| // 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_PARSING_TOKEN_H_ |
| #define V8_PARSING_TOKEN_H_ |
| |
| #include "src/base/bit-field.h" |
| #include "src/base/bounds.h" |
| #include "src/base/logging.h" |
| #include "src/common/globals.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 nullptr, 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) |
| |
| /* Binary operators */ |
| /* ADD and SUB are at the end since they are UnaryOp */ |
| #define BINARY_OP_TOKEN_LIST(T, E) \ |
| E(T, NULLISH, "??", 3) \ |
| E(T, OR, "||", 4) \ |
| E(T, AND, "&&", 5) \ |
| E(T, BIT_OR, "|", 6) \ |
| E(T, BIT_XOR, "^", 7) \ |
| E(T, BIT_AND, "&", 8) \ |
| E(T, SHL, "<<", 11) \ |
| E(T, SAR, ">>", 11) \ |
| E(T, SHR, ">>>", 11) \ |
| E(T, MUL, "*", 13) \ |
| E(T, DIV, "/", 13) \ |
| E(T, MOD, "%", 13) \ |
| E(T, EXP, "**", 14) \ |
| E(T, ADD, "+", 12) \ |
| E(T, SUB, "-", 12) |
| |
| #define EXPAND_BINOP_ASSIGN_TOKEN(T, name, string, precedence) \ |
| T(ASSIGN_##name, string "=", 2) |
| |
| #define EXPAND_BINOP_TOKEN(T, name, string, precedence) \ |
| T(name, string, precedence) |
| |
| #define TOKEN_LIST(T, K) \ |
| \ |
| /* BEGIN PropertyOrCall */ \ |
| /* BEGIN Member */ \ |
| /* BEGIN Template */ \ |
| /* ES6 Template Literals */ \ |
| T(TEMPLATE_SPAN, nullptr, 0) \ |
| T(TEMPLATE_TAIL, nullptr, 0) \ |
| /* END Template */ \ |
| \ |
| /* Punctuators (ECMA-262, section 7.7, page 15). */ \ |
| /* BEGIN Property */ \ |
| T(PERIOD, ".", 0) \ |
| T(LBRACK, "[", 0) \ |
| /* END Property */ \ |
| /* END Member */ \ |
| T(QUESTION_PERIOD, "?.", 0) \ |
| T(LPAREN, "(", 0) \ |
| /* END PropertyOrCall */ \ |
| T(RPAREN, ")", 0) \ |
| T(RBRACK, "]", 0) \ |
| T(LBRACE, "{", 0) \ |
| T(COLON, ":", 0) \ |
| T(ELLIPSIS, "...", 0) \ |
| T(CONDITIONAL, "?", 3) \ |
| /* BEGIN AutoSemicolon */ \ |
| T(SEMICOLON, ";", 0) \ |
| T(RBRACE, "}", 0) \ |
| /* End of source indicator. */ \ |
| T(EOS, "EOS", 0) \ |
| /* END AutoSemicolon */ \ |
| \ |
| /* BEGIN ArrowOrAssignmentOp */ \ |
| T(ARROW, "=>", 0) \ |
| /* BEGIN AssignmentOp */ \ |
| /* IsAssignmentOp() relies on this block of enum values being */ \ |
| /* contiguous and sorted in the same order! */ \ |
| T(INIT, "=init", 2) /* AST-use only. */ \ |
| T(ASSIGN, "=", 2) \ |
| BINARY_OP_TOKEN_LIST(T, EXPAND_BINOP_ASSIGN_TOKEN) \ |
| /* END AssignmentOp */ \ |
| /* END ArrowOrAssignmentOp */ \ |
| \ |
| /* Binary operators sorted by precedence. */ \ |
| /* IsBinaryOp() relies on this block of enum values */ \ |
| /* being contiguous and sorted in the same order! */ \ |
| T(COMMA, ",", 1) \ |
| \ |
| /* Unary operators, starting at ADD in BINARY_OP_TOKEN_LIST */ \ |
| /* IsUnaryOp() relies on this block of enum values */ \ |
| /* being contiguous and sorted in the same order! */ \ |
| BINARY_OP_TOKEN_LIST(T, EXPAND_BINOP_TOKEN) \ |
| \ |
| T(NOT, "!", 0) \ |
| T(BIT_NOT, "~", 0) \ |
| K(DELETE, "delete", 0) \ |
| K(TYPEOF, "typeof", 0) \ |
| K(VOID, "void", 0) \ |
| \ |
| /* BEGIN IsCountOp */ \ |
| T(INC, "++", 0) \ |
| T(DEC, "--", 0) \ |
| /* END IsCountOp */ \ |
| /* END IsUnaryOrCountOp */ \ |
| \ |
| /* 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(EQ_STRICT, "===", 9) \ |
| T(NE, "!=", 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) \ |
| \ |
| /* 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(THROW, "throw", 0) \ |
| K(TRY, "try", 0) \ |
| /* TYPEOF */ \ |
| K(VAR, "var", 0) \ |
| /* VOID */ \ |
| K(WHILE, "while", 0) \ |
| K(WITH, "with", 0) \ |
| K(THIS, "this", 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, nullptr, 0) \ |
| T(SMI, nullptr, 0) \ |
| T(BIGINT, nullptr, 0) \ |
| T(STRING, nullptr, 0) \ |
| \ |
| /* BEGIN Callable */ \ |
| K(SUPER, "super", 0) \ |
| /* BEGIN AnyIdentifier */ \ |
| /* Identifiers (not keywords or future reserved words). */ \ |
| T(IDENTIFIER, nullptr, 0) \ |
| K(GET, "get", 0) \ |
| K(SET, "set", 0) \ |
| K(ASYNC, "async", 0) \ |
| /* `await` is a reserved word in module code only */ \ |
| K(AWAIT, "await", 0) \ |
| K(YIELD, "yield", 0) \ |
| K(LET, "let", 0) \ |
| K(STATIC, "static", 0) \ |
| /* Future reserved words (ECMA-262, section 7.6.1.2). */ \ |
| T(FUTURE_STRICT_RESERVED_WORD, nullptr, 0) \ |
| T(ESCAPED_STRICT_RESERVED_WORD, nullptr, 0) \ |
| /* END AnyIdentifier */ \ |
| /* END Callable */ \ |
| K(ENUM, "enum", 0) \ |
| K(CLASS, "class", 0) \ |
| K(CONST, "const", 0) \ |
| K(EXPORT, "export", 0) \ |
| K(EXTENDS, "extends", 0) \ |
| K(IMPORT, "import", 0) \ |
| T(PRIVATE_NAME, nullptr, 0) \ |
| \ |
| /* Illegal token - not able to scan. */ \ |
| T(ILLEGAL, "ILLEGAL", 0) \ |
| T(ESCAPED_KEYWORD, nullptr, 0) \ |
| \ |
| /* Scanner-internal use only. */ \ |
| T(WHITESPACE, nullptr, 0) \ |
| T(UNINITIALIZED, nullptr, 0) \ |
| T(REGEXP_LITERAL, nullptr, 0) |
| |
| class V8_EXPORT_PRIVATE Token { |
| public: |
| // All token values. |
| #define T(name, string, precedence) name, |
| enum Value : uint8_t { 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 token) { |
| DCHECK_GT(NUM_TOKENS, token); // token is unsigned |
| return name_[token]; |
| } |
| |
| using IsKeywordBits = base::BitField8<bool, 0, 1>; |
| using IsPropertyNameBits = IsKeywordBits::Next<bool, 1>; |
| |
| // Predicates |
| static bool IsKeyword(Value token) { |
| return IsKeywordBits::decode(token_flags[token]); |
| } |
| |
| static bool IsPropertyName(Value token) { |
| return IsPropertyNameBits::decode(token_flags[token]); |
| } |
| |
| V8_INLINE static bool IsValidIdentifier(Value token, |
| LanguageMode language_mode, |
| bool is_generator, |
| bool disallow_await) { |
| if (V8_LIKELY(base::IsInRange(token, IDENTIFIER, ASYNC))) return true; |
| if (token == AWAIT) return !disallow_await; |
| if (token == YIELD) return !is_generator && is_sloppy(language_mode); |
| return IsStrictReservedWord(token) && is_sloppy(language_mode); |
| } |
| |
| static bool IsCallable(Value token) { |
| return base::IsInRange(token, SUPER, ESCAPED_STRICT_RESERVED_WORD); |
| } |
| |
| static bool IsAutoSemicolon(Value token) { |
| return base::IsInRange(token, SEMICOLON, EOS); |
| } |
| |
| static bool IsAnyIdentifier(Value token) { |
| return base::IsInRange(token, IDENTIFIER, ESCAPED_STRICT_RESERVED_WORD); |
| } |
| |
| static bool IsStrictReservedWord(Value token) { |
| return base::IsInRange(token, YIELD, ESCAPED_STRICT_RESERVED_WORD); |
| } |
| |
| static bool IsLiteral(Value token) { |
| return base::IsInRange(token, NULL_LITERAL, STRING); |
| } |
| |
| static bool IsTemplate(Value token) { |
| return base::IsInRange(token, TEMPLATE_SPAN, TEMPLATE_TAIL); |
| } |
| |
| static bool IsMember(Value token) { |
| return base::IsInRange(token, TEMPLATE_SPAN, LBRACK); |
| } |
| |
| static bool IsProperty(Value token) { |
| return base::IsInRange(token, PERIOD, LBRACK); |
| } |
| |
| static bool IsPropertyOrCall(Value token) { |
| return base::IsInRange(token, TEMPLATE_SPAN, LPAREN); |
| } |
| |
| static bool IsArrowOrAssignmentOp(Value token) { |
| return base::IsInRange(token, ARROW, ASSIGN_SUB); |
| } |
| |
| static bool IsAssignmentOp(Value token) { |
| return base::IsInRange(token, INIT, ASSIGN_SUB); |
| } |
| |
| static bool IsLogicalAssignmentOp(Value token) { |
| return base::IsInRange(token, ASSIGN_NULLISH, ASSIGN_AND); |
| } |
| |
| static bool IsBinaryOp(Value op) { return base::IsInRange(op, COMMA, SUB); } |
| |
| static bool IsCompareOp(Value op) { return base::IsInRange(op, EQ, IN); } |
| |
| static bool IsOrderedRelationalCompareOp(Value op) { |
| return base::IsInRange(op, LT, GTE); |
| } |
| |
| static bool IsEqualityOp(Value op) { |
| return base::IsInRange(op, EQ, EQ_STRICT); |
| } |
| |
| static Value BinaryOpForAssignment(Value op) { |
| DCHECK(base::IsInRange(op, ASSIGN_NULLISH, ASSIGN_SUB)); |
| Value result = static_cast<Value>(op - ASSIGN_NULLISH + NULLISH); |
| DCHECK(IsBinaryOp(result)); |
| return result; |
| } |
| |
| static bool IsBitOp(Value op) { |
| return base::IsInRange(op, BIT_OR, SHR) || op == BIT_NOT; |
| } |
| |
| static bool IsUnaryOp(Value op) { return base::IsInRange(op, ADD, VOID); } |
| static bool IsCountOp(Value op) { return base::IsInRange(op, INC, DEC); } |
| static bool IsUnaryOrCountOp(Value op) { |
| return base::IsInRange(op, ADD, DEC); |
| } |
| static bool IsShiftOp(Value op) { return base::IsInRange(op, SHL, SHR); } |
| |
| // Returns a string corresponding to the JS token string |
| // (.e., "<" for the token LT) or nullptr if the token doesn't |
| // have a (unique) string (e.g. an IDENTIFIER). |
| static const char* String(Value token) { |
| DCHECK_GT(NUM_TOKENS, token); // token is unsigned |
| return string_[token]; |
| } |
| |
| static uint8_t StringLength(Value token) { |
| DCHECK_GT(NUM_TOKENS, token); // token is unsigned |
| return string_length_[token]; |
| } |
| |
| // Returns the precedence > 0 for binary and compare |
| // operators; returns 0 otherwise. |
| static int Precedence(Value token, bool accept_IN) { |
| DCHECK_GT(NUM_TOKENS, token); // token is unsigned |
| return precedence_[accept_IN][token]; |
| } |
| |
| private: |
| static const char* const name_[NUM_TOKENS]; |
| static const char* const string_[NUM_TOKENS]; |
| static const uint8_t string_length_[NUM_TOKENS]; |
| static const int8_t precedence_[2][NUM_TOKENS]; |
| static const uint8_t token_flags[NUM_TOKENS]; |
| }; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_PARSING_TOKEN_H_ |
