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dart / sdk.git / 39d930305c40b3a33ef73360d2232e3be7dcaba8 / . / runtime / vm / token.h
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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_TOKEN_H_
#define RUNTIME_VM_TOKEN_H_
#include "platform/assert.h"
#include "vm/allocation.h"
namespace dart {
// Operator precedence table
//
// 14 multiplicative * / ~/ %
// 13 additive + -
// 12 shift << >> >>>
// 11 bitwise and &
// 10 bitwise xor ^
// 9 bitwise or |
// 8 relational >= > <= < is as
// 7 equality == != === !==
// 6 logical and &&
// 5 logical or ||
// 4 null check ??
// 3 conditional ?
// 2 assignment = *= /= ~/= %= += -= <<= >>= >>>= &= ^= |= ??=
// 1 comma ,
// Token definitions.
// Some operator tokens appear in blocks, e.g. assignment operators.
// There is code that depends on the values within a block to be
// contiguous, and on the order of values.
#define DART_TOKEN_LIST(TOK) \
TOK(kEOS, "", 0, kNoAttribute) \
\
TOK(kLPAREN, "(", 0, kNoAttribute) \
TOK(kRPAREN, ")", 0, kNoAttribute) \
TOK(kLBRACK, "[", 0, kNoAttribute) \
TOK(kRBRACK, "]", 0, kNoAttribute) \
TOK(kLBRACE, "{", 0, kNoAttribute) \
TOK(kRBRACE, "}", 0, kNoAttribute) \
TOK(kARROW, "=>", 0, kNoAttribute) \
TOK(kCOLON, ":", 0, kNoAttribute) \
TOK(kSEMICOLON, ";", 0, kNoAttribute) \
TOK(kPERIOD, ".", 0, kNoAttribute) \
TOK(kQM_PERIOD, "?.", 0, kNoAttribute) \
TOK(kINCR, "++", 0, kNoAttribute) \
TOK(kDECR, "--", 0, kNoAttribute) \
\
/* Assignment operators. */ \
/* Please update IsAssignmentOperator() if you make */ \
/* any changes to this block. */ \
TOK(kASSIGN, "=", 2, kNoAttribute) \
TOK(kASSIGN_OR, "|=", 2, kNoAttribute) \
TOK(kASSIGN_XOR, "^=", 2, kNoAttribute) \
TOK(kASSIGN_AND, "&=", 2, kNoAttribute) \
TOK(kASSIGN_SHL, "<<=", 2, kNoAttribute) \
TOK(kASSIGN_SHR, ">>=", 2, kNoAttribute) \
TOK(kASSIGN_USHR, ">>>=", 2, kNoAttribute) \
TOK(kASSIGN_ADD, "+=", 2, kNoAttribute) \
TOK(kASSIGN_SUB, "-=", 2, kNoAttribute) \
TOK(kASSIGN_MUL, "*=", 2, kNoAttribute) \
TOK(kASSIGN_TRUNCDIV, "~/=", 2, kNoAttribute) \
TOK(kASSIGN_DIV, "/=", 2, kNoAttribute) \
TOK(kASSIGN_MOD, "%=", 2, kNoAttribute) \
/* Avoid trigraph ??= below. */ \
TOK(kASSIGN_COND, "?\?=", 2, kNoAttribute) \
\
TOK(kCASCADE, "..", 2, kNoAttribute) \
\
TOK(kCOMMA, ",", 1, kNoAttribute) \
TOK(kOR, "||", 5, kNoAttribute) \
TOK(kAND, "&&", 6, kNoAttribute) \
TOK(kBIT_OR, "|", 9, kNoAttribute) \
TOK(kBIT_XOR, "^", 10, kNoAttribute) \
TOK(kBIT_AND, "&", 11, kNoAttribute) \
TOK(kBIT_NOT, "~", 0, kNoAttribute) \
\
/* Shift operators. */ \
TOK(kSHL, "<<", 12, kNoAttribute) \
TOK(kSHR, ">>", 12, kNoAttribute) \
TOK(kUSHR, ">>>", 12, kNoAttribute) \
\
/* Additive operators. */ \
TOK(kADD, "+", 13, kNoAttribute) \
TOK(kSUB, "-", 13, kNoAttribute) \
\
/* Multiplicative operators */ \
TOK(kMUL, "*", 14, kNoAttribute) \
TOK(kDIV, "/", 14, kNoAttribute) \
TOK(kTRUNCDIV, "~/", 14, kNoAttribute) \
TOK(kMOD, "%", 14, kNoAttribute) \
\
TOK(kNOT, "!", 0, kNoAttribute) \
TOK(kCONDITIONAL, "?", 3, kNoAttribute) \
TOK(kIFNULL, "??", 4, kNoAttribute) \
\
/* Equality operators. */ \
/* Please update IsEqualityOperator() if you make */ \
/* any changes to this block. */ \
TOK(kEQ, "==", 7, kNoAttribute) \
TOK(kNE, "!=", 7, kNoAttribute) \
TOK(kEQ_STRICT, "===", 7, kNoAttribute) \
TOK(kNE_STRICT, "!==", 7, kNoAttribute) \
\
/* Relational operators. */ \
/* Please update IsRelationalOperator() if you make */ \
/* any changes to this block. */ \
TOK(kLT, "<", 8, kNoAttribute) \
TOK(kGT, ">", 8, kNoAttribute) \
TOK(kLTE, "<=", 8, kNoAttribute) \
TOK(kGTE, ">=", 8, kNoAttribute) \
\
/* Internal token for !(expr is Type) negative type test operator */ \
TOK(kISNOT, "", 11, kNoAttribute) \
\
TOK(kINDEX, "[]", 0, kNoAttribute) \
TOK(kASSIGN_INDEX, "[]=", 0, kNoAttribute) \
TOK(kNEGATE, "unary-", 0, kNoAttribute) \
\
TOK(kIDENT, "", 0, kNoAttribute) \
TOK(kSTRING, "", 0, kNoAttribute) \
TOK(kINTEGER, "", 0, kNoAttribute) \
TOK(kDOUBLE, "", 0, kNoAttribute) \
\
TOK(kINTERPOL_VAR, "$", 0, kNoAttribute) \
TOK(kINTERPOL_START, "${", 0, kNoAttribute) \
TOK(kINTERPOL_END, "}", 0, kNoAttribute) \
\
TOK(kAT, "@", 0, kNoAttribute) \
TOK(kHASH, "#", 0, kNoAttribute) \
\
TOK(kNEWLINE, "\n", 0, kNoAttribute) \
TOK(kWHITESP, "", 0, kNoAttribute) \
TOK(kERROR, "", 0, kNoAttribute) \
TOK(kILLEGAL, "", 0, kNoAttribute) \
\
/* Support for Dart scripts. */ \
TOK(kSCRIPTTAG, "#!", 0, kNoAttribute) \
\
/* Support for optimized code */ \
TOK(kREM, "", 0, kNoAttribute)
// List of keywords. The list must be alphabetically ordered. The
// keyword recognition code depends on the ordering.
// If you add a keyword at the beginning or end of this list, make sure
// to update kFirstKeyword and kLastKeyword below.
#define DART_KEYWORD_LIST(KW) \
KW(kABSTRACT, "abstract", 0, kPseudoKeyword) /* == kFirstKeyword */ \
KW(kAS, "as", 11, kPseudoKeyword) \
KW(kASSERT, "assert", 0, kKeyword) \
KW(kBREAK, "break", 0, kKeyword) \
KW(kCASE, "case", 0, kKeyword) \
KW(kCATCH, "catch", 0, kKeyword) \
KW(kCLASS, "class", 0, kKeyword) \
KW(kCONST, "const", 0, kKeyword) \
KW(kCONTINUE, "continue", 0, kKeyword) \
KW(kCOVARIANT, "covariant", 0, kPseudoKeyword) \
KW(kDEFAULT, "default", 0, kKeyword) \
KW(kDEFERRED, "deferred", 0, kPseudoKeyword) \
KW(kDO, "do", 0, kKeyword) \
KW(kELSE, "else", 0, kKeyword) \
KW(kENUM, "enum", 0, kKeyword) \
KW(kEXPORT, "export", 0, kPseudoKeyword) \
KW(kEXTENDS, "extends", 0, kKeyword) \
KW(kEXTERNAL, "external", 0, kPseudoKeyword) \
KW(kFACTORY, "factory", 0, kPseudoKeyword) \
KW(kFALSE, "false", 0, kKeyword) \
KW(kFINAL, "final", 0, kKeyword) \
KW(kFINALLY, "finally", 0, kKeyword) \
KW(kFOR, "for", 0, kKeyword) \
KW(kGET, "get", 0, kPseudoKeyword) \
KW(kIF, "if", 0, kKeyword) \
KW(kIMPLEMENTS, "implements", 0, kPseudoKeyword) \
KW(kIMPORT, "import", 0, kPseudoKeyword) \
KW(kIN, "in", 0, kKeyword) \
KW(kIS, "is", 11, kKeyword) \
KW(kLIBRARY, "library", 0, kPseudoKeyword) \
KW(kNEW, "new", 0, kKeyword) \
KW(kNULL, "null", 0, kKeyword) \
KW(kOPERATOR, "operator", 0, kPseudoKeyword) \
KW(kPART, "part", 0, kPseudoKeyword) \
KW(kRETHROW, "rethrow", 0, kKeyword) \
KW(kRETURN, "return", 0, kKeyword) \
KW(kSET, "set", 0, kPseudoKeyword) \
KW(kSTATIC, "static", 0, kPseudoKeyword) \
KW(kSUPER, "super", 0, kKeyword) \
KW(kSWITCH, "switch", 0, kKeyword) \
KW(kTHIS, "this", 0, kKeyword) \
KW(kTHROW, "throw", 0, kKeyword) \
KW(kTRUE, "true", 0, kKeyword) \
KW(kTRY, "try", 0, kKeyword) \
KW(kTYPEDEF, "typedef", 0, kPseudoKeyword) \
KW(kVAR, "var", 0, kKeyword) \
KW(kVOID, "void", 0, kKeyword) \
KW(kWHILE, "while", 0, kKeyword) \
KW(kWITH, "with", 0, kKeyword) /* == kLastKeyword */
class String;
class Token {
public:
#define T(t, s, p, a) t,
enum Kind { DART_TOKEN_LIST(T) DART_KEYWORD_LIST(T) kNumTokens };
#undef T
enum Attribute {
kNoAttribute = 0,
kKeyword = 1 << 0,
kPseudoKeyword = 1 << 1,
};
static const Kind kFirstKeyword = kABSTRACT;
static const Kind kLastKeyword = kWITH;
static const int kNumKeywords = kLastKeyword - kFirstKeyword + 1;
static bool IsAssignmentOperator(Kind tok) {
return kASSIGN <= tok && tok <= kASSIGN_COND;
}
static bool IsRelationalOperator(Kind tok) {
return kLT <= tok && tok <= kGTE;
}
static bool IsEqualityOperator(Kind tok) {
return kEQ <= tok && tok <= kNE_STRICT;
}
static bool IsStrictEqualityOperator(Kind tok) {
return (tok == kEQ_STRICT) || (tok == kNE_STRICT);
}
static bool IsTypeTestOperator(Kind tok) {
return (tok == kIS) || (tok == kISNOT);
}
static bool IsTypeCastOperator(Kind tok) { return tok == kAS; }
static bool IsIndexOperator(Kind tok) {
return tok == kINDEX || tok == kASSIGN_INDEX;
}
static bool IsPseudoKeyword(Kind tok) {
return (Attributes(tok) & kPseudoKeyword) != 0;
}
static bool IsKeyword(Kind tok) { return (Attributes(tok) & kKeyword) != 0; }
static bool IsIdentifier(Kind tok) {
return (tok == kIDENT) || IsPseudoKeyword(tok);
}
static const char* Name(Kind tok) {
ASSERT(tok < kNumTokens);
return name_[tok];
}
static const char* Str(Kind tok) {
ASSERT(tok < kNumTokens);
return tok_str_[tok];
}
static bool FromStr(const char* str, Kind* out) {
ASSERT(str != nullptr && out != nullptr);
#define TOK_CASE(t, s, p, a) \
if (strcmp(str, tok_str_[(t)]) == 0) { \
*out = (t); \
return true; \
}
DART_TOKEN_LIST(TOK_CASE)
DART_KEYWORD_LIST(TOK_CASE)
#undef TOK_CASE
return false;
}
static int Precedence(Kind tok) {
ASSERT(tok < kNumTokens);
return precedence_[tok];
}
static Attribute Attributes(Kind tok) {
ASSERT(tok < kNumTokens);
return attributes_[tok];
}
static bool CanBeOverloaded(Kind tok) {
ASSERT(tok < kNumTokens);
return IsRelationalOperator(tok) || (tok == kEQ) ||
(tok >= kADD && tok <= kMOD) || // Arithmetic operations.
(tok >= kBIT_OR && tok <= kUSHR) || // Bit operations.
(tok == kINDEX) || (tok == kASSIGN_INDEX);
}
static bool NeedsLiteralToken(Kind tok) {
ASSERT(tok < kNumTokens);
return ((tok == Token::kINTEGER) || (tok == Token::kSTRING) ||
(tok == Token::kINTERPOL_VAR) || (tok == Token::kERROR) ||
(tok == Token::kDOUBLE));
}
static bool IsBinaryOperator(Token::Kind token);
static bool IsUnaryOperator(Token::Kind token);
static bool IsBinaryArithmeticOperator(Token::Kind token);
static bool IsUnaryArithmeticOperator(Token::Kind token);
static bool IsBinaryBitwiseOperator(Token::Kind token);
// For a comparison operation return an operation for the negated comparison:
// !(a (op) b) === a (op') b
static Token::Kind NegateComparison(Token::Kind op) {
switch (op) {
case Token::kEQ:
return Token::kNE;
case Token::kNE:
return Token::kEQ;
case Token::kLT:
return Token::kGTE;
case Token::kGT:
return Token::kLTE;
case Token::kLTE:
return Token::kGT;
case Token::kGTE:
return Token::kLT;
case Token::kEQ_STRICT:
return Token::kNE_STRICT;
case Token::kNE_STRICT:
return Token::kEQ_STRICT;
case Token::kIS:
return Token::kISNOT;
case Token::kISNOT:
return Token::kIS;
default:
UNREACHABLE();
return Token::kILLEGAL;
}
}
// For a comparison operation return an operation for the equivalent flipped
// comparison: a (op) b === b (op') a.
static Token::Kind FlipComparison(Token::Kind op) {
switch (op) {
case Token::kEQ:
return Token::kEQ;
case Token::kNE:
return Token::kNE;
case Token::kLT:
return Token::kGT;
case Token::kGT:
return Token::kLT;
case Token::kLTE:
return Token::kGTE;
case Token::kGTE:
return Token::kLTE;
case Token::kEQ_STRICT:
return Token::kEQ_STRICT;
case Token::kNE_STRICT:
return Token::kNE_STRICT;
default:
UNREACHABLE();
return Token::kILLEGAL;
}
}
private:
static const char* const name_[];
static const char* const tok_str_[];
static const uint8_t precedence_[];
static const Attribute attributes_[];
};
} // namespace dart
#endif // RUNTIME_VM_TOKEN_H_