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Diffstat (limited to 'contrib/llvm-project/lldb/source/Core/SourceManager.cpp')
| -rw-r--r-- | contrib/llvm-project/lldb/source/Core/SourceManager.cpp | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Core/SourceManager.cpp b/contrib/llvm-project/lldb/source/Core/SourceManager.cpp new file mode 100644 index 000000000000..0d70c554e534 --- /dev/null +++ b/contrib/llvm-project/lldb/source/Core/SourceManager.cpp @@ -0,0 +1,833 @@ +//===-- SourceManager.cpp -------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "lldb/Core/SourceManager.h" + +#include "lldb/Core/Address.h" +#include "lldb/Core/AddressRange.h" +#include "lldb/Core/Debugger.h" +#include "lldb/Core/FormatEntity.h" +#include "lldb/Core/Highlighter.h" +#include "lldb/Core/Module.h" +#include "lldb/Core/ModuleList.h" +#include "lldb/Host/FileSystem.h" +#include "lldb/Symbol/CompileUnit.h" +#include "lldb/Symbol/Function.h" +#include "lldb/Symbol/LineEntry.h" +#include "lldb/Symbol/SymbolContext.h" +#include "lldb/Target/PathMappingList.h" +#include "lldb/Target/Process.h" +#include "lldb/Target/Target.h" +#include "lldb/Utility/AnsiTerminal.h" +#include "lldb/Utility/ConstString.h" +#include "lldb/Utility/DataBuffer.h" +#include "lldb/Utility/LLDBLog.h" +#include "lldb/Utility/Log.h" +#include "lldb/Utility/RegularExpression.h" +#include "lldb/Utility/Stream.h" +#include "lldb/lldb-enumerations.h" + +#include "llvm/ADT/Twine.h" + +#include <memory> +#include <optional> +#include <utility> + +#include <cassert> +#include <cstdio> + +namespace lldb_private { +class ExecutionContext; +} +namespace lldb_private { +class ValueObject; +} + +using namespace lldb; +using namespace lldb_private; + +static inline bool is_newline_char(char ch) { return ch == '\n' || ch == '\r'; } + +static void resolve_tilde(FileSpec &file_spec) { + if (!FileSystem::Instance().Exists(file_spec) && + file_spec.GetDirectory() && + file_spec.GetDirectory().GetCString()[0] == '~') { + FileSystem::Instance().Resolve(file_spec); + } +} + +// SourceManager constructor +SourceManager::SourceManager(const TargetSP &target_sp) + : m_last_line(0), m_last_count(0), m_default_set(false), + m_target_wp(target_sp), + m_debugger_wp(target_sp->GetDebugger().shared_from_this()) {} + +SourceManager::SourceManager(const DebuggerSP &debugger_sp) + : m_last_line(0), m_last_count(0), m_default_set(false), m_target_wp(), + m_debugger_wp(debugger_sp) {} + +// Destructor +SourceManager::~SourceManager() = default; + +SourceManager::FileSP SourceManager::GetFile(const FileSpec &file_spec) { + if (!file_spec) + return {}; + + Log *log = GetLog(LLDBLog::Source); + + DebuggerSP debugger_sp(m_debugger_wp.lock()); + TargetSP target_sp(m_target_wp.lock()); + + if (!debugger_sp || !debugger_sp->GetUseSourceCache()) { + LLDB_LOG(log, "Source file caching disabled: creating new source file: {0}", + file_spec); + if (target_sp) + return std::make_shared<File>(file_spec, target_sp); + return std::make_shared<File>(file_spec, debugger_sp); + } + + ProcessSP process_sp = target_sp ? target_sp->GetProcessSP() : ProcessSP(); + + // Check the process source cache first. This is the fast path which avoids + // touching the file system unless the path remapping has changed. + if (process_sp) { + if (FileSP file_sp = + process_sp->GetSourceFileCache().FindSourceFile(file_spec)) { + LLDB_LOG(log, "Found source file in the process cache: {0}", file_spec); + if (file_sp->PathRemappingIsStale()) { + LLDB_LOG(log, "Path remapping is stale: removing file from caches: {0}", + file_spec); + + // Remove the file from the debugger and process cache. Otherwise we'll + // hit the same issue again below when querying the debugger cache. + debugger_sp->GetSourceFileCache().RemoveSourceFile(file_sp); + process_sp->GetSourceFileCache().RemoveSourceFile(file_sp); + + file_sp.reset(); + } else { + return file_sp; + } + } + } + + // Cache miss in the process cache. Check the debugger source cache. + FileSP file_sp = debugger_sp->GetSourceFileCache().FindSourceFile(file_spec); + + // We found the file in the debugger cache. Check if anything invalidated our + // cache result. + if (file_sp) + LLDB_LOG(log, "Found source file in the debugger cache: {0}", file_spec); + + // Check if the path remapping has changed. + if (file_sp && file_sp->PathRemappingIsStale()) { + LLDB_LOG(log, "Path remapping is stale: {0}", file_spec); + file_sp.reset(); + } + + // Check if the modification time has changed. + if (file_sp && file_sp->ModificationTimeIsStale()) { + LLDB_LOG(log, "Modification time is stale: {0}", file_spec); + file_sp.reset(); + } + + // Check if the file exists on disk. + if (file_sp && !FileSystem::Instance().Exists(file_sp->GetFileSpec())) { + LLDB_LOG(log, "File doesn't exist on disk: {0}", file_spec); + file_sp.reset(); + } + + // If at this point we don't have a valid file, it means we either didn't find + // it in the debugger cache or something caused it to be invalidated. + if (!file_sp) { + LLDB_LOG(log, "Creating and caching new source file: {0}", file_spec); + + // (Re)create the file. + if (target_sp) + file_sp = std::make_shared<File>(file_spec, target_sp); + else + file_sp = std::make_shared<File>(file_spec, debugger_sp); + + // Add the file to the debugger and process cache. If the file was + // invalidated, this will overwrite it. + debugger_sp->GetSourceFileCache().AddSourceFile(file_spec, file_sp); + if (process_sp) + process_sp->GetSourceFileCache().AddSourceFile(file_spec, file_sp); + } + + return file_sp; +} + +static bool should_highlight_source(DebuggerSP debugger_sp) { + if (!debugger_sp) + return false; + + // We don't use ANSI stop column formatting if the debugger doesn't think it + // should be using color. + if (!debugger_sp->GetUseColor()) + return false; + + return debugger_sp->GetHighlightSource(); +} + +static bool should_show_stop_column_with_ansi(DebuggerSP debugger_sp) { + // We don't use ANSI stop column formatting if we can't lookup values from + // the debugger. + if (!debugger_sp) + return false; + + // We don't use ANSI stop column formatting if the debugger doesn't think it + // should be using color. + if (!debugger_sp->GetUseColor()) + return false; + + // We only use ANSI stop column formatting if we're either supposed to show + // ANSI where available (which we know we have when we get to this point), or + // if we're only supposed to use ANSI. + const auto value = debugger_sp->GetStopShowColumn(); + return ((value == eStopShowColumnAnsiOrCaret) || + (value == eStopShowColumnAnsi)); +} + +static bool should_show_stop_column_with_caret(DebuggerSP debugger_sp) { + // We don't use text-based stop column formatting if we can't lookup values + // from the debugger. + if (!debugger_sp) + return false; + + // If we're asked to show the first available of ANSI or caret, then we do + // show the caret when ANSI is not available. + const auto value = debugger_sp->GetStopShowColumn(); + if ((value == eStopShowColumnAnsiOrCaret) && !debugger_sp->GetUseColor()) + return true; + + // The only other time we use caret is if we're explicitly asked to show + // caret. + return value == eStopShowColumnCaret; +} + +static bool should_show_stop_line_with_ansi(DebuggerSP debugger_sp) { + return debugger_sp && debugger_sp->GetUseColor(); +} + +size_t SourceManager::DisplaySourceLinesWithLineNumbersUsingLastFile( + uint32_t start_line, uint32_t count, uint32_t curr_line, uint32_t column, + const char *current_line_cstr, Stream *s, + const SymbolContextList *bp_locs) { + if (count == 0) + return 0; + + Stream::ByteDelta delta(*s); + + if (start_line == 0) { + if (m_last_line != 0 && m_last_line != UINT32_MAX) + start_line = m_last_line + m_last_count; + else + start_line = 1; + } + + if (!m_default_set) { + FileSpec tmp_spec; + uint32_t tmp_line; + GetDefaultFileAndLine(tmp_spec, tmp_line); + } + + m_last_line = start_line; + m_last_count = count; + + if (FileSP last_file_sp = GetLastFile()) { + const uint32_t end_line = start_line + count - 1; + for (uint32_t line = start_line; line <= end_line; ++line) { + if (!last_file_sp->LineIsValid(line)) { + m_last_line = UINT32_MAX; + break; + } + + std::string prefix; + if (bp_locs) { + uint32_t bp_count = bp_locs->NumLineEntriesWithLine(line); + + if (bp_count > 0) + prefix = llvm::formatv("[{0}]", bp_count); + else + prefix = " "; + } + + char buffer[3]; + snprintf(buffer, sizeof(buffer), "%2.2s", + (line == curr_line) ? current_line_cstr : ""); + std::string current_line_highlight(buffer); + + auto debugger_sp = m_debugger_wp.lock(); + if (should_show_stop_line_with_ansi(debugger_sp)) { + current_line_highlight = ansi::FormatAnsiTerminalCodes( + (debugger_sp->GetStopShowLineMarkerAnsiPrefix() + + current_line_highlight + + debugger_sp->GetStopShowLineMarkerAnsiSuffix()) + .str()); + } + + s->Printf("%s%s %-4u\t", prefix.c_str(), current_line_highlight.c_str(), + line); + + // So far we treated column 0 as a special 'no column value', but + // DisplaySourceLines starts counting columns from 0 (and no column is + // expressed by passing an empty optional). + std::optional<size_t> columnToHighlight; + if (line == curr_line && column) + columnToHighlight = column - 1; + + size_t this_line_size = + last_file_sp->DisplaySourceLines(line, columnToHighlight, 0, 0, s); + if (column != 0 && line == curr_line && + should_show_stop_column_with_caret(debugger_sp)) { + // Display caret cursor. + std::string src_line; + last_file_sp->GetLine(line, src_line); + s->Printf(" \t"); + // Insert a space for every non-tab character in the source line. + for (size_t i = 0; i + 1 < column && i < src_line.length(); ++i) + s->PutChar(src_line[i] == '\t' ? '\t' : ' '); + // Now add the caret. + s->Printf("^\n"); + } + if (this_line_size == 0) { + m_last_line = UINT32_MAX; + break; + } + } + } + return *delta; +} + +size_t SourceManager::DisplaySourceLinesWithLineNumbers( + const FileSpec &file_spec, uint32_t line, uint32_t column, + uint32_t context_before, uint32_t context_after, + const char *current_line_cstr, Stream *s, + const SymbolContextList *bp_locs) { + FileSP file_sp(GetFile(file_spec)); + + uint32_t start_line; + uint32_t count = context_before + context_after + 1; + if (line > context_before) + start_line = line - context_before; + else + start_line = 1; + + FileSP last_file_sp(GetLastFile()); + if (last_file_sp.get() != file_sp.get()) { + if (line == 0) + m_last_line = 0; + m_last_file_spec = file_spec; + } + return DisplaySourceLinesWithLineNumbersUsingLastFile( + start_line, count, line, column, current_line_cstr, s, bp_locs); +} + +size_t SourceManager::DisplayMoreWithLineNumbers( + Stream *s, uint32_t count, bool reverse, const SymbolContextList *bp_locs) { + // If we get called before anybody has set a default file and line, then try + // to figure it out here. + FileSP last_file_sp(GetLastFile()); + const bool have_default_file_line = last_file_sp && m_last_line > 0; + if (!m_default_set) { + FileSpec tmp_spec; + uint32_t tmp_line; + GetDefaultFileAndLine(tmp_spec, tmp_line); + } + + if (last_file_sp) { + if (m_last_line == UINT32_MAX) + return 0; + + if (reverse && m_last_line == 1) + return 0; + + if (count > 0) + m_last_count = count; + else if (m_last_count == 0) + m_last_count = 10; + + if (m_last_line > 0) { + if (reverse) { + // If this is the first time we've done a reverse, then back up one + // more time so we end up showing the chunk before the last one we've + // shown: + if (m_last_line > m_last_count) + m_last_line -= m_last_count; + else + m_last_line = 1; + } else if (have_default_file_line) + m_last_line += m_last_count; + } else + m_last_line = 1; + + const uint32_t column = 0; + return DisplaySourceLinesWithLineNumbersUsingLastFile( + m_last_line, m_last_count, UINT32_MAX, column, "", s, bp_locs); + } + return 0; +} + +bool SourceManager::SetDefaultFileAndLine(const FileSpec &file_spec, + uint32_t line) { + m_default_set = true; + FileSP file_sp(GetFile(file_spec)); + + if (file_sp) { + m_last_line = line; + m_last_file_spec = file_spec; + return true; + } else { + return false; + } +} + +bool SourceManager::GetDefaultFileAndLine(FileSpec &file_spec, uint32_t &line) { + if (FileSP last_file_sp = GetLastFile()) { + file_spec = m_last_file_spec; + line = m_last_line; + return true; + } else if (!m_default_set) { + TargetSP target_sp(m_target_wp.lock()); + + if (target_sp) { + // If nobody has set the default file and line then try here. If there's + // no executable, then we will try again later when there is one. + // Otherwise, if we can't find it we won't look again, somebody will have + // to set it (for instance when we stop somewhere...) + Module *executable_ptr = target_sp->GetExecutableModulePointer(); + if (executable_ptr) { + SymbolContextList sc_list; + ConstString main_name("main"); + + ModuleFunctionSearchOptions function_options; + function_options.include_symbols = + false; // Force it to be a debug symbol. + function_options.include_inlines = true; + executable_ptr->FindFunctions(main_name, CompilerDeclContext(), + lldb::eFunctionNameTypeBase, + function_options, sc_list); + for (const SymbolContext &sc : sc_list) { + if (sc.function) { + lldb_private::LineEntry line_entry; + if (sc.function->GetAddressRange() + .GetBaseAddress() + .CalculateSymbolContextLineEntry(line_entry)) { + SetDefaultFileAndLine(line_entry.GetFile(), line_entry.line); + file_spec = m_last_file_spec; + line = m_last_line; + return true; + } + } + } + } + } + } + return false; +} + +void SourceManager::FindLinesMatchingRegex(FileSpec &file_spec, + RegularExpression ®ex, + uint32_t start_line, + uint32_t end_line, + std::vector<uint32_t> &match_lines) { + match_lines.clear(); + FileSP file_sp = GetFile(file_spec); + if (!file_sp) + return; + return file_sp->FindLinesMatchingRegex(regex, start_line, end_line, + match_lines); +} + +SourceManager::File::File(const FileSpec &file_spec, + lldb::DebuggerSP debugger_sp) + : m_file_spec_orig(file_spec), m_file_spec(), m_mod_time(), + m_debugger_wp(debugger_sp), m_target_wp(TargetSP()) { + CommonInitializer(file_spec, {}); +} + +SourceManager::File::File(const FileSpec &file_spec, TargetSP target_sp) + : m_file_spec_orig(file_spec), m_file_spec(), m_mod_time(), + m_debugger_wp(target_sp ? target_sp->GetDebugger().shared_from_this() + : DebuggerSP()), + m_target_wp(target_sp) { + CommonInitializer(file_spec, target_sp); +} + +void SourceManager::File::CommonInitializer(const FileSpec &file_spec, + TargetSP target_sp) { + // Set the file and update the modification time. + SetFileSpec(file_spec); + + // Always update the source map modification ID if we have a target. + if (target_sp) + m_source_map_mod_id = target_sp->GetSourcePathMap().GetModificationID(); + + // File doesn't exist. + if (m_mod_time == llvm::sys::TimePoint<>()) { + if (target_sp) { + // If this is just a file name, try finding it in the target. + if (!file_spec.GetDirectory() && file_spec.GetFilename()) { + bool check_inlines = false; + SymbolContextList sc_list; + size_t num_matches = + target_sp->GetImages().ResolveSymbolContextForFilePath( + file_spec.GetFilename().AsCString(), 0, check_inlines, + SymbolContextItem(eSymbolContextModule | + eSymbolContextCompUnit), + sc_list); + bool got_multiple = false; + if (num_matches != 0) { + if (num_matches > 1) { + CompileUnit *test_cu = nullptr; + for (const SymbolContext &sc : sc_list) { + if (sc.comp_unit) { + if (test_cu) { + if (test_cu != sc.comp_unit) + got_multiple = true; + break; + } else + test_cu = sc.comp_unit; + } + } + } + if (!got_multiple) { + SymbolContext sc; + sc_list.GetContextAtIndex(0, sc); + if (sc.comp_unit) + SetFileSpec(sc.comp_unit->GetPrimaryFile()); + } + } + } + + // Try remapping the file if it doesn't exist. + if (!FileSystem::Instance().Exists(m_file_spec)) { + // Check target specific source remappings (i.e., the + // target.source-map setting), then fall back to the module + // specific remapping (i.e., the .dSYM remapping dictionary). + auto remapped = target_sp->GetSourcePathMap().FindFile(m_file_spec); + if (!remapped) { + FileSpec new_spec; + if (target_sp->GetImages().FindSourceFile(m_file_spec, new_spec)) + remapped = new_spec; + } + if (remapped) + SetFileSpec(*remapped); + } + } + } + + // If the file exists, read in the data. + if (m_mod_time != llvm::sys::TimePoint<>()) + m_data_sp = FileSystem::Instance().CreateDataBuffer(m_file_spec); +} + +void SourceManager::File::SetFileSpec(FileSpec file_spec) { + resolve_tilde(file_spec); + m_file_spec = std::move(file_spec); + m_mod_time = FileSystem::Instance().GetModificationTime(m_file_spec); +} + +uint32_t SourceManager::File::GetLineOffset(uint32_t line) { + if (line == 0) + return UINT32_MAX; + + if (line == 1) + return 0; + + if (CalculateLineOffsets(line)) { + if (line < m_offsets.size()) + return m_offsets[line - 1]; // yes we want "line - 1" in the index + } + return UINT32_MAX; +} + +uint32_t SourceManager::File::GetNumLines() { + CalculateLineOffsets(); + return m_offsets.size(); +} + +const char *SourceManager::File::PeekLineData(uint32_t line) { + if (!LineIsValid(line)) + return nullptr; + + size_t line_offset = GetLineOffset(line); + if (line_offset < m_data_sp->GetByteSize()) + return (const char *)m_data_sp->GetBytes() + line_offset; + return nullptr; +} + +uint32_t SourceManager::File::GetLineLength(uint32_t line, + bool include_newline_chars) { + if (!LineIsValid(line)) + return false; + + size_t start_offset = GetLineOffset(line); + size_t end_offset = GetLineOffset(line + 1); + if (end_offset == UINT32_MAX) + end_offset = m_data_sp->GetByteSize(); + + if (end_offset > start_offset) { + uint32_t length = end_offset - start_offset; + if (!include_newline_chars) { + const char *line_start = + (const char *)m_data_sp->GetBytes() + start_offset; + while (length > 0) { + const char last_char = line_start[length - 1]; + if ((last_char == '\r') || (last_char == '\n')) + --length; + else + break; + } + } + return length; + } + return 0; +} + +bool SourceManager::File::LineIsValid(uint32_t line) { + if (line == 0) + return false; + + if (CalculateLineOffsets(line)) + return line < m_offsets.size(); + return false; +} + +bool SourceManager::File::ModificationTimeIsStale() const { + // TODO: use host API to sign up for file modifications to anything in our + // source cache and only update when we determine a file has been updated. + // For now we check each time we want to display info for the file. + auto curr_mod_time = FileSystem::Instance().GetModificationTime(m_file_spec); + return curr_mod_time != llvm::sys::TimePoint<>() && + m_mod_time != curr_mod_time; +} + +bool SourceManager::File::PathRemappingIsStale() const { + if (TargetSP target_sp = m_target_wp.lock()) + return GetSourceMapModificationID() != + target_sp->GetSourcePathMap().GetModificationID(); + return false; +} + +size_t SourceManager::File::DisplaySourceLines(uint32_t line, + std::optional<size_t> column, + uint32_t context_before, + uint32_t context_after, + Stream *s) { + // Nothing to write if there's no stream. + if (!s) + return 0; + + // Sanity check m_data_sp before proceeding. + if (!m_data_sp) + return 0; + + size_t bytes_written = s->GetWrittenBytes(); + + auto debugger_sp = m_debugger_wp.lock(); + + HighlightStyle style; + // Use the default Vim style if source highlighting is enabled. + if (should_highlight_source(debugger_sp)) + style = HighlightStyle::MakeVimStyle(); + + // If we should mark the stop column with color codes, then copy the prefix + // and suffix to our color style. + if (should_show_stop_column_with_ansi(debugger_sp)) + style.selected.Set(debugger_sp->GetStopShowColumnAnsiPrefix(), + debugger_sp->GetStopShowColumnAnsiSuffix()); + + HighlighterManager mgr; + std::string path = GetFileSpec().GetPath(/*denormalize*/ false); + // FIXME: Find a way to get the definitive language this file was written in + // and pass it to the highlighter. + const auto &h = mgr.getHighlighterFor(lldb::eLanguageTypeUnknown, path); + + const uint32_t start_line = + line <= context_before ? 1 : line - context_before; + const uint32_t start_line_offset = GetLineOffset(start_line); + if (start_line_offset != UINT32_MAX) { + const uint32_t end_line = line + context_after; + uint32_t end_line_offset = GetLineOffset(end_line + 1); + if (end_line_offset == UINT32_MAX) + end_line_offset = m_data_sp->GetByteSize(); + + assert(start_line_offset <= end_line_offset); + if (start_line_offset < end_line_offset) { + size_t count = end_line_offset - start_line_offset; + const uint8_t *cstr = m_data_sp->GetBytes() + start_line_offset; + + auto ref = llvm::StringRef(reinterpret_cast<const char *>(cstr), count); + + h.Highlight(style, ref, column, "", *s); + + // Ensure we get an end of line character one way or another. + if (!is_newline_char(ref.back())) + s->EOL(); + } + } + return s->GetWrittenBytes() - bytes_written; +} + +void SourceManager::File::FindLinesMatchingRegex( + RegularExpression ®ex, uint32_t start_line, uint32_t end_line, + std::vector<uint32_t> &match_lines) { + match_lines.clear(); + + if (!LineIsValid(start_line) || + (end_line != UINT32_MAX && !LineIsValid(end_line))) + return; + if (start_line > end_line) + return; + + for (uint32_t line_no = start_line; line_no < end_line; line_no++) { + std::string buffer; + if (!GetLine(line_no, buffer)) + break; + if (regex.Execute(buffer)) { + match_lines.push_back(line_no); + } + } +} + +bool lldb_private::operator==(const SourceManager::File &lhs, + const SourceManager::File &rhs) { + if (lhs.m_file_spec != rhs.m_file_spec) + return false; + return lhs.m_mod_time == rhs.m_mod_time; +} + +bool SourceManager::File::CalculateLineOffsets(uint32_t line) { + line = + UINT32_MAX; // TODO: take this line out when we support partial indexing + if (line == UINT32_MAX) { + // Already done? + if (!m_offsets.empty() && m_offsets[0] == UINT32_MAX) + return true; + + if (m_offsets.empty()) { + if (m_data_sp.get() == nullptr) + return false; + + const char *start = (const char *)m_data_sp->GetBytes(); + if (start) { + const char *end = start + m_data_sp->GetByteSize(); + + // Calculate all line offsets from scratch + + // Push a 1 at index zero to indicate the file has been completely + // indexed. + m_offsets.push_back(UINT32_MAX); + const char *s; + for (s = start; s < end; ++s) { + char curr_ch = *s; + if (is_newline_char(curr_ch)) { + if (s + 1 < end) { + char next_ch = s[1]; + if (is_newline_char(next_ch)) { + if (curr_ch != next_ch) + ++s; + } + } + m_offsets.push_back(s + 1 - start); + } + } + if (!m_offsets.empty()) { + if (m_offsets.back() < size_t(end - start)) + m_offsets.push_back(end - start); + } + return true; + } + } else { + // Some lines have been populated, start where we last left off + assert("Not implemented yet" && false); + } + + } else { + // Calculate all line offsets up to "line" + assert("Not implemented yet" && false); + } + return false; +} + +bool SourceManager::File::GetLine(uint32_t line_no, std::string &buffer) { + if (!LineIsValid(line_no)) + return false; + + size_t start_offset = GetLineOffset(line_no); + size_t end_offset = GetLineOffset(line_no + 1); + if (end_offset == UINT32_MAX) { + end_offset = m_data_sp->GetByteSize(); + } + buffer.assign((const char *)m_data_sp->GetBytes() + start_offset, + end_offset - start_offset); + + return true; +} + +void SourceManager::SourceFileCache::AddSourceFile(const FileSpec &file_spec, + FileSP file_sp) { + llvm::sys::ScopedWriter guard(m_mutex); + + assert(file_sp && "invalid FileSP"); + + AddSourceFileImpl(file_spec, file_sp); + const FileSpec &resolved_file_spec = file_sp->GetFileSpec(); + if (file_spec != resolved_file_spec) + AddSourceFileImpl(file_sp->GetFileSpec(), file_sp); +} + +void SourceManager::SourceFileCache::RemoveSourceFile(const FileSP &file_sp) { + llvm::sys::ScopedWriter guard(m_mutex); + + assert(file_sp && "invalid FileSP"); + + // Iterate over all the elements in the cache. + // This is expensive but a relatively uncommon operation. + auto it = m_file_cache.begin(); + while (it != m_file_cache.end()) { + if (it->second == file_sp) + it = m_file_cache.erase(it); + else + it++; + } +} + +void SourceManager::SourceFileCache::AddSourceFileImpl( + const FileSpec &file_spec, FileSP file_sp) { + FileCache::iterator pos = m_file_cache.find(file_spec); + if (pos == m_file_cache.end()) { + m_file_cache[file_spec] = file_sp; + } else { + if (file_sp != pos->second) + m_file_cache[file_spec] = file_sp; + } +} + +SourceManager::FileSP SourceManager::SourceFileCache::FindSourceFile( + const FileSpec &file_spec) const { + llvm::sys::ScopedReader guard(m_mutex); + + FileCache::const_iterator pos = m_file_cache.find(file_spec); + if (pos != m_file_cache.end()) + return pos->second; + return {}; +} + +void SourceManager::SourceFileCache::Dump(Stream &stream) const { + stream << "Modification time Lines Path\n"; + stream << "------------------- -------- --------------------------------\n"; + for (auto &entry : m_file_cache) { + if (!entry.second) + continue; + FileSP file = entry.second; + stream.Format("{0:%Y-%m-%d %H:%M:%S} {1,8:d} {2}\n", file->GetTimestamp(), + file->GetNumLines(), entry.first.GetPath()); + } +} |