65ae6e92ab
BUG=v8:3330 LOG=N R=arv@chromium.org, marja@chromium.org Review URL: https://codereview.chromium.org/480543002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23157 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
295 lines
13 KiB
C++
295 lines
13 KiB
C++
// 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/base/logging.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) \
|
|
T(ARROW, "=>", 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) \
|
|
K(SUPER, "super", 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) {
|
|
DCHECK(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) {
|
|
DCHECK(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) {
|
|
DCHECK(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) {
|
|
DCHECK(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) {
|
|
DCHECK(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_
|