1 //===-- SourceManager.cpp ---------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "lldb/Core/SourceManager.h" 11 12 // C Includes 13 // C++ Includes 14 // Other libraries and framework includes 15 // Project includes 16 #include "lldb/Core/DataBuffer.h" 17 #include "lldb/Core/Stream.h" 18 19 using namespace lldb_private; 20 21 static inline bool is_newline_char(char ch) 22 { 23 return ch == '\n' || ch == '\r'; 24 } 25 26 27 //---------------------------------------------------------------------- 28 // SourceManager constructor 29 //---------------------------------------------------------------------- 30 SourceManager::SourceManager() : 31 m_file_cache (), 32 m_last_file_sp (), 33 m_last_file_line (0), 34 m_last_file_context_before (0), 35 m_last_file_context_after (0) 36 { 37 } 38 39 //---------------------------------------------------------------------- 40 // Destructor 41 //---------------------------------------------------------------------- 42 SourceManager::~SourceManager() 43 { 44 } 45 46 size_t 47 SourceManager::DisplaySourceLines 48 ( 49 const FileSpec &file_spec, 50 uint32_t line, 51 uint32_t context_before, 52 uint32_t context_after, 53 Stream *s 54 ) 55 { 56 m_last_file_sp = GetFile (file_spec); 57 m_last_file_line = line + context_after + 1; 58 m_last_file_context_before = context_before; 59 m_last_file_context_after = context_after; 60 if (m_last_file_sp.get()) 61 return m_last_file_sp->DisplaySourceLines (line, context_before, context_after, s); 62 63 return 0; 64 } 65 66 SourceManager::FileSP 67 SourceManager::GetFile (const FileSpec &file_spec) 68 { 69 FileSP file_sp; 70 FileCache::iterator pos = m_file_cache.find(file_spec); 71 if (pos != m_file_cache.end()) 72 file_sp = pos->second; 73 else 74 { 75 file_sp.reset (new File (file_spec)); 76 m_file_cache[file_spec] = file_sp; 77 } 78 return file_sp; 79 } 80 81 size_t 82 SourceManager::DisplaySourceLinesWithLineNumbersUsingLastFile 83 ( 84 uint32_t line, 85 uint32_t context_before, 86 uint32_t context_after, 87 const char* current_line_cstr, 88 Stream *s 89 ) 90 { 91 if (line == 0) 92 { 93 if (m_last_file_line != 0 94 && m_last_file_line != UINT32_MAX) 95 line = m_last_file_line + context_before; 96 else 97 line = 1; 98 } 99 100 m_last_file_line = line + context_after + 1; 101 m_last_file_context_before = context_before; 102 m_last_file_context_after = context_after; 103 104 if (context_before == UINT32_MAX) 105 context_before = 0; 106 if (context_after == UINT32_MAX) 107 context_after = 10; 108 109 if (m_last_file_sp.get()) 110 { 111 const uint32_t start_line = line <= context_before ? 1 : line - context_before; 112 const uint32_t end_line = line + context_after; 113 uint32_t curr_line; 114 for (curr_line = start_line; curr_line <= end_line; ++curr_line) 115 { 116 if (!m_last_file_sp->LineIsValid (curr_line)) 117 { 118 m_last_file_line = UINT32_MAX; 119 break; 120 } 121 122 s->Printf("%4u %2.2s\t", curr_line, curr_line == line ? current_line_cstr : ""); 123 if (m_last_file_sp->DisplaySourceLines (curr_line, 0, 0, s) == 0) 124 { 125 m_last_file_line = UINT32_MAX; 126 break; 127 } 128 } 129 } 130 return 0; 131 } 132 133 size_t 134 SourceManager::DisplaySourceLinesWithLineNumbers 135 ( 136 const FileSpec &file_spec, 137 uint32_t line, 138 uint32_t context_before, 139 uint32_t context_after, 140 const char* current_line_cstr, 141 Stream *s 142 ) 143 { 144 bool same_as_previous = m_last_file_sp && m_last_file_sp->FileSpecMatches (file_spec); 145 146 if (!same_as_previous) 147 m_last_file_sp = GetFile (file_spec); 148 149 if (line == 0) 150 { 151 if (!same_as_previous) 152 m_last_file_line = 0; 153 } 154 155 return DisplaySourceLinesWithLineNumbersUsingLastFile (line, context_before, context_after, current_line_cstr, s); 156 } 157 158 size_t 159 SourceManager::DisplayMoreWithLineNumbers (Stream *s) 160 { 161 if (m_last_file_sp) 162 { 163 if (m_last_file_line == UINT32_MAX) 164 return 0; 165 DisplaySourceLinesWithLineNumbersUsingLastFile (0, m_last_file_context_before, m_last_file_context_after, "", s); 166 } 167 return 0; 168 } 169 170 171 172 SourceManager::File::File(const FileSpec &file_spec) : 173 m_file_spec(file_spec), 174 m_mod_time (m_file_spec.GetModificationTime()), 175 m_data_sp(file_spec.ReadFileContents ()), 176 m_offsets() 177 { 178 } 179 180 SourceManager::File::~File() 181 { 182 } 183 184 uint32_t 185 SourceManager::File::GetLineOffset (uint32_t line) 186 { 187 if (line == 0) 188 return UINT32_MAX; 189 190 if (line == 1) 191 return 0; 192 193 if (CalculateLineOffsets (line)) 194 { 195 if (line < m_offsets.size()) 196 return m_offsets[line - 1]; // yes we want "line - 1" in the index 197 } 198 return UINT32_MAX; 199 } 200 201 bool 202 SourceManager::File::LineIsValid (uint32_t line) 203 { 204 if (line == 0) 205 return false; 206 207 if (CalculateLineOffsets (line)) 208 return line < m_offsets.size(); 209 return false; 210 } 211 212 size_t 213 SourceManager::File::DisplaySourceLines (uint32_t line, uint32_t context_before, uint32_t context_after, Stream *s) 214 { 215 // TODO: use host API to sign up for file modifications to anything in our 216 // source cache and only update when we determine a file has been updated. 217 // For now we check each time we want to display info for the file. 218 TimeValue curr_mod_time (m_file_spec.GetModificationTime()); 219 if (m_mod_time != curr_mod_time) 220 { 221 m_mod_time = curr_mod_time; 222 m_data_sp = m_file_spec.ReadFileContents (); 223 m_offsets.clear(); 224 } 225 226 const uint32_t start_line = line <= context_before ? 1 : line - context_before; 227 const uint32_t start_line_offset = GetLineOffset (start_line); 228 if (start_line_offset != UINT32_MAX) 229 { 230 const uint32_t end_line = line + context_after; 231 uint32_t end_line_offset = GetLineOffset (end_line + 1); 232 if (end_line_offset == UINT32_MAX) 233 end_line_offset = m_data_sp->GetByteSize(); 234 235 assert (start_line_offset <= end_line_offset); 236 size_t bytes_written = 0; 237 if (start_line_offset < end_line_offset) 238 { 239 size_t count = end_line_offset - start_line_offset; 240 const uint8_t *cstr = m_data_sp->GetBytes() + start_line_offset; 241 bytes_written = s->Write(cstr, count); 242 if (!is_newline_char(cstr[count-1])) 243 bytes_written += s->EOL(); 244 } 245 return bytes_written; 246 } 247 return 0; 248 } 249 250 bool 251 SourceManager::File::FileSpecMatches (const FileSpec &file_spec) 252 { 253 return FileSpec::Compare (m_file_spec, file_spec, false) == 0; 254 } 255 256 257 bool 258 SourceManager::File::CalculateLineOffsets (uint32_t line) 259 { 260 line = UINT32_MAX; // TODO: take this line out when we support partial indexing 261 if (line == UINT32_MAX) 262 { 263 // Already done? 264 if (!m_offsets.empty() && m_offsets[0] == UINT32_MAX) 265 return true; 266 267 if (m_offsets.empty()) 268 { 269 if (m_data_sp.get() == NULL) 270 return false; 271 272 const char *start = (char *)m_data_sp->GetBytes(); 273 if (start) 274 { 275 const char *end = start + m_data_sp->GetByteSize(); 276 277 // Calculate all line offsets from scratch 278 279 // Push a 1 at index zero to indicate the file has been completely indexed. 280 m_offsets.push_back(UINT32_MAX); 281 register const char *s; 282 for (s = start; s < end; ++s) 283 { 284 register char curr_ch = *s; 285 if (is_newline_char (curr_ch)) 286 { 287 register char next_ch = s[1]; 288 if (is_newline_char (next_ch)) 289 { 290 if (curr_ch != next_ch) 291 ++s; 292 } 293 m_offsets.push_back(s + 1 - start); 294 } 295 } 296 if (!m_offsets.empty()) 297 { 298 if (m_offsets.back() < end - start) 299 m_offsets.push_back(end - start); 300 } 301 return true; 302 } 303 } 304 else 305 { 306 // Some lines have been populated, start where we last left off 307 assert(!"Not implemented yet"); 308 } 309 310 } 311 else 312 { 313 // Calculate all line offsets up to "line" 314 assert(!"Not implemented yet"); 315 } 316 return false; 317 } 318