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token.h
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token.h
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// 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). */ \
/* TODO(rezvan): Add remaining contextual keywords (meta, target, as, from) \
* to tokens. */ \
T(IDENTIFIER, nullptr, 0) \
K(GET, "get", 0) \
K(SET, "set", 0) \
K(USING, "using", 0) \
K(OF, "of", 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_