| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_TOKEN_H_ |
| #define V8_TOKEN_H_ |
| |
| #include "src/checks.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // TOKEN_LIST takes a list of 3 macros M, all of which satisfy the |
| // same signature M(name, string, precedence), where name is the |
| // symbolic token name, string is the corresponding syntactic symbol |
| // (or NULL, for literals), and precedence is the precedence (or 0). |
| // The parameters are invoked for token categories as follows: |
| // |
| // T: Non-keyword tokens |
| // K: Keyword tokens |
| |
| // IGNORE_TOKEN is a convenience macro that can be supplied as |
| // an argument (at any position) for a TOKEN_LIST call. It does |
| // nothing with tokens belonging to the respective category. |
| |
| #define IGNORE_TOKEN(name, string, precedence) |
| |
| #define TOKEN_LIST(T, K) \ |
| /* End of source indicator. */ \ |
| T(EOS, "EOS", 0) \ |
| \ |
| /* Punctuators (ECMA-262, section 7.7, page 15). */ \ |
| T(LPAREN, "(", 0) \ |
| T(RPAREN, ")", 0) \ |
| T(LBRACK, "[", 0) \ |
| T(RBRACK, "]", 0) \ |
| T(LBRACE, "{", 0) \ |
| T(RBRACE, "}", 0) \ |
| T(COLON, ":", 0) \ |
| T(SEMICOLON, ";", 0) \ |
| T(PERIOD, ".", 0) \ |
| T(CONDITIONAL, "?", 3) \ |
| T(INC, "++", 0) \ |
| T(DEC, "--", 0) \ |
| \ |
| /* Assignment operators. */ \ |
| /* IsAssignmentOp() and Assignment::is_compound() relies on */ \ |
| /* this block of enum values being contiguous and sorted in the */ \ |
| /* same order! */ \ |
| T(INIT_VAR, "=init_var", 2) /* AST-use only. */ \ |
| T(INIT_LET, "=init_let", 2) /* AST-use only. */ \ |
| T(INIT_CONST, "=init_const", 2) /* AST-use only. */ \ |
| T(INIT_CONST_LEGACY, "=init_const_legacy", 2) /* AST-use only. */ \ |
| T(ASSIGN, "=", 2) \ |
| T(ASSIGN_BIT_OR, "|=", 2) \ |
| T(ASSIGN_BIT_XOR, "^=", 2) \ |
| T(ASSIGN_BIT_AND, "&=", 2) \ |
| T(ASSIGN_SHL, "<<=", 2) \ |
| T(ASSIGN_SAR, ">>=", 2) \ |
| T(ASSIGN_SHR, ">>>=", 2) \ |
| T(ASSIGN_ADD, "+=", 2) \ |
| T(ASSIGN_SUB, "-=", 2) \ |
| T(ASSIGN_MUL, "*=", 2) \ |
| T(ASSIGN_DIV, "/=", 2) \ |
| T(ASSIGN_MOD, "%=", 2) \ |
| \ |
| /* Binary operators sorted by precedence. */ \ |
| /* IsBinaryOp() relies on this block of enum values */ \ |
| /* being contiguous and sorted in the same order! */ \ |
| T(COMMA, ",", 1) \ |
| T(OR, "||", 4) \ |
| T(AND, "&&", 5) \ |
| T(BIT_OR, "|", 6) \ |
| T(BIT_XOR, "^", 7) \ |
| T(BIT_AND, "&", 8) \ |
| T(SHL, "<<", 11) \ |
| T(SAR, ">>", 11) \ |
| T(SHR, ">>>", 11) \ |
| T(ROR, "rotate right", 11) /* only used by Crankshaft */ \ |
| T(ADD, "+", 12) \ |
| T(SUB, "-", 12) \ |
| T(MUL, "*", 13) \ |
| T(DIV, "/", 13) \ |
| T(MOD, "%", 13) \ |
| \ |
| /* Compare operators sorted by precedence. */ \ |
| /* IsCompareOp() relies on this block of enum values */ \ |
| /* being contiguous and sorted in the same order! */ \ |
| T(EQ, "==", 9) \ |
| T(NE, "!=", 9) \ |
| T(EQ_STRICT, "===", 9) \ |
| T(NE_STRICT, "!==", 9) \ |
| T(LT, "<", 10) \ |
| T(GT, ">", 10) \ |
| T(LTE, "<=", 10) \ |
| T(GTE, ">=", 10) \ |
| K(INSTANCEOF, "instanceof", 10) \ |
| K(IN, "in", 10) \ |
| \ |
| /* Unary operators. */ \ |
| /* IsUnaryOp() relies on this block of enum values */ \ |
| /* being contiguous and sorted in the same order! */ \ |
| T(NOT, "!", 0) \ |
| T(BIT_NOT, "~", 0) \ |
| K(DELETE, "delete", 0) \ |
| K(TYPEOF, "typeof", 0) \ |
| K(VOID, "void", 0) \ |
| \ |
| /* Keywords (ECMA-262, section 7.5.2, page 13). */ \ |
| K(BREAK, "break", 0) \ |
| K(CASE, "case", 0) \ |
| K(CATCH, "catch", 0) \ |
| K(CONTINUE, "continue", 0) \ |
| K(DEBUGGER, "debugger", 0) \ |
| K(DEFAULT, "default", 0) \ |
| /* DELETE */ \ |
| K(DO, "do", 0) \ |
| K(ELSE, "else", 0) \ |
| K(FINALLY, "finally", 0) \ |
| K(FOR, "for", 0) \ |
| K(FUNCTION, "function", 0) \ |
| K(IF, "if", 0) \ |
| /* IN */ \ |
| /* INSTANCEOF */ \ |
| K(NEW, "new", 0) \ |
| K(RETURN, "return", 0) \ |
| K(SWITCH, "switch", 0) \ |
| K(THIS, "this", 0) \ |
| K(THROW, "throw", 0) \ |
| K(TRY, "try", 0) \ |
| /* TYPEOF */ \ |
| K(VAR, "var", 0) \ |
| /* VOID */ \ |
| K(WHILE, "while", 0) \ |
| K(WITH, "with", 0) \ |
| \ |
| /* Literals (ECMA-262, section 7.8, page 16). */ \ |
| K(NULL_LITERAL, "null", 0) \ |
| K(TRUE_LITERAL, "true", 0) \ |
| K(FALSE_LITERAL, "false", 0) \ |
| T(NUMBER, NULL, 0) \ |
| T(STRING, NULL, 0) \ |
| \ |
| /* Identifiers (not keywords or future reserved words). */ \ |
| T(IDENTIFIER, NULL, 0) \ |
| \ |
| /* Future reserved words (ECMA-262, section 7.6.1.2). */ \ |
| T(FUTURE_RESERVED_WORD, NULL, 0) \ |
| T(FUTURE_STRICT_RESERVED_WORD, NULL, 0) \ |
| K(CONST, "const", 0) \ |
| K(EXPORT, "export", 0) \ |
| K(IMPORT, "import", 0) \ |
| K(LET, "let", 0) \ |
| K(YIELD, "yield", 0) \ |
| \ |
| /* Illegal token - not able to scan. */ \ |
| T(ILLEGAL, "ILLEGAL", 0) \ |
| \ |
| /* Scanner-internal use only. */ \ |
| T(WHITESPACE, NULL, 0) |
| |
| |
| class Token { |
| public: |
| // All token values. |
| #define T(name, string, precedence) name, |
| enum Value { |
| TOKEN_LIST(T, T) |
| NUM_TOKENS |
| }; |
| #undef T |
| |
| // Returns a string corresponding to the C++ token name |
| // (e.g. "LT" for the token LT). |
| static const char* Name(Value tok) { |
| ASSERT(tok < NUM_TOKENS); // tok is unsigned |
| return name_[tok]; |
| } |
| |
| // Predicates |
| static bool IsKeyword(Value tok) { |
| return token_type[tok] == 'K'; |
| } |
| |
| static bool IsAssignmentOp(Value tok) { |
| return INIT_VAR <= tok && tok <= ASSIGN_MOD; |
| } |
| |
| static bool IsBinaryOp(Value op) { |
| return COMMA <= op && op <= MOD; |
| } |
| |
| static bool IsTruncatingBinaryOp(Value op) { |
| return BIT_OR <= op && op <= ROR; |
| } |
| |
| static bool IsCompareOp(Value op) { |
| return EQ <= op && op <= IN; |
| } |
| |
| static bool IsOrderedRelationalCompareOp(Value op) { |
| return op == LT || op == LTE || op == GT || op == GTE; |
| } |
| |
| static bool IsEqualityOp(Value op) { |
| return op == EQ || op == EQ_STRICT; |
| } |
| |
| static bool IsInequalityOp(Value op) { |
| return op == NE || op == NE_STRICT; |
| } |
| |
| static bool IsArithmeticCompareOp(Value op) { |
| return IsOrderedRelationalCompareOp(op) || |
| IsEqualityOp(op) || IsInequalityOp(op); |
| } |
| |
| static Value NegateCompareOp(Value op) { |
| ASSERT(IsArithmeticCompareOp(op)); |
| switch (op) { |
| case EQ: return NE; |
| case NE: return EQ; |
| case EQ_STRICT: return NE_STRICT; |
| case NE_STRICT: return EQ_STRICT; |
| case LT: return GTE; |
| case GT: return LTE; |
| case LTE: return GT; |
| case GTE: return LT; |
| default: |
| UNREACHABLE(); |
| return op; |
| } |
| } |
| |
| static Value ReverseCompareOp(Value op) { |
| ASSERT(IsArithmeticCompareOp(op)); |
| switch (op) { |
| case EQ: return EQ; |
| case NE: return NE; |
| case EQ_STRICT: return EQ_STRICT; |
| case NE_STRICT: return NE_STRICT; |
| case LT: return GT; |
| case GT: return LT; |
| case LTE: return GTE; |
| case GTE: return LTE; |
| default: |
| UNREACHABLE(); |
| return op; |
| } |
| } |
| |
| static bool IsBitOp(Value op) { |
| return (BIT_OR <= op && op <= SHR) || op == BIT_NOT; |
| } |
| |
| static bool IsUnaryOp(Value op) { |
| return (NOT <= op && op <= VOID) || op == ADD || op == SUB; |
| } |
| |
| static bool IsCountOp(Value op) { |
| return op == INC || op == DEC; |
| } |
| |
| static bool IsShiftOp(Value op) { |
| return (SHL <= op) && (op <= SHR); |
| } |
| |
| // Returns a string corresponding to the JS token string |
| // (.e., "<" for the token LT) or NULL if the token doesn't |
| // have a (unique) string (e.g. an IDENTIFIER). |
| static const char* String(Value tok) { |
| ASSERT(tok < NUM_TOKENS); // tok is unsigned. |
| return string_[tok]; |
| } |
| |
| // Returns the precedence > 0 for binary and compare |
| // operators; returns 0 otherwise. |
| static int Precedence(Value tok) { |
| ASSERT(tok < NUM_TOKENS); // tok is unsigned. |
| return precedence_[tok]; |
| } |
| |
| private: |
| static const char* const name_[NUM_TOKENS]; |
| static const char* const string_[NUM_TOKENS]; |
| static const int8_t precedence_[NUM_TOKENS]; |
| static const char token_type[NUM_TOKENS]; |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TOKEN_H_ |
