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/StringExtras.h"
16 #include "llvm/ADT/StringSwitch.h"
17 #include "llvm/ADT/Twine.h"
24 /// This class provides a way to iterate and get characters from the source
31 Cursor(NoneType) : Ptr(nullptr), End(nullptr) {}
33 explicit Cursor(StringRef Str) {
35 End = Ptr + Str.size();
38 bool isEOF() const { return Ptr == End; }
40 char peek(int I = 0) const { return End - Ptr <= I ? 0 : Ptr[I]; }
42 void advance(unsigned I = 1) { Ptr += I; }
44 StringRef remaining() const { return StringRef(Ptr, End - Ptr); }
46 StringRef upto(Cursor C) const {
47 assert(C.Ptr >= Ptr && C.Ptr <= End);
48 return StringRef(Ptr, C.Ptr - Ptr);
51 StringRef::iterator location() const { return Ptr; }
53 operator bool() const { return Ptr != nullptr; }
56 } // end anonymous namespace
58 /// Skip the leading whitespace characters and return the updated cursor.
59 static Cursor skipWhitespace(Cursor C) {
60 while (isspace(C.peek()))
65 /// Return true if the given character satisfies the following regular
66 /// expression: [-a-zA-Z$._0-9]
67 static bool isIdentifierChar(char C) {
68 return isalpha(C) || isdigit(C) || C == '_' || C == '-' || C == '.' ||
72 void MIToken::unescapeQuotedStringValue(std::string &Str) const {
73 assert(isStringValueQuoted() && "String value isn't quoted");
74 StringRef Value = Range.drop_front(StringOffset);
75 assert(Value.front() == '"' && Value.back() == '"');
76 Cursor C = Cursor(Value.substr(1, Value.size() - 2));
79 Str.reserve(C.remaining().size());
83 if (C.peek(1) == '\\') {
89 if (isxdigit(C.peek(1)) && isxdigit(C.peek(2))) {
90 Str += hexDigitValue(C.peek(1)) * 16 + hexDigitValue(C.peek(2));
100 /// Lex a string constant using the following regular expression: \"[^\"]*\"
101 static Cursor lexStringConstant(
103 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
104 assert(C.peek() == '"');
105 for (C.advance(); C.peek() != '"'; C.advance()) {
109 "end of machine instruction reached before the closing '\"'");
117 static Cursor lexName(
118 Cursor C, MIToken &Token, MIToken::TokenKind Type,
119 MIToken::TokenKind QuotedType, unsigned PrefixLength,
120 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
122 C.advance(PrefixLength);
123 if (C.peek() == '"') {
124 if (Cursor R = lexStringConstant(C, ErrorCallback)) {
125 Token = MIToken(QuotedType, Range.upto(R), PrefixLength);
128 Token = MIToken(MIToken::Error, Range.remaining());
131 while (isIdentifierChar(C.peek()))
133 Token = MIToken(Type, Range.upto(C), PrefixLength);
137 static MIToken::TokenKind getIdentifierKind(StringRef Identifier) {
138 return StringSwitch<MIToken::TokenKind>(Identifier)
139 .Case("_", MIToken::underscore)
140 .Case("implicit", MIToken::kw_implicit)
141 .Case("implicit-def", MIToken::kw_implicit_define)
142 .Case("dead", MIToken::kw_dead)
143 .Case("killed", MIToken::kw_killed)
144 .Case("undef", MIToken::kw_undef)
145 .Case("frame-setup", MIToken::kw_frame_setup)
146 .Case("debug-location", MIToken::kw_debug_location)
147 .Case(".cfi_offset", MIToken::kw_cfi_offset)
148 .Case(".cfi_def_cfa_register", MIToken::kw_cfi_def_cfa_register)
149 .Case(".cfi_def_cfa_offset", MIToken::kw_cfi_def_cfa_offset)
150 .Case(".cfi_def_cfa", MIToken::kw_cfi_def_cfa)
151 .Case("blockaddress", MIToken::kw_blockaddress)
152 .Case("target-index", MIToken::kw_target_index)
153 .Case("half", MIToken::kw_half)
154 .Case("float", MIToken::kw_float)
155 .Case("double", MIToken::kw_double)
156 .Case("x86_fp80", MIToken::kw_x86_fp80)
157 .Case("fp128", MIToken::kw_fp128)
158 .Case("ppc_fp128", MIToken::kw_ppc_fp128)
159 .Default(MIToken::Identifier);
162 static Cursor maybeLexIdentifier(Cursor C, MIToken &Token) {
163 if (!isalpha(C.peek()) && C.peek() != '_' && C.peek() != '.')
166 while (isIdentifierChar(C.peek()))
168 auto Identifier = Range.upto(C);
169 Token = MIToken(getIdentifierKind(Identifier), Identifier);
173 static Cursor maybeLexMachineBasicBlock(
174 Cursor C, MIToken &Token,
175 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
176 if (!C.remaining().startswith("%bb."))
179 C.advance(4); // Skip '%bb.'
180 if (!isdigit(C.peek())) {
181 Token = MIToken(MIToken::Error, C.remaining());
182 ErrorCallback(C.location(), "expected a number after '%bb.'");
185 auto NumberRange = C;
186 while (isdigit(C.peek()))
188 StringRef Number = NumberRange.upto(C);
189 unsigned StringOffset = 4 + Number.size(); // Drop '%bb.<id>'
190 if (C.peek() == '.') {
191 C.advance(); // Skip '.'
193 while (isIdentifierChar(C.peek()))
196 Token = MIToken(MIToken::MachineBasicBlock, Range.upto(C), APSInt(Number),
201 static Cursor maybeLexIndex(Cursor C, MIToken &Token, StringRef Rule,
202 MIToken::TokenKind Kind) {
203 if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size())))
206 C.advance(Rule.size());
207 auto NumberRange = C;
208 while (isdigit(C.peek()))
210 Token = MIToken(Kind, Range.upto(C), APSInt(NumberRange.upto(C)));
214 static Cursor maybeLexIndexAndName(Cursor C, MIToken &Token, StringRef Rule,
215 MIToken::TokenKind Kind) {
216 if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size())))
219 C.advance(Rule.size());
220 auto NumberRange = C;
221 while (isdigit(C.peek()))
223 StringRef Number = NumberRange.upto(C);
224 unsigned StringOffset = Rule.size() + Number.size();
225 if (C.peek() == '.') {
228 while (isIdentifierChar(C.peek()))
231 Token = MIToken(Kind, Range.upto(C), APSInt(Number), StringOffset);
235 static Cursor maybeLexJumpTableIndex(Cursor C, MIToken &Token) {
236 return maybeLexIndex(C, Token, "%jump-table.", MIToken::JumpTableIndex);
239 static Cursor maybeLexStackObject(Cursor C, MIToken &Token) {
240 return maybeLexIndexAndName(C, Token, "%stack.", MIToken::StackObject);
243 static Cursor maybeLexFixedStackObject(Cursor C, MIToken &Token) {
244 return maybeLexIndex(C, Token, "%fixed-stack.", MIToken::FixedStackObject);
247 static Cursor maybeLexConstantPoolItem(Cursor C, MIToken &Token) {
248 return maybeLexIndex(C, Token, "%const.", MIToken::ConstantPoolItem);
251 static Cursor maybeLexIRBlock(
252 Cursor C, MIToken &Token,
253 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
254 const StringRef Rule = "%ir-block.";
255 if (!C.remaining().startswith(Rule))
257 if (isdigit(C.peek(Rule.size())))
258 return maybeLexIndex(C, Token, Rule, MIToken::IRBlock);
259 return lexName(C, Token, MIToken::NamedIRBlock, MIToken::QuotedNamedIRBlock,
260 Rule.size(), ErrorCallback);
263 static Cursor lexVirtualRegister(Cursor C, MIToken &Token) {
265 C.advance(); // Skip '%'
266 auto NumberRange = C;
267 while (isdigit(C.peek()))
269 Token = MIToken(MIToken::VirtualRegister, Range.upto(C),
270 APSInt(NumberRange.upto(C)));
274 static Cursor maybeLexRegister(Cursor C, MIToken &Token) {
277 if (isdigit(C.peek(1)))
278 return lexVirtualRegister(C, Token);
280 C.advance(); // Skip '%'
281 while (isIdentifierChar(C.peek()))
283 Token = MIToken(MIToken::NamedRegister, Range.upto(C),
284 /*StringOffset=*/1); // Drop the '%'
288 static Cursor maybeLexGlobalValue(
289 Cursor C, MIToken &Token,
290 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
293 if (!isdigit(C.peek(1)))
294 return lexName(C, Token, MIToken::NamedGlobalValue,
295 MIToken::QuotedNamedGlobalValue, /*PrefixLength=*/1,
298 C.advance(1); // Skip the '@'
299 auto NumberRange = C;
300 while (isdigit(C.peek()))
303 MIToken(MIToken::GlobalValue, Range.upto(C), APSInt(NumberRange.upto(C)));
307 static Cursor maybeLexExternalSymbol(
308 Cursor C, MIToken &Token,
309 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
312 return lexName(C, Token, MIToken::ExternalSymbol,
313 MIToken::QuotedExternalSymbol,
314 /*PrefixLength=*/1, ErrorCallback);
317 static bool isValidHexFloatingPointPrefix(char C) {
318 return C == 'H' || C == 'K' || C == 'L' || C == 'M';
321 static Cursor maybeLexHexFloatingPointLiteral(Cursor C, MIToken &Token) {
322 if (C.peek() != '0' || C.peek(1) != 'x')
325 C.advance(2); // Skip '0x'
326 if (isValidHexFloatingPointPrefix(C.peek()))
328 while (isxdigit(C.peek()))
330 Token = MIToken(MIToken::FloatingPointLiteral, Range.upto(C));
334 static Cursor lexFloatingPointLiteral(Cursor Range, Cursor C, MIToken &Token) {
336 // Skip over [0-9]*([eE][-+]?[0-9]+)?
337 while (isdigit(C.peek()))
339 if ((C.peek() == 'e' || C.peek() == 'E') &&
340 (isdigit(C.peek(1)) ||
341 ((C.peek(1) == '-' || C.peek(1) == '+') && isdigit(C.peek(2))))) {
343 while (isdigit(C.peek()))
346 Token = MIToken(MIToken::FloatingPointLiteral, Range.upto(C));
350 static Cursor maybeLexNumericalLiteral(Cursor C, MIToken &Token) {
351 if (!isdigit(C.peek()) && (C.peek() != '-' || !isdigit(C.peek(1))))
355 while (isdigit(C.peek()))
358 return lexFloatingPointLiteral(Range, C, Token);
359 StringRef StrVal = Range.upto(C);
360 Token = MIToken(MIToken::IntegerLiteral, StrVal, APSInt(StrVal));
364 static MIToken::TokenKind symbolToken(char C) {
367 return MIToken::comma;
369 return MIToken::equal;
371 return MIToken::colon;
373 return MIToken::exclaim;
375 return MIToken::lparen;
377 return MIToken::rparen;
379 return MIToken::Error;
383 static Cursor maybeLexSymbol(Cursor C, MIToken &Token) {
384 auto Kind = symbolToken(C.peek());
385 if (Kind == MIToken::Error)
389 Token = MIToken(Kind, Range.upto(C));
393 StringRef llvm::lexMIToken(
394 StringRef Source, MIToken &Token,
395 function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
396 auto C = skipWhitespace(Cursor(Source));
398 Token = MIToken(MIToken::Eof, C.remaining());
399 return C.remaining();
402 if (Cursor R = maybeLexIdentifier(C, Token))
403 return R.remaining();
404 if (Cursor R = maybeLexMachineBasicBlock(C, Token, ErrorCallback))
405 return R.remaining();
406 if (Cursor R = maybeLexJumpTableIndex(C, Token))
407 return R.remaining();
408 if (Cursor R = maybeLexStackObject(C, Token))
409 return R.remaining();
410 if (Cursor R = maybeLexFixedStackObject(C, Token))
411 return R.remaining();
412 if (Cursor R = maybeLexConstantPoolItem(C, Token))
413 return R.remaining();
414 if (Cursor R = maybeLexIRBlock(C, Token, ErrorCallback))
415 return R.remaining();
416 if (Cursor R = maybeLexRegister(C, Token))
417 return R.remaining();
418 if (Cursor R = maybeLexGlobalValue(C, Token, ErrorCallback))
419 return R.remaining();
420 if (Cursor R = maybeLexExternalSymbol(C, Token, ErrorCallback))
421 return R.remaining();
422 if (Cursor R = maybeLexHexFloatingPointLiteral(C, Token))
423 return R.remaining();
424 if (Cursor R = maybeLexNumericalLiteral(C, Token))
425 return R.remaining();
426 if (Cursor R = maybeLexSymbol(C, Token))
427 return R.remaining();
429 Token = MIToken(MIToken::Error, C.remaining());
430 ErrorCallback(C.location(),
431 Twine("unexpected character '") + Twine(C.peek()) + "'");
432 return C.remaining();