1 //===-- llvm-size.cpp - Print the size of each object section -------------===// 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 // This program is a utility that works like traditional Unix "size", 11 // that is, it prints out the size of each section, and the total size of all 12 // sections. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #include "llvm/ADT/APInt.h" 17 #include "llvm/Object/Archive.h" 18 #include "llvm/Object/ObjectFile.h" 19 #include "llvm/Support/Casting.h" 20 #include "llvm/Support/CommandLine.h" 21 #include "llvm/Support/FileSystem.h" 22 #include "llvm/Support/Format.h" 23 #include "llvm/Support/ManagedStatic.h" 24 #include "llvm/Support/MemoryBuffer.h" 25 #include "llvm/Support/PrettyStackTrace.h" 26 #include "llvm/Support/Signals.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include "llvm/Support/system_error.h" 29 #include <algorithm> 30 #include <string> 31 using namespace llvm; 32 using namespace object; 33 34 enum OutputFormatTy {berkeley, sysv}; 35 static cl::opt<OutputFormatTy> 36 OutputFormat("format", 37 cl::desc("Specify output format"), 38 cl::values(clEnumVal(sysv, "System V format"), 39 clEnumVal(berkeley, "Berkeley format"), 40 clEnumValEnd), 41 cl::init(berkeley)); 42 43 static cl::opt<OutputFormatTy> 44 OutputFormatShort(cl::desc("Specify output format"), 45 cl::values(clEnumValN(sysv, "A", "System V format"), 46 clEnumValN(berkeley, "B", "Berkeley format"), 47 clEnumValEnd), 48 cl::init(berkeley)); 49 50 enum RadixTy {octal = 8, decimal = 10, hexadecimal = 16}; 51 static cl::opt<unsigned int> 52 Radix("-radix", 53 cl::desc("Print size in radix. Only 8, 10, and 16 are valid"), 54 cl::init(decimal)); 55 56 static cl::opt<RadixTy> 57 RadixShort(cl::desc("Print size in radix:"), 58 cl::values(clEnumValN(octal, "o", "Print size in octal"), 59 clEnumValN(decimal, "d", "Print size in decimal"), 60 clEnumValN(hexadecimal, "x", "Print size in hexadecimal"), 61 clEnumValEnd), 62 cl::init(decimal)); 63 64 static cl::list<std::string> 65 InputFilenames(cl::Positional, cl::desc("<input files>"), 66 cl::ZeroOrMore); 67 68 static std::string ToolName; 69 70 /// @brief If ec is not success, print the error and return true. 71 static bool error(error_code ec) { 72 if (!ec) return false; 73 74 outs() << ToolName << ": error reading file: " << ec.message() << ".\n"; 75 outs().flush(); 76 return true; 77 } 78 79 /// @brief Get the length of the string that represents @p num in Radix 80 /// including the leading 0x or 0 for hexadecimal and octal respectively. 81 static size_t getNumLengthAsString(uint64_t num) { 82 APInt conv(64, num); 83 SmallString<32> result; 84 conv.toString(result, Radix, false, true); 85 return result.size(); 86 } 87 88 /// @brief Print the size of each section in @p o. 89 /// 90 /// The format used is determined by @c OutputFormat and @c Radix. 91 static void PrintObjectSectionSizes(ObjectFile *o) { 92 uint64_t total = 0; 93 std::string fmtbuf; 94 raw_string_ostream fmt(fmtbuf); 95 96 const char *radix_fmt = 0; 97 switch (Radix) { 98 case octal: 99 radix_fmt = PRIo64; 100 break; 101 case decimal: 102 radix_fmt = PRIu64; 103 break; 104 case hexadecimal: 105 radix_fmt = PRIx64; 106 break; 107 } 108 if (OutputFormat == sysv) { 109 // Run two passes over all sections. The first gets the lengths needed for 110 // formatting the output. The second actually does the output. 111 std::size_t max_name_len = strlen("section"); 112 std::size_t max_size_len = strlen("size"); 113 std::size_t max_addr_len = strlen("addr"); 114 error_code ec; 115 for (section_iterator i = o->begin_sections(), 116 e = o->end_sections(); i != e; 117 i.increment(ec)) { 118 if (error(ec)) 119 return; 120 uint64_t size = 0; 121 if (error(i->getSize(size))) 122 return; 123 total += size; 124 125 StringRef name; 126 uint64_t addr = 0; 127 if (error(i->getName(name))) return; 128 if (error(i->getAddress(addr))) return; 129 max_name_len = std::max(max_name_len, name.size()); 130 max_size_len = std::max(max_size_len, getNumLengthAsString(size)); 131 max_addr_len = std::max(max_addr_len, getNumLengthAsString(addr)); 132 } 133 134 // Add extra padding. 135 max_name_len += 2; 136 max_size_len += 2; 137 max_addr_len += 2; 138 139 // Setup header format. 140 fmt << "%-" << max_name_len << "s " 141 << "%" << max_size_len << "s " 142 << "%" << max_addr_len << "s\n"; 143 144 // Print header 145 outs() << format(fmt.str().c_str(), 146 static_cast<const char*>("section"), 147 static_cast<const char*>("size"), 148 static_cast<const char*>("addr")); 149 fmtbuf.clear(); 150 151 // Setup per section format. 152 fmt << "%-" << max_name_len << "s " 153 << "%#" << max_size_len << radix_fmt << " " 154 << "%#" << max_addr_len << radix_fmt << "\n"; 155 156 // Print each section. 157 for (section_iterator i = o->begin_sections(), 158 e = o->end_sections(); i != e; 159 i.increment(ec)) { 160 if (error(ec)) 161 return; 162 163 StringRef name; 164 uint64_t size = 0; 165 uint64_t addr = 0; 166 if (error(i->getName(name))) return; 167 if (error(i->getSize(size))) return; 168 if (error(i->getAddress(addr))) return; 169 std::string namestr = name; 170 171 outs() << format(fmt.str().c_str(), 172 namestr.c_str(), 173 size, 174 addr); 175 } 176 177 // Print total. 178 fmtbuf.clear(); 179 fmt << "%-" << max_name_len << "s " 180 << "%#" << max_size_len << radix_fmt << "\n"; 181 outs() << format(fmt.str().c_str(), 182 static_cast<const char*>("Total"), 183 total); 184 } else { 185 // The Berkeley format does not display individual section sizes. It 186 // displays the cumulative size for each section type. 187 uint64_t total_text = 0; 188 uint64_t total_data = 0; 189 uint64_t total_bss = 0; 190 191 // Make one pass over the section table to calculate sizes. 192 error_code ec; 193 for (section_iterator i = o->begin_sections(), 194 e = o->end_sections(); i != e; 195 i.increment(ec)) { 196 if (error(ec)) 197 return; 198 199 uint64_t size = 0; 200 bool isText = false; 201 bool isData = false; 202 bool isBSS = false; 203 if (error(i->getSize(size))) return; 204 if (error(i->isText(isText))) return; 205 if (error(i->isData(isData))) return; 206 if (error(i->isBSS(isBSS))) return; 207 if (isText) 208 total_text += size; 209 else if (isData) 210 total_data += size; 211 else if (isBSS) 212 total_bss += size; 213 } 214 215 total = total_text + total_data + total_bss; 216 217 // Print result. 218 fmt << "%#7" << radix_fmt << " " 219 << "%#7" << radix_fmt << " " 220 << "%#7" << radix_fmt << " "; 221 outs() << format(fmt.str().c_str(), 222 total_text, 223 total_data, 224 total_bss); 225 fmtbuf.clear(); 226 fmt << "%7" << (Radix == octal ? PRIo64 : PRIu64) << " " 227 << "%7" PRIx64 " "; 228 outs() << format(fmt.str().c_str(), 229 total, 230 total); 231 } 232 } 233 234 /// @brief Print the section sizes for @p file. If @p file is an archive, print 235 /// the section sizes for each archive member. 236 static void PrintFileSectionSizes(StringRef file) { 237 // If file is not stdin, check that it exists. 238 if (file != "-") { 239 bool exists; 240 if (sys::fs::exists(file, exists) || !exists) { 241 errs() << ToolName << ": '" << file << "': " << "No such file\n"; 242 return; 243 } 244 } 245 246 // Attempt to open the binary. 247 OwningPtr<Binary> binary; 248 if (error_code ec = createBinary(file, binary)) { 249 errs() << ToolName << ": " << file << ": " << ec.message() << ".\n"; 250 return; 251 } 252 253 if (Archive *a = dyn_cast<Archive>(binary.get())) { 254 // This is an archive. Iterate over each member and display its sizes. 255 for (object::Archive::child_iterator i = a->begin_children(), 256 e = a->end_children(); i != e; ++i) { 257 OwningPtr<Binary> child; 258 if (error_code ec = i->getAsBinary(child)) { 259 errs() << ToolName << ": " << file << ": " << ec.message() << ".\n"; 260 continue; 261 } 262 if (ObjectFile *o = dyn_cast<ObjectFile>(child.get())) { 263 if (OutputFormat == sysv) 264 outs() << o->getFileName() << " (ex " << a->getFileName() 265 << "):\n"; 266 PrintObjectSectionSizes(o); 267 if (OutputFormat == berkeley) 268 outs() << o->getFileName() << " (ex " << a->getFileName() << ")\n"; 269 } 270 } 271 } else if (ObjectFile *o = dyn_cast<ObjectFile>(binary.get())) { 272 if (OutputFormat == sysv) 273 outs() << o->getFileName() << " :\n"; 274 PrintObjectSectionSizes(o); 275 if (OutputFormat == berkeley) 276 outs() << o->getFileName() << "\n"; 277 } else { 278 errs() << ToolName << ": " << file << ": " << "Unrecognized file type.\n"; 279 } 280 // System V adds an extra newline at the end of each file. 281 if (OutputFormat == sysv) 282 outs() << "\n"; 283 } 284 285 int main(int argc, char **argv) { 286 // Print a stack trace if we signal out. 287 sys::PrintStackTraceOnErrorSignal(); 288 PrettyStackTraceProgram X(argc, argv); 289 290 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 291 cl::ParseCommandLineOptions(argc, argv, "llvm object size dumper\n"); 292 293 ToolName = argv[0]; 294 if (OutputFormatShort.getNumOccurrences()) 295 OutputFormat = OutputFormatShort; 296 if (RadixShort.getNumOccurrences()) 297 Radix = RadixShort; 298 299 if (InputFilenames.size() == 0) 300 InputFilenames.push_back("a.out"); 301 302 if (OutputFormat == berkeley) 303 outs() << " text data bss " 304 << (Radix == octal ? "oct" : "dec") 305 << " hex filename\n"; 306 307 std::for_each(InputFilenames.begin(), InputFilenames.end(), 308 PrintFileSectionSizes); 309 310 return 0; 311 } 312
