_start(buf_offset) - buf_offset; | |
| 460 if (padding != 0) { | |
| 461 buf_offset += padding; | |
| 462 assert(prev_dest_cs != NULL, "sanity"); | |
| 463 prev_dest_cs->_limit += padding; | |
| 464 } | |
| 465 #ifdef ASSERT | |
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466 if (prev_cs != NULL && prev_cs->is_frozen() && n < (SECT_LIMIT - 1)) { |
| 0 | 467 // Make sure the ends still match up. |
| 468 // This is important because a branch in a frozen section | |
| 469 // might target code in a following section, via a Label, | |
| 470 // and without a relocation record. See Label::patch_instructions. | |
| 471 address dest_start = buf+buf_offset; | |
| 472 csize_t start2start = cs->start() - prev_cs->start(); | |
| 473 csize_t dest_start2start = dest_start - prev_dest_cs->start(); | |
| 474 assert(start2start == dest_start2start, "cannot stretch frozen sect"); | |
| 475 } | |
| 476 #endif //ASSERT | |
| 477 prev_dest_cs = dest_cs; | |
| 478 prev_cs = cs; | |
| 479 } | |
| 480 | |
| 481 debug_only(dest_cs->_start = NULL); // defeat double-initialization assert | |
| 482 dest_cs->initialize(buf+buf_offset, csize); | |
| 483 dest_cs->set_end(buf+buf_offset+csize); | |
| 484 assert(dest_cs->is_allocated(), "must always be allocated"); | |
| 485 assert(cs->is_empty() == dest_cs->is_empty(), "sanity"); | |
| 486 | |
| 487 buf_offset += csize; | |
| 488 } | |
| 489 | |
| 490 // Done calculating sections; did it come out to the right end? | |
| 1748 | 491 assert(buf_offset == total_content_size(), "sanity"); |
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492 dest->verify_section_allocation(); |
| 0 | 493 } |
| 494 | |
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495 void CodeBuffer::finalize_oop_references(methodHandle mh) { |
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496 No_Safepoint_Verifier nsv; |
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497 |
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498 GrowableArray<oop> oops; |
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499 |
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500 // Make sure that immediate metadata records something in the OopRecorder |
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501 for (int n = (int) SECT_FIRST; n < (int) SECT_LIMIT; n++) { |
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502 // pull code out of each section |
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503 CodeSection* cs = code_section(n); |
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504 if (cs->is_empty()) continue; // skip trivial section |
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505 RelocIterator iter(cs); |
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506 while (iter.next()) { |
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507 if (iter.type() == relocInfo::metadata_type) { |
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508 metadata_Relocation* md = iter.metadata_reloc(); |
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509 if (md->metadata_is_immediate()) { |
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510 Metadata* m = md->metadata_value(); |
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511 if (oop_recorder()->is_real(m)) { |
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512 oop o = NULL; |
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513 if (m->is_methodData()) { |
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514 m = ((MethodData*)m)->method(); |
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515 } |
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516 if (m->is_method()) { |
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517 m = ((Method*)m)->method_holder(); |
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518 } |
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519 if (m->is_klass()) { |
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520 o = ((Klass*)m)->class_loader(); |
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521 } else { |
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522 // XXX This will currently occur for MDO which don't |
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523 // have a backpointer. This has to be fixed later. |
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524 m->print(); |
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525 ShouldNotReachHere(); |
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526 } |
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527 if (o != NULL && oops.find(o) == -1) { |
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528 oops.append(o); |
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529 } |
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530 } |
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531 } |
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532 } |
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533 } |
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534 } |
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535 |
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536 if (!oop_recorder()->is_unused()) { |
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537 for (int i = 0; i < oop_recorder()->metadata_count(); i++) { |
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538 Metadata* m = oop_recorder()->metadata_at(i); |
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539 if (oop_recorder()->is_real(m)) { |
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540 oop o = NULL; |
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541 if (m->is_methodData()) { |
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542 m = ((MethodData*)m)->method(); |
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543 } |
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544 if (m->is_method()) { |
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545 m = ((Method*)m)->method_holder(); |
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546 } |
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547 if (m->is_klass()) { |
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548 o = ((Klass*)m)->class_loader(); |
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549 } else { |
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550 m->print(); |
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551 ShouldNotReachHere(); |
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552 } |
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553 if (o != NULL && oops.find(o) == -1) { |
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554 oops.append(o); |
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555 } |
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556 } |
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557 } |
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558 |
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559 } |
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560 |
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561 // Add the class loader of Method* for the nmethod itself |
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562 oop cl = mh->method_holder()->class_loader(); |
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563 if (cl != NULL) { |
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564 oops.append(cl); |
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565 } |
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566 |
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567 // Add any oops that we've found |
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568 Thread* thread = Thread::current(); |
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569 for (int i = 0; i < oops.length(); i++) { |
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570 oop_recorder()->find_index((jobject)thread->handle_area()->allocate_handle(oops.at(i))); |
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571 } |
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572 } |
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573 |
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574 |
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575 |
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576 csize_t CodeBuffer::total_offset_of(CodeSection* cs) const { |
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577 csize_t size_so_far = 0; |
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578 for (int n = (int) SECT_FIRST; n < (int) SECT_LIMIT; n++) { |
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579 const CodeSection* cur_cs = code_section(n); |
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580 if (!cur_cs->is_empty()) { |
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581 size_so_far = cur_cs->align_at_start(size_so_far); |
| 0 | 582 } |
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583 if (cur_cs->index() == cs->index()) { |
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584 return size_so_far; |
| 0 | 585 } |
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586 size_so_far += cur_cs->size(); |
| 0 | 587 } |
| 588 ShouldNotReachHere(); | |
| 589 return -1; | |
| 590 } | |
| 591 | |
| 592 csize_t CodeBuffer::total_relocation_size() const { | |
| 593 csize_t lsize = copy_relocations_to(NULL); // dry run only | |
| 1748 | 594 csize_t csize = total_content_size(); |
| 0 | 595 csize_t total = RelocIterator::locs_and_index_size(csize, lsize); |
| 596 return (csize_t) align_size_up(total, HeapWordSize); | |
| 597 } | |
| 598 | |
| 599 csize_t CodeBuffer::copy_relocations_to(CodeBlob* dest) const { | |
| 600 address buf = NULL; | |
| 601 csize_t buf_offset = 0; | |
| 602 csize_t buf_limit = 0; | |
| 603 if (dest != NULL) { | |
| 604 buf = (address)dest->relocation_begin(); | |
| 605 buf_limit = (address)dest->relocation_end() - buf; | |
| 606 assert((uintptr_t)buf % HeapWordSize == 0, "buf must be fully aligned"); | |
| 607 assert(buf_limit % HeapWordSize == 0, "buf must be evenly sized"); | |
| 608 } | |
| 609 // if dest == NULL, this is just the sizing pass | |
| 610 | |
| 611 csize_t code_end_so_far = 0; | |
| 612 csize_t code_point_so_far = 0; | |
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613 for (int n = (int) SECT_FIRST; n < (int)SECT_LIMIT; n++) { |
| 0 | 614 // pull relocs out of each section |
| 615 const CodeSection* cs = code_section(n); | |
| 616 assert(!(cs->is_empty() && cs->locs_count() > 0), "sanity"); | |
| 617 if (cs->is_empty()) continue; // skip trivial section | |
| 618 relocInfo* lstart = cs->locs_start(); | |
| 619 relocInfo* lend = cs->locs_end(); | |
| 620 csize_t lsize = (csize_t)( (address)lend - (address)lstart ); | |
| 621 csize_t csize = cs->size(); | |
| 622 code_end_so_far = cs->align_at_start(code_end_so_far); | |
| 623 | |
| 624 if (lsize > 0) { | |
| 625 // Figure out how to advance the combined relocation point | |
| 626 // first to the beginning of this section. | |
| 627 // We'll insert one or more filler relocs to span that gap. | |
| 628 // (Don't bother to improve this by editing the first reloc's offset.) | |
| 629 csize_t new_code_point = code_end_so_far; | |
| 630 for (csize_t jump; | |
| 631 code_point_so_far < new_code_point; | |
| 632 code_point_so_far += jump) { | |
| 633 jump = new_code_point - code_point_so_far; | |
| 634 relocInfo filler = filler_relocInfo(); | |
| 635 if (jump >= filler.addr_offset()) { | |
| 636 jump = filler.addr_offset(); | |
| 637 } else { // else shrink the filler to fit | |
| 638 filler = relocInfo(relocInfo::none, jump); | |
| 639 } | |
| 640 if (buf != NULL) { | |
| 641 assert(buf_offset + (csize_t)sizeof(filler) <= buf_limit, "filler in bounds"); | |
| 642 *(relocInfo*)(buf+buf_offset) = filler; | |
| 643 } | |
| 644 buf_offset += sizeof(filler); | |
| 645 } | |
| 646 | |
| 647 // Update code point and end to skip past this section: | |
| 648 csize_t last_code_point = code_end_so_far + cs->locs_point_off(); | |
| 649 assert(code_point_so_far <= last_code_point, "sanity"); | |
| 650 code_point_so_far = last_code_point; // advance past this guy's relocs | |
| 651 } | |
| 652 code_end_so_far += csize; // advance past this guy's instructions too | |
| 653 | |
| 654 // Done with filler; emit the real relocations: | |
| 655 if (buf != NULL && lsize != 0) { | |
| 656 assert(buf_offset + lsize <= buf_limit, "target in bounds"); | |
| 657 assert((uintptr_t)lstart % HeapWordSize == 0, "sane start"); | |
| 658 if (buf_offset % HeapWordSize == 0) { | |
| 659 // Use wordwise copies if possible: | |
| 660 Copy::disjoint_words((HeapWord*)lstart, | |
| 661 (HeapWord*)(buf+buf_offset), | |
| 662 (lsize + HeapWordSize-1) / HeapWordSize); | |
| 663 } else { | |
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664 Copy::conjoint_jbytes(lstart, buf+buf_offset, lsize); |
| 0 | 665 } |
| 666 } | |
| 667 buf_offset += lsize; | |
| 668 } | |
| 669 | |
| 670 // Align end of relocation info in target. | |
| 671 while (buf_offset % HeapWordSize != 0) { | |
| 672 if (buf != NULL) { | |
| 673 relocInfo padding = relocInfo(relocInfo::none, 0); | |
| 674 assert(buf_offset + (csize_t)sizeof(padding) <= buf_limit, "padding in bounds"); | |
| 675 *(relocInfo*)(buf+buf_offset) = padding; | |
| 676 } | |
| 677 buf_offset += sizeof(relocInfo); | |
| 678 } | |
| 679 | |
| 1748 | 680 assert(code_end_so_far == total_content_size(), "sanity"); |
| 0 | 681 |
| 682 // Account for index: | |
| 683 if (buf != NULL) { | |
| 684 RelocIterator::create_index(dest->relocation_begin(), | |
| 685 buf_offset / sizeof(relocInfo), | |
| 686 dest->relocation_end()); | |
| 687 } | |
| 688 | |
| 689 return buf_offset; | |
| 690 } | |
| 691 | |
| 692 void CodeBuffer::copy_code_to(CodeBlob* dest_blob) { | |
| 693 #ifndef PRODUCT | |
| 694 if (PrintNMethods && (WizardMode || Verbose)) { | |
| 695 tty->print("done with CodeBuffer:"); | |
| 696 ((CodeBuffer*)this)->print(); | |
| 697 } | |
| 698 #endif //PRODUCT | |
| 699 | |
| 1748 | 700 CodeBuffer dest(dest_blob); |
| 701 assert(dest_blob->content_size() >= total_content_size(), "good sizing"); | |
| 0 | 702 this->compute_final_layout(&dest); |
| 703 relocate_code_to(&dest); | |
| 704 | |
| 705 // transfer comments from buffer to blob | |
| 706 dest_blob->set_comments(_comments); | |
| 707 | |
| 708 // Done moving code bytes; were they the right size? | |
| 1748 | 709 assert(round_to(dest.total_content_size(), oopSize) == dest_blob->content_size(), "sanity"); |
| 0 | 710 |
| 711 // Flush generated code | |
| 1748 | 712 ICache::invalidate_range(dest_blob->code_begin(), dest_blob->code_size()); |
| 0 | 713 } |
| 714 | |
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715 // Move all my code into another code buffer. Consult applicable |
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716 // relocs to repair embedded addresses. The layout in the destination |
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717 // CodeBuffer is different to the source CodeBuffer: the destination |
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718 // CodeBuffer gets the final layout (consts, insts, stubs in order of |
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719 // ascending address). |
| 0 | 720 void CodeBuffer::relocate_code_to(CodeBuffer* dest) const { |
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721 address dest_end = dest->_total_start + dest->_total_size; |
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722 address dest_filled = NULL; |
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723 for (int n = (int) SECT_FIRST; n < (int) SECT_LIMIT; n++) { |
| 0 | 724 // pull code out of each section |
| 725 const CodeSection* cs = code_section(n); | |
| 726 if (cs->is_empty()) continue; // skip trivial section | |
| 727 CodeSection* dest_cs = dest->code_section(n); | |
| 728 assert(cs->size() == dest_cs->size(), "sanity"); | |
| 729 csize_t usize = dest_cs->size(); | |
| 730 csize_t wsize = align_size_up(usize, HeapWordSize); | |
| 731 assert(dest_cs->start() + wsize <= dest_end, "no overflow"); | |
| 732 // Copy the code as aligned machine words. | |
| 733 // This may also include an uninitialized partial word at the end. | |
| 734 Copy::disjoint_words((HeapWord*)cs->start(), | |
| 735 (HeapWord*)dest_cs->start(), | |
| 736 wsize / HeapWordSize); | |
| 737 | |
| 738 if (dest->blob() == NULL) { | |
| 739 // Destination is a final resting place, not just another buffer. | |
| 740 // Normalize uninitialized bytes in the final padding. | |
| 741 Copy::fill_to_bytes(dest_cs->end(), dest_cs->remaining(), | |
| 742 Assembler::code_fill_byte()); | |
| 743 } | |
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744 // Keep track of the highest filled address |
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745 dest_filled = MAX2(dest_filled, dest_cs->end() + dest_cs->remaining()); |
| 0 | 746 |
| 747 assert(cs->locs_start() != (relocInfo*)badAddress, | |
| 748 "this section carries no reloc storage, but reloc was attempted"); | |
| 749 | |
| 750 // Make the new code copy use the old copy's relocations: | |
| 751 dest_cs->initialize_locs_from(cs); | |
| 752 | |
| 753 { // Repair the pc relative information in the code after the move | |
| 754 RelocIterator iter(dest_cs); | |
| 755 while (iter.next()) { | |
| 756 iter.reloc()->fix_relocation_after_move(this, dest); | |
| 757 } | |
| 758 } | |
| 759 } | |
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760 |
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761 if (dest->blob() == NULL) { |
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762 // Destination is a final resting place, not just another buffer. |
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763 // Normalize uninitialized bytes in the final padding. |
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764 Copy::fill_to_bytes(dest_filled, dest_end - dest_filled, |
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765 Assembler::code_fill_byte()); |
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766 |
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767 } |
| 0 | 768 } |
| 769 | |
| 770 csize_t CodeBuffer::figure_expanded_capacities(CodeSection* which_cs, | |
| 771 csize_t amount, | |
| 772 csize_t* new_capacity) { | |
| 773 csize_t new_total_cap = 0; | |
| 774 | |
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775 for (int n = (int) SECT_FIRST; n < (int) SECT_LIMIT; n++) { |
| 0 | 776 const CodeSection* sect = code_section(n); |
| 777 | |
| 778 if (!sect->is_empty()) { | |
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779 // Compute initial padding; assign it to the previous section, |
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780 // even if it's empty (e.g. consts section can be empty). |
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781 // Cf. compute_final_layout |
| 0 | 782 csize_t padding = sect->align_at_start(new_total_cap) - new_total_cap; |
| 783 if (padding != 0) { | |
| 784 new_total_cap += padding; | |
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785 assert(n - 1 >= SECT_FIRST, "sanity"); |
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786 new_capacity[n - 1] += padding; |
| 0 | 787 } |
| 788 } | |
| 789 | |
| 790 csize_t exp = sect->size(); // 100% increase | |
| 791 if ((uint)exp < 4*K) exp = 4*K; // minimum initial increase | |
| 792 if (sect == which_cs) { | |
| 793 if (exp < amount) exp = amount; | |
| 794 if (StressCodeBuffers) exp = amount; // expand only slightly | |
| 795 } else if (n == SECT_INSTS) { | |
| 796 // scale down inst increases to a more modest 25% | |
| 797 exp = 4*K + ((exp - 4*K) >> 2); | |
| 798 if (StressCodeBuffers) exp = amount / 2; // expand only slightly | |
| 799 } else if (sect->is_empty()) { | |
| 800 // do not grow an empty secondary section | |
| 801 exp = 0; | |
| 802 } | |
| 803 // Allow for inter-section slop: | |
| 804 exp += CodeSection::end_slop(); | |
| 805 csize_t new_cap = sect->size() + exp; | |
| 806 if (new_cap < sect->capacity()) { | |
| 807 // No need to expand after all. | |
| 808 new_cap = sect->capacity(); | |
| 809 } | |
| 810 new_capacity[n] = new_cap; | |
| 811 new_total_cap += new_cap; | |
| 812 } | |
| 813 | |
| 814 return new_total_cap; | |
| 815 } | |
| 816 | |
| 817 void CodeBuffer::expand(CodeSection* which_cs, csize_t amount) { | |
| 818 #ifndef PRODUCT | |
| 819 if (PrintNMethods && (WizardMode || Verbose)) { | |
| 820 tty->print("expanding CodeBuffer:"); | |
| 821 this->print(); | |
| 822 } | |
| 823 | |
| 824 if (StressCodeBuffers && blob() != NULL) { | |
| 825 static int expand_count = 0; | |
| 826 if (expand_count >= 0) expand_count += 1; | |
| 827 if (expand_count > 100 && is_power_of_2(expand_count)) { | |
| 828 tty->print_cr("StressCodeBuffers: have expanded %d times", expand_count); | |
| 829 // simulate an occasional allocation failure: | |
| 830 free_blob(); | |
| 831 } | |
| 832 } | |
| 833 #endif //PRODUCT | |
| 834 | |
| 835 // Resizing must be allowed | |
| 836 { | |
| 837 if (blob() == NULL) return; // caller must check for blob == NULL | |
| 838 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 839 guarantee(!code_section(n)->is_frozen(), "resizing not allowed when frozen"); | |
| 840 } | |
| 841 } | |
| 842 | |
| 843 // Figure new capacity for each section. | |
| 844 csize_t new_capacity[SECT_LIMIT]; | |
| 845 csize_t new_total_cap | |
| 846 = figure_expanded_capacities(which_cs, amount, new_capacity); | |
| 847 | |
| 848 // Create a new (temporary) code buffer to hold all the new data | |
| 849 CodeBuffer cb(name(), new_total_cap, 0); | |
| 850 if (cb.blob() == NULL) { | |
| 851 // Failed to allocate in code cache. | |
| 852 free_blob(); | |
| 853 return; | |
| 854 } | |
| 855 | |
| 856 // Create an old code buffer to remember which addresses used to go where. | |
| 857 // This will be useful when we do final assembly into the code cache, | |
| 858 // because we will need to know how to warp any internal address that | |
| 859 // has been created at any time in this CodeBuffer's past. | |
| 860 CodeBuffer* bxp = new CodeBuffer(_total_start, _total_size); | |
| 861 bxp->take_over_code_from(this); // remember the old undersized blob | |
| 862 DEBUG_ONLY(this->_blob = NULL); // silence a later assert | |
| 863 bxp->_before_expand = this->_before_expand; | |
| 864 this->_before_expand = bxp; | |
| 865 | |
| 866 // Give each section its required (expanded) capacity. | |
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867 for (int n = (int)SECT_LIMIT-1; n >= SECT_FIRST; n--) { |
| 0 | 868 CodeSection* cb_sect = cb.code_section(n); |
| 869 CodeSection* this_sect = code_section(n); | |
| 870 if (new_capacity[n] == 0) continue; // already nulled out | |
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871 if (n != SECT_INSTS) { |
| 0 | 872 cb.initialize_section_size(cb_sect, new_capacity[n]); |
| 873 } | |
| 874 assert(cb_sect->capacity() >= new_capacity[n], "big enough"); | |
| 875 address cb_start = cb_sect->start(); | |
| 876 cb_sect->set_end(cb_start + this_sect->size()); | |
| 877 if (this_sect->mark() == NULL) { | |
| 878 cb_sect->clear_mark(); | |
| 879 } else { | |
| 880 cb_sect->set_mark(cb_start + this_sect->mark_off()); | |
| 881 } | |
| 882 } | |
| 883 | |
| 884 // Move all the code and relocations to the new blob: | |
| 885 relocate_code_to(&cb); | |
| 886 | |
| 887 // Copy the temporary code buffer into the current code buffer. | |
| 888 // Basically, do {*this = cb}, except for some control information. | |
| 889 this->take_over_code_from(&cb); | |
| 890 cb.set_blob(NULL); | |
| 891 | |
| 892 // Zap the old code buffer contents, to avoid mistakenly using them. | |
| 893 debug_only(Copy::fill_to_bytes(bxp->_total_start, bxp->_total_size, | |
| 894 badCodeHeapFreeVal)); | |
| 895 | |
| 896 _decode_begin = NULL; // sanity | |
| 897 | |
| 898 // Make certain that the new sections are all snugly inside the new blob. | |
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899 verify_section_allocation(); |
| 0 | 900 |
| 901 #ifndef PRODUCT | |
| 902 if (PrintNMethods && (WizardMode || Verbose)) { | |
| 903 tty->print("expanded CodeBuffer:"); | |
| 904 this->print(); | |
| 905 } | |
| 906 #endif //PRODUCT | |
| 907 } | |
| 908 | |
| 909 void CodeBuffer::take_over_code_from(CodeBuffer* cb) { | |
| 910 // Must already have disposed of the old blob somehow. | |
| 911 assert(blob() == NULL, "must be empty"); | |
| 912 #ifdef ASSERT | |
| 913 | |
| 914 #endif | |
| 915 // Take the new blob away from cb. | |
| 916 set_blob(cb->blob()); | |
| 917 // Take over all the section pointers. | |
| 918 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 919 CodeSection* cb_sect = cb->code_section(n); | |
| 920 CodeSection* this_sect = code_section(n); | |
| 921 this_sect->take_over_code_from(cb_sect); | |
| 922 } | |
| 923 _overflow_arena = cb->_overflow_arena; | |
| 924 // Make sure the old cb won't try to use it or free it. | |
| 925 DEBUG_ONLY(cb->_blob = (BufferBlob*)badAddress); | |
| 926 } | |
| 927 | |
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928 void CodeBuffer::verify_section_allocation() { |
| 0 | 929 address tstart = _total_start; |
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930 if (tstart == badAddress) return; // smashed by set_blob(NULL) |
| 0 | 931 address tend = tstart + _total_size; |
| 932 if (_blob != NULL) { | |
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933 |
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934 guarantee(tstart >= _blob->content_begin(), "sanity"); |
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935 guarantee(tend <= _blob->content_end(), "sanity"); |
| 0 | 936 } |
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937 // Verify disjointness. |
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938 for (int n = (int) SECT_FIRST; n < (int) SECT_LIMIT; n++) { |
| 0 | 939 CodeSection* sect = code_section(n); |
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940 if (!sect->is_allocated() || sect->is_empty()) continue; |
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941 guarantee((intptr_t)sect->start() % sect->alignment() == 0 |
| 0 | 942 || sect->is_empty() || _blob == NULL, |
| 943 "start is aligned"); | |
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944 for (int m = (int) SECT_FIRST; m < (int) SECT_LIMIT; m++) { |
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945 CodeSection* other = code_section(m); |
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946 if (!other->is_allocated() || other == sect) continue; |
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947 guarantee(!other->contains(sect->start() ), "sanity"); |
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948 // limit is an exclusive address and can be the start of another |
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949 // section. |
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950 guarantee(!other->contains(sect->limit() - 1), "sanity"); |
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951 } |
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952 guarantee(sect->end() <= tend, "sanity"); |
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953 guarantee(sect->end() <= sect->limit(), "sanity"); |
| 0 | 954 } |
| 955 } | |
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956 |
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957 void CodeBuffer::log_section_sizes(const char* name) { |
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958 if (xtty != NULL) { |
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959 // log info about buffer usage |
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960 xtty->print_cr("<blob name='%s' size='%d'>", name, _total_size); |
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961 for (int n = (int) CodeBuffer::SECT_FIRST; n < (int) CodeBuffer::SECT_LIMIT; n++) { |
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962 CodeSection* sect = code_section(n); |
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963 if (!sect->is_allocated() || sect->is_empty()) continue; |
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964 xtty->print_cr("<sect index='%d' size='" SIZE_FORMAT "' free='" SIZE_FORMAT "'/>", |
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965 n, sect->limit() - sect->start(), sect->limit() - sect->end()); |
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966 } |
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967 xtty->print_cr("</blob>"); |
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968 } |
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969 } |
| 0 | 970 |
| 971 #ifndef PRODUCT | |
| 972 | |
| 973 void CodeSection::dump() { | |
| 974 address ptr = start(); | |
| 975 for (csize_t step; ptr < end(); ptr += step) { | |
| 976 step = end() - ptr; | |
| 977 if (step > jintSize * 4) step = jintSize * 4; | |
| 978 tty->print(PTR_FORMAT ": ", ptr); | |
| 979 while (step > 0) { | |
| 980 tty->print(" " PTR32_FORMAT, *(jint*)ptr); | |
| 981 ptr += jintSize; | |
| 982 } | |
| 983 tty->cr(); | |
| 984 } | |
| 985 } | |
| 986 | |
| 987 | |
| 988 void CodeSection::decode() { | |
| 989 Disassembler::decode(start(), end()); | |
| 990 } | |
| 991 | |
| 992 | |
| 993 void CodeBuffer::block_comment(intptr_t offset, const char * comment) { | |
| 994 _comments.add_comment(offset, comment); | |
| 995 } | |
| 996 | |
| 6197 | 997 class CodeComment: public CHeapObj<mtCode> { |
| 0 | 998 private: |
| 999 friend class CodeComments; | |
| 1000 intptr_t _offset; | |
| 1001 const char * _comment; | |
| 1002 CodeComment* _next; | |
| 1003 | |
| 1004 ~CodeComment() { | |
| 1005 assert(_next == NULL, "wrong interface for freeing list"); | |
| 6197 | 1006 os::free((void*)_comment, mtCode); |
| 0 | 1007 } |
| 1008 | |
| 1009 public: | |
| 1010 CodeComment(intptr_t offset, const char * comment) { | |
| 1011 _offset = offset; | |
| 6197 | 1012 _comment = os::strdup(comment, mtCode); |
| 0 | 1013 _next = NULL; |
| 1014 } | |
| 1015 | |
| 1016 intptr_t offset() const { return _offset; } | |
| 1017 const char * comment() const { return _comment; } | |
| 1018 CodeComment* next() { return _next; } | |
| 1019 | |
| 1020 void set_next(CodeComment* next) { _next = next; } | |
| 1021 | |
| 1022 CodeComment* find(intptr_t offset) { | |
| 1023 CodeComment* a = this; | |
| 1024 while (a != NULL && a->_offset != offset) { | |
| 1025 a = a->_next; | |
| 1026 } | |
| 1027 return a; | |
| 1028 } | |
| 1029 }; | |
| 1030 | |
| 1031 | |
| 1032 void CodeComments::add_comment(intptr_t offset, const char * comment) { | |
| 1033 CodeComment* c = new CodeComment(offset, comment); | |
| 1034 CodeComment* insert = NULL; | |
| 1035 if (_comments != NULL) { | |
| 1036 CodeComment* c = _comments->find(offset); | |
| 1037 insert = c; | |
| 1038 while (c && c->offset() == offset) { | |
| 1039 insert = c; | |
| 1040 c = c->next(); | |
| 1041 } | |
| 1042 } | |
| 1043 if (insert) { | |
| 1044 // insert after comments with same offset | |
| 1045 c->set_next(insert->next()); | |
| 1046 insert->set_next(c); | |
| 1047 } else { | |
| 1048 c->set_next(_comments); | |
| 1049 _comments = c; | |
| 1050 } | |
| 1051 } | |
| 1052 | |
| 1053 | |
| 1054 void CodeComments::assign(CodeComments& other) { | |
| 1055 assert(_comments == NULL, "don't overwrite old value"); | |
| 1056 _comments = other._comments; | |
| 1057 } | |
| 1058 | |
| 1059 | |
| 1060 void CodeComments::print_block_comment(outputStream* stream, intptr_t offset) { | |
| 1061 if (_comments != NULL) { | |
| 1062 CodeComment* c = _comments->find(offset); | |
| 1063 while (c && c->offset() == offset) { | |
|
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1064 stream->bol(); |
| 0 | 1065 stream->print(" ;; "); |
| 1066 stream->print_cr(c->comment()); | |
| 1067 c = c->next(); | |
| 1068 } | |
| 1069 } | |
| 1070 } | |
| 1071 | |
| 1072 | |
| 1073 void CodeComments::free() { | |
| 1074 CodeComment* n = _comments; | |
| 1075 while (n) { | |
| 1076 // unlink the node from the list saving a pointer to the next | |
| 1077 CodeComment* p = n->_next; | |
| 1078 n->_next = NULL; | |
| 1079 delete n; | |
| 1080 n = p; | |
| 1081 } | |
| 1082 _comments = NULL; | |
| 1083 } | |
| 1084 | |
| 1085 | |
| 1086 | |
| 1087 void CodeBuffer::decode() { | |
| 1748 | 1088 Disassembler::decode(decode_begin(), insts_end()); |
| 1089 _decode_begin = insts_end(); | |
| 0 | 1090 } |
| 1091 | |
| 1092 | |
| 1093 void CodeBuffer::skip_decode() { | |
| 1748 | 1094 _decode_begin = insts_end(); |
| 0 | 1095 } |
| 1096 | |
| 1097 | |
| 1098 void CodeBuffer::decode_all() { | |
| 1099 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 1100 // dump contents of each section | |
| 1101 CodeSection* cs = code_section(n); | |
| 1102 tty->print_cr("! %s:", code_section_name(n)); | |
| 1103 if (cs != consts()) | |
| 1104 cs->decode(); | |
| 1105 else | |
| 1106 cs->dump(); | |
| 1107 } | |
| 1108 } | |
| 1109 | |
| 1110 | |
| 1111 void CodeSection::print(const char* name) { | |
| 1112 csize_t locs_size = locs_end() - locs_start(); | |
| 1113 tty->print_cr(" %7s.code = " PTR_FORMAT " : " PTR_FORMAT " : " PTR_FORMAT " (%d of %d)%s", | |
| 1114 name, start(), end(), limit(), size(), capacity(), | |
| 1115 is_frozen()? " [frozen]": ""); | |
| 1116 tty->print_cr(" %7s.locs = " PTR_FORMAT " : " PTR_FORMAT " : " PTR_FORMAT " (%d of %d) point=%d", | |
| 1117 name, locs_start(), locs_end(), locs_limit(), locs_size, locs_capacity(), locs_point_off()); | |
| 1118 if (PrintRelocations) { | |
| 1119 RelocIterator iter(this); | |
| 1120 iter.print(); | |
| 1121 } | |
| 1122 } | |
| 1123 | |
| 1124 void CodeBuffer::print() { | |
| 1125 if (this == NULL) { | |
| 1126 tty->print_cr("NULL CodeBuffer pointer"); | |
| 1127 return; | |
| 1128 } | |
| 1129 | |
| 1130 tty->print_cr("CodeBuffer:"); | |
| 1131 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
| 1132 // print each section | |
| 1133 CodeSection* cs = code_section(n); | |
| 1134 cs->print(code_section_name(n)); | |
| 1135 } | |
| 1136 } | |
| 1137 | |
| 1138 #endif // PRODUCT |