1 //===-- SourceManager.cpp -------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "lldb/Core/SourceManager.h" 10 11 #include "lldb/Core/Address.h" 12 #include "lldb/Core/AddressRange.h" 13 #include "lldb/Core/Debugger.h" 14 #include "lldb/Core/FormatEntity.h" 15 #include "lldb/Core/Highlighter.h" 16 #include "lldb/Core/Module.h" 17 #include "lldb/Core/ModuleList.h" 18 #include "lldb/Host/FileSystem.h" 19 #include "lldb/Symbol/CompileUnit.h" 20 #include "lldb/Symbol/Function.h" 21 #include "lldb/Symbol/LineEntry.h" 22 #include "lldb/Symbol/SymbolContext.h" 23 #include "lldb/Target/PathMappingList.h" 24 #include "lldb/Target/Target.h" 25 #include "lldb/Utility/AnsiTerminal.h" 26 #include "lldb/Utility/ConstString.h" 27 #include "lldb/Utility/DataBuffer.h" 28 #include "lldb/Utility/DataBufferLLVM.h" 29 #include "lldb/Utility/RegularExpression.h" 30 #include "lldb/Utility/Stream.h" 31 #include "lldb/lldb-enumerations.h" 32 33 #include "llvm/ADT/Twine.h" 34 35 #include <memory> 36 #include <utility> 37 38 #include <assert.h> 39 #include <stdio.h> 40 41 namespace lldb_private { 42 class ExecutionContext; 43 } 44 namespace lldb_private { 45 class ValueObject; 46 } 47 48 using namespace lldb; 49 using namespace lldb_private; 50 51 static inline bool is_newline_char(char ch) { return ch == '\n' || ch == '\r'; } 52 53 // SourceManager constructor 54 SourceManager::SourceManager(const TargetSP &target_sp) 55 : m_last_line(0), m_last_count(0), m_default_set(false), 56 m_target_wp(target_sp), 57 m_debugger_wp(target_sp->GetDebugger().shared_from_this()) {} 58 59 SourceManager::SourceManager(const DebuggerSP &debugger_sp) 60 : m_last_line(0), m_last_count(0), m_default_set(false), m_target_wp(), 61 m_debugger_wp(debugger_sp) {} 62 63 // Destructor 64 SourceManager::~SourceManager() {} 65 66 SourceManager::FileSP SourceManager::GetFile(const FileSpec &file_spec) { 67 if (!file_spec) 68 return nullptr; 69 70 DebuggerSP debugger_sp(m_debugger_wp.lock()); 71 FileSP file_sp; 72 if (debugger_sp && debugger_sp->GetUseSourceCache()) 73 file_sp = debugger_sp->GetSourceFileCache().FindSourceFile(file_spec); 74 75 TargetSP target_sp(m_target_wp.lock()); 76 77 // It the target source path map has been updated, get this file again so we 78 // can successfully remap the source file 79 if (target_sp && file_sp && 80 file_sp->GetSourceMapModificationID() != 81 target_sp->GetSourcePathMap().GetModificationID()) 82 file_sp.reset(); 83 84 // Update the file contents if needed if we found a file 85 if (file_sp) 86 file_sp->UpdateIfNeeded(); 87 88 // If file_sp is no good or it points to a non-existent file, reset it. 89 if (!file_sp || !FileSystem::Instance().Exists(file_sp->GetFileSpec())) { 90 if (target_sp) 91 file_sp = std::make_shared<File>(file_spec, target_sp.get()); 92 else 93 file_sp = std::make_shared<File>(file_spec, debugger_sp); 94 95 if (debugger_sp && debugger_sp->GetUseSourceCache()) 96 debugger_sp->GetSourceFileCache().AddSourceFile(file_sp); 97 } 98 return file_sp; 99 } 100 101 static bool should_highlight_source(DebuggerSP debugger_sp) { 102 if (!debugger_sp) 103 return false; 104 105 // We don't use ANSI stop column formatting if the debugger doesn't think it 106 // should be using color. 107 if (!debugger_sp->GetUseColor()) 108 return false; 109 110 return debugger_sp->GetHighlightSource(); 111 } 112 113 static bool should_show_stop_column_with_ansi(DebuggerSP debugger_sp) { 114 // We don't use ANSI stop column formatting if we can't lookup values from 115 // the debugger. 116 if (!debugger_sp) 117 return false; 118 119 // We don't use ANSI stop column formatting if the debugger doesn't think it 120 // should be using color. 121 if (!debugger_sp->GetUseColor()) 122 return false; 123 124 // We only use ANSI stop column formatting if we're either supposed to show 125 // ANSI where available (which we know we have when we get to this point), or 126 // if we're only supposed to use ANSI. 127 const auto value = debugger_sp->GetStopShowColumn(); 128 return ((value == eStopShowColumnAnsiOrCaret) || 129 (value == eStopShowColumnAnsi)); 130 } 131 132 static bool should_show_stop_column_with_caret(DebuggerSP debugger_sp) { 133 // We don't use text-based stop column formatting if we can't lookup values 134 // from the debugger. 135 if (!debugger_sp) 136 return false; 137 138 // If we're asked to show the first available of ANSI or caret, then we do 139 // show the caret when ANSI is not available. 140 const auto value = debugger_sp->GetStopShowColumn(); 141 if ((value == eStopShowColumnAnsiOrCaret) && !debugger_sp->GetUseColor()) 142 return true; 143 144 // The only other time we use caret is if we're explicitly asked to show 145 // caret. 146 return value == eStopShowColumnCaret; 147 } 148 149 static bool should_show_stop_line_with_ansi(DebuggerSP debugger_sp) { 150 return debugger_sp && debugger_sp->GetUseColor(); 151 } 152 153 size_t SourceManager::DisplaySourceLinesWithLineNumbersUsingLastFile( 154 uint32_t start_line, uint32_t count, uint32_t curr_line, uint32_t column, 155 const char *current_line_cstr, Stream *s, 156 const SymbolContextList *bp_locs) { 157 if (count == 0) 158 return 0; 159 160 Stream::ByteDelta delta(*s); 161 162 if (start_line == 0) { 163 if (m_last_line != 0 && m_last_line != UINT32_MAX) 164 start_line = m_last_line + m_last_count; 165 else 166 start_line = 1; 167 } 168 169 if (!m_default_set) { 170 FileSpec tmp_spec; 171 uint32_t tmp_line; 172 GetDefaultFileAndLine(tmp_spec, tmp_line); 173 } 174 175 m_last_line = start_line; 176 m_last_count = count; 177 178 if (FileSP last_file_sp = GetLastFile()) { 179 const uint32_t end_line = start_line + count - 1; 180 for (uint32_t line = start_line; line <= end_line; ++line) { 181 if (!last_file_sp->LineIsValid(line)) { 182 m_last_line = UINT32_MAX; 183 break; 184 } 185 186 std::string prefix; 187 if (bp_locs) { 188 uint32_t bp_count = bp_locs->NumLineEntriesWithLine(line); 189 190 if (bp_count > 0) 191 prefix = llvm::formatv("[{0}]", bp_count); 192 else 193 prefix = " "; 194 } 195 196 char buffer[3]; 197 sprintf(buffer, "%2.2s", (line == curr_line) ? current_line_cstr : ""); 198 std::string current_line_highlight(buffer); 199 200 auto debugger_sp = m_debugger_wp.lock(); 201 if (should_show_stop_line_with_ansi(debugger_sp)) { 202 current_line_highlight = ansi::FormatAnsiTerminalCodes( 203 (debugger_sp->GetStopShowLineMarkerAnsiPrefix() + 204 current_line_highlight + 205 debugger_sp->GetStopShowLineMarkerAnsiSuffix()) 206 .str()); 207 } 208 209 s->Printf("%s%s %-4u\t", prefix.c_str(), current_line_highlight.c_str(), 210 line); 211 212 // So far we treated column 0 as a special 'no column value', but 213 // DisplaySourceLines starts counting columns from 0 (and no column is 214 // expressed by passing an empty optional). 215 llvm::Optional<size_t> columnToHighlight; 216 if (line == curr_line && column) 217 columnToHighlight = column - 1; 218 219 size_t this_line_size = 220 last_file_sp->DisplaySourceLines(line, columnToHighlight, 0, 0, s); 221 if (column != 0 && line == curr_line && 222 should_show_stop_column_with_caret(debugger_sp)) { 223 // Display caret cursor. 224 std::string src_line; 225 last_file_sp->GetLine(line, src_line); 226 s->Printf(" \t"); 227 // Insert a space for every non-tab character in the source line. 228 for (size_t i = 0; i + 1 < column && i < src_line.length(); ++i) 229 s->PutChar(src_line[i] == '\t' ? '\t' : ' '); 230 // Now add the caret. 231 s->Printf("^\n"); 232 } 233 if (this_line_size == 0) { 234 m_last_line = UINT32_MAX; 235 break; 236 } 237 } 238 } 239 return *delta; 240 } 241 242 size_t SourceManager::DisplaySourceLinesWithLineNumbers( 243 const FileSpec &file_spec, uint32_t line, uint32_t column, 244 uint32_t context_before, uint32_t context_after, 245 const char *current_line_cstr, Stream *s, 246 const SymbolContextList *bp_locs) { 247 FileSP file_sp(GetFile(file_spec)); 248 249 uint32_t start_line; 250 uint32_t count = context_before + context_after + 1; 251 if (line > context_before) 252 start_line = line - context_before; 253 else 254 start_line = 1; 255 256 FileSP last_file_sp(GetLastFile()); 257 if (last_file_sp.get() != file_sp.get()) { 258 if (line == 0) 259 m_last_line = 0; 260 m_last_file_spec = file_spec; 261 } 262 return DisplaySourceLinesWithLineNumbersUsingLastFile( 263 start_line, count, line, column, current_line_cstr, s, bp_locs); 264 } 265 266 size_t SourceManager::DisplayMoreWithLineNumbers( 267 Stream *s, uint32_t count, bool reverse, const SymbolContextList *bp_locs) { 268 // If we get called before anybody has set a default file and line, then try 269 // to figure it out here. 270 FileSP last_file_sp(GetLastFile()); 271 const bool have_default_file_line = last_file_sp && m_last_line > 0; 272 if (!m_default_set) { 273 FileSpec tmp_spec; 274 uint32_t tmp_line; 275 GetDefaultFileAndLine(tmp_spec, tmp_line); 276 } 277 278 if (last_file_sp) { 279 if (m_last_line == UINT32_MAX) 280 return 0; 281 282 if (reverse && m_last_line == 1) 283 return 0; 284 285 if (count > 0) 286 m_last_count = count; 287 else if (m_last_count == 0) 288 m_last_count = 10; 289 290 if (m_last_line > 0) { 291 if (reverse) { 292 // If this is the first time we've done a reverse, then back up one 293 // more time so we end up showing the chunk before the last one we've 294 // shown: 295 if (m_last_line > m_last_count) 296 m_last_line -= m_last_count; 297 else 298 m_last_line = 1; 299 } else if (have_default_file_line) 300 m_last_line += m_last_count; 301 } else 302 m_last_line = 1; 303 304 const uint32_t column = 0; 305 return DisplaySourceLinesWithLineNumbersUsingLastFile( 306 m_last_line, m_last_count, UINT32_MAX, column, "", s, bp_locs); 307 } 308 return 0; 309 } 310 311 bool SourceManager::SetDefaultFileAndLine(const FileSpec &file_spec, 312 uint32_t line) { 313 m_default_set = true; 314 FileSP file_sp(GetFile(file_spec)); 315 316 if (file_sp) { 317 m_last_line = line; 318 m_last_file_spec = file_spec; 319 return true; 320 } else { 321 return false; 322 } 323 } 324 325 bool SourceManager::GetDefaultFileAndLine(FileSpec &file_spec, uint32_t &line) { 326 if (FileSP last_file_sp = GetLastFile()) { 327 file_spec = m_last_file_spec; 328 line = m_last_line; 329 return true; 330 } else if (!m_default_set) { 331 TargetSP target_sp(m_target_wp.lock()); 332 333 if (target_sp) { 334 // If nobody has set the default file and line then try here. If there's 335 // no executable, then we will try again later when there is one. 336 // Otherwise, if we can't find it we won't look again, somebody will have 337 // to set it (for instance when we stop somewhere...) 338 Module *executable_ptr = target_sp->GetExecutableModulePointer(); 339 if (executable_ptr) { 340 SymbolContextList sc_list; 341 ConstString main_name("main"); 342 bool symbols_okay = false; // Force it to be a debug symbol. 343 bool inlines_okay = true; 344 executable_ptr->FindFunctions(main_name, CompilerDeclContext(), 345 lldb::eFunctionNameTypeBase, inlines_okay, 346 symbols_okay, sc_list); 347 size_t num_matches = sc_list.GetSize(); 348 for (size_t idx = 0; idx < num_matches; idx++) { 349 SymbolContext sc; 350 sc_list.GetContextAtIndex(idx, sc); 351 if (sc.function) { 352 lldb_private::LineEntry line_entry; 353 if (sc.function->GetAddressRange() 354 .GetBaseAddress() 355 .CalculateSymbolContextLineEntry(line_entry)) { 356 SetDefaultFileAndLine(line_entry.file, line_entry.line); 357 file_spec = m_last_file_spec; 358 line = m_last_line; 359 return true; 360 } 361 } 362 } 363 } 364 } 365 } 366 return false; 367 } 368 369 void SourceManager::FindLinesMatchingRegex(FileSpec &file_spec, 370 RegularExpression ®ex, 371 uint32_t start_line, 372 uint32_t end_line, 373 std::vector<uint32_t> &match_lines) { 374 match_lines.clear(); 375 FileSP file_sp = GetFile(file_spec); 376 if (!file_sp) 377 return; 378 return file_sp->FindLinesMatchingRegex(regex, start_line, end_line, 379 match_lines); 380 } 381 382 SourceManager::File::File(const FileSpec &file_spec, 383 lldb::DebuggerSP debugger_sp) 384 : m_file_spec_orig(file_spec), m_file_spec(file_spec), 385 m_mod_time(FileSystem::Instance().GetModificationTime(file_spec)), 386 m_debugger_wp(debugger_sp) { 387 CommonInitializer(file_spec, nullptr); 388 } 389 390 SourceManager::File::File(const FileSpec &file_spec, Target *target) 391 : m_file_spec_orig(file_spec), m_file_spec(file_spec), 392 m_mod_time(FileSystem::Instance().GetModificationTime(file_spec)), 393 m_debugger_wp(target ? target->GetDebugger().shared_from_this() 394 : DebuggerSP()) { 395 CommonInitializer(file_spec, target); 396 } 397 398 void SourceManager::File::CommonInitializer(const FileSpec &file_spec, 399 Target *target) { 400 if (m_mod_time == llvm::sys::TimePoint<>()) { 401 if (target) { 402 m_source_map_mod_id = target->GetSourcePathMap().GetModificationID(); 403 404 if (!file_spec.GetDirectory() && file_spec.GetFilename()) { 405 // If this is just a file name, lets see if we can find it in the 406 // target: 407 bool check_inlines = false; 408 SymbolContextList sc_list; 409 size_t num_matches = 410 target->GetImages().ResolveSymbolContextForFilePath( 411 file_spec.GetFilename().AsCString(), 0, check_inlines, 412 SymbolContextItem(eSymbolContextModule | 413 eSymbolContextCompUnit), 414 sc_list); 415 bool got_multiple = false; 416 if (num_matches != 0) { 417 if (num_matches > 1) { 418 SymbolContext sc; 419 CompileUnit *test_cu = nullptr; 420 421 for (unsigned i = 0; i < num_matches; i++) { 422 sc_list.GetContextAtIndex(i, sc); 423 if (sc.comp_unit) { 424 if (test_cu) { 425 if (test_cu != sc.comp_unit) 426 got_multiple = true; 427 break; 428 } else 429 test_cu = sc.comp_unit; 430 } 431 } 432 } 433 if (!got_multiple) { 434 SymbolContext sc; 435 sc_list.GetContextAtIndex(0, sc); 436 if (sc.comp_unit) 437 m_file_spec = sc.comp_unit->GetPrimaryFile(); 438 m_mod_time = FileSystem::Instance().GetModificationTime(m_file_spec); 439 } 440 } 441 } 442 // Try remapping if m_file_spec does not correspond to an existing file. 443 if (!FileSystem::Instance().Exists(m_file_spec)) { 444 FileSpec new_file_spec; 445 // Check target specific source remappings first, then fall back to 446 // modules objects can have individual path remappings that were 447 // detected when the debug info for a module was found. then 448 if (target->GetSourcePathMap().FindFile(m_file_spec, new_file_spec) || 449 target->GetImages().FindSourceFile(m_file_spec, new_file_spec)) { 450 m_file_spec = new_file_spec; 451 m_mod_time = FileSystem::Instance().GetModificationTime(m_file_spec); 452 } 453 } 454 } 455 } 456 457 if (m_mod_time != llvm::sys::TimePoint<>()) 458 m_data_sp = FileSystem::Instance().CreateDataBuffer(m_file_spec); 459 } 460 461 uint32_t SourceManager::File::GetLineOffset(uint32_t line) { 462 if (line == 0) 463 return UINT32_MAX; 464 465 if (line == 1) 466 return 0; 467 468 if (CalculateLineOffsets(line)) { 469 if (line < m_offsets.size()) 470 return m_offsets[line - 1]; // yes we want "line - 1" in the index 471 } 472 return UINT32_MAX; 473 } 474 475 uint32_t SourceManager::File::GetNumLines() { 476 CalculateLineOffsets(); 477 return m_offsets.size(); 478 } 479 480 const char *SourceManager::File::PeekLineData(uint32_t line) { 481 if (!LineIsValid(line)) 482 return nullptr; 483 484 size_t line_offset = GetLineOffset(line); 485 if (line_offset < m_data_sp->GetByteSize()) 486 return (const char *)m_data_sp->GetBytes() + line_offset; 487 return nullptr; 488 } 489 490 uint32_t SourceManager::File::GetLineLength(uint32_t line, 491 bool include_newline_chars) { 492 if (!LineIsValid(line)) 493 return false; 494 495 size_t start_offset = GetLineOffset(line); 496 size_t end_offset = GetLineOffset(line + 1); 497 if (end_offset == UINT32_MAX) 498 end_offset = m_data_sp->GetByteSize(); 499 500 if (end_offset > start_offset) { 501 uint32_t length = end_offset - start_offset; 502 if (!include_newline_chars) { 503 const char *line_start = 504 (const char *)m_data_sp->GetBytes() + start_offset; 505 while (length > 0) { 506 const char last_char = line_start[length - 1]; 507 if ((last_char == '\r') || (last_char == '\n')) 508 --length; 509 else 510 break; 511 } 512 } 513 return length; 514 } 515 return 0; 516 } 517 518 bool SourceManager::File::LineIsValid(uint32_t line) { 519 if (line == 0) 520 return false; 521 522 if (CalculateLineOffsets(line)) 523 return line < m_offsets.size(); 524 return false; 525 } 526 527 void SourceManager::File::UpdateIfNeeded() { 528 // TODO: use host API to sign up for file modifications to anything in our 529 // source cache and only update when we determine a file has been updated. 530 // For now we check each time we want to display info for the file. 531 auto curr_mod_time = FileSystem::Instance().GetModificationTime(m_file_spec); 532 533 if (curr_mod_time != llvm::sys::TimePoint<>() && 534 m_mod_time != curr_mod_time) { 535 m_mod_time = curr_mod_time; 536 m_data_sp = FileSystem::Instance().CreateDataBuffer(m_file_spec); 537 m_offsets.clear(); 538 } 539 } 540 541 size_t SourceManager::File::DisplaySourceLines(uint32_t line, 542 llvm::Optional<size_t> column, 543 uint32_t context_before, 544 uint32_t context_after, 545 Stream *s) { 546 // Nothing to write if there's no stream. 547 if (!s) 548 return 0; 549 550 // Sanity check m_data_sp before proceeding. 551 if (!m_data_sp) 552 return 0; 553 554 size_t bytes_written = s->GetWrittenBytes(); 555 556 auto debugger_sp = m_debugger_wp.lock(); 557 558 HighlightStyle style; 559 // Use the default Vim style if source highlighting is enabled. 560 if (should_highlight_source(debugger_sp)) 561 style = HighlightStyle::MakeVimStyle(); 562 563 // If we should mark the stop column with color codes, then copy the prefix 564 // and suffix to our color style. 565 if (should_show_stop_column_with_ansi(debugger_sp)) 566 style.selected.Set(debugger_sp->GetStopShowColumnAnsiPrefix(), 567 debugger_sp->GetStopShowColumnAnsiSuffix()); 568 569 HighlighterManager mgr; 570 std::string path = GetFileSpec().GetPath(/*denormalize*/ false); 571 // FIXME: Find a way to get the definitive language this file was written in 572 // and pass it to the highlighter. 573 const auto &h = mgr.getHighlighterFor(lldb::eLanguageTypeUnknown, path); 574 575 const uint32_t start_line = 576 line <= context_before ? 1 : line - context_before; 577 const uint32_t start_line_offset = GetLineOffset(start_line); 578 if (start_line_offset != UINT32_MAX) { 579 const uint32_t end_line = line + context_after; 580 uint32_t end_line_offset = GetLineOffset(end_line + 1); 581 if (end_line_offset == UINT32_MAX) 582 end_line_offset = m_data_sp->GetByteSize(); 583 584 assert(start_line_offset <= end_line_offset); 585 if (start_line_offset < end_line_offset) { 586 size_t count = end_line_offset - start_line_offset; 587 const uint8_t *cstr = m_data_sp->GetBytes() + start_line_offset; 588 589 auto ref = llvm::StringRef(reinterpret_cast<const char *>(cstr), count); 590 591 h.Highlight(style, ref, column, "", *s); 592 593 // Ensure we get an end of line character one way or another. 594 if (!is_newline_char(ref.back())) 595 s->EOL(); 596 } 597 } 598 return s->GetWrittenBytes() - bytes_written; 599 } 600 601 void SourceManager::File::FindLinesMatchingRegex( 602 RegularExpression ®ex, uint32_t start_line, uint32_t end_line, 603 std::vector<uint32_t> &match_lines) { 604 match_lines.clear(); 605 606 if (!LineIsValid(start_line) || 607 (end_line != UINT32_MAX && !LineIsValid(end_line))) 608 return; 609 if (start_line > end_line) 610 return; 611 612 for (uint32_t line_no = start_line; line_no < end_line; line_no++) { 613 std::string buffer; 614 if (!GetLine(line_no, buffer)) 615 break; 616 if (regex.Execute(buffer)) { 617 match_lines.push_back(line_no); 618 } 619 } 620 } 621 622 bool lldb_private::operator==(const SourceManager::File &lhs, 623 const SourceManager::File &rhs) { 624 if (lhs.m_file_spec != rhs.m_file_spec) 625 return false; 626 return lhs.m_mod_time == rhs.m_mod_time; 627 } 628 629 bool SourceManager::File::CalculateLineOffsets(uint32_t line) { 630 line = 631 UINT32_MAX; // TODO: take this line out when we support partial indexing 632 if (line == UINT32_MAX) { 633 // Already done? 634 if (!m_offsets.empty() && m_offsets[0] == UINT32_MAX) 635 return true; 636 637 if (m_offsets.empty()) { 638 if (m_data_sp.get() == nullptr) 639 return false; 640 641 const char *start = (char *)m_data_sp->GetBytes(); 642 if (start) { 643 const char *end = start + m_data_sp->GetByteSize(); 644 645 // Calculate all line offsets from scratch 646 647 // Push a 1 at index zero to indicate the file has been completely 648 // indexed. 649 m_offsets.push_back(UINT32_MAX); 650 const char *s; 651 for (s = start; s < end; ++s) { 652 char curr_ch = *s; 653 if (is_newline_char(curr_ch)) { 654 if (s + 1 < end) { 655 char next_ch = s[1]; 656 if (is_newline_char(next_ch)) { 657 if (curr_ch != next_ch) 658 ++s; 659 } 660 } 661 m_offsets.push_back(s + 1 - start); 662 } 663 } 664 if (!m_offsets.empty()) { 665 if (m_offsets.back() < size_t(end - start)) 666 m_offsets.push_back(end - start); 667 } 668 return true; 669 } 670 } else { 671 // Some lines have been populated, start where we last left off 672 assert("Not implemented yet" && false); 673 } 674 675 } else { 676 // Calculate all line offsets up to "line" 677 assert("Not implemented yet" && false); 678 } 679 return false; 680 } 681 682 bool SourceManager::File::GetLine(uint32_t line_no, std::string &buffer) { 683 if (!LineIsValid(line_no)) 684 return false; 685 686 size_t start_offset = GetLineOffset(line_no); 687 size_t end_offset = GetLineOffset(line_no + 1); 688 if (end_offset == UINT32_MAX) { 689 end_offset = m_data_sp->GetByteSize(); 690 } 691 buffer.assign((char *)m_data_sp->GetBytes() + start_offset, 692 end_offset - start_offset); 693 694 return true; 695 } 696 697 void SourceManager::SourceFileCache::AddSourceFile(const FileSP &file_sp) { 698 FileSpec file_spec = file_sp->GetFileSpec(); 699 FileCache::iterator pos = m_file_cache.find(file_spec); 700 if (pos == m_file_cache.end()) 701 m_file_cache[file_spec] = file_sp; 702 else { 703 if (file_sp != pos->second) 704 m_file_cache[file_spec] = file_sp; 705 } 706 } 707 708 SourceManager::FileSP SourceManager::SourceFileCache::FindSourceFile( 709 const FileSpec &file_spec) const { 710 FileSP file_sp; 711 FileCache::const_iterator pos = m_file_cache.find(file_spec); 712 if (pos != m_file_cache.end()) 713 file_sp = pos->second; 714 return file_sp; 715 } 716