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