1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_TOKEN_H_ 6 #define V8_TOKEN_H_ 7 8 #include "src/base/logging.h" 9 10 namespace v8 { 11 namespace internal { 12 13 // TOKEN_LIST takes a list of 3 macros M, all of which satisfy the 14 // same signature M(name, string, precedence), where name is the 15 // symbolic token name, string is the corresponding syntactic symbol 16 // (or NULL, for literals), and precedence is the precedence (or 0). 17 // The parameters are invoked for token categories as follows: 18 // 19 // T: Non-keyword tokens 20 // K: Keyword tokens 21 22 // IGNORE_TOKEN is a convenience macro that can be supplied as 23 // an argument (at any position) for a TOKEN_LIST call. It does 24 // nothing with tokens belonging to the respective category. 25 26 #define IGNORE_TOKEN(name, string, precedence) 27 28 #define TOKEN_LIST(T, K) \ 29 /* End of source indicator. */ \ 30 T(EOS, "EOS", 0) \ 31 \ 32 /* Punctuators (ECMA-262, section 7.7, page 15). */ \ 33 T(LPAREN, "(", 0) \ 34 T(RPAREN, ")", 0) \ 35 T(LBRACK, "[", 0) \ 36 T(RBRACK, "]", 0) \ 37 T(LBRACE, "{", 0) \ 38 T(RBRACE, "}", 0) \ 39 T(COLON, ":", 0) \ 40 T(SEMICOLON, ";", 0) \ 41 T(PERIOD, ".", 0) \ 42 T(CONDITIONAL, "?", 3) \ 43 T(INC, "++", 0) \ 44 T(DEC, "--", 0) \ 45 T(ARROW, "=>", 0) \ 46 \ 47 /* Assignment operators. */ \ 48 /* IsAssignmentOp() and Assignment::is_compound() relies on */ \ 49 /* this block of enum values being contiguous and sorted in the */ \ 50 /* same order! */ \ 51 T(INIT_VAR, "=init_var", 2) /* AST-use only. */ \ 52 T(INIT_LET, "=init_let", 2) /* AST-use only. */ \ 53 T(INIT_CONST, "=init_const", 2) /* AST-use only. */ \ 54 T(INIT_CONST_LEGACY, "=init_const_legacy", 2) /* AST-use only. */ \ 55 T(ASSIGN, "=", 2) \ 56 T(ASSIGN_BIT_OR, "|=", 2) \ 57 T(ASSIGN_BIT_XOR, "^=", 2) \ 58 T(ASSIGN_BIT_AND, "&=", 2) \ 59 T(ASSIGN_SHL, "<<=", 2) \ 60 T(ASSIGN_SAR, ">>=", 2) \ 61 T(ASSIGN_SHR, ">>>=", 2) \ 62 T(ASSIGN_ADD, "+=", 2) \ 63 T(ASSIGN_SUB, "-=", 2) \ 64 T(ASSIGN_MUL, "*=", 2) \ 65 T(ASSIGN_DIV, "/=", 2) \ 66 T(ASSIGN_MOD, "%=", 2) \ 67 \ 68 /* Binary operators sorted by precedence. */ \ 69 /* IsBinaryOp() relies on this block of enum values */ \ 70 /* being contiguous and sorted in the same order! */ \ 71 T(COMMA, ",", 1) \ 72 T(OR, "||", 4) \ 73 T(AND, "&&", 5) \ 74 T(BIT_OR, "|", 6) \ 75 T(BIT_XOR, "^", 7) \ 76 T(BIT_AND, "&", 8) \ 77 T(SHL, "<<", 11) \ 78 T(SAR, ">>", 11) \ 79 T(SHR, ">>>", 11) \ 80 T(ROR, "rotate right", 11) /* only used by Crankshaft */ \ 81 T(ADD, "+", 12) \ 82 T(SUB, "-", 12) \ 83 T(MUL, "*", 13) \ 84 T(DIV, "/", 13) \ 85 T(MOD, "%", 13) \ 86 \ 87 /* Compare operators sorted by precedence. */ \ 88 /* IsCompareOp() relies on this block of enum values */ \ 89 /* being contiguous and sorted in the same order! */ \ 90 T(EQ, "==", 9) \ 91 T(NE, "!=", 9) \ 92 T(EQ_STRICT, "===", 9) \ 93 T(NE_STRICT, "!==", 9) \ 94 T(LT, "<", 10) \ 95 T(GT, ">", 10) \ 96 T(LTE, "<=", 10) \ 97 T(GTE, ">=", 10) \ 98 K(INSTANCEOF, "instanceof", 10) \ 99 K(IN, "in", 10) \ 100 \ 101 /* Unary operators. */ \ 102 /* IsUnaryOp() relies on this block of enum values */ \ 103 /* being contiguous and sorted in the same order! */ \ 104 T(NOT, "!", 0) \ 105 T(BIT_NOT, "~", 0) \ 106 K(DELETE, "delete", 0) \ 107 K(TYPEOF, "typeof", 0) \ 108 K(VOID, "void", 0) \ 109 \ 110 /* Keywords (ECMA-262, section 7.5.2, page 13). */ \ 111 K(BREAK, "break", 0) \ 112 K(CASE, "case", 0) \ 113 K(CATCH, "catch", 0) \ 114 K(CONTINUE, "continue", 0) \ 115 K(DEBUGGER, "debugger", 0) \ 116 K(DEFAULT, "default", 0) \ 117 /* DELETE */ \ 118 K(DO, "do", 0) \ 119 K(ELSE, "else", 0) \ 120 K(FINALLY, "finally", 0) \ 121 K(FOR, "for", 0) \ 122 K(FUNCTION, "function", 0) \ 123 K(IF, "if", 0) \ 124 /* IN */ \ 125 /* INSTANCEOF */ \ 126 K(NEW, "new", 0) \ 127 K(RETURN, "return", 0) \ 128 K(SWITCH, "switch", 0) \ 129 K(THIS, "this", 0) \ 130 K(THROW, "throw", 0) \ 131 K(TRY, "try", 0) \ 132 /* TYPEOF */ \ 133 K(VAR, "var", 0) \ 134 /* VOID */ \ 135 K(WHILE, "while", 0) \ 136 K(WITH, "with", 0) \ 137 \ 138 /* Literals (ECMA-262, section 7.8, page 16). */ \ 139 K(NULL_LITERAL, "null", 0) \ 140 K(TRUE_LITERAL, "true", 0) \ 141 K(FALSE_LITERAL, "false", 0) \ 142 T(NUMBER, NULL, 0) \ 143 T(STRING, NULL, 0) \ 144 \ 145 /* Identifiers (not keywords or future reserved words). */ \ 146 T(IDENTIFIER, NULL, 0) \ 147 \ 148 /* Future reserved words (ECMA-262, section 7.6.1.2). */ \ 149 T(FUTURE_RESERVED_WORD, NULL, 0) \ 150 T(FUTURE_STRICT_RESERVED_WORD, NULL, 0) \ 151 K(CLASS, "class", 0) \ 152 K(CONST, "const", 0) \ 153 K(EXPORT, "export", 0) \ 154 K(EXTENDS, "extends", 0) \ 155 K(IMPORT, "import", 0) \ 156 K(LET, "let", 0) \ 157 K(STATIC, "static", 0) \ 158 K(YIELD, "yield", 0) \ 159 K(SUPER, "super", 0) \ 160 \ 161 /* Illegal token - not able to scan. */ \ 162 T(ILLEGAL, "ILLEGAL", 0) \ 163 \ 164 /* Scanner-internal use only. */ \ 165 T(WHITESPACE, NULL, 0) 166 167 168 class Token { 169 public: 170 // All token values. 171 #define T(name, string, precedence) name, 172 enum Value { 173 TOKEN_LIST(T, T) 174 NUM_TOKENS 175 }; 176 #undef T 177 178 // Returns a string corresponding to the C++ token name 179 // (e.g. "LT" for the token LT). Name(Value tok)180 static const char* Name(Value tok) { 181 DCHECK(tok < NUM_TOKENS); // tok is unsigned 182 return name_[tok]; 183 } 184 185 // Predicates IsKeyword(Value tok)186 static bool IsKeyword(Value tok) { 187 return token_type[tok] == 'K'; 188 } 189 IsAssignmentOp(Value tok)190 static bool IsAssignmentOp(Value tok) { 191 return INIT_VAR <= tok && tok <= ASSIGN_MOD; 192 } 193 IsBinaryOp(Value op)194 static bool IsBinaryOp(Value op) { 195 return COMMA <= op && op <= MOD; 196 } 197 IsTruncatingBinaryOp(Value op)198 static bool IsTruncatingBinaryOp(Value op) { 199 return BIT_OR <= op && op <= ROR; 200 } 201 IsCompareOp(Value op)202 static bool IsCompareOp(Value op) { 203 return EQ <= op && op <= IN; 204 } 205 IsOrderedRelationalCompareOp(Value op)206 static bool IsOrderedRelationalCompareOp(Value op) { 207 return op == LT || op == LTE || op == GT || op == GTE; 208 } 209 IsEqualityOp(Value op)210 static bool IsEqualityOp(Value op) { 211 return op == EQ || op == EQ_STRICT; 212 } 213 IsInequalityOp(Value op)214 static bool IsInequalityOp(Value op) { 215 return op == NE || op == NE_STRICT; 216 } 217 IsArithmeticCompareOp(Value op)218 static bool IsArithmeticCompareOp(Value op) { 219 return IsOrderedRelationalCompareOp(op) || 220 IsEqualityOp(op) || IsInequalityOp(op); 221 } 222 NegateCompareOp(Value op)223 static Value NegateCompareOp(Value op) { 224 DCHECK(IsArithmeticCompareOp(op)); 225 switch (op) { 226 case EQ: return NE; 227 case NE: return EQ; 228 case EQ_STRICT: return NE_STRICT; 229 case NE_STRICT: return EQ_STRICT; 230 case LT: return GTE; 231 case GT: return LTE; 232 case LTE: return GT; 233 case GTE: return LT; 234 default: 235 UNREACHABLE(); 236 return op; 237 } 238 } 239 ReverseCompareOp(Value op)240 static Value ReverseCompareOp(Value op) { 241 DCHECK(IsArithmeticCompareOp(op)); 242 switch (op) { 243 case EQ: return EQ; 244 case NE: return NE; 245 case EQ_STRICT: return EQ_STRICT; 246 case NE_STRICT: return NE_STRICT; 247 case LT: return GT; 248 case GT: return LT; 249 case LTE: return GTE; 250 case GTE: return LTE; 251 default: 252 UNREACHABLE(); 253 return op; 254 } 255 } 256 IsBitOp(Value op)257 static bool IsBitOp(Value op) { 258 return (BIT_OR <= op && op <= SHR) || op == BIT_NOT; 259 } 260 IsUnaryOp(Value op)261 static bool IsUnaryOp(Value op) { 262 return (NOT <= op && op <= VOID) || op == ADD || op == SUB; 263 } 264 IsCountOp(Value op)265 static bool IsCountOp(Value op) { 266 return op == INC || op == DEC; 267 } 268 IsShiftOp(Value op)269 static bool IsShiftOp(Value op) { 270 return (SHL <= op) && (op <= SHR); 271 } 272 273 // Returns a string corresponding to the JS token string 274 // (.e., "<" for the token LT) or NULL if the token doesn't 275 // have a (unique) string (e.g. an IDENTIFIER). String(Value tok)276 static const char* String(Value tok) { 277 DCHECK(tok < NUM_TOKENS); // tok is unsigned. 278 return string_[tok]; 279 } 280 281 // Returns the precedence > 0 for binary and compare 282 // operators; returns 0 otherwise. Precedence(Value tok)283 static int Precedence(Value tok) { 284 DCHECK(tok < NUM_TOKENS); // tok is unsigned. 285 return precedence_[tok]; 286 } 287 288 private: 289 static const char* const name_[NUM_TOKENS]; 290 static const char* const string_[NUM_TOKENS]; 291 static const int8_t precedence_[NUM_TOKENS]; 292 static const char token_type[NUM_TOKENS]; 293 }; 294 295 } } // namespace v8::internal 296 297 #endif // V8_TOKEN_H_ 298