Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifdef ENABLE_GDB_JIT_INTERFACE |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 29 | #include "v8.h" |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 30 | #include "gdb-jit.h" |
| 31 | |
| 32 | #include "bootstrapper.h" |
| 33 | #include "compiler.h" |
| 34 | #include "global-handles.h" |
| 35 | #include "messages.h" |
| 36 | #include "natives.h" |
| 37 | |
| 38 | namespace v8 { |
| 39 | namespace internal { |
| 40 | |
| 41 | class ELF; |
| 42 | |
| 43 | class Writer BASE_EMBEDDED { |
| 44 | public: |
| 45 | explicit Writer(ELF* elf) |
| 46 | : elf_(elf), |
| 47 | position_(0), |
| 48 | capacity_(1024), |
| 49 | buffer_(reinterpret_cast<byte*>(malloc(capacity_))) { |
| 50 | } |
| 51 | |
| 52 | ~Writer() { |
| 53 | free(buffer_); |
| 54 | } |
| 55 | |
| 56 | uintptr_t position() const { |
| 57 | return position_; |
| 58 | } |
| 59 | |
| 60 | template<typename T> |
| 61 | class Slot { |
| 62 | public: |
| 63 | Slot(Writer* w, uintptr_t offset) : w_(w), offset_(offset) { } |
| 64 | |
| 65 | T* operator-> () { |
| 66 | return w_->RawSlotAt<T>(offset_); |
| 67 | } |
| 68 | |
| 69 | void set(const T& value) { |
| 70 | *w_->RawSlotAt<T>(offset_) = value; |
| 71 | } |
| 72 | |
| 73 | Slot<T> at(int i) { |
| 74 | return Slot<T>(w_, offset_ + sizeof(T) * i); |
| 75 | } |
| 76 | |
| 77 | private: |
| 78 | Writer* w_; |
| 79 | uintptr_t offset_; |
| 80 | }; |
| 81 | |
| 82 | template<typename T> |
| 83 | void Write(const T& val) { |
| 84 | Ensure(position_ + sizeof(T)); |
| 85 | *RawSlotAt<T>(position_) = val; |
| 86 | position_ += sizeof(T); |
| 87 | } |
| 88 | |
| 89 | template<typename T> |
| 90 | Slot<T> SlotAt(uintptr_t offset) { |
| 91 | Ensure(offset + sizeof(T)); |
| 92 | return Slot<T>(this, offset); |
| 93 | } |
| 94 | |
| 95 | template<typename T> |
| 96 | Slot<T> CreateSlotHere() { |
| 97 | return CreateSlotsHere<T>(1); |
| 98 | } |
| 99 | |
| 100 | template<typename T> |
| 101 | Slot<T> CreateSlotsHere(uint32_t count) { |
| 102 | uintptr_t slot_position = position_; |
| 103 | position_ += sizeof(T) * count; |
| 104 | Ensure(position_); |
| 105 | return SlotAt<T>(slot_position); |
| 106 | } |
| 107 | |
| 108 | void Ensure(uintptr_t pos) { |
| 109 | if (capacity_ < pos) { |
| 110 | while (capacity_ < pos) capacity_ *= 2; |
| 111 | buffer_ = reinterpret_cast<byte*>(realloc(buffer_, capacity_)); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | ELF* elf() { return elf_; } |
| 116 | |
| 117 | byte* buffer() { return buffer_; } |
| 118 | |
| 119 | void Align(uintptr_t align) { |
| 120 | uintptr_t delta = position_ % align; |
| 121 | if (delta == 0) return; |
| 122 | uintptr_t padding = align - delta; |
| 123 | Ensure(position_ += padding); |
| 124 | ASSERT((position_ % align) == 0); |
| 125 | } |
| 126 | |
| 127 | void WriteULEB128(uintptr_t value) { |
| 128 | do { |
| 129 | uint8_t byte = value & 0x7F; |
| 130 | value >>= 7; |
| 131 | if (value != 0) byte |= 0x80; |
| 132 | Write<uint8_t>(byte); |
| 133 | } while (value != 0); |
| 134 | } |
| 135 | |
| 136 | void WriteSLEB128(intptr_t value) { |
| 137 | bool more = true; |
| 138 | while (more) { |
| 139 | int8_t byte = value & 0x7F; |
| 140 | bool byte_sign = byte & 0x40; |
| 141 | value >>= 7; |
| 142 | |
| 143 | if ((value == 0 && !byte_sign) || (value == -1 && byte_sign)) { |
| 144 | more = false; |
| 145 | } else { |
| 146 | byte |= 0x80; |
| 147 | } |
| 148 | |
| 149 | Write<int8_t>(byte); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | void WriteString(const char* str) { |
| 154 | do { |
| 155 | Write<char>(*str); |
| 156 | } while (*str++); |
| 157 | } |
| 158 | |
| 159 | private: |
| 160 | template<typename T> friend class Slot; |
| 161 | |
| 162 | template<typename T> |
| 163 | T* RawSlotAt(uintptr_t offset) { |
| 164 | ASSERT(offset < capacity_ && offset + sizeof(T) <= capacity_); |
| 165 | return reinterpret_cast<T*>(&buffer_[offset]); |
| 166 | } |
| 167 | |
| 168 | ELF* elf_; |
| 169 | uintptr_t position_; |
| 170 | uintptr_t capacity_; |
| 171 | byte* buffer_; |
| 172 | }; |
| 173 | |
| 174 | class StringTable; |
| 175 | |
| 176 | class ELFSection : public ZoneObject { |
| 177 | public: |
| 178 | struct Header { |
| 179 | uint32_t name; |
| 180 | uint32_t type; |
| 181 | uintptr_t flags; |
| 182 | uintptr_t address; |
| 183 | uintptr_t offset; |
| 184 | uintptr_t size; |
| 185 | uint32_t link; |
| 186 | uint32_t info; |
| 187 | uintptr_t alignment; |
| 188 | uintptr_t entry_size; |
| 189 | }; |
| 190 | |
| 191 | enum Type { |
| 192 | TYPE_NULL = 0, |
| 193 | TYPE_PROGBITS = 1, |
| 194 | TYPE_SYMTAB = 2, |
| 195 | TYPE_STRTAB = 3, |
| 196 | TYPE_RELA = 4, |
| 197 | TYPE_HASH = 5, |
| 198 | TYPE_DYNAMIC = 6, |
| 199 | TYPE_NOTE = 7, |
| 200 | TYPE_NOBITS = 8, |
| 201 | TYPE_REL = 9, |
| 202 | TYPE_SHLIB = 10, |
| 203 | TYPE_DYNSYM = 11, |
| 204 | TYPE_LOPROC = 0x70000000, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 205 | TYPE_X86_64_UNWIND = 0x70000001, |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 206 | TYPE_HIPROC = 0x7fffffff, |
| 207 | TYPE_LOUSER = 0x80000000, |
| 208 | TYPE_HIUSER = 0xffffffff |
| 209 | }; |
| 210 | |
| 211 | enum Flags { |
| 212 | FLAG_WRITE = 1, |
| 213 | FLAG_ALLOC = 2, |
| 214 | FLAG_EXEC = 4 |
| 215 | }; |
| 216 | |
| 217 | enum SpecialIndexes { |
| 218 | INDEX_ABSOLUTE = 0xfff1 |
| 219 | }; |
| 220 | |
| 221 | ELFSection(const char* name, Type type, uintptr_t align) |
| 222 | : name_(name), type_(type), align_(align) { } |
| 223 | |
| 224 | virtual ~ELFSection() { } |
| 225 | |
| 226 | void PopulateHeader(Writer::Slot<Header> header, StringTable* strtab); |
| 227 | |
| 228 | virtual void WriteBody(Writer::Slot<Header> header, Writer* w) { |
| 229 | uintptr_t start = w->position(); |
| 230 | if (WriteBody(w)) { |
| 231 | uintptr_t end = w->position(); |
| 232 | header->offset = start; |
| 233 | header->size = end - start; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | virtual bool WriteBody(Writer* w) { |
| 238 | return false; |
| 239 | } |
| 240 | |
| 241 | uint16_t index() const { return index_; } |
| 242 | void set_index(uint16_t index) { index_ = index; } |
| 243 | |
| 244 | protected: |
| 245 | virtual void PopulateHeader(Writer::Slot<Header> header) { |
| 246 | header->flags = 0; |
| 247 | header->address = 0; |
| 248 | header->offset = 0; |
| 249 | header->size = 0; |
| 250 | header->link = 0; |
| 251 | header->info = 0; |
| 252 | header->entry_size = 0; |
| 253 | } |
| 254 | |
| 255 | |
| 256 | private: |
| 257 | const char* name_; |
| 258 | Type type_; |
| 259 | uintptr_t align_; |
| 260 | uint16_t index_; |
| 261 | }; |
| 262 | |
| 263 | |
| 264 | class FullHeaderELFSection : public ELFSection { |
| 265 | public: |
| 266 | FullHeaderELFSection(const char* name, |
| 267 | Type type, |
| 268 | uintptr_t align, |
| 269 | uintptr_t addr, |
| 270 | uintptr_t offset, |
| 271 | uintptr_t size, |
| 272 | uintptr_t flags) |
| 273 | : ELFSection(name, type, align), |
| 274 | addr_(addr), |
| 275 | offset_(offset), |
| 276 | size_(size), |
| 277 | flags_(flags) { } |
| 278 | |
| 279 | protected: |
| 280 | virtual void PopulateHeader(Writer::Slot<Header> header) { |
| 281 | ELFSection::PopulateHeader(header); |
| 282 | header->address = addr_; |
| 283 | header->offset = offset_; |
| 284 | header->size = size_; |
| 285 | header->flags = flags_; |
| 286 | } |
| 287 | |
| 288 | private: |
| 289 | uintptr_t addr_; |
| 290 | uintptr_t offset_; |
| 291 | uintptr_t size_; |
| 292 | uintptr_t flags_; |
| 293 | }; |
| 294 | |
| 295 | |
| 296 | class StringTable : public ELFSection { |
| 297 | public: |
| 298 | explicit StringTable(const char* name) |
| 299 | : ELFSection(name, TYPE_STRTAB, 1), writer_(NULL), offset_(0), size_(0) { |
| 300 | } |
| 301 | |
| 302 | uintptr_t Add(const char* str) { |
| 303 | if (*str == '\0') return 0; |
| 304 | |
| 305 | uintptr_t offset = size_; |
| 306 | WriteString(str); |
| 307 | return offset; |
| 308 | } |
| 309 | |
| 310 | void AttachWriter(Writer* w) { |
| 311 | writer_ = w; |
| 312 | offset_ = writer_->position(); |
| 313 | |
| 314 | // First entry in the string table should be an empty string. |
| 315 | WriteString(""); |
| 316 | } |
| 317 | |
| 318 | void DetachWriter() { |
| 319 | writer_ = NULL; |
| 320 | } |
| 321 | |
| 322 | virtual void WriteBody(Writer::Slot<Header> header, Writer* w) { |
| 323 | ASSERT(writer_ == NULL); |
| 324 | header->offset = offset_; |
| 325 | header->size = size_; |
| 326 | } |
| 327 | |
| 328 | private: |
| 329 | void WriteString(const char* str) { |
| 330 | uintptr_t written = 0; |
| 331 | do { |
| 332 | writer_->Write(*str); |
| 333 | written++; |
| 334 | } while (*str++); |
| 335 | size_ += written; |
| 336 | } |
| 337 | |
| 338 | Writer* writer_; |
| 339 | |
| 340 | uintptr_t offset_; |
| 341 | uintptr_t size_; |
| 342 | }; |
| 343 | |
| 344 | |
| 345 | void ELFSection::PopulateHeader(Writer::Slot<ELFSection::Header> header, |
| 346 | StringTable* strtab) { |
| 347 | header->name = strtab->Add(name_); |
| 348 | header->type = type_; |
| 349 | header->alignment = align_; |
| 350 | PopulateHeader(header); |
| 351 | } |
| 352 | |
| 353 | |
| 354 | class ELF BASE_EMBEDDED { |
| 355 | public: |
| 356 | ELF() : sections_(6) { |
| 357 | sections_.Add(new ELFSection("", ELFSection::TYPE_NULL, 0)); |
| 358 | sections_.Add(new StringTable(".shstrtab")); |
| 359 | } |
| 360 | |
| 361 | void Write(Writer* w) { |
| 362 | WriteHeader(w); |
| 363 | WriteSectionTable(w); |
| 364 | WriteSections(w); |
| 365 | } |
| 366 | |
| 367 | ELFSection* SectionAt(uint32_t index) { |
| 368 | return sections_[index]; |
| 369 | } |
| 370 | |
| 371 | uint32_t AddSection(ELFSection* section) { |
| 372 | sections_.Add(section); |
| 373 | section->set_index(sections_.length() - 1); |
| 374 | return sections_.length() - 1; |
| 375 | } |
| 376 | |
| 377 | private: |
| 378 | struct ELFHeader { |
| 379 | uint8_t ident[16]; |
| 380 | uint16_t type; |
| 381 | uint16_t machine; |
| 382 | uint32_t version; |
| 383 | uintptr_t entry; |
| 384 | uintptr_t pht_offset; |
| 385 | uintptr_t sht_offset; |
| 386 | uint32_t flags; |
| 387 | uint16_t header_size; |
| 388 | uint16_t pht_entry_size; |
| 389 | uint16_t pht_entry_num; |
| 390 | uint16_t sht_entry_size; |
| 391 | uint16_t sht_entry_num; |
| 392 | uint16_t sht_strtab_index; |
| 393 | }; |
| 394 | |
| 395 | |
| 396 | void WriteHeader(Writer* w) { |
| 397 | ASSERT(w->position() == 0); |
| 398 | Writer::Slot<ELFHeader> header = w->CreateSlotHere<ELFHeader>(); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 399 | #if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_ARM) |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 400 | const uint8_t ident[16] = |
| 401 | { 0x7f, 'E', 'L', 'F', 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}; |
| 402 | #elif defined(V8_TARGET_ARCH_X64) |
| 403 | const uint8_t ident[16] = |
| 404 | { 0x7f, 'E', 'L', 'F', 2, 1, 1, 0, 0, 0 , 0, 0, 0, 0, 0, 0}; |
| 405 | #else |
| 406 | #error Unsupported target architecture. |
| 407 | #endif |
| 408 | memcpy(header->ident, ident, 16); |
| 409 | header->type = 1; |
| 410 | #if defined(V8_TARGET_ARCH_IA32) |
| 411 | header->machine = 3; |
| 412 | #elif defined(V8_TARGET_ARCH_X64) |
| 413 | // Processor identification value for x64 is 62 as defined in |
| 414 | // System V ABI, AMD64 Supplement |
| 415 | // http://www.x86-64.org/documentation/abi.pdf |
| 416 | header->machine = 62; |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 417 | #elif defined(V8_TARGET_ARCH_ARM) |
| 418 | // Set to EM_ARM, defined as 40, in "ARM ELF File Format" at |
| 419 | // infocenter.arm.com/help/topic/com.arm.doc.dui0101a/DUI0101A_Elf.pdf |
| 420 | header->machine = 40; |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 421 | #else |
| 422 | #error Unsupported target architecture. |
| 423 | #endif |
| 424 | header->version = 1; |
| 425 | header->entry = 0; |
| 426 | header->pht_offset = 0; |
| 427 | header->sht_offset = sizeof(ELFHeader); // Section table follows header. |
| 428 | header->flags = 0; |
| 429 | header->header_size = sizeof(ELFHeader); |
| 430 | header->pht_entry_size = 0; |
| 431 | header->pht_entry_num = 0; |
| 432 | header->sht_entry_size = sizeof(ELFSection::Header); |
| 433 | header->sht_entry_num = sections_.length(); |
| 434 | header->sht_strtab_index = 1; |
| 435 | } |
| 436 | |
| 437 | void WriteSectionTable(Writer* w) { |
| 438 | // Section headers table immediately follows file header. |
| 439 | ASSERT(w->position() == sizeof(ELFHeader)); |
| 440 | |
| 441 | Writer::Slot<ELFSection::Header> headers = |
| 442 | w->CreateSlotsHere<ELFSection::Header>(sections_.length()); |
| 443 | |
| 444 | // String table for section table is the first section. |
| 445 | StringTable* strtab = static_cast<StringTable*>(SectionAt(1)); |
| 446 | strtab->AttachWriter(w); |
| 447 | for (int i = 0, length = sections_.length(); |
| 448 | i < length; |
| 449 | i++) { |
| 450 | sections_[i]->PopulateHeader(headers.at(i), strtab); |
| 451 | } |
| 452 | strtab->DetachWriter(); |
| 453 | } |
| 454 | |
| 455 | int SectionHeaderPosition(uint32_t section_index) { |
| 456 | return sizeof(ELFHeader) + sizeof(ELFSection::Header) * section_index; |
| 457 | } |
| 458 | |
| 459 | void WriteSections(Writer* w) { |
| 460 | Writer::Slot<ELFSection::Header> headers = |
| 461 | w->SlotAt<ELFSection::Header>(sizeof(ELFHeader)); |
| 462 | |
| 463 | for (int i = 0, length = sections_.length(); |
| 464 | i < length; |
| 465 | i++) { |
| 466 | sections_[i]->WriteBody(headers.at(i), w); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | ZoneList<ELFSection*> sections_; |
| 471 | }; |
| 472 | |
| 473 | |
| 474 | class ELFSymbol BASE_EMBEDDED { |
| 475 | public: |
| 476 | enum Type { |
| 477 | TYPE_NOTYPE = 0, |
| 478 | TYPE_OBJECT = 1, |
| 479 | TYPE_FUNC = 2, |
| 480 | TYPE_SECTION = 3, |
| 481 | TYPE_FILE = 4, |
| 482 | TYPE_LOPROC = 13, |
| 483 | TYPE_HIPROC = 15 |
| 484 | }; |
| 485 | |
| 486 | enum Binding { |
| 487 | BIND_LOCAL = 0, |
| 488 | BIND_GLOBAL = 1, |
| 489 | BIND_WEAK = 2, |
| 490 | BIND_LOPROC = 13, |
| 491 | BIND_HIPROC = 15 |
| 492 | }; |
| 493 | |
| 494 | ELFSymbol(const char* name, |
| 495 | uintptr_t value, |
| 496 | uintptr_t size, |
| 497 | Binding binding, |
| 498 | Type type, |
| 499 | uint16_t section) |
| 500 | : name(name), |
| 501 | value(value), |
| 502 | size(size), |
| 503 | info((binding << 4) | type), |
| 504 | other(0), |
| 505 | section(section) { |
| 506 | } |
| 507 | |
| 508 | Binding binding() const { |
| 509 | return static_cast<Binding>(info >> 4); |
| 510 | } |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 511 | #if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_ARM) |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 512 | struct SerializedLayout { |
| 513 | SerializedLayout(uint32_t name, |
| 514 | uintptr_t value, |
| 515 | uintptr_t size, |
| 516 | Binding binding, |
| 517 | Type type, |
| 518 | uint16_t section) |
| 519 | : name(name), |
| 520 | value(value), |
| 521 | size(size), |
| 522 | info((binding << 4) | type), |
| 523 | other(0), |
| 524 | section(section) { |
| 525 | } |
| 526 | |
| 527 | uint32_t name; |
| 528 | uintptr_t value; |
| 529 | uintptr_t size; |
| 530 | uint8_t info; |
| 531 | uint8_t other; |
| 532 | uint16_t section; |
| 533 | }; |
| 534 | #elif defined(V8_TARGET_ARCH_X64) |
| 535 | struct SerializedLayout { |
| 536 | SerializedLayout(uint32_t name, |
| 537 | uintptr_t value, |
| 538 | uintptr_t size, |
| 539 | Binding binding, |
| 540 | Type type, |
| 541 | uint16_t section) |
| 542 | : name(name), |
| 543 | info((binding << 4) | type), |
| 544 | other(0), |
| 545 | section(section), |
| 546 | value(value), |
| 547 | size(size) { |
| 548 | } |
| 549 | |
| 550 | uint32_t name; |
| 551 | uint8_t info; |
| 552 | uint8_t other; |
| 553 | uint16_t section; |
| 554 | uintptr_t value; |
| 555 | uintptr_t size; |
| 556 | }; |
| 557 | #endif |
| 558 | |
| 559 | void Write(Writer::Slot<SerializedLayout> s, StringTable* t) { |
| 560 | // Convert symbol names from strings to indexes in the string table. |
| 561 | s->name = t->Add(name); |
| 562 | s->value = value; |
| 563 | s->size = size; |
| 564 | s->info = info; |
| 565 | s->other = other; |
| 566 | s->section = section; |
| 567 | } |
| 568 | |
| 569 | private: |
| 570 | const char* name; |
| 571 | uintptr_t value; |
| 572 | uintptr_t size; |
| 573 | uint8_t info; |
| 574 | uint8_t other; |
| 575 | uint16_t section; |
| 576 | }; |
| 577 | |
| 578 | |
| 579 | class ELFSymbolTable : public ELFSection { |
| 580 | public: |
| 581 | explicit ELFSymbolTable(const char* name) |
| 582 | : ELFSection(name, TYPE_SYMTAB, sizeof(uintptr_t)), |
| 583 | locals_(1), |
| 584 | globals_(1) { |
| 585 | } |
| 586 | |
| 587 | virtual void WriteBody(Writer::Slot<Header> header, Writer* w) { |
| 588 | w->Align(header->alignment); |
| 589 | int total_symbols = locals_.length() + globals_.length() + 1; |
| 590 | header->offset = w->position(); |
| 591 | |
| 592 | Writer::Slot<ELFSymbol::SerializedLayout> symbols = |
| 593 | w->CreateSlotsHere<ELFSymbol::SerializedLayout>(total_symbols); |
| 594 | |
| 595 | header->size = w->position() - header->offset; |
| 596 | |
| 597 | // String table for this symbol table should follow it in the section table. |
| 598 | StringTable* strtab = |
| 599 | static_cast<StringTable*>(w->elf()->SectionAt(index() + 1)); |
| 600 | strtab->AttachWriter(w); |
| 601 | symbols.at(0).set(ELFSymbol::SerializedLayout(0, |
| 602 | 0, |
| 603 | 0, |
| 604 | ELFSymbol::BIND_LOCAL, |
| 605 | ELFSymbol::TYPE_NOTYPE, |
| 606 | 0)); |
| 607 | WriteSymbolsList(&locals_, symbols.at(1), strtab); |
| 608 | WriteSymbolsList(&globals_, symbols.at(locals_.length() + 1), strtab); |
| 609 | strtab->DetachWriter(); |
| 610 | } |
| 611 | |
| 612 | void Add(const ELFSymbol& symbol) { |
| 613 | if (symbol.binding() == ELFSymbol::BIND_LOCAL) { |
| 614 | locals_.Add(symbol); |
| 615 | } else { |
| 616 | globals_.Add(symbol); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | protected: |
| 621 | virtual void PopulateHeader(Writer::Slot<Header> header) { |
| 622 | ELFSection::PopulateHeader(header); |
| 623 | // We are assuming that string table will follow symbol table. |
| 624 | header->link = index() + 1; |
| 625 | header->info = locals_.length() + 1; |
| 626 | header->entry_size = sizeof(ELFSymbol::SerializedLayout); |
| 627 | } |
| 628 | |
| 629 | private: |
| 630 | void WriteSymbolsList(const ZoneList<ELFSymbol>* src, |
| 631 | Writer::Slot<ELFSymbol::SerializedLayout> dst, |
| 632 | StringTable* strtab) { |
| 633 | for (int i = 0, len = src->length(); |
| 634 | i < len; |
| 635 | i++) { |
| 636 | src->at(i).Write(dst.at(i), strtab); |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | ZoneList<ELFSymbol> locals_; |
| 641 | ZoneList<ELFSymbol> globals_; |
| 642 | }; |
| 643 | |
| 644 | |
| 645 | class CodeDescription BASE_EMBEDDED { |
| 646 | public: |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 647 | |
| 648 | #ifdef V8_TARGET_ARCH_X64 |
| 649 | enum StackState { |
| 650 | POST_RBP_PUSH, |
| 651 | POST_RBP_SET, |
| 652 | POST_RBP_POP, |
| 653 | STACK_STATE_MAX |
| 654 | }; |
| 655 | #endif |
| 656 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 657 | CodeDescription(const char* name, |
| 658 | Code* code, |
| 659 | Handle<Script> script, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 660 | GDBJITLineInfo* lineinfo, |
| 661 | GDBJITInterface::CodeTag tag) |
| 662 | : name_(name), |
| 663 | code_(code), |
| 664 | script_(script), |
| 665 | lineinfo_(lineinfo), |
| 666 | tag_(tag) { |
| 667 | } |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 668 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 669 | const char* name() const { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 670 | return name_; |
| 671 | } |
| 672 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 673 | GDBJITLineInfo* lineinfo() const { |
| 674 | return lineinfo_; |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 675 | } |
| 676 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 677 | GDBJITInterface::CodeTag tag() const { |
| 678 | return tag_; |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 679 | } |
| 680 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 681 | uintptr_t CodeStart() const { |
| 682 | return reinterpret_cast<uintptr_t>(code_->instruction_start()); |
| 683 | } |
| 684 | |
| 685 | uintptr_t CodeEnd() const { |
| 686 | return reinterpret_cast<uintptr_t>(code_->instruction_end()); |
| 687 | } |
| 688 | |
| 689 | uintptr_t CodeSize() const { |
| 690 | return CodeEnd() - CodeStart(); |
| 691 | } |
| 692 | |
| 693 | bool IsLineInfoAvailable() { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 694 | return !script_.is_null() && |
| 695 | script_->source()->IsString() && |
| 696 | script_->HasValidSource() && |
| 697 | script_->name()->IsString() && |
| 698 | lineinfo_ != NULL; |
| 699 | } |
| 700 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 701 | #ifdef V8_TARGET_ARCH_X64 |
| 702 | uintptr_t GetStackStateStartAddress(StackState state) const { |
| 703 | ASSERT(state < STACK_STATE_MAX); |
| 704 | return stack_state_start_addresses_[state]; |
| 705 | } |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 706 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 707 | void SetStackStateStartAddress(StackState state, uintptr_t addr) { |
| 708 | ASSERT(state < STACK_STATE_MAX); |
| 709 | stack_state_start_addresses_[state] = addr; |
| 710 | } |
| 711 | #endif |
| 712 | |
| 713 | SmartPointer<char> GetFilename() { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 714 | return String::cast(script_->name())->ToCString(); |
| 715 | } |
| 716 | |
| 717 | int GetScriptLineNumber(int pos) { |
| 718 | return GetScriptLineNumberSafe(script_, pos) + 1; |
| 719 | } |
| 720 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 721 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 722 | private: |
| 723 | const char* name_; |
| 724 | Code* code_; |
| 725 | Handle<Script> script_; |
| 726 | GDBJITLineInfo* lineinfo_; |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 727 | GDBJITInterface::CodeTag tag_; |
| 728 | #ifdef V8_TARGET_ARCH_X64 |
| 729 | uintptr_t stack_state_start_addresses_[STACK_STATE_MAX]; |
| 730 | #endif |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 731 | }; |
| 732 | |
| 733 | |
| 734 | static void CreateSymbolsTable(CodeDescription* desc, |
| 735 | ELF* elf, |
| 736 | int text_section_index) { |
| 737 | ELFSymbolTable* symtab = new ELFSymbolTable(".symtab"); |
| 738 | StringTable* strtab = new StringTable(".strtab"); |
| 739 | |
| 740 | // Symbol table should be followed by the linked string table. |
| 741 | elf->AddSection(symtab); |
| 742 | elf->AddSection(strtab); |
| 743 | |
| 744 | symtab->Add(ELFSymbol("V8 Code", |
| 745 | 0, |
| 746 | 0, |
| 747 | ELFSymbol::BIND_LOCAL, |
| 748 | ELFSymbol::TYPE_FILE, |
| 749 | ELFSection::INDEX_ABSOLUTE)); |
| 750 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 751 | symtab->Add(ELFSymbol(desc->name(), |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 752 | 0, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 753 | desc->CodeSize(), |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 754 | ELFSymbol::BIND_GLOBAL, |
| 755 | ELFSymbol::TYPE_FUNC, |
| 756 | text_section_index)); |
| 757 | } |
| 758 | |
| 759 | |
| 760 | class DebugInfoSection : public ELFSection { |
| 761 | public: |
| 762 | explicit DebugInfoSection(CodeDescription* desc) |
| 763 | : ELFSection(".debug_info", TYPE_PROGBITS, 1), desc_(desc) { } |
| 764 | |
| 765 | bool WriteBody(Writer* w) { |
| 766 | Writer::Slot<uint32_t> size = w->CreateSlotHere<uint32_t>(); |
| 767 | uintptr_t start = w->position(); |
| 768 | w->Write<uint16_t>(2); // DWARF version. |
| 769 | w->Write<uint32_t>(0); // Abbreviation table offset. |
| 770 | w->Write<uint8_t>(sizeof(intptr_t)); |
| 771 | |
| 772 | w->WriteULEB128(1); // Abbreviation code. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 773 | w->WriteString(*desc_->GetFilename()); |
| 774 | w->Write<intptr_t>(desc_->CodeStart()); |
| 775 | w->Write<intptr_t>(desc_->CodeStart() + desc_->CodeSize()); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 776 | w->Write<uint32_t>(0); |
| 777 | size.set(static_cast<uint32_t>(w->position() - start)); |
| 778 | return true; |
| 779 | } |
| 780 | |
| 781 | private: |
| 782 | CodeDescription* desc_; |
| 783 | }; |
| 784 | |
| 785 | |
| 786 | class DebugAbbrevSection : public ELFSection { |
| 787 | public: |
| 788 | DebugAbbrevSection() : ELFSection(".debug_abbrev", TYPE_PROGBITS, 1) { } |
| 789 | |
| 790 | // DWARF2 standard, figure 14. |
| 791 | enum DWARF2Tags { |
| 792 | DW_TAG_COMPILE_UNIT = 0x11 |
| 793 | }; |
| 794 | |
| 795 | // DWARF2 standard, figure 16. |
| 796 | enum DWARF2ChildrenDetermination { |
| 797 | DW_CHILDREN_NO = 0, |
| 798 | DW_CHILDREN_YES = 1 |
| 799 | }; |
| 800 | |
| 801 | // DWARF standard, figure 17. |
| 802 | enum DWARF2Attribute { |
| 803 | DW_AT_NAME = 0x3, |
| 804 | DW_AT_STMT_LIST = 0x10, |
| 805 | DW_AT_LOW_PC = 0x11, |
| 806 | DW_AT_HIGH_PC = 0x12 |
| 807 | }; |
| 808 | |
| 809 | // DWARF2 standard, figure 19. |
| 810 | enum DWARF2AttributeForm { |
| 811 | DW_FORM_ADDR = 0x1, |
| 812 | DW_FORM_STRING = 0x8, |
| 813 | DW_FORM_DATA4 = 0x6 |
| 814 | }; |
| 815 | |
| 816 | bool WriteBody(Writer* w) { |
| 817 | w->WriteULEB128(1); |
| 818 | w->WriteULEB128(DW_TAG_COMPILE_UNIT); |
| 819 | w->Write<uint8_t>(DW_CHILDREN_NO); |
| 820 | w->WriteULEB128(DW_AT_NAME); |
| 821 | w->WriteULEB128(DW_FORM_STRING); |
| 822 | w->WriteULEB128(DW_AT_LOW_PC); |
| 823 | w->WriteULEB128(DW_FORM_ADDR); |
| 824 | w->WriteULEB128(DW_AT_HIGH_PC); |
| 825 | w->WriteULEB128(DW_FORM_ADDR); |
| 826 | w->WriteULEB128(DW_AT_STMT_LIST); |
| 827 | w->WriteULEB128(DW_FORM_DATA4); |
| 828 | w->WriteULEB128(0); |
| 829 | w->WriteULEB128(0); |
| 830 | w->WriteULEB128(0); |
| 831 | return true; |
| 832 | } |
| 833 | }; |
| 834 | |
| 835 | |
| 836 | class DebugLineSection : public ELFSection { |
| 837 | public: |
| 838 | explicit DebugLineSection(CodeDescription* desc) |
| 839 | : ELFSection(".debug_line", TYPE_PROGBITS, 1), |
| 840 | desc_(desc) { } |
| 841 | |
| 842 | // DWARF2 standard, figure 34. |
| 843 | enum DWARF2Opcodes { |
| 844 | DW_LNS_COPY = 1, |
| 845 | DW_LNS_ADVANCE_PC = 2, |
| 846 | DW_LNS_ADVANCE_LINE = 3, |
| 847 | DW_LNS_SET_FILE = 4, |
| 848 | DW_LNS_SET_COLUMN = 5, |
| 849 | DW_LNS_NEGATE_STMT = 6 |
| 850 | }; |
| 851 | |
| 852 | // DWARF2 standard, figure 35. |
| 853 | enum DWARF2ExtendedOpcode { |
| 854 | DW_LNE_END_SEQUENCE = 1, |
| 855 | DW_LNE_SET_ADDRESS = 2, |
| 856 | DW_LNE_DEFINE_FILE = 3 |
| 857 | }; |
| 858 | |
| 859 | bool WriteBody(Writer* w) { |
| 860 | // Write prologue. |
| 861 | Writer::Slot<uint32_t> total_length = w->CreateSlotHere<uint32_t>(); |
| 862 | uintptr_t start = w->position(); |
| 863 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 864 | // Used for special opcodes |
| 865 | const int8_t line_base = 1; |
| 866 | const uint8_t line_range = 7; |
| 867 | const int8_t max_line_incr = (line_base + line_range - 1); |
| 868 | const uint8_t opcode_base = DW_LNS_NEGATE_STMT + 1; |
| 869 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 870 | w->Write<uint16_t>(2); // Field version. |
| 871 | Writer::Slot<uint32_t> prologue_length = w->CreateSlotHere<uint32_t>(); |
| 872 | uintptr_t prologue_start = w->position(); |
| 873 | w->Write<uint8_t>(1); // Field minimum_instruction_length. |
| 874 | w->Write<uint8_t>(1); // Field default_is_stmt. |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 875 | w->Write<int8_t>(line_base); // Field line_base. |
| 876 | w->Write<uint8_t>(line_range); // Field line_range. |
| 877 | w->Write<uint8_t>(opcode_base); // Field opcode_base. |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 878 | w->Write<uint8_t>(0); // DW_LNS_COPY operands count. |
| 879 | w->Write<uint8_t>(1); // DW_LNS_ADVANCE_PC operands count. |
| 880 | w->Write<uint8_t>(1); // DW_LNS_ADVANCE_LINE operands count. |
| 881 | w->Write<uint8_t>(1); // DW_LNS_SET_FILE operands count. |
| 882 | w->Write<uint8_t>(1); // DW_LNS_SET_COLUMN operands count. |
| 883 | w->Write<uint8_t>(0); // DW_LNS_NEGATE_STMT operands count. |
| 884 | w->Write<uint8_t>(0); // Empty include_directories sequence. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 885 | w->WriteString(*desc_->GetFilename()); // File name. |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 886 | w->WriteULEB128(0); // Current directory. |
| 887 | w->WriteULEB128(0); // Unknown modification time. |
| 888 | w->WriteULEB128(0); // Unknown file size. |
| 889 | w->Write<uint8_t>(0); |
| 890 | prologue_length.set(static_cast<uint32_t>(w->position() - prologue_start)); |
| 891 | |
| 892 | WriteExtendedOpcode(w, DW_LNE_SET_ADDRESS, sizeof(intptr_t)); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 893 | w->Write<intptr_t>(desc_->CodeStart()); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 894 | w->Write<uint8_t>(DW_LNS_COPY); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 895 | |
| 896 | intptr_t pc = 0; |
| 897 | intptr_t line = 1; |
| 898 | bool is_statement = true; |
| 899 | |
| 900 | List<GDBJITLineInfo::PCInfo>* pc_info = desc_->lineinfo()->pc_info(); |
| 901 | pc_info->Sort(&ComparePCInfo); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 902 | |
| 903 | int pc_info_length = pc_info->length(); |
| 904 | for (int i = 0; i < pc_info_length; i++) { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 905 | GDBJITLineInfo::PCInfo* info = &pc_info->at(i); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 906 | ASSERT(info->pc_ >= pc); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 907 | |
| 908 | // Reduce bloating in the debug line table by removing duplicate line |
| 909 | // entries (per DWARF2 standard). |
| 910 | intptr_t new_line = desc_->GetScriptLineNumber(info->pos_); |
| 911 | if (new_line == line) { |
| 912 | continue; |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 913 | } |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 914 | |
| 915 | // Mark statement boundaries. For a better debugging experience, mark |
| 916 | // the last pc address in the function as a statement (e.g. "}"), so that |
| 917 | // a user can see the result of the last line executed in the function, |
| 918 | // should control reach the end. |
| 919 | if ((i+1) == pc_info_length) { |
| 920 | if (!is_statement) { |
| 921 | w->Write<uint8_t>(DW_LNS_NEGATE_STMT); |
| 922 | } |
| 923 | } else if (is_statement != info->is_statement_) { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 924 | w->Write<uint8_t>(DW_LNS_NEGATE_STMT); |
| 925 | is_statement = !is_statement; |
| 926 | } |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 927 | |
| 928 | // Generate special opcodes, if possible. This results in more compact |
| 929 | // debug line tables. See the DWARF 2.0 standard to learn more about |
| 930 | // special opcodes. |
| 931 | uintptr_t pc_diff = info->pc_ - pc; |
| 932 | intptr_t line_diff = new_line - line; |
| 933 | |
| 934 | // Compute special opcode (see DWARF 2.0 standard) |
| 935 | intptr_t special_opcode = (line_diff - line_base) + |
| 936 | (line_range * pc_diff) + opcode_base; |
| 937 | |
| 938 | // If special_opcode is less than or equal to 255, it can be used as a |
| 939 | // special opcode. If line_diff is larger than the max line increment |
| 940 | // allowed for a special opcode, or if line_diff is less than the minimum |
| 941 | // line that can be added to the line register (i.e. line_base), then |
| 942 | // special_opcode can't be used. |
| 943 | if ((special_opcode >= opcode_base) && (special_opcode <= 255) && |
| 944 | (line_diff <= max_line_incr) && (line_diff >= line_base)) { |
| 945 | w->Write<uint8_t>(special_opcode); |
| 946 | } else { |
| 947 | w->Write<uint8_t>(DW_LNS_ADVANCE_PC); |
| 948 | w->WriteSLEB128(pc_diff); |
| 949 | w->Write<uint8_t>(DW_LNS_ADVANCE_LINE); |
| 950 | w->WriteSLEB128(line_diff); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 951 | w->Write<uint8_t>(DW_LNS_COPY); |
| 952 | } |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 953 | |
| 954 | // Increment the pc and line operands. |
| 955 | pc += pc_diff; |
| 956 | line += line_diff; |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 957 | } |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 958 | // Advance the pc to the end of the routine, since the end sequence opcode |
| 959 | // requires this. |
| 960 | w->Write<uint8_t>(DW_LNS_ADVANCE_PC); |
| 961 | w->WriteSLEB128(desc_->CodeSize() - pc); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 962 | WriteExtendedOpcode(w, DW_LNE_END_SEQUENCE, 0); |
| 963 | total_length.set(static_cast<uint32_t>(w->position() - start)); |
| 964 | return true; |
| 965 | } |
| 966 | |
| 967 | private: |
| 968 | void WriteExtendedOpcode(Writer* w, |
| 969 | DWARF2ExtendedOpcode op, |
| 970 | size_t operands_size) { |
| 971 | w->Write<uint8_t>(0); |
| 972 | w->WriteULEB128(operands_size + 1); |
| 973 | w->Write<uint8_t>(op); |
| 974 | } |
| 975 | |
| 976 | static int ComparePCInfo(const GDBJITLineInfo::PCInfo* a, |
| 977 | const GDBJITLineInfo::PCInfo* b) { |
| 978 | if (a->pc_ == b->pc_) { |
| 979 | if (a->is_statement_ != b->is_statement_) { |
| 980 | return b->is_statement_ ? +1 : -1; |
| 981 | } |
| 982 | return 0; |
| 983 | } else if (a->pc_ > b->pc_) { |
| 984 | return +1; |
| 985 | } else { |
| 986 | return -1; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | CodeDescription* desc_; |
| 991 | }; |
| 992 | |
| 993 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 994 | #ifdef V8_TARGET_ARCH_X64 |
| 995 | |
| 996 | |
| 997 | class UnwindInfoSection : public ELFSection { |
| 998 | public: |
| 999 | explicit UnwindInfoSection(CodeDescription *desc); |
| 1000 | virtual bool WriteBody(Writer *w); |
| 1001 | |
| 1002 | int WriteCIE(Writer *w); |
| 1003 | void WriteFDE(Writer *w, int); |
| 1004 | |
| 1005 | void WriteFDEStateOnEntry(Writer *w); |
| 1006 | void WriteFDEStateAfterRBPPush(Writer *w); |
| 1007 | void WriteFDEStateAfterRBPSet(Writer *w); |
| 1008 | void WriteFDEStateAfterRBPPop(Writer *w); |
| 1009 | |
| 1010 | void WriteLength(Writer *w, |
| 1011 | Writer::Slot<uint32_t>* length_slot, |
| 1012 | int initial_position); |
| 1013 | |
| 1014 | private: |
| 1015 | CodeDescription *desc_; |
| 1016 | |
| 1017 | // DWARF3 Specification, Table 7.23 |
| 1018 | enum CFIInstructions { |
| 1019 | DW_CFA_ADVANCE_LOC = 0x40, |
| 1020 | DW_CFA_OFFSET = 0x80, |
| 1021 | DW_CFA_RESTORE = 0xC0, |
| 1022 | DW_CFA_NOP = 0x00, |
| 1023 | DW_CFA_SET_LOC = 0x01, |
| 1024 | DW_CFA_ADVANCE_LOC1 = 0x02, |
| 1025 | DW_CFA_ADVANCE_LOC2 = 0x03, |
| 1026 | DW_CFA_ADVANCE_LOC4 = 0x04, |
| 1027 | DW_CFA_OFFSET_EXTENDED = 0x05, |
| 1028 | DW_CFA_RESTORE_EXTENDED = 0x06, |
| 1029 | DW_CFA_UNDEFINED = 0x07, |
| 1030 | DW_CFA_SAME_VALUE = 0x08, |
| 1031 | DW_CFA_REGISTER = 0x09, |
| 1032 | DW_CFA_REMEMBER_STATE = 0x0A, |
| 1033 | DW_CFA_RESTORE_STATE = 0x0B, |
| 1034 | DW_CFA_DEF_CFA = 0x0C, |
| 1035 | DW_CFA_DEF_CFA_REGISTER = 0x0D, |
| 1036 | DW_CFA_DEF_CFA_OFFSET = 0x0E, |
| 1037 | |
| 1038 | DW_CFA_DEF_CFA_EXPRESSION = 0x0F, |
| 1039 | DW_CFA_EXPRESSION = 0x10, |
| 1040 | DW_CFA_OFFSET_EXTENDED_SF = 0x11, |
| 1041 | DW_CFA_DEF_CFA_SF = 0x12, |
| 1042 | DW_CFA_DEF_CFA_OFFSET_SF = 0x13, |
| 1043 | DW_CFA_VAL_OFFSET = 0x14, |
| 1044 | DW_CFA_VAL_OFFSET_SF = 0x15, |
| 1045 | DW_CFA_VAL_EXPRESSION = 0x16 |
| 1046 | }; |
| 1047 | |
| 1048 | // System V ABI, AMD64 Supplement, Version 0.99.5, Figure 3.36 |
| 1049 | enum RegisterMapping { |
| 1050 | // Only the relevant ones have been added to reduce clutter. |
| 1051 | AMD64_RBP = 6, |
| 1052 | AMD64_RSP = 7, |
| 1053 | AMD64_RA = 16 |
| 1054 | }; |
| 1055 | |
| 1056 | enum CFIConstants { |
| 1057 | CIE_ID = 0, |
| 1058 | CIE_VERSION = 1, |
| 1059 | CODE_ALIGN_FACTOR = 1, |
| 1060 | DATA_ALIGN_FACTOR = 1, |
| 1061 | RETURN_ADDRESS_REGISTER = AMD64_RA |
| 1062 | }; |
| 1063 | }; |
| 1064 | |
| 1065 | |
| 1066 | void UnwindInfoSection::WriteLength(Writer *w, |
| 1067 | Writer::Slot<uint32_t>* length_slot, |
| 1068 | int initial_position) { |
| 1069 | uint32_t align = (w->position() - initial_position) % kPointerSize; |
| 1070 | |
| 1071 | if (align != 0) { |
| 1072 | for (uint32_t i = 0; i < (kPointerSize - align); i++) { |
| 1073 | w->Write<uint8_t>(DW_CFA_NOP); |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | ASSERT((w->position() - initial_position) % kPointerSize == 0); |
| 1078 | length_slot->set(w->position() - initial_position); |
| 1079 | } |
| 1080 | |
| 1081 | |
| 1082 | UnwindInfoSection::UnwindInfoSection(CodeDescription *desc) |
| 1083 | : ELFSection(".eh_frame", TYPE_X86_64_UNWIND, 1), desc_(desc) |
| 1084 | { } |
| 1085 | |
| 1086 | int UnwindInfoSection::WriteCIE(Writer *w) { |
| 1087 | Writer::Slot<uint32_t> cie_length_slot = w->CreateSlotHere<uint32_t>(); |
| 1088 | uint32_t cie_position = w->position(); |
| 1089 | |
| 1090 | // Write out the CIE header. Currently no 'common instructions' are |
| 1091 | // emitted onto the CIE; every FDE has its own set of instructions. |
| 1092 | |
| 1093 | w->Write<uint32_t>(CIE_ID); |
| 1094 | w->Write<uint8_t>(CIE_VERSION); |
| 1095 | w->Write<uint8_t>(0); // Null augmentation string. |
| 1096 | w->WriteSLEB128(CODE_ALIGN_FACTOR); |
| 1097 | w->WriteSLEB128(DATA_ALIGN_FACTOR); |
| 1098 | w->Write<uint8_t>(RETURN_ADDRESS_REGISTER); |
| 1099 | |
| 1100 | WriteLength(w, &cie_length_slot, cie_position); |
| 1101 | |
| 1102 | return cie_position; |
| 1103 | } |
| 1104 | |
| 1105 | |
| 1106 | void UnwindInfoSection::WriteFDE(Writer *w, int cie_position) { |
| 1107 | // The only FDE for this function. The CFA is the current RBP. |
| 1108 | Writer::Slot<uint32_t> fde_length_slot = w->CreateSlotHere<uint32_t>(); |
| 1109 | int fde_position = w->position(); |
| 1110 | w->Write<int32_t>(fde_position - cie_position + 4); |
| 1111 | |
| 1112 | w->Write<uintptr_t>(desc_->CodeStart()); |
| 1113 | w->Write<uintptr_t>(desc_->CodeSize()); |
| 1114 | |
| 1115 | WriteFDEStateOnEntry(w); |
| 1116 | WriteFDEStateAfterRBPPush(w); |
| 1117 | WriteFDEStateAfterRBPSet(w); |
| 1118 | WriteFDEStateAfterRBPPop(w); |
| 1119 | |
| 1120 | WriteLength(w, &fde_length_slot, fde_position); |
| 1121 | } |
| 1122 | |
| 1123 | |
| 1124 | void UnwindInfoSection::WriteFDEStateOnEntry(Writer *w) { |
| 1125 | // The first state, just after the control has been transferred to the the |
| 1126 | // function. |
| 1127 | |
| 1128 | // RBP for this function will be the value of RSP after pushing the RBP |
| 1129 | // for the previous function. The previous RBP has not been pushed yet. |
| 1130 | w->Write<uint8_t>(DW_CFA_DEF_CFA_SF); |
| 1131 | w->WriteULEB128(AMD64_RSP); |
| 1132 | w->WriteSLEB128(-kPointerSize); |
| 1133 | |
| 1134 | // The RA is stored at location CFA + kCallerPCOffset. This is an invariant, |
| 1135 | // and hence omitted from the next states. |
| 1136 | w->Write<uint8_t>(DW_CFA_OFFSET_EXTENDED); |
| 1137 | w->WriteULEB128(AMD64_RA); |
| 1138 | w->WriteSLEB128(StandardFrameConstants::kCallerPCOffset); |
| 1139 | |
| 1140 | // The RBP of the previous function is still in RBP. |
| 1141 | w->Write<uint8_t>(DW_CFA_SAME_VALUE); |
| 1142 | w->WriteULEB128(AMD64_RBP); |
| 1143 | |
| 1144 | // Last location described by this entry. |
| 1145 | w->Write<uint8_t>(DW_CFA_SET_LOC); |
| 1146 | w->Write<uint64_t>( |
| 1147 | desc_->GetStackStateStartAddress(CodeDescription::POST_RBP_PUSH)); |
| 1148 | } |
| 1149 | |
| 1150 | |
| 1151 | void UnwindInfoSection::WriteFDEStateAfterRBPPush(Writer *w) { |
| 1152 | // The second state, just after RBP has been pushed. |
| 1153 | |
| 1154 | // RBP / CFA for this function is now the current RSP, so just set the |
| 1155 | // offset from the previous rule (from -8) to 0. |
| 1156 | w->Write<uint8_t>(DW_CFA_DEF_CFA_OFFSET); |
| 1157 | w->WriteULEB128(0); |
| 1158 | |
| 1159 | // The previous RBP is stored at CFA + kCallerFPOffset. This is an invariant |
| 1160 | // in this and the next state, and hence omitted in the next state. |
| 1161 | w->Write<uint8_t>(DW_CFA_OFFSET_EXTENDED); |
| 1162 | w->WriteULEB128(AMD64_RBP); |
| 1163 | w->WriteSLEB128(StandardFrameConstants::kCallerFPOffset); |
| 1164 | |
| 1165 | // Last location described by this entry. |
| 1166 | w->Write<uint8_t>(DW_CFA_SET_LOC); |
| 1167 | w->Write<uint64_t>( |
| 1168 | desc_->GetStackStateStartAddress(CodeDescription::POST_RBP_SET)); |
| 1169 | } |
| 1170 | |
| 1171 | |
| 1172 | void UnwindInfoSection::WriteFDEStateAfterRBPSet(Writer *w) { |
| 1173 | // The third state, after the RBP has been set. |
| 1174 | |
| 1175 | // The CFA can now directly be set to RBP. |
| 1176 | w->Write<uint8_t>(DW_CFA_DEF_CFA); |
| 1177 | w->WriteULEB128(AMD64_RBP); |
| 1178 | w->WriteULEB128(0); |
| 1179 | |
| 1180 | // Last location described by this entry. |
| 1181 | w->Write<uint8_t>(DW_CFA_SET_LOC); |
| 1182 | w->Write<uint64_t>( |
| 1183 | desc_->GetStackStateStartAddress(CodeDescription::POST_RBP_POP)); |
| 1184 | } |
| 1185 | |
| 1186 | |
| 1187 | void UnwindInfoSection::WriteFDEStateAfterRBPPop(Writer *w) { |
| 1188 | // The fourth (final) state. The RBP has been popped (just before issuing a |
| 1189 | // return). |
| 1190 | |
| 1191 | // The CFA can is now calculated in the same way as in the first state. |
| 1192 | w->Write<uint8_t>(DW_CFA_DEF_CFA_SF); |
| 1193 | w->WriteULEB128(AMD64_RSP); |
| 1194 | w->WriteSLEB128(-kPointerSize); |
| 1195 | |
| 1196 | // The RBP |
| 1197 | w->Write<uint8_t>(DW_CFA_OFFSET_EXTENDED); |
| 1198 | w->WriteULEB128(AMD64_RBP); |
| 1199 | w->WriteSLEB128(StandardFrameConstants::kCallerFPOffset); |
| 1200 | |
| 1201 | // Last location described by this entry. |
| 1202 | w->Write<uint8_t>(DW_CFA_SET_LOC); |
| 1203 | w->Write<uint64_t>(desc_->CodeEnd()); |
| 1204 | } |
| 1205 | |
| 1206 | |
| 1207 | bool UnwindInfoSection::WriteBody(Writer *w) { |
| 1208 | uint32_t cie_position = WriteCIE(w); |
| 1209 | WriteFDE(w, cie_position); |
| 1210 | return true; |
| 1211 | } |
| 1212 | |
| 1213 | |
| 1214 | #endif // V8_TARGET_ARCH_X64 |
| 1215 | |
| 1216 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1217 | static void CreateDWARFSections(CodeDescription* desc, ELF* elf) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1218 | if (desc->IsLineInfoAvailable()) { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1219 | elf->AddSection(new DebugInfoSection(desc)); |
| 1220 | elf->AddSection(new DebugAbbrevSection); |
| 1221 | elf->AddSection(new DebugLineSection(desc)); |
| 1222 | } |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1223 | #ifdef V8_TARGET_ARCH_X64 |
| 1224 | elf->AddSection(new UnwindInfoSection(desc)); |
| 1225 | #endif |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1226 | } |
| 1227 | |
| 1228 | |
| 1229 | // ------------------------------------------------------------------- |
| 1230 | // Binary GDB JIT Interface as described in |
| 1231 | // http://sourceware.org/gdb/onlinedocs/gdb/Declarations.html |
| 1232 | extern "C" { |
| 1233 | typedef enum { |
| 1234 | JIT_NOACTION = 0, |
| 1235 | JIT_REGISTER_FN, |
| 1236 | JIT_UNREGISTER_FN |
| 1237 | } JITAction; |
| 1238 | |
| 1239 | struct JITCodeEntry { |
| 1240 | JITCodeEntry* next_; |
| 1241 | JITCodeEntry* prev_; |
| 1242 | Address symfile_addr_; |
| 1243 | uint64_t symfile_size_; |
| 1244 | }; |
| 1245 | |
| 1246 | struct JITDescriptor { |
| 1247 | uint32_t version_; |
| 1248 | uint32_t action_flag_; |
| 1249 | JITCodeEntry *relevant_entry_; |
| 1250 | JITCodeEntry *first_entry_; |
| 1251 | }; |
| 1252 | |
| 1253 | // GDB will place breakpoint into this function. |
| 1254 | // To prevent GCC from inlining or removing it we place noinline attribute |
| 1255 | // and inline assembler statement inside. |
| 1256 | void __attribute__((noinline)) __jit_debug_register_code() { |
| 1257 | __asm__(""); |
| 1258 | } |
| 1259 | |
| 1260 | // GDB will inspect contents of this descriptor. |
| 1261 | // Static initialization is necessary to prevent GDB from seeing |
| 1262 | // uninitialized descriptor. |
| 1263 | JITDescriptor __jit_debug_descriptor = { 1, 0, 0, 0 }; |
| 1264 | } |
| 1265 | |
| 1266 | |
| 1267 | static JITCodeEntry* CreateCodeEntry(Address symfile_addr, |
| 1268 | uintptr_t symfile_size) { |
| 1269 | JITCodeEntry* entry = static_cast<JITCodeEntry*>( |
| 1270 | malloc(sizeof(JITCodeEntry) + symfile_size)); |
| 1271 | |
| 1272 | entry->symfile_addr_ = reinterpret_cast<Address>(entry + 1); |
| 1273 | entry->symfile_size_ = symfile_size; |
| 1274 | memcpy(entry->symfile_addr_, symfile_addr, symfile_size); |
| 1275 | |
| 1276 | entry->prev_ = entry->next_ = NULL; |
| 1277 | |
| 1278 | return entry; |
| 1279 | } |
| 1280 | |
| 1281 | |
| 1282 | static void DestroyCodeEntry(JITCodeEntry* entry) { |
| 1283 | free(entry); |
| 1284 | } |
| 1285 | |
| 1286 | |
| 1287 | static void RegisterCodeEntry(JITCodeEntry* entry) { |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1288 | #if defined(DEBUG) && !defined(WIN32) |
| 1289 | static int file_num = 0; |
| 1290 | if (FLAG_gdbjit_dump) { |
| 1291 | static const int kMaxFileNameSize = 64; |
| 1292 | static const char* kElfFilePrefix = "/tmp/elfdump"; |
| 1293 | static const char* kObjFileExt = ".o"; |
| 1294 | char file_name[64]; |
| 1295 | |
| 1296 | OS::SNPrintF(Vector<char>(file_name, kMaxFileNameSize), "%s%d%s", |
| 1297 | kElfFilePrefix, file_num++, kObjFileExt); |
| 1298 | WriteBytes(file_name, entry->symfile_addr_, entry->symfile_size_); |
| 1299 | } |
| 1300 | #endif |
| 1301 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1302 | entry->next_ = __jit_debug_descriptor.first_entry_; |
| 1303 | if (entry->next_ != NULL) entry->next_->prev_ = entry; |
| 1304 | __jit_debug_descriptor.first_entry_ = |
| 1305 | __jit_debug_descriptor.relevant_entry_ = entry; |
| 1306 | |
| 1307 | __jit_debug_descriptor.action_flag_ = JIT_REGISTER_FN; |
| 1308 | __jit_debug_register_code(); |
| 1309 | } |
| 1310 | |
| 1311 | |
| 1312 | static void UnregisterCodeEntry(JITCodeEntry* entry) { |
| 1313 | if (entry->prev_ != NULL) { |
| 1314 | entry->prev_->next_ = entry->next_; |
| 1315 | } else { |
| 1316 | __jit_debug_descriptor.first_entry_ = entry->next_; |
| 1317 | } |
| 1318 | |
| 1319 | if (entry->next_ != NULL) { |
| 1320 | entry->next_->prev_ = entry->prev_; |
| 1321 | } |
| 1322 | |
| 1323 | __jit_debug_descriptor.relevant_entry_ = entry; |
| 1324 | __jit_debug_descriptor.action_flag_ = JIT_UNREGISTER_FN; |
| 1325 | __jit_debug_register_code(); |
| 1326 | } |
| 1327 | |
| 1328 | |
| 1329 | static JITCodeEntry* CreateELFObject(CodeDescription* desc) { |
| 1330 | ZoneScope zone_scope(DELETE_ON_EXIT); |
| 1331 | |
| 1332 | ELF elf; |
| 1333 | Writer w(&elf); |
| 1334 | |
| 1335 | int text_section_index = elf.AddSection( |
| 1336 | new FullHeaderELFSection(".text", |
| 1337 | ELFSection::TYPE_NOBITS, |
| 1338 | kCodeAlignment, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1339 | desc->CodeStart(), |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1340 | 0, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1341 | desc->CodeSize(), |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1342 | ELFSection::FLAG_ALLOC | ELFSection::FLAG_EXEC)); |
| 1343 | |
| 1344 | CreateSymbolsTable(desc, &elf, text_section_index); |
| 1345 | |
| 1346 | CreateDWARFSections(desc, &elf); |
| 1347 | |
| 1348 | elf.Write(&w); |
| 1349 | |
| 1350 | return CreateCodeEntry(w.buffer(), w.position()); |
| 1351 | } |
| 1352 | |
| 1353 | |
| 1354 | static bool SameCodeObjects(void* key1, void* key2) { |
| 1355 | return key1 == key2; |
| 1356 | } |
| 1357 | |
| 1358 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1359 | static HashMap* GetEntries() { |
| 1360 | static HashMap* entries = NULL; |
| 1361 | if (entries == NULL) { |
| 1362 | entries = new HashMap(&SameCodeObjects); |
| 1363 | } |
| 1364 | return entries; |
| 1365 | } |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1366 | |
| 1367 | |
| 1368 | static uint32_t HashForCodeObject(Code* code) { |
| 1369 | static const uintptr_t kGoldenRatio = 2654435761u; |
| 1370 | uintptr_t hash = reinterpret_cast<uintptr_t>(code->address()); |
| 1371 | return static_cast<uint32_t>((hash >> kCodeAlignmentBits) * kGoldenRatio); |
| 1372 | } |
| 1373 | |
| 1374 | |
| 1375 | static const intptr_t kLineInfoTag = 0x1; |
| 1376 | |
| 1377 | |
| 1378 | static bool IsLineInfoTagged(void* ptr) { |
| 1379 | return 0 != (reinterpret_cast<intptr_t>(ptr) & kLineInfoTag); |
| 1380 | } |
| 1381 | |
| 1382 | |
| 1383 | static void* TagLineInfo(GDBJITLineInfo* ptr) { |
| 1384 | return reinterpret_cast<void*>( |
| 1385 | reinterpret_cast<intptr_t>(ptr) | kLineInfoTag); |
| 1386 | } |
| 1387 | |
| 1388 | |
| 1389 | static GDBJITLineInfo* UntagLineInfo(void* ptr) { |
| 1390 | return reinterpret_cast<GDBJITLineInfo*>( |
| 1391 | reinterpret_cast<intptr_t>(ptr) & ~kLineInfoTag); |
| 1392 | } |
| 1393 | |
| 1394 | |
| 1395 | void GDBJITInterface::AddCode(Handle<String> name, |
| 1396 | Handle<Script> script, |
| 1397 | Handle<Code> code) { |
| 1398 | if (!FLAG_gdbjit) return; |
| 1399 | |
| 1400 | // Force initialization of line_ends array. |
| 1401 | GetScriptLineNumber(script, 0); |
| 1402 | |
| 1403 | if (!name.is_null()) { |
| 1404 | SmartPointer<char> name_cstring = name->ToCString(DISALLOW_NULLS); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1405 | AddCode(*name_cstring, *code, GDBJITInterface::FUNCTION, *script); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1406 | } else { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1407 | AddCode("", *code, GDBJITInterface::FUNCTION, *script); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1408 | } |
| 1409 | } |
| 1410 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1411 | static void AddUnwindInfo(CodeDescription *desc) { |
| 1412 | #ifdef V8_TARGET_ARCH_X64 |
| 1413 | if (desc->tag() == GDBJITInterface::FUNCTION) { |
| 1414 | // To avoid propagating unwinding information through |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1415 | // compilation pipeline we use an approximation. |
| 1416 | // For most use cases this should not affect usability. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1417 | static const int kFramePointerPushOffset = 1; |
| 1418 | static const int kFramePointerSetOffset = 4; |
| 1419 | static const int kFramePointerPopOffset = -3; |
| 1420 | |
| 1421 | uintptr_t frame_pointer_push_address = |
| 1422 | desc->CodeStart() + kFramePointerPushOffset; |
| 1423 | |
| 1424 | uintptr_t frame_pointer_set_address = |
| 1425 | desc->CodeStart() + kFramePointerSetOffset; |
| 1426 | |
| 1427 | uintptr_t frame_pointer_pop_address = |
| 1428 | desc->CodeEnd() + kFramePointerPopOffset; |
| 1429 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1430 | desc->SetStackStateStartAddress(CodeDescription::POST_RBP_PUSH, |
| 1431 | frame_pointer_push_address); |
| 1432 | desc->SetStackStateStartAddress(CodeDescription::POST_RBP_SET, |
| 1433 | frame_pointer_set_address); |
| 1434 | desc->SetStackStateStartAddress(CodeDescription::POST_RBP_POP, |
| 1435 | frame_pointer_pop_address); |
| 1436 | } else { |
| 1437 | desc->SetStackStateStartAddress(CodeDescription::POST_RBP_PUSH, |
| 1438 | desc->CodeStart()); |
| 1439 | desc->SetStackStateStartAddress(CodeDescription::POST_RBP_SET, |
| 1440 | desc->CodeStart()); |
| 1441 | desc->SetStackStateStartAddress(CodeDescription::POST_RBP_POP, |
| 1442 | desc->CodeEnd()); |
| 1443 | } |
| 1444 | #endif // V8_TARGET_ARCH_X64 |
| 1445 | } |
| 1446 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1447 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame^] | 1448 | Mutex* GDBJITInterface::mutex_ = OS::CreateMutex(); |
| 1449 | |
| 1450 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1451 | void GDBJITInterface::AddCode(const char* name, |
| 1452 | Code* code, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1453 | GDBJITInterface::CodeTag tag, |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1454 | Script* script) { |
| 1455 | if (!FLAG_gdbjit) return; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame^] | 1456 | |
| 1457 | ScopedLock lock(mutex_); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1458 | AssertNoAllocation no_gc; |
| 1459 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1460 | HashMap::Entry* e = GetEntries()->Lookup(code, HashForCodeObject(code), true); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1461 | if (e->value != NULL && !IsLineInfoTagged(e->value)) return; |
| 1462 | |
| 1463 | GDBJITLineInfo* lineinfo = UntagLineInfo(e->value); |
| 1464 | CodeDescription code_desc(name, |
| 1465 | code, |
| 1466 | script != NULL ? Handle<Script>(script) |
| 1467 | : Handle<Script>(), |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1468 | lineinfo, |
| 1469 | tag); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1470 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1471 | if (!FLAG_gdbjit_full && !code_desc.IsLineInfoAvailable()) { |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1472 | delete lineinfo; |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1473 | GetEntries()->Remove(code, HashForCodeObject(code)); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1474 | return; |
| 1475 | } |
| 1476 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1477 | AddUnwindInfo(&code_desc); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1478 | JITCodeEntry* entry = CreateELFObject(&code_desc); |
| 1479 | ASSERT(!IsLineInfoTagged(entry)); |
| 1480 | |
| 1481 | delete lineinfo; |
| 1482 | e->value = entry; |
| 1483 | |
| 1484 | RegisterCodeEntry(entry); |
| 1485 | } |
| 1486 | |
| 1487 | |
| 1488 | void GDBJITInterface::AddCode(GDBJITInterface::CodeTag tag, |
| 1489 | const char* name, |
| 1490 | Code* code) { |
| 1491 | if (!FLAG_gdbjit) return; |
| 1492 | |
| 1493 | EmbeddedVector<char, 256> buffer; |
| 1494 | StringBuilder builder(buffer.start(), buffer.length()); |
| 1495 | |
| 1496 | builder.AddString(Tag2String(tag)); |
| 1497 | if ((name != NULL) && (*name != '\0')) { |
| 1498 | builder.AddString(": "); |
| 1499 | builder.AddString(name); |
| 1500 | } else { |
| 1501 | builder.AddFormatted(": code object %p", static_cast<void*>(code)); |
| 1502 | } |
| 1503 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1504 | AddCode(builder.Finalize(), code, tag); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1505 | } |
| 1506 | |
| 1507 | |
| 1508 | void GDBJITInterface::AddCode(GDBJITInterface::CodeTag tag, |
| 1509 | String* name, |
| 1510 | Code* code) { |
| 1511 | if (!FLAG_gdbjit) return; |
| 1512 | AddCode(tag, name != NULL ? *name->ToCString(DISALLOW_NULLS) : NULL, code); |
| 1513 | } |
| 1514 | |
| 1515 | |
| 1516 | void GDBJITInterface::AddCode(GDBJITInterface::CodeTag tag, Code* code) { |
| 1517 | if (!FLAG_gdbjit) return; |
| 1518 | |
| 1519 | AddCode(tag, "", code); |
| 1520 | } |
| 1521 | |
| 1522 | |
| 1523 | void GDBJITInterface::RemoveCode(Code* code) { |
| 1524 | if (!FLAG_gdbjit) return; |
| 1525 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame^] | 1526 | ScopedLock lock(mutex_); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1527 | HashMap::Entry* e = GetEntries()->Lookup(code, |
| 1528 | HashForCodeObject(code), |
| 1529 | false); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1530 | if (e == NULL) return; |
| 1531 | |
| 1532 | if (IsLineInfoTagged(e->value)) { |
| 1533 | delete UntagLineInfo(e->value); |
| 1534 | } else { |
| 1535 | JITCodeEntry* entry = static_cast<JITCodeEntry*>(e->value); |
| 1536 | UnregisterCodeEntry(entry); |
| 1537 | DestroyCodeEntry(entry); |
| 1538 | } |
| 1539 | e->value = NULL; |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1540 | GetEntries()->Remove(code, HashForCodeObject(code)); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1541 | } |
| 1542 | |
| 1543 | |
| 1544 | void GDBJITInterface::RegisterDetailedLineInfo(Code* code, |
| 1545 | GDBJITLineInfo* line_info) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame^] | 1546 | ScopedLock lock(mutex_); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1547 | ASSERT(!IsLineInfoTagged(line_info)); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1548 | HashMap::Entry* e = GetEntries()->Lookup(code, HashForCodeObject(code), true); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1549 | ASSERT(e->value == NULL); |
| 1550 | e->value = TagLineInfo(line_info); |
| 1551 | } |
| 1552 | |
| 1553 | |
| 1554 | } } // namespace v8::internal |
| 1555 | #endif |