GCC主要数据结构之TTYPE_TABLE

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最新推荐文章于 2024-06-09 15:18:03 发布

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分类专栏：编译器研究学习

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本文详细介绍了C预处理器(cpplib)中各种操作符的定义及其分类，包括比较操作符、数学运算符、位操作符、逻辑操作符等，并解释了它们在预处理器表达式中的作用及其实现方式。

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cpplib.h

/* The first three groups, apart from '=', can appear in preprocessor
   expressions (+= and -= are used to indicate unary + and - resp.).
   This allows a lookup table to be implemented in _cpp_parse_expr.
   The first group, to CPP_LAST_EQ, can be immediately followed by an
   '='.  The lexer needs operators ending in '=', like ">>=", to be in
   the same order as their counterparts without the '=', like ">>".
   See the cpp_operator table optab in expr.c if you change the order or
   add or remove anything in the first group.  */
#define TTYPE_TABLE       \
  OP(EQ,  "=")      \
  OP(NOT,  "!")      \
  OP(GREATER,  ">") /* compare */    \
  OP(LESS,  "<")      \
  OP(PLUS,  "+") /* math */    \
  OP(MINUS,  "-")      \
  OP(MULT,  "*")      \
  OP(DIV,  "/")      \
  OP(MOD,  "%")      \
  OP(AND,  "&") /* bit ops */    \
  OP(OR,  "|")      \
  OP(XOR,  "^")      \
  OP(RSHIFT,  ">>")      \
  OP(LSHIFT,  "<<")      \
         \
  OP(COMPL,  "~")      \
  OP(AND_AND,  "&&") /* logical */    \
  OP(OR_OR,  "||")      \
  OP(QUERY,  "?")      \
  OP(COLON,  ":")      \
  OP(COMMA,  ",") /* grouping */    \
  OP(OPEN_PAREN, "(")      \
  OP(CLOSE_PAREN, ")")      \
  TK(EOF,  NONE)      \
  OP(EQ_EQ,  "==") /* compare */    \
  OP(NOT_EQ,  "!=")      \
  OP(GREATER_EQ, ">=")      \
  OP(LESS_EQ,  "<=")      \
         \
  /* These two are unary + / - in preprocessor expressions.  */  \
  OP(PLUS_EQ,  "+=") /* math */    \
  OP(MINUS_EQ,  "-=")      \
         \
  OP(MULT_EQ,  "*=")      \
  OP(DIV_EQ,  "/=")      \
  OP(MOD_EQ,  "%=")      \
  OP(AND_EQ,  "&=") /* bit ops */    \
  OP(OR_EQ,  "|=")      \
  OP(XOR_EQ,  "^=")      \
  OP(RSHIFT_EQ,  ">>=")      \
  OP(LSHIFT_EQ,  "<<=")      \
  /* Digraphs together, beginning with CPP_FIRST_DIGRAPH.  */  \
  OP(HASH,  "#") /* digraphs */    \
  OP(PASTE,  "##")      \
  OP(OPEN_SQUARE, "[")      \
  OP(CLOSE_SQUARE, "]")      \
  OP(OPEN_BRACE, "{")      \
  OP(CLOSE_BRACE, "}")      \
  /* The remainder of the punctuation. Order is not significant.  */ \
  OP(SEMICOLON,  ";") /* structure */    \
  OP(ELLIPSIS,  "...")      \
  OP(PLUS_PLUS,  "++") /* increment */    \
  OP(MINUS_MINUS, "--")      \
  OP(DEREF,  "->") /* accessors */    \
  OP(DOT,  ".")      \
  OP(SCOPE,  "::")      \
  OP(DEREF_STAR, "->*")      \
  OP(DOT_STAR,  ".*")      \
  OP(ATSIGN,  "@")  /* used in Objective-C */   \
         \
  TK(NAME,  IDENT)  /* word */    \
  TK(AT_NAME,  IDENT)  /* @word - Objective-C */  \
  TK(NUMBER,  LITERAL) /* 34_be+ta  */   \
         \
  TK(CHAR,  LITERAL) /* 'char' */    \
  TK(WCHAR,  LITERAL) /* L'char' */    \
  TK(CHAR16,  LITERAL) /* u'char' */    \
  TK(CHAR32,  LITERAL) /* U'char' */    \
  TK(UTF8CHAR,  LITERAL) /* u8'char' */    \
  TK(OTHER,  LITERAL) /* stray punctuation */  \
         \
  TK(STRING,  LITERAL) /* "string" */    \
  TK(WSTRING,  LITERAL) /* L"string" */   \
  TK(STRING16,  LITERAL) /* u"string" */   \
  TK(STRING32,  LITERAL) /* U"string" */   \
  TK(UTF8STRING, LITERAL) /* u8"string" */   \
  TK(OBJC_STRING, LITERAL) /* @"string" - Objective-C */  \
  TK(HEADER_NAME, LITERAL) /* <stdio.h> in #include */  \
         \
  TK(CHAR_USERDEF, LITERAL) /* 'char'_suffix - C++-0x */  \
  TK(WCHAR_USERDEF, LITERAL) /* L'char'_suffix - C++-0x */  \
  TK(CHAR16_USERDEF, LITERAL) /* u'char'_suffix - C++-0x */  \
  TK(CHAR32_USERDEF, LITERAL) /* U'char'_suffix - C++-0x */  \
  TK(UTF8CHAR_USERDEF, LITERAL) /* u8'char'_suffix - C++-0x */  \
  TK(STRING_USERDEF, LITERAL) /* "string"_suffix - C++-0x */  \
  TK(WSTRING_USERDEF, LITERAL) /* L"string"_suffix - C++-0x */ \
  TK(STRING16_USERDEF, LITERAL) /* u"string"_suffix - C++-0x */ \
  TK(STRING32_USERDEF, LITERAL) /* U"string"_suffix - C++-0x */ \
  TK(UTF8STRING_USERDEF,LITERAL) /* u8"string"_suffix - C++-0x */ \
         \
  TK(COMMENT,  LITERAL) /* Only if output comments.  */ \
     /* SPELL_LITERAL happens to DTRT.  */ \
  TK(MACRO_ARG,  NONE)  /* Macro argument.  */   \
  TK(PRAGMA,  NONE)  /* Only for deferred pragmas.  */ \
  TK(PRAGMA_EOL, NONE)  /* End-of-line for deferred pragmas.  */ \
  TK(PADDING,  NONE)  /* Whitespace for -E. */