1 //===- MILexer.cpp - Machine instructions lexer implementation ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the lexing of machine instructions.
12 //===----------------------------------------------------------------------===//
15 #include "llvm/ADT/APSInt.h"
16 #include "llvm/ADT/None.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/StringExtras.h"
19 #include "llvm/ADT/StringSwitch.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/ADT/Twine.h"
31 using ErrorCallbackType =
32 function_ref<void(StringRef::iterator Loc, const Twine &)>;
34 /// This class provides a way to iterate and get characters from the source
37 const char *Ptr = nullptr;
38 const char *End = nullptr;
43 explicit Cursor(StringRef Str) {
45 End = Ptr + Str.size();
48 bool isEOF() const { return Ptr == End; }
50 char peek(int I = 0) const { return End - Ptr <= I ? 0 : Ptr[I]; }
52 void advance(unsigned I = 1) { Ptr += I; }
54 StringRef remaining() const { return StringRef(Ptr, End - Ptr); }
56 StringRef upto(Cursor C) const {
57 assert(C.Ptr >= Ptr && C.Ptr <= End);
58 return StringRef(Ptr, C.Ptr - Ptr);
61 StringRef::iterator location() const { return Ptr; }
63 operator bool() const { return Ptr != nullptr; }
66 } // end anonymous namespace
68 MIToken &MIToken::reset(TokenKind Kind, StringRef Range) {
74 MIToken &MIToken::setStringValue(StringRef StrVal) {
79 MIToken &MIToken::setOwnedStringValue(std::string StrVal) {
80 StringValueStorage = std::move(StrVal);
81 StringValue = StringValueStorage;
85 MIToken &MIToken::setIntegerValue(APSInt IntVal) {
86 this->IntVal = std::move(IntVal);
90 /// Skip the leading whitespace characters and return the updated cursor.
91 static Cursor skipWhitespace(Cursor C) {
92 while (isblank(C.peek()))
97 static bool isNewlineChar(char C) { return C == '\n' || C == '\r'; }
99 /// Skip a line comment and return the updated cursor.
100 static Cursor skipComment(Cursor C) {
103 while (!isNewlineChar(C.peek()) && !C.isEOF())
108 /// Return true if the given character satisfies the following regular
109 /// expression: [-a-zA-Z$._0-9]
110 static bool isIdentifierChar(char C) {
111 return isalpha(C) || isdigit(C) || C == '_' || C == '-' || C == '.' ||
115 /// Unescapes the given string value.
117 /// Expects the string value to be quoted.
118 static std::string unescapeQuotedString(StringRef Value) {
119 assert(Value.front() == '"' && Value.back() == '"');
120 Cursor C = Cursor(Value.substr(1, Value.size() - 2));
123 Str.reserve(C.remaining().size());
125 char Char = C.peek();
127 if (C.peek(1) == '\\') {
128 // Two '\' become one
133 if (isxdigit(C.peek(1)) && isxdigit(C.peek(2))) {
134 Str += hexDigitValue(C.peek(1)) * 16 + hexDigitValue(C.peek(2));
145 /// Lex a string constant using the following regular expression: \"[^\"]*\"
146 static Cursor lexStringConstant(Cursor C, ErrorCallbackType ErrorCallback) {
147 assert(C.peek() == '"');
148 for (C.advance(); C.peek() != '"'; C.advance()) {
149 if (C.isEOF() || isNewlineChar(C.peek())) {
152 "end of machine instruction reached before the closing '\"'");
160 static Cursor lexName(Cursor C, MIToken &Token, MIToken::TokenKind Type,
161 unsigned PrefixLength, ErrorCallbackType ErrorCallback) {
163 C.advance(PrefixLength);
164 if (C.peek() == '"') {
165 if (Cursor R = lexStringConstant(C, ErrorCallback)) {
166 StringRef String = Range.upto(R);
167 Token.reset(Type, String)
168 .setOwnedStringValue(
169 unescapeQuotedString(String.drop_front(PrefixLength)));
172 Token.reset(MIToken::Error, Range.remaining());
175 while (isIdentifierChar(C.peek()))
177 Token.reset(Type, Range.upto(C))
178 .setStringValue(Range.upto(C).drop_front(PrefixLength));
182 static MIToken::TokenKind getIdentifierKind(StringRef Identifier) {
183 return StringSwitch<MIToken::TokenKind>(Identifier)
184 .Case("_", MIToken::underscore)
185 .Case("implicit", MIToken::kw_implicit)
186 .Case("implicit-def", MIToken::kw_implicit_define)
187 .Case("def", MIToken::kw_def)
188 .Case("dead", MIToken::kw_dead)
189 .Case("killed", MIToken::kw_killed)
190 .Case("undef", MIToken::kw_undef)
191 .Case("internal", MIToken::kw_internal)
192 .Case("early-clobber", MIToken::kw_early_clobber)
193 .Case("debug-use", MIToken::kw_debug_use)
194 .Case("renamable", MIToken::kw_renamable)
195 .Case("tied-def", MIToken::kw_tied_def)
196 .Case("frame-setup", MIToken::kw_frame_setup)
197 .Case("frame-destroy", MIToken::kw_frame_destroy)
198 .Case("nnan", MIToken::kw_nnan)
199 .Case("ninf", MIToken::kw_ninf)
200 .Case("nsz", MIToken::kw_nsz)
201 .Case("arcp", MIToken::kw_arcp)
202 .Case("contract", MIToken::kw_contract)
203 .Case("afn", MIToken::kw_afn)
204 .Case("reassoc", MIToken::kw_reassoc)
205 .Case("debug-location", MIToken::kw_debug_location)
206 .Case("same_value", MIToken::kw_cfi_same_value)
207 .Case("offset", MIToken::kw_cfi_offset)
208 .Case("rel_offset", MIToken::kw_cfi_rel_offset)
209 .Case("def_cfa_register", MIToken::kw_cfi_def_cfa_register)
210 .Case("def_cfa_offset", MIToken::kw_cfi_def_cfa_offset)
211 .Case("adjust_cfa_offset", MIToken::kw_cfi_adjust_cfa_offset)
212 .Case("escape", MIToken::kw_cfi_escape)
213 .Case("def_cfa", MIToken::kw_cfi_def_cfa)
214 .Case("remember_state", MIToken::kw_cfi_remember_state)
215 .Case("restore", MIToken::kw_cfi_restore)
216 .Case("restore_state", MIToken::kw_cfi_restore_state)
217 .Case("undefined", MIToken::kw_cfi_undefined)
218 .Case("register", MIToken::kw_cfi_register)
219 .Case("window_save", MIToken::kw_cfi_window_save)
220 .Case("blockaddress", MIToken::kw_blockaddress)
221 .Case("intrinsic", MIToken::kw_intrinsic)
222 .Case("target-index", MIToken::kw_target_index)
223 .Case("half", MIToken::kw_half)
224 .Case("float", MIToken::kw_float)
225 .Case("double", MIToken::kw_double)
226 .Case("x86_fp80", MIToken::kw_x86_fp80)
227 .Case("fp128", MIToken::kw_fp128)
228 .Case("ppc_fp128", MIToken::kw_ppc_fp128)
229 .Case("target-flags", MIToken::kw_target_flags)
230 .Case("volatile", MIToken::kw_volatile)
231 .Case("non-temporal", MIToken::kw_non_temporal)
232 .Case("dereferenceable", MIToken::kw_dereferenceable)
233 .Case("invariant", MIToken::kw_invariant)
234 .Case("align", MIToken::kw_align)
235 .Case("addrspace", MIToken::kw_addrspace)
236 .Case("stack", MIToken::kw_stack)
237 .Case("got", MIToken::kw_got)
238 .Case("jump-table", MIToken::kw_jump_table)
239 .Case("constant-pool", MIToken::kw_constant_pool)
240 .Case("call-entry", MIToken::kw_call_entry)
241 .Case("liveout", MIToken::kw_liveout)
242 .Case("address-taken", MIToken::kw_address_taken)
243 .Case("landing-pad", MIToken::kw_landing_pad)
244 .Case("liveins", MIToken::kw_liveins)
245 .Case("successors", MIToken::kw_successors)
246 .Case("floatpred", MIToken::kw_floatpred)
247 .Case("intpred", MIToken::kw_intpred)
248 .Default(MIToken::Identifier);
251 static Cursor maybeLexIdentifier(Cursor C, MIToken &Token) {
252 if (!isalpha(C.peek()) && C.peek() != '_')
255 while (isIdentifierChar(C.peek()))
257 auto Identifier = Range.upto(C);
258 Token.reset(getIdentifierKind(Identifier), Identifier)
259 .setStringValue(Identifier);
263 static Cursor maybeLexMachineBasicBlock(Cursor C, MIToken &Token,
264 ErrorCallbackType ErrorCallback) {
265 bool IsReference = C.remaining().startswith("%bb.");
266 if (!IsReference && !C.remaining().startswith("bb."))
269 unsigned PrefixLength = IsReference ? 4 : 3;
270 C.advance(PrefixLength); // Skip '%bb.' or 'bb.'
271 if (!isdigit(C.peek())) {
272 Token.reset(MIToken::Error, C.remaining());
273 ErrorCallback(C.location(), "expected a number after '%bb.'");
276 auto NumberRange = C;
277 while (isdigit(C.peek()))
279 StringRef Number = NumberRange.upto(C);
280 unsigned StringOffset = PrefixLength + Number.size(); // Drop '%bb.<id>'
281 // TODO: The format bb.<id>.<irname> is supported only when it's not a
282 // reference. Once we deprecate the format where the irname shows up, we
283 // should only lex forward if it is a reference.
284 if (C.peek() == '.') {
285 C.advance(); // Skip '.'
287 while (isIdentifierChar(C.peek()))
290 Token.reset(IsReference ? MIToken::MachineBasicBlock
291 : MIToken::MachineBasicBlockLabel,
293 .setIntegerValue(APSInt(Number))
294 .setStringValue(Range.upto(C).drop_front(StringOffset));
298 static Cursor maybeLexIndex(Cursor C, MIToken &Token, StringRef Rule,
299 MIToken::TokenKind Kind) {
300 if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size())))
303 C.advance(Rule.size());
304 auto NumberRange = C;
305 while (isdigit(C.peek()))
307 Token.reset(Kind, Range.upto(C)).setIntegerValue(APSInt(NumberRange.upto(C)));
311 static Cursor maybeLexIndexAndName(Cursor C, MIToken &Token, StringRef Rule,
312 MIToken::TokenKind Kind) {
313 if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size())))
316 C.advance(Rule.size());
317 auto NumberRange = C;
318 while (isdigit(C.peek()))
320 StringRef Number = NumberRange.upto(C);
321 unsigned StringOffset = Rule.size() + Number.size();
322 if (C.peek() == '.') {
325 while (isIdentifierChar(C.peek()))
328 Token.reset(Kind, Range.upto(C))
329 .setIntegerValue(APSInt(Number))
330 .setStringValue(Range.upto(C).drop_front(StringOffset));
334 static Cursor maybeLexJumpTableIndex(Cursor C, MIToken &Token) {
335 return maybeLexIndex(C, Token, "%jump-table.", MIToken::JumpTableIndex);
338 static Cursor maybeLexStackObject(Cursor C, MIToken &Token) {
339 return maybeLexIndexAndName(C, Token, "%stack.", MIToken::StackObject);
342 static Cursor maybeLexFixedStackObject(Cursor C, MIToken &Token) {
343 return maybeLexIndex(C, Token, "%fixed-stack.", MIToken::FixedStackObject);
346 static Cursor maybeLexConstantPoolItem(Cursor C, MIToken &Token) {
347 return maybeLexIndex(C, Token, "%const.", MIToken::ConstantPoolItem);
350 static Cursor maybeLexSubRegisterIndex(Cursor C, MIToken &Token,
351 ErrorCallbackType ErrorCallback) {
352 const StringRef Rule = "%subreg.";
353 if (!C.remaining().startswith(Rule))
355 return lexName(C, Token, MIToken::SubRegisterIndex, Rule.size(),
359 static Cursor maybeLexIRBlock(Cursor C, MIToken &Token,
360 ErrorCallbackType ErrorCallback) {
361 const StringRef Rule = "%ir-block.";
362 if (!C.remaining().startswith(Rule))
364 if (isdigit(C.peek(Rule.size())))
365 return maybeLexIndex(C, Token, Rule, MIToken::IRBlock);
366 return lexName(C, Token, MIToken::NamedIRBlock, Rule.size(), ErrorCallback);
369 static Cursor maybeLexIRValue(Cursor C, MIToken &Token,
370 ErrorCallbackType ErrorCallback) {
371 const StringRef Rule = "%ir.";
372 if (!C.remaining().startswith(Rule))
374 if (isdigit(C.peek(Rule.size())))
375 return maybeLexIndex(C, Token, Rule, MIToken::IRValue);
376 return lexName(C, Token, MIToken::NamedIRValue, Rule.size(), ErrorCallback);
379 static Cursor maybeLexStringConstant(Cursor C, MIToken &Token,
380 ErrorCallbackType ErrorCallback) {
383 return lexName(C, Token, MIToken::StringConstant, /*PrefixLength=*/0,
387 static Cursor lexVirtualRegister(Cursor C, MIToken &Token) {
389 C.advance(); // Skip '%'
390 auto NumberRange = C;
391 while (isdigit(C.peek()))
393 Token.reset(MIToken::VirtualRegister, Range.upto(C))
394 .setIntegerValue(APSInt(NumberRange.upto(C)));
398 /// Returns true for a character allowed in a register name.
399 static bool isRegisterChar(char C) {
400 return isIdentifierChar(C) && C != '.';
403 static Cursor lexNamedVirtualRegister(Cursor C, MIToken &Token) {
405 C.advance(); // Skip '%'
406 while (isRegisterChar(C.peek()))
408 Token.reset(MIToken::NamedVirtualRegister, Range.upto(C))
409 .setStringValue(Range.upto(C).drop_front(1)); // Drop the '%'
413 static Cursor maybeLexRegister(Cursor C, MIToken &Token,
414 ErrorCallbackType ErrorCallback) {
415 if (C.peek() != '%' && C.peek() != '$')
418 if (C.peek() == '%') {
419 if (isdigit(C.peek(1)))
420 return lexVirtualRegister(C, Token);
422 if (isRegisterChar(C.peek(1)))
423 return lexNamedVirtualRegister(C, Token);
428 assert(C.peek() == '$');
430 C.advance(); // Skip '$'
431 while (isRegisterChar(C.peek()))
433 Token.reset(MIToken::NamedRegister, Range.upto(C))
434 .setStringValue(Range.upto(C).drop_front(1)); // Drop the '$'
438 static Cursor maybeLexGlobalValue(Cursor C, MIToken &Token,
439 ErrorCallbackType ErrorCallback) {
442 if (!isdigit(C.peek(1)))
443 return lexName(C, Token, MIToken::NamedGlobalValue, /*PrefixLength=*/1,
446 C.advance(1); // Skip the '@'
447 auto NumberRange = C;
448 while (isdigit(C.peek()))
450 Token.reset(MIToken::GlobalValue, Range.upto(C))
451 .setIntegerValue(APSInt(NumberRange.upto(C)));
455 static Cursor maybeLexExternalSymbol(Cursor C, MIToken &Token,
456 ErrorCallbackType ErrorCallback) {
459 return lexName(C, Token, MIToken::ExternalSymbol, /*PrefixLength=*/1,
463 static bool isValidHexFloatingPointPrefix(char C) {
464 return C == 'H' || C == 'K' || C == 'L' || C == 'M';
467 static Cursor lexFloatingPointLiteral(Cursor Range, Cursor C, MIToken &Token) {
469 // Skip over [0-9]*([eE][-+]?[0-9]+)?
470 while (isdigit(C.peek()))
472 if ((C.peek() == 'e' || C.peek() == 'E') &&
473 (isdigit(C.peek(1)) ||
474 ((C.peek(1) == '-' || C.peek(1) == '+') && isdigit(C.peek(2))))) {
476 while (isdigit(C.peek()))
479 Token.reset(MIToken::FloatingPointLiteral, Range.upto(C));
483 static Cursor maybeLexHexadecimalLiteral(Cursor C, MIToken &Token) {
484 if (C.peek() != '0' || (C.peek(1) != 'x' && C.peek(1) != 'X'))
488 unsigned PrefLen = 2;
489 if (isValidHexFloatingPointPrefix(C.peek())) {
493 while (isxdigit(C.peek()))
495 StringRef StrVal = Range.upto(C);
496 if (StrVal.size() <= PrefLen)
499 Token.reset(MIToken::HexLiteral, Range.upto(C));
500 else // It must be 3, which means that there was a floating-point prefix.
501 Token.reset(MIToken::FloatingPointLiteral, Range.upto(C));
505 static Cursor maybeLexNumericalLiteral(Cursor C, MIToken &Token) {
506 if (!isdigit(C.peek()) && (C.peek() != '-' || !isdigit(C.peek(1))))
510 while (isdigit(C.peek()))
513 return lexFloatingPointLiteral(Range, C, Token);
514 StringRef StrVal = Range.upto(C);
515 Token.reset(MIToken::IntegerLiteral, StrVal).setIntegerValue(APSInt(StrVal));
519 static MIToken::TokenKind getMetadataKeywordKind(StringRef Identifier) {
520 return StringSwitch<MIToken::TokenKind>(Identifier)
521 .Case("!tbaa", MIToken::md_tbaa)
522 .Case("!alias.scope", MIToken::md_alias_scope)
523 .Case("!noalias", MIToken::md_noalias)
524 .Case("!range", MIToken::md_range)
525 .Case("!DIExpression", MIToken::md_diexpr)
526 .Default(MIToken::Error);
529 static Cursor maybeLexExlaim(Cursor C, MIToken &Token,
530 ErrorCallbackType ErrorCallback) {
535 if (isdigit(C.peek()) || !isIdentifierChar(C.peek())) {
536 Token.reset(MIToken::exclaim, Range.upto(C));
539 while (isIdentifierChar(C.peek()))
541 StringRef StrVal = Range.upto(C);
542 Token.reset(getMetadataKeywordKind(StrVal), StrVal);
544 ErrorCallback(Token.location(),
545 "use of unknown metadata keyword '" + StrVal + "'");
549 static MIToken::TokenKind symbolToken(char C) {
552 return MIToken::comma;
556 return MIToken::equal;
558 return MIToken::colon;
560 return MIToken::lparen;
562 return MIToken::rparen;
564 return MIToken::lbrace;
566 return MIToken::rbrace;
568 return MIToken::plus;
570 return MIToken::minus;
572 return MIToken::less;
574 return MIToken::greater;
576 return MIToken::Error;
580 static Cursor maybeLexSymbol(Cursor C, MIToken &Token) {
581 MIToken::TokenKind Kind;
583 if (C.peek() == ':' && C.peek(1) == ':') {
584 Kind = MIToken::coloncolon;
587 Kind = symbolToken(C.peek());
588 if (Kind == MIToken::Error)
592 Token.reset(Kind, Range.upto(C));
596 static Cursor maybeLexNewline(Cursor C, MIToken &Token) {
597 if (!isNewlineChar(C.peek()))
601 Token.reset(MIToken::Newline, Range.upto(C));
605 static Cursor maybeLexEscapedIRValue(Cursor C, MIToken &Token,
606 ErrorCallbackType ErrorCallback) {
612 while (C.peek() != '`') {
613 if (C.isEOF() || isNewlineChar(C.peek())) {
616 "end of machine instruction reached before the closing '`'");
617 Token.reset(MIToken::Error, Range.remaining());
622 StringRef Value = StrRange.upto(C);
624 Token.reset(MIToken::QuotedIRValue, Range.upto(C)).setStringValue(Value);
628 StringRef llvm::lexMIToken(StringRef Source, MIToken &Token,
629 ErrorCallbackType ErrorCallback) {
630 auto C = skipComment(skipWhitespace(Cursor(Source)));
632 Token.reset(MIToken::Eof, C.remaining());
633 return C.remaining();
636 if (Cursor R = maybeLexMachineBasicBlock(C, Token, ErrorCallback))
637 return R.remaining();
638 if (Cursor R = maybeLexIdentifier(C, Token))
639 return R.remaining();
640 if (Cursor R = maybeLexJumpTableIndex(C, Token))
641 return R.remaining();
642 if (Cursor R = maybeLexStackObject(C, Token))
643 return R.remaining();
644 if (Cursor R = maybeLexFixedStackObject(C, Token))
645 return R.remaining();
646 if (Cursor R = maybeLexConstantPoolItem(C, Token))
647 return R.remaining();
648 if (Cursor R = maybeLexSubRegisterIndex(C, Token, ErrorCallback))
649 return R.remaining();
650 if (Cursor R = maybeLexIRBlock(C, Token, ErrorCallback))
651 return R.remaining();
652 if (Cursor R = maybeLexIRValue(C, Token, ErrorCallback))
653 return R.remaining();
654 if (Cursor R = maybeLexRegister(C, Token, ErrorCallback))
655 return R.remaining();
656 if (Cursor R = maybeLexGlobalValue(C, Token, ErrorCallback))
657 return R.remaining();
658 if (Cursor R = maybeLexExternalSymbol(C, Token, ErrorCallback))
659 return R.remaining();
660 if (Cursor R = maybeLexHexadecimalLiteral(C, Token))
661 return R.remaining();
662 if (Cursor R = maybeLexNumericalLiteral(C, Token))
663 return R.remaining();
664 if (Cursor R = maybeLexExlaim(C, Token, ErrorCallback))
665 return R.remaining();
666 if (Cursor R = maybeLexSymbol(C, Token))
667 return R.remaining();
668 if (Cursor R = maybeLexNewline(C, Token))
669 return R.remaining();
670 if (Cursor R = maybeLexEscapedIRValue(C, Token, ErrorCallback))
671 return R.remaining();
672 if (Cursor R = maybeLexStringConstant(C, Token, ErrorCallback))
673 return R.remaining();
675 Token.reset(MIToken::Error, C.remaining());
676 ErrorCallback(C.location(),
677 Twine("unexpected character '") + Twine(C.peek()) + "'");
678 return C.remaining();