1 //===- BitcodeAnalyzer.cpp - Internal BitcodeAnalyzer implementation ------===// 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 "llvm/Bitcode/BitcodeAnalyzer.h" 10 #include "llvm/Bitcode/BitcodeReader.h" 11 #include "llvm/Bitcode/LLVMBitCodes.h" 12 #include "llvm/Bitstream/BitCodes.h" 13 #include "llvm/Bitstream/BitstreamReader.h" 14 #include "llvm/Support/Format.h" 15 #include "llvm/Support/SHA1.h" 16 #include <optional> 17 18 using namespace llvm; 19 20 static Error reportError(StringRef Message) { 21 return createStringError(std::errc::illegal_byte_sequence, Message.data()); 22 } 23 24 /// Return a symbolic block name if known, otherwise return null. 25 static std::optional<const char *> 26 GetBlockName(unsigned BlockID, const BitstreamBlockInfo &BlockInfo, 27 CurStreamTypeType CurStreamType) { 28 // Standard blocks for all bitcode files. 29 if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) { 30 if (BlockID == bitc::BLOCKINFO_BLOCK_ID) 31 return "BLOCKINFO_BLOCK"; 32 return std::nullopt; 33 } 34 35 // Check to see if we have a blockinfo record for this block, with a name. 36 if (const BitstreamBlockInfo::BlockInfo *Info = 37 BlockInfo.getBlockInfo(BlockID)) { 38 if (!Info->Name.empty()) 39 return Info->Name.c_str(); 40 } 41 42 if (CurStreamType != LLVMIRBitstream) 43 return std::nullopt; 44 45 switch (BlockID) { 46 default: 47 return std::nullopt; 48 case bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID: 49 return "OPERAND_BUNDLE_TAGS_BLOCK"; 50 case bitc::MODULE_BLOCK_ID: 51 return "MODULE_BLOCK"; 52 case bitc::PARAMATTR_BLOCK_ID: 53 return "PARAMATTR_BLOCK"; 54 case bitc::PARAMATTR_GROUP_BLOCK_ID: 55 return "PARAMATTR_GROUP_BLOCK_ID"; 56 case bitc::TYPE_BLOCK_ID_NEW: 57 return "TYPE_BLOCK_ID"; 58 case bitc::CONSTANTS_BLOCK_ID: 59 return "CONSTANTS_BLOCK"; 60 case bitc::FUNCTION_BLOCK_ID: 61 return "FUNCTION_BLOCK"; 62 case bitc::IDENTIFICATION_BLOCK_ID: 63 return "IDENTIFICATION_BLOCK_ID"; 64 case bitc::VALUE_SYMTAB_BLOCK_ID: 65 return "VALUE_SYMTAB"; 66 case bitc::METADATA_BLOCK_ID: 67 return "METADATA_BLOCK"; 68 case bitc::METADATA_KIND_BLOCK_ID: 69 return "METADATA_KIND_BLOCK"; 70 case bitc::METADATA_ATTACHMENT_ID: 71 return "METADATA_ATTACHMENT_BLOCK"; 72 case bitc::USELIST_BLOCK_ID: 73 return "USELIST_BLOCK_ID"; 74 case bitc::GLOBALVAL_SUMMARY_BLOCK_ID: 75 return "GLOBALVAL_SUMMARY_BLOCK"; 76 case bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID: 77 return "FULL_LTO_GLOBALVAL_SUMMARY_BLOCK"; 78 case bitc::MODULE_STRTAB_BLOCK_ID: 79 return "MODULE_STRTAB_BLOCK"; 80 case bitc::STRTAB_BLOCK_ID: 81 return "STRTAB_BLOCK"; 82 case bitc::SYMTAB_BLOCK_ID: 83 return "SYMTAB_BLOCK"; 84 } 85 } 86 87 /// Return a symbolic code name if known, otherwise return null. 88 static std::optional<const char *> 89 GetCodeName(unsigned CodeID, unsigned BlockID, 90 const BitstreamBlockInfo &BlockInfo, 91 CurStreamTypeType CurStreamType) { 92 // Standard blocks for all bitcode files. 93 if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) { 94 if (BlockID == bitc::BLOCKINFO_BLOCK_ID) { 95 switch (CodeID) { 96 default: 97 return std::nullopt; 98 case bitc::BLOCKINFO_CODE_SETBID: 99 return "SETBID"; 100 case bitc::BLOCKINFO_CODE_BLOCKNAME: 101 return "BLOCKNAME"; 102 case bitc::BLOCKINFO_CODE_SETRECORDNAME: 103 return "SETRECORDNAME"; 104 } 105 } 106 return std::nullopt; 107 } 108 109 // Check to see if we have a blockinfo record for this record, with a name. 110 if (const BitstreamBlockInfo::BlockInfo *Info = 111 BlockInfo.getBlockInfo(BlockID)) { 112 for (const std::pair<unsigned, std::string> &RN : Info->RecordNames) 113 if (RN.first == CodeID) 114 return RN.second.c_str(); 115 } 116 117 if (CurStreamType != LLVMIRBitstream) 118 return std::nullopt; 119 120 #define STRINGIFY_CODE(PREFIX, CODE) \ 121 case bitc::PREFIX##_##CODE: \ 122 return #CODE; 123 switch (BlockID) { 124 default: 125 return std::nullopt; 126 case bitc::MODULE_BLOCK_ID: 127 switch (CodeID) { 128 default: 129 return std::nullopt; 130 STRINGIFY_CODE(MODULE_CODE, VERSION) 131 STRINGIFY_CODE(MODULE_CODE, TRIPLE) 132 STRINGIFY_CODE(MODULE_CODE, DATALAYOUT) 133 STRINGIFY_CODE(MODULE_CODE, ASM) 134 STRINGIFY_CODE(MODULE_CODE, SECTIONNAME) 135 STRINGIFY_CODE(MODULE_CODE, DEPLIB) // Deprecated, present in old bitcode 136 STRINGIFY_CODE(MODULE_CODE, GLOBALVAR) 137 STRINGIFY_CODE(MODULE_CODE, FUNCTION) 138 STRINGIFY_CODE(MODULE_CODE, ALIAS) 139 STRINGIFY_CODE(MODULE_CODE, GCNAME) 140 STRINGIFY_CODE(MODULE_CODE, COMDAT) 141 STRINGIFY_CODE(MODULE_CODE, VSTOFFSET) 142 STRINGIFY_CODE(MODULE_CODE, METADATA_VALUES_UNUSED) 143 STRINGIFY_CODE(MODULE_CODE, SOURCE_FILENAME) 144 STRINGIFY_CODE(MODULE_CODE, HASH) 145 } 146 case bitc::IDENTIFICATION_BLOCK_ID: 147 switch (CodeID) { 148 default: 149 return std::nullopt; 150 STRINGIFY_CODE(IDENTIFICATION_CODE, STRING) 151 STRINGIFY_CODE(IDENTIFICATION_CODE, EPOCH) 152 } 153 case bitc::PARAMATTR_BLOCK_ID: 154 switch (CodeID) { 155 default: 156 return std::nullopt; 157 // FIXME: Should these be different? 158 case bitc::PARAMATTR_CODE_ENTRY_OLD: 159 return "ENTRY"; 160 case bitc::PARAMATTR_CODE_ENTRY: 161 return "ENTRY"; 162 } 163 case bitc::PARAMATTR_GROUP_BLOCK_ID: 164 switch (CodeID) { 165 default: 166 return std::nullopt; 167 case bitc::PARAMATTR_GRP_CODE_ENTRY: 168 return "ENTRY"; 169 } 170 case bitc::TYPE_BLOCK_ID_NEW: 171 switch (CodeID) { 172 default: 173 return std::nullopt; 174 STRINGIFY_CODE(TYPE_CODE, NUMENTRY) 175 STRINGIFY_CODE(TYPE_CODE, VOID) 176 STRINGIFY_CODE(TYPE_CODE, FLOAT) 177 STRINGIFY_CODE(TYPE_CODE, DOUBLE) 178 STRINGIFY_CODE(TYPE_CODE, LABEL) 179 STRINGIFY_CODE(TYPE_CODE, OPAQUE) 180 STRINGIFY_CODE(TYPE_CODE, INTEGER) 181 STRINGIFY_CODE(TYPE_CODE, POINTER) 182 STRINGIFY_CODE(TYPE_CODE, HALF) 183 STRINGIFY_CODE(TYPE_CODE, ARRAY) 184 STRINGIFY_CODE(TYPE_CODE, VECTOR) 185 STRINGIFY_CODE(TYPE_CODE, X86_FP80) 186 STRINGIFY_CODE(TYPE_CODE, FP128) 187 STRINGIFY_CODE(TYPE_CODE, PPC_FP128) 188 STRINGIFY_CODE(TYPE_CODE, METADATA) 189 STRINGIFY_CODE(TYPE_CODE, X86_MMX) 190 STRINGIFY_CODE(TYPE_CODE, STRUCT_ANON) 191 STRINGIFY_CODE(TYPE_CODE, STRUCT_NAME) 192 STRINGIFY_CODE(TYPE_CODE, STRUCT_NAMED) 193 STRINGIFY_CODE(TYPE_CODE, FUNCTION) 194 STRINGIFY_CODE(TYPE_CODE, TOKEN) 195 STRINGIFY_CODE(TYPE_CODE, BFLOAT) 196 } 197 198 case bitc::CONSTANTS_BLOCK_ID: 199 switch (CodeID) { 200 default: 201 return std::nullopt; 202 STRINGIFY_CODE(CST_CODE, SETTYPE) 203 STRINGIFY_CODE(CST_CODE, NULL) 204 STRINGIFY_CODE(CST_CODE, UNDEF) 205 STRINGIFY_CODE(CST_CODE, INTEGER) 206 STRINGIFY_CODE(CST_CODE, WIDE_INTEGER) 207 STRINGIFY_CODE(CST_CODE, FLOAT) 208 STRINGIFY_CODE(CST_CODE, AGGREGATE) 209 STRINGIFY_CODE(CST_CODE, STRING) 210 STRINGIFY_CODE(CST_CODE, CSTRING) 211 STRINGIFY_CODE(CST_CODE, CE_BINOP) 212 STRINGIFY_CODE(CST_CODE, CE_CAST) 213 STRINGIFY_CODE(CST_CODE, CE_GEP) 214 STRINGIFY_CODE(CST_CODE, CE_INBOUNDS_GEP) 215 STRINGIFY_CODE(CST_CODE, CE_SELECT) 216 STRINGIFY_CODE(CST_CODE, CE_EXTRACTELT) 217 STRINGIFY_CODE(CST_CODE, CE_INSERTELT) 218 STRINGIFY_CODE(CST_CODE, CE_SHUFFLEVEC) 219 STRINGIFY_CODE(CST_CODE, CE_CMP) 220 STRINGIFY_CODE(CST_CODE, INLINEASM) 221 STRINGIFY_CODE(CST_CODE, CE_SHUFVEC_EX) 222 STRINGIFY_CODE(CST_CODE, CE_UNOP) 223 STRINGIFY_CODE(CST_CODE, DSO_LOCAL_EQUIVALENT) 224 STRINGIFY_CODE(CST_CODE, NO_CFI_VALUE) 225 STRINGIFY_CODE(CST_CODE, PTRAUTH) 226 case bitc::CST_CODE_BLOCKADDRESS: 227 return "CST_CODE_BLOCKADDRESS"; 228 STRINGIFY_CODE(CST_CODE, DATA) 229 } 230 case bitc::FUNCTION_BLOCK_ID: 231 switch (CodeID) { 232 default: 233 return std::nullopt; 234 STRINGIFY_CODE(FUNC_CODE, DECLAREBLOCKS) 235 STRINGIFY_CODE(FUNC_CODE, INST_BINOP) 236 STRINGIFY_CODE(FUNC_CODE, INST_CAST) 237 STRINGIFY_CODE(FUNC_CODE, INST_GEP_OLD) 238 STRINGIFY_CODE(FUNC_CODE, INST_INBOUNDS_GEP_OLD) 239 STRINGIFY_CODE(FUNC_CODE, INST_SELECT) 240 STRINGIFY_CODE(FUNC_CODE, INST_EXTRACTELT) 241 STRINGIFY_CODE(FUNC_CODE, INST_INSERTELT) 242 STRINGIFY_CODE(FUNC_CODE, INST_SHUFFLEVEC) 243 STRINGIFY_CODE(FUNC_CODE, INST_CMP) 244 STRINGIFY_CODE(FUNC_CODE, INST_RET) 245 STRINGIFY_CODE(FUNC_CODE, INST_BR) 246 STRINGIFY_CODE(FUNC_CODE, INST_SWITCH) 247 STRINGIFY_CODE(FUNC_CODE, INST_INVOKE) 248 STRINGIFY_CODE(FUNC_CODE, INST_UNOP) 249 STRINGIFY_CODE(FUNC_CODE, INST_UNREACHABLE) 250 STRINGIFY_CODE(FUNC_CODE, INST_CLEANUPRET) 251 STRINGIFY_CODE(FUNC_CODE, INST_CATCHRET) 252 STRINGIFY_CODE(FUNC_CODE, INST_CATCHPAD) 253 STRINGIFY_CODE(FUNC_CODE, INST_PHI) 254 STRINGIFY_CODE(FUNC_CODE, INST_ALLOCA) 255 STRINGIFY_CODE(FUNC_CODE, INST_LOAD) 256 STRINGIFY_CODE(FUNC_CODE, INST_VAARG) 257 STRINGIFY_CODE(FUNC_CODE, INST_STORE) 258 STRINGIFY_CODE(FUNC_CODE, INST_EXTRACTVAL) 259 STRINGIFY_CODE(FUNC_CODE, INST_INSERTVAL) 260 STRINGIFY_CODE(FUNC_CODE, INST_CMP2) 261 STRINGIFY_CODE(FUNC_CODE, INST_VSELECT) 262 STRINGIFY_CODE(FUNC_CODE, DEBUG_LOC_AGAIN) 263 STRINGIFY_CODE(FUNC_CODE, INST_CALL) 264 STRINGIFY_CODE(FUNC_CODE, DEBUG_LOC) 265 STRINGIFY_CODE(FUNC_CODE, INST_GEP) 266 STRINGIFY_CODE(FUNC_CODE, OPERAND_BUNDLE) 267 STRINGIFY_CODE(FUNC_CODE, INST_FENCE) 268 STRINGIFY_CODE(FUNC_CODE, INST_ATOMICRMW) 269 STRINGIFY_CODE(FUNC_CODE, INST_LOADATOMIC) 270 STRINGIFY_CODE(FUNC_CODE, INST_STOREATOMIC) 271 STRINGIFY_CODE(FUNC_CODE, INST_CMPXCHG) 272 STRINGIFY_CODE(FUNC_CODE, INST_CALLBR) 273 STRINGIFY_CODE(FUNC_CODE, BLOCKADDR_USERS) 274 STRINGIFY_CODE(FUNC_CODE, DEBUG_RECORD_DECLARE) 275 STRINGIFY_CODE(FUNC_CODE, DEBUG_RECORD_VALUE) 276 STRINGIFY_CODE(FUNC_CODE, DEBUG_RECORD_ASSIGN) 277 STRINGIFY_CODE(FUNC_CODE, DEBUG_RECORD_VALUE_SIMPLE) 278 STRINGIFY_CODE(FUNC_CODE, DEBUG_RECORD_LABEL) 279 } 280 case bitc::VALUE_SYMTAB_BLOCK_ID: 281 switch (CodeID) { 282 default: 283 return std::nullopt; 284 STRINGIFY_CODE(VST_CODE, ENTRY) 285 STRINGIFY_CODE(VST_CODE, BBENTRY) 286 STRINGIFY_CODE(VST_CODE, FNENTRY) 287 STRINGIFY_CODE(VST_CODE, COMBINED_ENTRY) 288 } 289 case bitc::MODULE_STRTAB_BLOCK_ID: 290 switch (CodeID) { 291 default: 292 return std::nullopt; 293 STRINGIFY_CODE(MST_CODE, ENTRY) 294 STRINGIFY_CODE(MST_CODE, HASH) 295 } 296 case bitc::GLOBALVAL_SUMMARY_BLOCK_ID: 297 case bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID: 298 switch (CodeID) { 299 default: 300 return std::nullopt; 301 STRINGIFY_CODE(FS, PERMODULE) 302 STRINGIFY_CODE(FS, PERMODULE_PROFILE) 303 STRINGIFY_CODE(FS, PERMODULE_RELBF) 304 STRINGIFY_CODE(FS, PERMODULE_GLOBALVAR_INIT_REFS) 305 STRINGIFY_CODE(FS, PERMODULE_VTABLE_GLOBALVAR_INIT_REFS) 306 STRINGIFY_CODE(FS, COMBINED) 307 STRINGIFY_CODE(FS, COMBINED_PROFILE) 308 STRINGIFY_CODE(FS, COMBINED_GLOBALVAR_INIT_REFS) 309 STRINGIFY_CODE(FS, ALIAS) 310 STRINGIFY_CODE(FS, COMBINED_ALIAS) 311 STRINGIFY_CODE(FS, COMBINED_ORIGINAL_NAME) 312 STRINGIFY_CODE(FS, VERSION) 313 STRINGIFY_CODE(FS, FLAGS) 314 STRINGIFY_CODE(FS, TYPE_TESTS) 315 STRINGIFY_CODE(FS, TYPE_TEST_ASSUME_VCALLS) 316 STRINGIFY_CODE(FS, TYPE_CHECKED_LOAD_VCALLS) 317 STRINGIFY_CODE(FS, TYPE_TEST_ASSUME_CONST_VCALL) 318 STRINGIFY_CODE(FS, TYPE_CHECKED_LOAD_CONST_VCALL) 319 STRINGIFY_CODE(FS, VALUE_GUID) 320 STRINGIFY_CODE(FS, CFI_FUNCTION_DEFS) 321 STRINGIFY_CODE(FS, CFI_FUNCTION_DECLS) 322 STRINGIFY_CODE(FS, TYPE_ID) 323 STRINGIFY_CODE(FS, TYPE_ID_METADATA) 324 STRINGIFY_CODE(FS, BLOCK_COUNT) 325 STRINGIFY_CODE(FS, PARAM_ACCESS) 326 STRINGIFY_CODE(FS, PERMODULE_CALLSITE_INFO) 327 STRINGIFY_CODE(FS, PERMODULE_ALLOC_INFO) 328 STRINGIFY_CODE(FS, COMBINED_CALLSITE_INFO) 329 STRINGIFY_CODE(FS, COMBINED_ALLOC_INFO) 330 STRINGIFY_CODE(FS, STACK_IDS) 331 } 332 case bitc::METADATA_ATTACHMENT_ID: 333 switch (CodeID) { 334 default: 335 return std::nullopt; 336 STRINGIFY_CODE(METADATA, ATTACHMENT) 337 } 338 case bitc::METADATA_BLOCK_ID: 339 switch (CodeID) { 340 default: 341 return std::nullopt; 342 STRINGIFY_CODE(METADATA, STRING_OLD) 343 STRINGIFY_CODE(METADATA, VALUE) 344 STRINGIFY_CODE(METADATA, NODE) 345 STRINGIFY_CODE(METADATA, NAME) 346 STRINGIFY_CODE(METADATA, DISTINCT_NODE) 347 STRINGIFY_CODE(METADATA, KIND) // Older bitcode has it in a MODULE_BLOCK 348 STRINGIFY_CODE(METADATA, LOCATION) 349 STRINGIFY_CODE(METADATA, OLD_NODE) 350 STRINGIFY_CODE(METADATA, OLD_FN_NODE) 351 STRINGIFY_CODE(METADATA, NAMED_NODE) 352 STRINGIFY_CODE(METADATA, GENERIC_DEBUG) 353 STRINGIFY_CODE(METADATA, SUBRANGE) 354 STRINGIFY_CODE(METADATA, ENUMERATOR) 355 STRINGIFY_CODE(METADATA, BASIC_TYPE) 356 STRINGIFY_CODE(METADATA, FILE) 357 STRINGIFY_CODE(METADATA, DERIVED_TYPE) 358 STRINGIFY_CODE(METADATA, COMPOSITE_TYPE) 359 STRINGIFY_CODE(METADATA, SUBROUTINE_TYPE) 360 STRINGIFY_CODE(METADATA, COMPILE_UNIT) 361 STRINGIFY_CODE(METADATA, SUBPROGRAM) 362 STRINGIFY_CODE(METADATA, LEXICAL_BLOCK) 363 STRINGIFY_CODE(METADATA, LEXICAL_BLOCK_FILE) 364 STRINGIFY_CODE(METADATA, NAMESPACE) 365 STRINGIFY_CODE(METADATA, TEMPLATE_TYPE) 366 STRINGIFY_CODE(METADATA, TEMPLATE_VALUE) 367 STRINGIFY_CODE(METADATA, GLOBAL_VAR) 368 STRINGIFY_CODE(METADATA, LOCAL_VAR) 369 STRINGIFY_CODE(METADATA, EXPRESSION) 370 STRINGIFY_CODE(METADATA, OBJC_PROPERTY) 371 STRINGIFY_CODE(METADATA, IMPORTED_ENTITY) 372 STRINGIFY_CODE(METADATA, MODULE) 373 STRINGIFY_CODE(METADATA, MACRO) 374 STRINGIFY_CODE(METADATA, MACRO_FILE) 375 STRINGIFY_CODE(METADATA, STRINGS) 376 STRINGIFY_CODE(METADATA, GLOBAL_DECL_ATTACHMENT) 377 STRINGIFY_CODE(METADATA, GLOBAL_VAR_EXPR) 378 STRINGIFY_CODE(METADATA, INDEX_OFFSET) 379 STRINGIFY_CODE(METADATA, INDEX) 380 STRINGIFY_CODE(METADATA, ARG_LIST) 381 } 382 case bitc::METADATA_KIND_BLOCK_ID: 383 switch (CodeID) { 384 default: 385 return std::nullopt; 386 STRINGIFY_CODE(METADATA, KIND) 387 } 388 case bitc::USELIST_BLOCK_ID: 389 switch (CodeID) { 390 default: 391 return std::nullopt; 392 case bitc::USELIST_CODE_DEFAULT: 393 return "USELIST_CODE_DEFAULT"; 394 case bitc::USELIST_CODE_BB: 395 return "USELIST_CODE_BB"; 396 } 397 398 case bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID: 399 switch (CodeID) { 400 default: 401 return std::nullopt; 402 case bitc::OPERAND_BUNDLE_TAG: 403 return "OPERAND_BUNDLE_TAG"; 404 } 405 case bitc::STRTAB_BLOCK_ID: 406 switch (CodeID) { 407 default: 408 return std::nullopt; 409 case bitc::STRTAB_BLOB: 410 return "BLOB"; 411 } 412 case bitc::SYMTAB_BLOCK_ID: 413 switch (CodeID) { 414 default: 415 return std::nullopt; 416 case bitc::SYMTAB_BLOB: 417 return "BLOB"; 418 } 419 } 420 #undef STRINGIFY_CODE 421 } 422 423 static void printSize(raw_ostream &OS, double Bits) { 424 OS << format("%.2f/%.2fB/%luW", Bits, Bits / 8, (unsigned long)(Bits / 32)); 425 } 426 static void printSize(raw_ostream &OS, uint64_t Bits) { 427 OS << format("%lub/%.2fB/%luW", (unsigned long)Bits, (double)Bits / 8, 428 (unsigned long)(Bits / 32)); 429 } 430 431 static Expected<CurStreamTypeType> ReadSignature(BitstreamCursor &Stream) { 432 auto tryRead = [&Stream](char &Dest, size_t size) -> Error { 433 if (Expected<SimpleBitstreamCursor::word_t> MaybeWord = Stream.Read(size)) 434 Dest = MaybeWord.get(); 435 else 436 return MaybeWord.takeError(); 437 return Error::success(); 438 }; 439 440 char Signature[6]; 441 if (Error Err = tryRead(Signature[0], 8)) 442 return std::move(Err); 443 if (Error Err = tryRead(Signature[1], 8)) 444 return std::move(Err); 445 446 // Autodetect the file contents, if it is one we know. 447 if (Signature[0] == 'C' && Signature[1] == 'P') { 448 if (Error Err = tryRead(Signature[2], 8)) 449 return std::move(Err); 450 if (Error Err = tryRead(Signature[3], 8)) 451 return std::move(Err); 452 if (Signature[2] == 'C' && Signature[3] == 'H') 453 return ClangSerializedASTBitstream; 454 } else if (Signature[0] == 'D' && Signature[1] == 'I') { 455 if (Error Err = tryRead(Signature[2], 8)) 456 return std::move(Err); 457 if (Error Err = tryRead(Signature[3], 8)) 458 return std::move(Err); 459 if (Signature[2] == 'A' && Signature[3] == 'G') 460 return ClangSerializedDiagnosticsBitstream; 461 } else if (Signature[0] == 'R' && Signature[1] == 'M') { 462 if (Error Err = tryRead(Signature[2], 8)) 463 return std::move(Err); 464 if (Error Err = tryRead(Signature[3], 8)) 465 return std::move(Err); 466 if (Signature[2] == 'R' && Signature[3] == 'K') 467 return LLVMBitstreamRemarks; 468 } else { 469 if (Error Err = tryRead(Signature[2], 4)) 470 return std::move(Err); 471 if (Error Err = tryRead(Signature[3], 4)) 472 return std::move(Err); 473 if (Error Err = tryRead(Signature[4], 4)) 474 return std::move(Err); 475 if (Error Err = tryRead(Signature[5], 4)) 476 return std::move(Err); 477 if (Signature[0] == 'B' && Signature[1] == 'C' && Signature[2] == 0x0 && 478 Signature[3] == 0xC && Signature[4] == 0xE && Signature[5] == 0xD) 479 return LLVMIRBitstream; 480 } 481 return UnknownBitstream; 482 } 483 484 static Expected<CurStreamTypeType> analyzeHeader(std::optional<BCDumpOptions> O, 485 BitstreamCursor &Stream) { 486 ArrayRef<uint8_t> Bytes = Stream.getBitcodeBytes(); 487 const unsigned char *BufPtr = (const unsigned char *)Bytes.data(); 488 const unsigned char *EndBufPtr = BufPtr + Bytes.size(); 489 490 // If we have a wrapper header, parse it and ignore the non-bc file 491 // contents. The magic number is 0x0B17C0DE stored in little endian. 492 if (isBitcodeWrapper(BufPtr, EndBufPtr)) { 493 if (Bytes.size() < BWH_HeaderSize) 494 return reportError("Invalid bitcode wrapper header"); 495 496 if (O) { 497 unsigned Magic = support::endian::read32le(&BufPtr[BWH_MagicField]); 498 unsigned Version = support::endian::read32le(&BufPtr[BWH_VersionField]); 499 unsigned Offset = support::endian::read32le(&BufPtr[BWH_OffsetField]); 500 unsigned Size = support::endian::read32le(&BufPtr[BWH_SizeField]); 501 unsigned CPUType = support::endian::read32le(&BufPtr[BWH_CPUTypeField]); 502 503 O->OS << "<BITCODE_WRAPPER_HEADER" 504 << " Magic=" << format_hex(Magic, 10) 505 << " Version=" << format_hex(Version, 10) 506 << " Offset=" << format_hex(Offset, 10) 507 << " Size=" << format_hex(Size, 10) 508 << " CPUType=" << format_hex(CPUType, 10) << "/>\n"; 509 } 510 511 if (SkipBitcodeWrapperHeader(BufPtr, EndBufPtr, true)) 512 return reportError("Invalid bitcode wrapper header"); 513 } 514 515 // Use the cursor modified by skipping the wrapper header. 516 Stream = BitstreamCursor(ArrayRef<uint8_t>(BufPtr, EndBufPtr)); 517 518 return ReadSignature(Stream); 519 } 520 521 static bool canDecodeBlob(unsigned Code, unsigned BlockID) { 522 return BlockID == bitc::METADATA_BLOCK_ID && Code == bitc::METADATA_STRINGS; 523 } 524 525 Error BitcodeAnalyzer::decodeMetadataStringsBlob(StringRef Indent, 526 ArrayRef<uint64_t> Record, 527 StringRef Blob, 528 raw_ostream &OS) { 529 if (Blob.empty()) 530 return reportError("Cannot decode empty blob."); 531 532 if (Record.size() != 2) 533 return reportError( 534 "Decoding metadata strings blob needs two record entries."); 535 536 unsigned NumStrings = Record[0]; 537 unsigned StringsOffset = Record[1]; 538 OS << " num-strings = " << NumStrings << " {\n"; 539 540 StringRef Lengths = Blob.slice(0, StringsOffset); 541 SimpleBitstreamCursor R(Lengths); 542 StringRef Strings = Blob.drop_front(StringsOffset); 543 do { 544 if (R.AtEndOfStream()) 545 return reportError("bad length"); 546 547 uint32_t Size; 548 if (Error E = R.ReadVBR(6).moveInto(Size)) 549 return E; 550 if (Strings.size() < Size) 551 return reportError("truncated chars"); 552 553 OS << Indent << " '"; 554 OS.write_escaped(Strings.slice(0, Size), /*hex=*/true); 555 OS << "'\n"; 556 Strings = Strings.drop_front(Size); 557 } while (--NumStrings); 558 559 OS << Indent << " }"; 560 return Error::success(); 561 } 562 563 BitcodeAnalyzer::BitcodeAnalyzer(StringRef Buffer, 564 std::optional<StringRef> BlockInfoBuffer) 565 : Stream(Buffer) { 566 if (BlockInfoBuffer) 567 BlockInfoStream.emplace(*BlockInfoBuffer); 568 } 569 570 Error BitcodeAnalyzer::analyze(std::optional<BCDumpOptions> O, 571 std::optional<StringRef> CheckHash) { 572 if (Error E = analyzeHeader(O, Stream).moveInto(CurStreamType)) 573 return E; 574 575 Stream.setBlockInfo(&BlockInfo); 576 577 // Read block info from BlockInfoStream, if specified. 578 // The block info must be a top-level block. 579 if (BlockInfoStream) { 580 BitstreamCursor BlockInfoCursor(*BlockInfoStream); 581 if (Error E = analyzeHeader(O, BlockInfoCursor).takeError()) 582 return E; 583 584 while (!BlockInfoCursor.AtEndOfStream()) { 585 Expected<unsigned> MaybeCode = BlockInfoCursor.ReadCode(); 586 if (!MaybeCode) 587 return MaybeCode.takeError(); 588 if (MaybeCode.get() != bitc::ENTER_SUBBLOCK) 589 return reportError("Invalid record at top-level in block info file"); 590 591 Expected<unsigned> MaybeBlockID = BlockInfoCursor.ReadSubBlockID(); 592 if (!MaybeBlockID) 593 return MaybeBlockID.takeError(); 594 if (MaybeBlockID.get() == bitc::BLOCKINFO_BLOCK_ID) { 595 std::optional<BitstreamBlockInfo> NewBlockInfo; 596 if (Error E = 597 BlockInfoCursor.ReadBlockInfoBlock(/*ReadBlockInfoNames=*/true) 598 .moveInto(NewBlockInfo)) 599 return E; 600 if (!NewBlockInfo) 601 return reportError("Malformed BlockInfoBlock in block info file"); 602 BlockInfo = std::move(*NewBlockInfo); 603 break; 604 } 605 606 if (Error Err = BlockInfoCursor.SkipBlock()) 607 return Err; 608 } 609 } 610 611 // Parse the top-level structure. We only allow blocks at the top-level. 612 while (!Stream.AtEndOfStream()) { 613 Expected<unsigned> MaybeCode = Stream.ReadCode(); 614 if (!MaybeCode) 615 return MaybeCode.takeError(); 616 if (MaybeCode.get() != bitc::ENTER_SUBBLOCK) 617 return reportError("Invalid record at top-level"); 618 619 Expected<unsigned> MaybeBlockID = Stream.ReadSubBlockID(); 620 if (!MaybeBlockID) 621 return MaybeBlockID.takeError(); 622 623 if (Error E = parseBlock(MaybeBlockID.get(), 0, O, CheckHash)) 624 return E; 625 ++NumTopBlocks; 626 } 627 628 return Error::success(); 629 } 630 631 void BitcodeAnalyzer::printStats(BCDumpOptions O, 632 std::optional<StringRef> Filename) { 633 uint64_t BufferSizeBits = Stream.getBitcodeBytes().size() * CHAR_BIT; 634 // Print a summary of the read file. 635 O.OS << "Summary "; 636 if (Filename) 637 O.OS << "of " << Filename->data() << ":\n"; 638 O.OS << " Total size: "; 639 printSize(O.OS, BufferSizeBits); 640 O.OS << "\n"; 641 O.OS << " Stream type: "; 642 switch (CurStreamType) { 643 case UnknownBitstream: 644 O.OS << "unknown\n"; 645 break; 646 case LLVMIRBitstream: 647 O.OS << "LLVM IR\n"; 648 break; 649 case ClangSerializedASTBitstream: 650 O.OS << "Clang Serialized AST\n"; 651 break; 652 case ClangSerializedDiagnosticsBitstream: 653 O.OS << "Clang Serialized Diagnostics\n"; 654 break; 655 case LLVMBitstreamRemarks: 656 O.OS << "LLVM Remarks\n"; 657 break; 658 } 659 O.OS << " # Toplevel Blocks: " << NumTopBlocks << "\n"; 660 O.OS << "\n"; 661 662 // Emit per-block stats. 663 O.OS << "Per-block Summary:\n"; 664 for (const auto &Stat : BlockIDStats) { 665 O.OS << " Block ID #" << Stat.first; 666 if (std::optional<const char *> BlockName = 667 GetBlockName(Stat.first, BlockInfo, CurStreamType)) 668 O.OS << " (" << *BlockName << ")"; 669 O.OS << ":\n"; 670 671 const PerBlockIDStats &Stats = Stat.second; 672 O.OS << " Num Instances: " << Stats.NumInstances << "\n"; 673 O.OS << " Total Size: "; 674 printSize(O.OS, Stats.NumBits); 675 O.OS << "\n"; 676 double pct = (Stats.NumBits * 100.0) / BufferSizeBits; 677 O.OS << " Percent of file: " << format("%2.4f%%", pct) << "\n"; 678 if (Stats.NumInstances > 1) { 679 O.OS << " Average Size: "; 680 printSize(O.OS, Stats.NumBits / (double)Stats.NumInstances); 681 O.OS << "\n"; 682 O.OS << " Tot/Avg SubBlocks: " << Stats.NumSubBlocks << "/" 683 << Stats.NumSubBlocks / (double)Stats.NumInstances << "\n"; 684 O.OS << " Tot/Avg Abbrevs: " << Stats.NumAbbrevs << "/" 685 << Stats.NumAbbrevs / (double)Stats.NumInstances << "\n"; 686 O.OS << " Tot/Avg Records: " << Stats.NumRecords << "/" 687 << Stats.NumRecords / (double)Stats.NumInstances << "\n"; 688 } else { 689 O.OS << " Num SubBlocks: " << Stats.NumSubBlocks << "\n"; 690 O.OS << " Num Abbrevs: " << Stats.NumAbbrevs << "\n"; 691 O.OS << " Num Records: " << Stats.NumRecords << "\n"; 692 } 693 if (Stats.NumRecords) { 694 double pct = (Stats.NumAbbreviatedRecords * 100.0) / Stats.NumRecords; 695 O.OS << " Percent Abbrevs: " << format("%2.4f%%", pct) << "\n"; 696 } 697 O.OS << "\n"; 698 699 // Print a histogram of the codes we see. 700 if (O.Histogram && !Stats.CodeFreq.empty()) { 701 std::vector<std::pair<unsigned, unsigned>> FreqPairs; // <freq,code> 702 for (unsigned i = 0, e = Stats.CodeFreq.size(); i != e; ++i) 703 if (unsigned Freq = Stats.CodeFreq[i].NumInstances) 704 FreqPairs.push_back(std::make_pair(Freq, i)); 705 llvm::stable_sort(FreqPairs); 706 std::reverse(FreqPairs.begin(), FreqPairs.end()); 707 708 O.OS << "\tRecord Histogram:\n"; 709 O.OS << "\t\t Count # Bits b/Rec % Abv Record Kind\n"; 710 for (const auto &FreqPair : FreqPairs) { 711 const PerRecordStats &RecStats = Stats.CodeFreq[FreqPair.second]; 712 713 O.OS << format("\t\t%7d %9lu", RecStats.NumInstances, 714 (unsigned long)RecStats.TotalBits); 715 716 if (RecStats.NumInstances > 1) 717 O.OS << format(" %9.1f", 718 (double)RecStats.TotalBits / RecStats.NumInstances); 719 else 720 O.OS << " "; 721 722 if (RecStats.NumAbbrev) 723 O.OS << format(" %7.2f", (double)RecStats.NumAbbrev / 724 RecStats.NumInstances * 100); 725 else 726 O.OS << " "; 727 728 O.OS << " "; 729 if (std::optional<const char *> CodeName = GetCodeName( 730 FreqPair.second, Stat.first, BlockInfo, CurStreamType)) 731 O.OS << *CodeName << "\n"; 732 else 733 O.OS << "UnknownCode" << FreqPair.second << "\n"; 734 } 735 O.OS << "\n"; 736 } 737 } 738 } 739 740 Error BitcodeAnalyzer::parseBlock(unsigned BlockID, unsigned IndentLevel, 741 std::optional<BCDumpOptions> O, 742 std::optional<StringRef> CheckHash) { 743 std::string Indent(IndentLevel * 2, ' '); 744 uint64_t BlockBitStart = Stream.GetCurrentBitNo(); 745 746 // Get the statistics for this BlockID. 747 PerBlockIDStats &BlockStats = BlockIDStats[BlockID]; 748 749 BlockStats.NumInstances++; 750 751 // BLOCKINFO is a special part of the stream. 752 bool DumpRecords = O.has_value(); 753 if (BlockID == bitc::BLOCKINFO_BLOCK_ID) { 754 if (O && !O->DumpBlockinfo) 755 O->OS << Indent << "<BLOCKINFO_BLOCK/>\n"; 756 std::optional<BitstreamBlockInfo> NewBlockInfo; 757 if (Error E = Stream.ReadBlockInfoBlock(/*ReadBlockInfoNames=*/true) 758 .moveInto(NewBlockInfo)) 759 return E; 760 if (!NewBlockInfo) 761 return reportError("Malformed BlockInfoBlock"); 762 BlockInfo = std::move(*NewBlockInfo); 763 if (Error Err = Stream.JumpToBit(BlockBitStart)) 764 return Err; 765 // It's not really interesting to dump the contents of the blockinfo 766 // block, so only do it if the user explicitly requests it. 767 DumpRecords = O && O->DumpBlockinfo; 768 } 769 770 unsigned NumWords = 0; 771 if (Error Err = Stream.EnterSubBlock(BlockID, &NumWords)) 772 return Err; 773 774 // Keep it for later, when we see a MODULE_HASH record 775 uint64_t BlockEntryPos = Stream.getCurrentByteNo(); 776 777 std::optional<const char *> BlockName; 778 if (DumpRecords) { 779 O->OS << Indent << "<"; 780 if ((BlockName = GetBlockName(BlockID, BlockInfo, CurStreamType))) 781 O->OS << *BlockName; 782 else 783 O->OS << "UnknownBlock" << BlockID; 784 785 if (!O->Symbolic && BlockName) 786 O->OS << " BlockID=" << BlockID; 787 788 O->OS << " NumWords=" << NumWords 789 << " BlockCodeSize=" << Stream.getAbbrevIDWidth() << ">\n"; 790 } 791 792 SmallVector<uint64_t, 64> Record; 793 794 // Keep the offset to the metadata index if seen. 795 uint64_t MetadataIndexOffset = 0; 796 797 // Read all the records for this block. 798 while (true) { 799 if (Stream.AtEndOfStream()) 800 return reportError("Premature end of bitstream"); 801 802 uint64_t RecordStartBit = Stream.GetCurrentBitNo(); 803 804 BitstreamEntry Entry; 805 if (Error E = Stream.advance(BitstreamCursor::AF_DontAutoprocessAbbrevs) 806 .moveInto(Entry)) 807 return E; 808 809 switch (Entry.Kind) { 810 case BitstreamEntry::Error: 811 return reportError("malformed bitcode file"); 812 case BitstreamEntry::EndBlock: { 813 uint64_t BlockBitEnd = Stream.GetCurrentBitNo(); 814 BlockStats.NumBits += BlockBitEnd - BlockBitStart; 815 if (DumpRecords) { 816 O->OS << Indent << "</"; 817 if (BlockName) 818 O->OS << *BlockName << ">\n"; 819 else 820 O->OS << "UnknownBlock" << BlockID << ">\n"; 821 } 822 return Error::success(); 823 } 824 825 case BitstreamEntry::SubBlock: { 826 uint64_t SubBlockBitStart = Stream.GetCurrentBitNo(); 827 if (Error E = parseBlock(Entry.ID, IndentLevel + 1, O, CheckHash)) 828 return E; 829 ++BlockStats.NumSubBlocks; 830 uint64_t SubBlockBitEnd = Stream.GetCurrentBitNo(); 831 832 // Don't include subblock sizes in the size of this block. 833 BlockBitStart += SubBlockBitEnd - SubBlockBitStart; 834 continue; 835 } 836 case BitstreamEntry::Record: 837 // The interesting case. 838 break; 839 } 840 841 if (Entry.ID == bitc::DEFINE_ABBREV) { 842 if (Error Err = Stream.ReadAbbrevRecord()) 843 return Err; 844 ++BlockStats.NumAbbrevs; 845 continue; 846 } 847 848 Record.clear(); 849 850 ++BlockStats.NumRecords; 851 852 StringRef Blob; 853 uint64_t CurrentRecordPos = Stream.GetCurrentBitNo(); 854 unsigned Code; 855 if (Error E = Stream.readRecord(Entry.ID, Record, &Blob).moveInto(Code)) 856 return E; 857 858 // Increment the # occurrences of this code. 859 if (BlockStats.CodeFreq.size() <= Code) 860 BlockStats.CodeFreq.resize(Code + 1); 861 BlockStats.CodeFreq[Code].NumInstances++; 862 BlockStats.CodeFreq[Code].TotalBits += 863 Stream.GetCurrentBitNo() - RecordStartBit; 864 if (Entry.ID != bitc::UNABBREV_RECORD) { 865 BlockStats.CodeFreq[Code].NumAbbrev++; 866 ++BlockStats.NumAbbreviatedRecords; 867 } 868 869 if (DumpRecords) { 870 O->OS << Indent << " <"; 871 std::optional<const char *> CodeName = 872 GetCodeName(Code, BlockID, BlockInfo, CurStreamType); 873 if (CodeName) 874 O->OS << *CodeName; 875 else 876 O->OS << "UnknownCode" << Code; 877 if (!O->Symbolic && CodeName) 878 O->OS << " codeid=" << Code; 879 const BitCodeAbbrev *Abbv = nullptr; 880 if (Entry.ID != bitc::UNABBREV_RECORD) { 881 Expected<const BitCodeAbbrev *> MaybeAbbv = Stream.getAbbrev(Entry.ID); 882 if (!MaybeAbbv) 883 return MaybeAbbv.takeError(); 884 Abbv = MaybeAbbv.get(); 885 O->OS << " abbrevid=" << Entry.ID; 886 } 887 888 for (unsigned i = 0, e = Record.size(); i != e; ++i) 889 O->OS << " op" << i << "=" << (int64_t)Record[i]; 890 891 // If we found a metadata index, let's verify that we had an offset 892 // before and validate its forward reference offset was correct! 893 if (BlockID == bitc::METADATA_BLOCK_ID) { 894 if (Code == bitc::METADATA_INDEX_OFFSET) { 895 if (Record.size() != 2) 896 O->OS << "(Invalid record)"; 897 else { 898 auto Offset = Record[0] + (Record[1] << 32); 899 MetadataIndexOffset = Stream.GetCurrentBitNo() + Offset; 900 } 901 } 902 if (Code == bitc::METADATA_INDEX) { 903 O->OS << " (offset "; 904 if (MetadataIndexOffset == RecordStartBit) 905 O->OS << "match)"; 906 else 907 O->OS << "mismatch: " << MetadataIndexOffset << " vs " 908 << RecordStartBit << ")"; 909 } 910 } 911 912 // If we found a module hash, let's verify that it matches! 913 if (BlockID == bitc::MODULE_BLOCK_ID && Code == bitc::MODULE_CODE_HASH && 914 CheckHash) { 915 if (Record.size() != 5) 916 O->OS << " (invalid)"; 917 else { 918 // Recompute the hash and compare it to the one in the bitcode 919 SHA1 Hasher; 920 std::array<uint8_t, 20> Hash; 921 Hasher.update(*CheckHash); 922 { 923 int BlockSize = (CurrentRecordPos / 8) - BlockEntryPos; 924 auto Ptr = Stream.getPointerToByte(BlockEntryPos, BlockSize); 925 Hasher.update(ArrayRef<uint8_t>(Ptr, BlockSize)); 926 Hash = Hasher.result(); 927 } 928 std::array<uint8_t, 20> RecordedHash; 929 int Pos = 0; 930 for (auto &Val : Record) { 931 assert(!(Val >> 32) && "Unexpected high bits set"); 932 support::endian::write32be(&RecordedHash[Pos], Val); 933 Pos += 4; 934 } 935 if (Hash == RecordedHash) 936 O->OS << " (match)"; 937 else 938 O->OS << " (!mismatch!)"; 939 } 940 } 941 942 O->OS << "/>"; 943 944 if (Abbv) { 945 for (unsigned i = 1, e = Abbv->getNumOperandInfos(); i != e; ++i) { 946 const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i); 947 if (!Op.isEncoding() || Op.getEncoding() != BitCodeAbbrevOp::Array) 948 continue; 949 assert(i + 2 == e && "Array op not second to last"); 950 std::string Str; 951 bool ArrayIsPrintable = true; 952 for (unsigned j = i - 1, je = Record.size(); j != je; ++j) { 953 if (!isPrint(static_cast<unsigned char>(Record[j]))) { 954 ArrayIsPrintable = false; 955 break; 956 } 957 Str += (char)Record[j]; 958 } 959 if (ArrayIsPrintable) 960 O->OS << " record string = '" << Str << "'"; 961 break; 962 } 963 } 964 965 if (Blob.data()) { 966 if (canDecodeBlob(Code, BlockID)) { 967 if (Error E = decodeMetadataStringsBlob(Indent, Record, Blob, O->OS)) 968 return E; 969 } else { 970 O->OS << " blob data = "; 971 if (O->ShowBinaryBlobs) { 972 O->OS << "'"; 973 O->OS.write_escaped(Blob, /*hex=*/true) << "'"; 974 } else { 975 bool BlobIsPrintable = true; 976 for (char C : Blob) 977 if (!isPrint(static_cast<unsigned char>(C))) { 978 BlobIsPrintable = false; 979 break; 980 } 981 982 if (BlobIsPrintable) 983 O->OS << "'" << Blob << "'"; 984 else 985 O->OS << "unprintable, " << Blob.size() << " bytes."; 986 } 987 } 988 } 989 990 O->OS << "\n"; 991 } 992 993 // Make sure that we can skip the current record. 994 if (Error Err = Stream.JumpToBit(CurrentRecordPos)) 995 return Err; 996 if (Expected<unsigned> Skipped = Stream.skipRecord(Entry.ID)) 997 ; // Do nothing. 998 else 999 return Skipped.takeError(); 1000 } 1001 } 1002 1003