1 //===- MILexer.cpp - Machine instructions lexer 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 // This file implements the lexing of machine instructions. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "MILexer.h" 14 #include "llvm/ADT/None.h" 15 #include "llvm/ADT/StringExtras.h" 16 #include "llvm/ADT/StringSwitch.h" 17 #include "llvm/ADT/Twine.h" 18 #include <algorithm> 19 #include <cassert> 20 #include <cctype> 21 #include <string> 22 23 using namespace llvm; 24 25 namespace { 26 27 using ErrorCallbackType = 28 function_ref<void(StringRef::iterator Loc, const Twine &)>; 29 30 /// This class provides a way to iterate and get characters from the source 31 /// string. 32 class Cursor { 33 const char *Ptr = nullptr; 34 const char *End = nullptr; 35 36 public: 37 Cursor(NoneType) {} 38 39 explicit Cursor(StringRef Str) { 40 Ptr = Str.data(); 41 End = Ptr + Str.size(); 42 } 43 44 bool isEOF() const { return Ptr == End; } 45 46 char peek(int I = 0) const { return End - Ptr <= I ? 0 : Ptr[I]; } 47 48 void advance(unsigned I = 1) { Ptr += I; } 49 50 StringRef remaining() const { return StringRef(Ptr, End - Ptr); } 51 52 StringRef upto(Cursor C) const { 53 assert(C.Ptr >= Ptr && C.Ptr <= End); 54 return StringRef(Ptr, C.Ptr - Ptr); 55 } 56 57 StringRef::iterator location() const { return Ptr; } 58 59 operator bool() const { return Ptr != nullptr; } 60 }; 61 62 } // end anonymous namespace 63 64 MIToken &MIToken::reset(TokenKind Kind, StringRef Range) { 65 this->Kind = Kind; 66 this->Range = Range; 67 return *this; 68 } 69 70 MIToken &MIToken::setStringValue(StringRef StrVal) { 71 StringValue = StrVal; 72 return *this; 73 } 74 75 MIToken &MIToken::setOwnedStringValue(std::string StrVal) { 76 StringValueStorage = std::move(StrVal); 77 StringValue = StringValueStorage; 78 return *this; 79 } 80 81 MIToken &MIToken::setIntegerValue(APSInt IntVal) { 82 this->IntVal = std::move(IntVal); 83 return *this; 84 } 85 86 /// Skip the leading whitespace characters and return the updated cursor. 87 static Cursor skipWhitespace(Cursor C) { 88 while (isblank(C.peek())) 89 C.advance(); 90 return C; 91 } 92 93 static bool isNewlineChar(char C) { return C == '\n' || C == '\r'; } 94 95 /// Skip a line comment and return the updated cursor. 96 static Cursor skipComment(Cursor C) { 97 if (C.peek() != ';') 98 return C; 99 while (!isNewlineChar(C.peek()) && !C.isEOF()) 100 C.advance(); 101 return C; 102 } 103 104 /// Machine operands can have comments, enclosed between /* and */. 105 /// This eats up all tokens, including /* and */. 106 static Cursor skipMachineOperandComment(Cursor C) { 107 if (C.peek() != '/' || C.peek(1) != '*') 108 return C; 109 110 while (C.peek() != '*' || C.peek(1) != '/') 111 C.advance(); 112 113 C.advance(); 114 C.advance(); 115 return C; 116 } 117 118 /// Return true if the given character satisfies the following regular 119 /// expression: [-a-zA-Z$._0-9] 120 static bool isIdentifierChar(char C) { 121 return isalpha(C) || isdigit(C) || C == '_' || C == '-' || C == '.' || 122 C == '$'; 123 } 124 125 /// Unescapes the given string value. 126 /// 127 /// Expects the string value to be quoted. 128 static std::string unescapeQuotedString(StringRef Value) { 129 assert(Value.front() == '"' && Value.back() == '"'); 130 Cursor C = Cursor(Value.substr(1, Value.size() - 2)); 131 132 std::string Str; 133 Str.reserve(C.remaining().size()); 134 while (!C.isEOF()) { 135 char Char = C.peek(); 136 if (Char == '\\') { 137 if (C.peek(1) == '\\') { 138 // Two '\' become one 139 Str += '\\'; 140 C.advance(2); 141 continue; 142 } 143 if (isxdigit(C.peek(1)) && isxdigit(C.peek(2))) { 144 Str += hexDigitValue(C.peek(1)) * 16 + hexDigitValue(C.peek(2)); 145 C.advance(3); 146 continue; 147 } 148 } 149 Str += Char; 150 C.advance(); 151 } 152 return Str; 153 } 154 155 /// Lex a string constant using the following regular expression: \"[^\"]*\" 156 static Cursor lexStringConstant(Cursor C, ErrorCallbackType ErrorCallback) { 157 assert(C.peek() == '"'); 158 for (C.advance(); C.peek() != '"'; C.advance()) { 159 if (C.isEOF() || isNewlineChar(C.peek())) { 160 ErrorCallback( 161 C.location(), 162 "end of machine instruction reached before the closing '\"'"); 163 return None; 164 } 165 } 166 C.advance(); 167 return C; 168 } 169 170 static Cursor lexName(Cursor C, MIToken &Token, MIToken::TokenKind Type, 171 unsigned PrefixLength, ErrorCallbackType ErrorCallback) { 172 auto Range = C; 173 C.advance(PrefixLength); 174 if (C.peek() == '"') { 175 if (Cursor R = lexStringConstant(C, ErrorCallback)) { 176 StringRef String = Range.upto(R); 177 Token.reset(Type, String) 178 .setOwnedStringValue( 179 unescapeQuotedString(String.drop_front(PrefixLength))); 180 return R; 181 } 182 Token.reset(MIToken::Error, Range.remaining()); 183 return Range; 184 } 185 while (isIdentifierChar(C.peek())) 186 C.advance(); 187 Token.reset(Type, Range.upto(C)) 188 .setStringValue(Range.upto(C).drop_front(PrefixLength)); 189 return C; 190 } 191 192 static MIToken::TokenKind getIdentifierKind(StringRef Identifier) { 193 return StringSwitch<MIToken::TokenKind>(Identifier) 194 .Case("_", MIToken::underscore) 195 .Case("implicit", MIToken::kw_implicit) 196 .Case("implicit-def", MIToken::kw_implicit_define) 197 .Case("def", MIToken::kw_def) 198 .Case("dead", MIToken::kw_dead) 199 .Case("killed", MIToken::kw_killed) 200 .Case("undef", MIToken::kw_undef) 201 .Case("internal", MIToken::kw_internal) 202 .Case("early-clobber", MIToken::kw_early_clobber) 203 .Case("debug-use", MIToken::kw_debug_use) 204 .Case("renamable", MIToken::kw_renamable) 205 .Case("tied-def", MIToken::kw_tied_def) 206 .Case("frame-setup", MIToken::kw_frame_setup) 207 .Case("frame-destroy", MIToken::kw_frame_destroy) 208 .Case("nnan", MIToken::kw_nnan) 209 .Case("ninf", MIToken::kw_ninf) 210 .Case("nsz", MIToken::kw_nsz) 211 .Case("arcp", MIToken::kw_arcp) 212 .Case("contract", MIToken::kw_contract) 213 .Case("afn", MIToken::kw_afn) 214 .Case("reassoc", MIToken::kw_reassoc) 215 .Case("nuw", MIToken::kw_nuw) 216 .Case("nsw", MIToken::kw_nsw) 217 .Case("exact", MIToken::kw_exact) 218 .Case("nofpexcept", MIToken::kw_nofpexcept) 219 .Case("debug-location", MIToken::kw_debug_location) 220 .Case("debug-instr-number", MIToken::kw_debug_instr_number) 221 .Case("same_value", MIToken::kw_cfi_same_value) 222 .Case("offset", MIToken::kw_cfi_offset) 223 .Case("rel_offset", MIToken::kw_cfi_rel_offset) 224 .Case("def_cfa_register", MIToken::kw_cfi_def_cfa_register) 225 .Case("def_cfa_offset", MIToken::kw_cfi_def_cfa_offset) 226 .Case("adjust_cfa_offset", MIToken::kw_cfi_adjust_cfa_offset) 227 .Case("escape", MIToken::kw_cfi_escape) 228 .Case("def_cfa", MIToken::kw_cfi_def_cfa) 229 .Case("remember_state", MIToken::kw_cfi_remember_state) 230 .Case("restore", MIToken::kw_cfi_restore) 231 .Case("restore_state", MIToken::kw_cfi_restore_state) 232 .Case("undefined", MIToken::kw_cfi_undefined) 233 .Case("register", MIToken::kw_cfi_register) 234 .Case("window_save", MIToken::kw_cfi_window_save) 235 .Case("negate_ra_sign_state", 236 MIToken::kw_cfi_aarch64_negate_ra_sign_state) 237 .Case("blockaddress", MIToken::kw_blockaddress) 238 .Case("intrinsic", MIToken::kw_intrinsic) 239 .Case("target-index", MIToken::kw_target_index) 240 .Case("half", MIToken::kw_half) 241 .Case("float", MIToken::kw_float) 242 .Case("double", MIToken::kw_double) 243 .Case("x86_fp80", MIToken::kw_x86_fp80) 244 .Case("fp128", MIToken::kw_fp128) 245 .Case("ppc_fp128", MIToken::kw_ppc_fp128) 246 .Case("target-flags", MIToken::kw_target_flags) 247 .Case("volatile", MIToken::kw_volatile) 248 .Case("non-temporal", MIToken::kw_non_temporal) 249 .Case("dereferenceable", MIToken::kw_dereferenceable) 250 .Case("invariant", MIToken::kw_invariant) 251 .Case("align", MIToken::kw_align) 252 .Case("basealign", MIToken::kw_align) 253 .Case("addrspace", MIToken::kw_addrspace) 254 .Case("stack", MIToken::kw_stack) 255 .Case("got", MIToken::kw_got) 256 .Case("jump-table", MIToken::kw_jump_table) 257 .Case("constant-pool", MIToken::kw_constant_pool) 258 .Case("call-entry", MIToken::kw_call_entry) 259 .Case("custom", MIToken::kw_custom) 260 .Case("liveout", MIToken::kw_liveout) 261 .Case("address-taken", MIToken::kw_address_taken) 262 .Case("landing-pad", MIToken::kw_landing_pad) 263 .Case("ehfunclet-entry", MIToken::kw_ehfunclet_entry) 264 .Case("liveins", MIToken::kw_liveins) 265 .Case("successors", MIToken::kw_successors) 266 .Case("floatpred", MIToken::kw_floatpred) 267 .Case("intpred", MIToken::kw_intpred) 268 .Case("shufflemask", MIToken::kw_shufflemask) 269 .Case("pre-instr-symbol", MIToken::kw_pre_instr_symbol) 270 .Case("post-instr-symbol", MIToken::kw_post_instr_symbol) 271 .Case("heap-alloc-marker", MIToken::kw_heap_alloc_marker) 272 .Case("bbsections", MIToken::kw_bbsections) 273 .Case("unknown-size", MIToken::kw_unknown_size) 274 .Case("unknown-address", MIToken::kw_unknown_address) 275 .Default(MIToken::Identifier); 276 } 277 278 static Cursor maybeLexIdentifier(Cursor C, MIToken &Token) { 279 if (!isalpha(C.peek()) && C.peek() != '_') 280 return None; 281 auto Range = C; 282 while (isIdentifierChar(C.peek())) 283 C.advance(); 284 auto Identifier = Range.upto(C); 285 Token.reset(getIdentifierKind(Identifier), Identifier) 286 .setStringValue(Identifier); 287 return C; 288 } 289 290 static Cursor maybeLexMachineBasicBlock(Cursor C, MIToken &Token, 291 ErrorCallbackType ErrorCallback) { 292 bool IsReference = C.remaining().startswith("%bb."); 293 if (!IsReference && !C.remaining().startswith("bb.")) 294 return None; 295 auto Range = C; 296 unsigned PrefixLength = IsReference ? 4 : 3; 297 C.advance(PrefixLength); // Skip '%bb.' or 'bb.' 298 if (!isdigit(C.peek())) { 299 Token.reset(MIToken::Error, C.remaining()); 300 ErrorCallback(C.location(), "expected a number after '%bb.'"); 301 return C; 302 } 303 auto NumberRange = C; 304 while (isdigit(C.peek())) 305 C.advance(); 306 StringRef Number = NumberRange.upto(C); 307 unsigned StringOffset = PrefixLength + Number.size(); // Drop '%bb.<id>' 308 // TODO: The format bb.<id>.<irname> is supported only when it's not a 309 // reference. Once we deprecate the format where the irname shows up, we 310 // should only lex forward if it is a reference. 311 if (C.peek() == '.') { 312 C.advance(); // Skip '.' 313 ++StringOffset; 314 while (isIdentifierChar(C.peek())) 315 C.advance(); 316 } 317 Token.reset(IsReference ? MIToken::MachineBasicBlock 318 : MIToken::MachineBasicBlockLabel, 319 Range.upto(C)) 320 .setIntegerValue(APSInt(Number)) 321 .setStringValue(Range.upto(C).drop_front(StringOffset)); 322 return C; 323 } 324 325 static Cursor maybeLexIndex(Cursor C, MIToken &Token, StringRef Rule, 326 MIToken::TokenKind Kind) { 327 if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size()))) 328 return None; 329 auto Range = C; 330 C.advance(Rule.size()); 331 auto NumberRange = C; 332 while (isdigit(C.peek())) 333 C.advance(); 334 Token.reset(Kind, Range.upto(C)).setIntegerValue(APSInt(NumberRange.upto(C))); 335 return C; 336 } 337 338 static Cursor maybeLexIndexAndName(Cursor C, MIToken &Token, StringRef Rule, 339 MIToken::TokenKind Kind) { 340 if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size()))) 341 return None; 342 auto Range = C; 343 C.advance(Rule.size()); 344 auto NumberRange = C; 345 while (isdigit(C.peek())) 346 C.advance(); 347 StringRef Number = NumberRange.upto(C); 348 unsigned StringOffset = Rule.size() + Number.size(); 349 if (C.peek() == '.') { 350 C.advance(); 351 ++StringOffset; 352 while (isIdentifierChar(C.peek())) 353 C.advance(); 354 } 355 Token.reset(Kind, Range.upto(C)) 356 .setIntegerValue(APSInt(Number)) 357 .setStringValue(Range.upto(C).drop_front(StringOffset)); 358 return C; 359 } 360 361 static Cursor maybeLexJumpTableIndex(Cursor C, MIToken &Token) { 362 return maybeLexIndex(C, Token, "%jump-table.", MIToken::JumpTableIndex); 363 } 364 365 static Cursor maybeLexStackObject(Cursor C, MIToken &Token) { 366 return maybeLexIndexAndName(C, Token, "%stack.", MIToken::StackObject); 367 } 368 369 static Cursor maybeLexFixedStackObject(Cursor C, MIToken &Token) { 370 return maybeLexIndex(C, Token, "%fixed-stack.", MIToken::FixedStackObject); 371 } 372 373 static Cursor maybeLexConstantPoolItem(Cursor C, MIToken &Token) { 374 return maybeLexIndex(C, Token, "%const.", MIToken::ConstantPoolItem); 375 } 376 377 static Cursor maybeLexSubRegisterIndex(Cursor C, MIToken &Token, 378 ErrorCallbackType ErrorCallback) { 379 const StringRef Rule = "%subreg."; 380 if (!C.remaining().startswith(Rule)) 381 return None; 382 return lexName(C, Token, MIToken::SubRegisterIndex, Rule.size(), 383 ErrorCallback); 384 } 385 386 static Cursor maybeLexIRBlock(Cursor C, MIToken &Token, 387 ErrorCallbackType ErrorCallback) { 388 const StringRef Rule = "%ir-block."; 389 if (!C.remaining().startswith(Rule)) 390 return None; 391 if (isdigit(C.peek(Rule.size()))) 392 return maybeLexIndex(C, Token, Rule, MIToken::IRBlock); 393 return lexName(C, Token, MIToken::NamedIRBlock, Rule.size(), ErrorCallback); 394 } 395 396 static Cursor maybeLexIRValue(Cursor C, MIToken &Token, 397 ErrorCallbackType ErrorCallback) { 398 const StringRef Rule = "%ir."; 399 if (!C.remaining().startswith(Rule)) 400 return None; 401 if (isdigit(C.peek(Rule.size()))) 402 return maybeLexIndex(C, Token, Rule, MIToken::IRValue); 403 return lexName(C, Token, MIToken::NamedIRValue, Rule.size(), ErrorCallback); 404 } 405 406 static Cursor maybeLexStringConstant(Cursor C, MIToken &Token, 407 ErrorCallbackType ErrorCallback) { 408 if (C.peek() != '"') 409 return None; 410 return lexName(C, Token, MIToken::StringConstant, /*PrefixLength=*/0, 411 ErrorCallback); 412 } 413 414 static Cursor lexVirtualRegister(Cursor C, MIToken &Token) { 415 auto Range = C; 416 C.advance(); // Skip '%' 417 auto NumberRange = C; 418 while (isdigit(C.peek())) 419 C.advance(); 420 Token.reset(MIToken::VirtualRegister, Range.upto(C)) 421 .setIntegerValue(APSInt(NumberRange.upto(C))); 422 return C; 423 } 424 425 /// Returns true for a character allowed in a register name. 426 static bool isRegisterChar(char C) { 427 return isIdentifierChar(C) && C != '.'; 428 } 429 430 static Cursor lexNamedVirtualRegister(Cursor C, MIToken &Token) { 431 Cursor Range = C; 432 C.advance(); // Skip '%' 433 while (isRegisterChar(C.peek())) 434 C.advance(); 435 Token.reset(MIToken::NamedVirtualRegister, Range.upto(C)) 436 .setStringValue(Range.upto(C).drop_front(1)); // Drop the '%' 437 return C; 438 } 439 440 static Cursor maybeLexRegister(Cursor C, MIToken &Token, 441 ErrorCallbackType ErrorCallback) { 442 if (C.peek() != '%' && C.peek() != '$') 443 return None; 444 445 if (C.peek() == '%') { 446 if (isdigit(C.peek(1))) 447 return lexVirtualRegister(C, Token); 448 449 if (isRegisterChar(C.peek(1))) 450 return lexNamedVirtualRegister(C, Token); 451 452 return None; 453 } 454 455 assert(C.peek() == '$'); 456 auto Range = C; 457 C.advance(); // Skip '$' 458 while (isRegisterChar(C.peek())) 459 C.advance(); 460 Token.reset(MIToken::NamedRegister, Range.upto(C)) 461 .setStringValue(Range.upto(C).drop_front(1)); // Drop the '$' 462 return C; 463 } 464 465 static Cursor maybeLexGlobalValue(Cursor C, MIToken &Token, 466 ErrorCallbackType ErrorCallback) { 467 if (C.peek() != '@') 468 return None; 469 if (!isdigit(C.peek(1))) 470 return lexName(C, Token, MIToken::NamedGlobalValue, /*PrefixLength=*/1, 471 ErrorCallback); 472 auto Range = C; 473 C.advance(1); // Skip the '@' 474 auto NumberRange = C; 475 while (isdigit(C.peek())) 476 C.advance(); 477 Token.reset(MIToken::GlobalValue, Range.upto(C)) 478 .setIntegerValue(APSInt(NumberRange.upto(C))); 479 return C; 480 } 481 482 static Cursor maybeLexExternalSymbol(Cursor C, MIToken &Token, 483 ErrorCallbackType ErrorCallback) { 484 if (C.peek() != '&') 485 return None; 486 return lexName(C, Token, MIToken::ExternalSymbol, /*PrefixLength=*/1, 487 ErrorCallback); 488 } 489 490 static Cursor maybeLexMCSymbol(Cursor C, MIToken &Token, 491 ErrorCallbackType ErrorCallback) { 492 const StringRef Rule = "<mcsymbol "; 493 if (!C.remaining().startswith(Rule)) 494 return None; 495 auto Start = C; 496 C.advance(Rule.size()); 497 498 // Try a simple unquoted name. 499 if (C.peek() != '"') { 500 while (isIdentifierChar(C.peek())) 501 C.advance(); 502 StringRef String = Start.upto(C).drop_front(Rule.size()); 503 if (C.peek() != '>') { 504 ErrorCallback(C.location(), 505 "expected the '<mcsymbol ...' to be closed by a '>'"); 506 Token.reset(MIToken::Error, Start.remaining()); 507 return Start; 508 } 509 C.advance(); 510 511 Token.reset(MIToken::MCSymbol, Start.upto(C)).setStringValue(String); 512 return C; 513 } 514 515 // Otherwise lex out a quoted name. 516 Cursor R = lexStringConstant(C, ErrorCallback); 517 if (!R) { 518 ErrorCallback(C.location(), 519 "unable to parse quoted string from opening quote"); 520 Token.reset(MIToken::Error, Start.remaining()); 521 return Start; 522 } 523 StringRef String = Start.upto(R).drop_front(Rule.size()); 524 if (R.peek() != '>') { 525 ErrorCallback(R.location(), 526 "expected the '<mcsymbol ...' to be closed by a '>'"); 527 Token.reset(MIToken::Error, Start.remaining()); 528 return Start; 529 } 530 R.advance(); 531 532 Token.reset(MIToken::MCSymbol, Start.upto(R)) 533 .setOwnedStringValue(unescapeQuotedString(String)); 534 return R; 535 } 536 537 static bool isValidHexFloatingPointPrefix(char C) { 538 return C == 'H' || C == 'K' || C == 'L' || C == 'M' || C == 'R'; 539 } 540 541 static Cursor lexFloatingPointLiteral(Cursor Range, Cursor C, MIToken &Token) { 542 C.advance(); 543 // Skip over [0-9]*([eE][-+]?[0-9]+)? 544 while (isdigit(C.peek())) 545 C.advance(); 546 if ((C.peek() == 'e' || C.peek() == 'E') && 547 (isdigit(C.peek(1)) || 548 ((C.peek(1) == '-' || C.peek(1) == '+') && isdigit(C.peek(2))))) { 549 C.advance(2); 550 while (isdigit(C.peek())) 551 C.advance(); 552 } 553 Token.reset(MIToken::FloatingPointLiteral, Range.upto(C)); 554 return C; 555 } 556 557 static Cursor maybeLexHexadecimalLiteral(Cursor C, MIToken &Token) { 558 if (C.peek() != '0' || (C.peek(1) != 'x' && C.peek(1) != 'X')) 559 return None; 560 Cursor Range = C; 561 C.advance(2); 562 unsigned PrefLen = 2; 563 if (isValidHexFloatingPointPrefix(C.peek())) { 564 C.advance(); 565 PrefLen++; 566 } 567 while (isxdigit(C.peek())) 568 C.advance(); 569 StringRef StrVal = Range.upto(C); 570 if (StrVal.size() <= PrefLen) 571 return None; 572 if (PrefLen == 2) 573 Token.reset(MIToken::HexLiteral, Range.upto(C)); 574 else // It must be 3, which means that there was a floating-point prefix. 575 Token.reset(MIToken::FloatingPointLiteral, Range.upto(C)); 576 return C; 577 } 578 579 static Cursor maybeLexNumericalLiteral(Cursor C, MIToken &Token) { 580 if (!isdigit(C.peek()) && (C.peek() != '-' || !isdigit(C.peek(1)))) 581 return None; 582 auto Range = C; 583 C.advance(); 584 while (isdigit(C.peek())) 585 C.advance(); 586 if (C.peek() == '.') 587 return lexFloatingPointLiteral(Range, C, Token); 588 StringRef StrVal = Range.upto(C); 589 Token.reset(MIToken::IntegerLiteral, StrVal).setIntegerValue(APSInt(StrVal)); 590 return C; 591 } 592 593 static MIToken::TokenKind getMetadataKeywordKind(StringRef Identifier) { 594 return StringSwitch<MIToken::TokenKind>(Identifier) 595 .Case("!tbaa", MIToken::md_tbaa) 596 .Case("!alias.scope", MIToken::md_alias_scope) 597 .Case("!noalias", MIToken::md_noalias) 598 .Case("!range", MIToken::md_range) 599 .Case("!DIExpression", MIToken::md_diexpr) 600 .Case("!DILocation", MIToken::md_dilocation) 601 .Default(MIToken::Error); 602 } 603 604 static Cursor maybeLexExclaim(Cursor C, MIToken &Token, 605 ErrorCallbackType ErrorCallback) { 606 if (C.peek() != '!') 607 return None; 608 auto Range = C; 609 C.advance(1); 610 if (isdigit(C.peek()) || !isIdentifierChar(C.peek())) { 611 Token.reset(MIToken::exclaim, Range.upto(C)); 612 return C; 613 } 614 while (isIdentifierChar(C.peek())) 615 C.advance(); 616 StringRef StrVal = Range.upto(C); 617 Token.reset(getMetadataKeywordKind(StrVal), StrVal); 618 if (Token.isError()) 619 ErrorCallback(Token.location(), 620 "use of unknown metadata keyword '" + StrVal + "'"); 621 return C; 622 } 623 624 static MIToken::TokenKind symbolToken(char C) { 625 switch (C) { 626 case ',': 627 return MIToken::comma; 628 case '.': 629 return MIToken::dot; 630 case '=': 631 return MIToken::equal; 632 case ':': 633 return MIToken::colon; 634 case '(': 635 return MIToken::lparen; 636 case ')': 637 return MIToken::rparen; 638 case '{': 639 return MIToken::lbrace; 640 case '}': 641 return MIToken::rbrace; 642 case '+': 643 return MIToken::plus; 644 case '-': 645 return MIToken::minus; 646 case '<': 647 return MIToken::less; 648 case '>': 649 return MIToken::greater; 650 default: 651 return MIToken::Error; 652 } 653 } 654 655 static Cursor maybeLexSymbol(Cursor C, MIToken &Token) { 656 MIToken::TokenKind Kind; 657 unsigned Length = 1; 658 if (C.peek() == ':' && C.peek(1) == ':') { 659 Kind = MIToken::coloncolon; 660 Length = 2; 661 } else 662 Kind = symbolToken(C.peek()); 663 if (Kind == MIToken::Error) 664 return None; 665 auto Range = C; 666 C.advance(Length); 667 Token.reset(Kind, Range.upto(C)); 668 return C; 669 } 670 671 static Cursor maybeLexNewline(Cursor C, MIToken &Token) { 672 if (!isNewlineChar(C.peek())) 673 return None; 674 auto Range = C; 675 C.advance(); 676 Token.reset(MIToken::Newline, Range.upto(C)); 677 return C; 678 } 679 680 static Cursor maybeLexEscapedIRValue(Cursor C, MIToken &Token, 681 ErrorCallbackType ErrorCallback) { 682 if (C.peek() != '`') 683 return None; 684 auto Range = C; 685 C.advance(); 686 auto StrRange = C; 687 while (C.peek() != '`') { 688 if (C.isEOF() || isNewlineChar(C.peek())) { 689 ErrorCallback( 690 C.location(), 691 "end of machine instruction reached before the closing '`'"); 692 Token.reset(MIToken::Error, Range.remaining()); 693 return C; 694 } 695 C.advance(); 696 } 697 StringRef Value = StrRange.upto(C); 698 C.advance(); 699 Token.reset(MIToken::QuotedIRValue, Range.upto(C)).setStringValue(Value); 700 return C; 701 } 702 703 StringRef llvm::lexMIToken(StringRef Source, MIToken &Token, 704 ErrorCallbackType ErrorCallback) { 705 auto C = skipComment(skipWhitespace(Cursor(Source))); 706 if (C.isEOF()) { 707 Token.reset(MIToken::Eof, C.remaining()); 708 return C.remaining(); 709 } 710 711 C = skipMachineOperandComment(C); 712 713 if (Cursor R = maybeLexMachineBasicBlock(C, Token, ErrorCallback)) 714 return R.remaining(); 715 if (Cursor R = maybeLexIdentifier(C, Token)) 716 return R.remaining(); 717 if (Cursor R = maybeLexJumpTableIndex(C, Token)) 718 return R.remaining(); 719 if (Cursor R = maybeLexStackObject(C, Token)) 720 return R.remaining(); 721 if (Cursor R = maybeLexFixedStackObject(C, Token)) 722 return R.remaining(); 723 if (Cursor R = maybeLexConstantPoolItem(C, Token)) 724 return R.remaining(); 725 if (Cursor R = maybeLexSubRegisterIndex(C, Token, ErrorCallback)) 726 return R.remaining(); 727 if (Cursor R = maybeLexIRBlock(C, Token, ErrorCallback)) 728 return R.remaining(); 729 if (Cursor R = maybeLexIRValue(C, Token, ErrorCallback)) 730 return R.remaining(); 731 if (Cursor R = maybeLexRegister(C, Token, ErrorCallback)) 732 return R.remaining(); 733 if (Cursor R = maybeLexGlobalValue(C, Token, ErrorCallback)) 734 return R.remaining(); 735 if (Cursor R = maybeLexExternalSymbol(C, Token, ErrorCallback)) 736 return R.remaining(); 737 if (Cursor R = maybeLexMCSymbol(C, Token, ErrorCallback)) 738 return R.remaining(); 739 if (Cursor R = maybeLexHexadecimalLiteral(C, Token)) 740 return R.remaining(); 741 if (Cursor R = maybeLexNumericalLiteral(C, Token)) 742 return R.remaining(); 743 if (Cursor R = maybeLexExclaim(C, Token, ErrorCallback)) 744 return R.remaining(); 745 if (Cursor R = maybeLexSymbol(C, Token)) 746 return R.remaining(); 747 if (Cursor R = maybeLexNewline(C, Token)) 748 return R.remaining(); 749 if (Cursor R = maybeLexEscapedIRValue(C, Token, ErrorCallback)) 750 return R.remaining(); 751 if (Cursor R = maybeLexStringConstant(C, Token, ErrorCallback)) 752 return R.remaining(); 753 754 Token.reset(MIToken::Error, C.remaining()); 755 ErrorCallback(C.location(), 756 Twine("unexpected character '") + Twine(C.peek()) + "'"); 757 return C.remaining(); 758 } 759
Indexes created Tue Feb 24 08:35:24 UTC 2026