cpplib.h

gcc库的原代码,对编程有很大帮助.

  char objc;

  /* Nonzero means this is an assembly file, and allow
     unknown directives, which could be comments.  */

  int lang_asm;

  /* Nonzero means turn NOTREACHED into #pragma NOTREACHED etc */

  char for_lint;

  /* Nonzero means handle CHILL comment syntax
     and output CHILL string delimiter for __DATE___ etc. */

  char chill;

  /* Nonzero means copy comments into the output file.  */

  char put_out_comments;

  /* Nonzero means don't process the ANSI trigraph sequences.  */

  char no_trigraphs;

  /* Nonzero means print the names of included files rather than
     the preprocessed output.  1 means just the #include "...",
     2 means #include <...> as well.  */

  char print_deps;

  /* Nonzero if missing .h files in -M output are assumed to be generated
     files and not errors.  */

  char print_deps_missing_files;

  /* If true, fopen (deps_file, "a") else fopen (deps_file, "w"). */
  char print_deps_append;

  /* Nonzero means print names of header files (-H).  */

  char print_include_names;

  /* Nonzero means try to make failure to fit ANSI C an error.  */

  char pedantic_errors;

  /* Nonzero means don't print warning messages.  -w.  */

  char inhibit_warnings;

  /* Nonzero means warn if slash-star appears in a comment.  */

  char warn_comments;

  /* Nonzero means warn if there are any trigraphs.  */

  char warn_trigraphs;

  /* Nonzero means warn if #import is used.  */

  char warn_import;

  /* Nonzero means warn if a macro argument is (or would be)
     stringified with -traditional.  */

  char warn_stringify;

  /* Nonzero means turn warnings into errors.  */

  char warnings_are_errors;

  /* Nonzero causes output not to be done,
     but directives such as #define that have side effects
     are still obeyed.  */

  char no_output;

  /* Nonzero means don't output line number information.  */

  char no_line_commands;

/* Nonzero means output the text in failing conditionals,
   inside #failed ... #endfailed.  */

  char output_conditionals;

  /* Nonzero means -I- has been seen,
     so don't look for #include "foo" the source-file directory.  */
  char ignore_srcdir;

/* Zero means dollar signs are punctuation.
   -$ stores 0; -traditional may store 1.  Default is 1 for VMS, 0 otherwise.
   This must be 0 for correct processing of this ANSI C program:
	#define foo(a) #a
	#define lose(b) foo (b)
	#define test$
	lose (test)	*/
  char dollars_in_ident;
#ifndef DOLLARS_IN_IDENTIFIERS
#define DOLLARS_IN_IDENTIFIERS 1
#endif

  /* Nonzero means try to imitate old fashioned non-ANSI preprocessor.  */
  char traditional;

  /* Nonzero means give all the error messages the ANSI standard requires.  */
  char pedantic;

  char done_initializing;

  struct file_name_list *include;	/* First dir to search */
  /* First dir to search for <file> */
  /* This is the first element to use for #include <...>.
     If it is 0, use the entire chain for such includes.  */
  struct file_name_list *first_bracket_include;
  /* This is the first element in the chain that corresponds to
     a directory of system header files.  */
  struct file_name_list *first_system_include;
  struct file_name_list *last_include;	/* Last in chain */

  /* Chain of include directories to put at the end of the other chain.  */
  struct file_name_list *after_include;
  struct file_name_list *last_after_include;	/* Last in chain */

  /* Chain to put at the start of the system include files.  */
  struct file_name_list *before_system;
  struct file_name_list *last_before_system;	/* Last in chain */

  /* Directory prefix that should replace `/usr' in the standard
     include file directories.  */
  char *include_prefix;

  char inhibit_predefs;
  char no_standard_includes;
  char no_standard_cplusplus_includes;

/* dump_only means inhibit output of the preprocessed text
             and instead output the definitions of all user-defined
             macros in a form suitable for use as input to cccp.
   dump_names means pass #define and the macro name through to output.
   dump_definitions means pass the whole definition (plus #define) through
*/

  enum {dump_none = 0, dump_only, dump_names, dump_definitions}
     dump_macros;

/* Nonzero means pass all #define and #undef directives which we actually
   process through to the output stream.  This feature is used primarily
   to allow cc1 to record the #defines and #undefs for the sake of
   debuggers which understand about preprocessor macros, but it may
   also be useful with -E to figure out how symbols are defined, and
   where they are defined.  */
  int debug_output;

  /* Pending -D, -U and -A options, in reverse order. */
  struct cpp_pending *pending;

  /* File name which deps are being written to.
     This is 0 if deps are being written to stdout.  */
  char *deps_file;

  /* Target-name to write with the dependency information.  */
  char *deps_target;
};

#define CPP_TRADITIONAL(PFILE) (CPP_OPTIONS(PFILE)-> traditional)
#define CPP_PEDANTIC(PFILE) (CPP_OPTIONS (PFILE)->pedantic)
#define CPP_PRINT_DEPS(PFILE) (CPP_OPTIONS (PFILE)->print_deps)

/* Name under which this program was invoked.  */

extern char *progname;

/* The structure of a node in the hash table.  The hash table
   has entries for all tokens defined by #define commands (type T_MACRO),
   plus some special tokens like __LINE__ (these each have their own
   type, and the appropriate code is run when that type of node is seen.
   It does not contain control words like "#define", which are recognized
   by a separate piece of code. */

/* different flavors of hash nodes --- also used in keyword table */
enum node_type {
 T_DEFINE = 1,	/* the `#define' keyword */
 T_INCLUDE,	/* the `#include' keyword */
 T_INCLUDE_NEXT, /* the `#include_next' keyword */
 T_IMPORT,      /* the `#import' keyword */
 T_IFDEF,	/* the `#ifdef' keyword */
 T_IFNDEF,	/* the `#ifndef' keyword */
 T_IF,		/* the `#if' keyword */
 T_ELSE,	/* `#else' */
 T_PRAGMA,	/* `#pragma' */
 T_ELIF,	/* `#elif' */
 T_UNDEF,	/* `#undef' */
 T_LINE,	/* `#line' */
 T_ERROR,	/* `#error' */
 T_WARNING,	/* `#warning' */
 T_ENDIF,	/* `#endif' */
 T_SCCS,	/* `#sccs', used on system V.  */
 T_IDENT,	/* `#ident', used on system V.  */
 T_ASSERT,	/* `#assert', taken from system V.  */
 T_UNASSERT,	/* `#unassert', taken from system V.  */
 T_SPECLINE,	/* special symbol `__LINE__' */
 T_DATE,	/* `__DATE__' */
 T_FILE,	/* `__FILE__' */
 T_BASE_FILE,	/* `__BASE_FILE__' */
 T_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
 T_VERSION,	/* `__VERSION__' */
 T_SIZE_TYPE,   /* `__SIZE_TYPE__' */
 T_PTRDIFF_TYPE,   /* `__PTRDIFF_TYPE__' */
 T_WCHAR_TYPE,   /* `__WCHAR_TYPE__' */
 T_USER_LABEL_PREFIX_TYPE, /* `__USER_LABEL_PREFIX__' */
 T_REGISTER_PREFIX_TYPE,   /* `__REGISTER_PREFIX__' */
 T_TIME,	/* `__TIME__' */
 T_CONST,	/* Constant value, used by `__STDC__' */
 T_MACRO,	/* macro defined by `#define' */
 T_DISABLED,	/* macro temporarily turned off for rescan */
 T_SPEC_DEFINED, /* special `defined' macro for use in #if statements */
 T_PCSTRING,	/* precompiled string (hashval is KEYDEF *) */
 T_UNUSED	/* Used for something not defined.  */
 };

/* Structure returned by create_definition */
typedef struct macrodef MACRODEF;
struct macrodef
{
  struct definition *defn;
  U_CHAR *symnam;
  int symlen;
};

/* Structure allocated for every #define.  For a simple replacement
   such as
   	#define foo bar ,
   nargs = -1, the `pattern' list is null, and the expansion is just
   the replacement text.  Nargs = 0 means a functionlike macro with no args,
   e.g.,
       #define getchar() getc (stdin) .
   When there are args, the expansion is the replacement text with the
   args squashed out, and the reflist is a list describing how to
   build the output from the input: e.g., "3 chars, then the 1st arg,
   then 9 chars, then the 3rd arg, then 0 chars, then the 2nd arg".
   The chars here come from the expansion.  Whatever is left of the
   expansion after the last arg-occurrence is copied after that arg.
   Note that the reflist can be arbitrarily long---
   its length depends on the number of times the arguments appear in
   the replacement text, not how many args there are.  Example:
   #define f(x) x+x+x+x+x+x+x would have replacement text "++++++" and
   pattern list
     { (0, 1), (1, 1), (1, 1), ..., (1, 1), NULL }
   where (x, y) means (nchars, argno). */

typedef struct definition DEFINITION;
struct definition {
  int nargs;
  int length;			/* length of expansion string */
  int predefined;		/* True if the macro was builtin or */
				/* came from the command line */
  U_CHAR *expansion;
  int line;			/* Line number of definition */
  char *file;			/* File of definition */
  char rest_args;		/* Nonzero if last arg. absorbs the rest */
  struct reflist {
    struct reflist *next;
    char stringify;		/* nonzero if this arg was preceded by a
				   # operator. */
    char raw_before;		/* Nonzero if a ## operator before arg. */
    char raw_after;		/* Nonzero if a ## operator after arg. */
    char rest_args;		/* Nonzero if this arg. absorbs the rest */
    int nchars;			/* Number of literal chars to copy before
				   this arg occurrence.  */
    int argno;			/* Number of arg to substitute (origin-0) */
  } *pattern;
  union {
    /* Names of macro args, concatenated in reverse order
       with comma-space between them.
       The only use of this is that we warn on redefinition
       if this differs between the old and new definitions.  */
    U_CHAR *argnames;
  } args;
};

extern U_CHAR is_idchar[256];

/* Stack of conditionals currently in progress
   (including both successful and failing conditionals).  */

struct if_stack {
  struct if_stack *next;	/* for chaining to the next stack frame */
  char *fname;		/* copied from input when frame is made */
  int lineno;			/* similarly */
  int if_succeeded;		/* true if a leg of this if-group
				    has been passed through rescan */
  U_CHAR *control_macro;	/* For #ifndef at start of file,
				   this is the macro name tested.  */
  enum node_type type;		/* type of last directive seen in this group */
};
typedef struct if_stack IF_STACK_FRAME;

extern void cpp_buf_line_and_col PARAMS((cpp_buffer*, long*, long*));
extern cpp_buffer* cpp_file_buffer PARAMS((cpp_reader*));
extern void cpp_define PARAMS ((cpp_reader*, U_CHAR*));

extern void cpp_error ();
extern void cpp_warning ();
extern void cpp_pedwarn ();
extern void cpp_error_with_line ();
extern void cpp_pedwarn_with_line ();
extern void cpp_pedwarn_with_file_and_line ();
extern void fatal ();
extern void cpp_error_from_errno ();
extern void cpp_perror_with_name ();
extern void cpp_pfatal_with_name ();

extern void cpp_grow_buffer PARAMS ((cpp_reader*, long));
extern int cpp_parse_escape PARAMS ((cpp_reader*, char**));
extern cpp_buffer* cpp_push_buffer PARAMS ((cpp_reader *, U_CHAR*, long));
extern cpp_buffer* cpp_pop_buffer PARAMS ((cpp_reader *));

extern cpp_hashnode* cpp_lookup PARAMS ((cpp_reader*, const U_CHAR*,
					 int, int));

#ifdef __cplusplus
}
#endif