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cflow(1)							      cflow(1)

       cflow - generate C flow graph

       cflow [-r] [-ix] [-i_] [-dnum] files

       The  command  analyzes  a  collection  of  C, YACC, LEX, assembler, and
       object files and attempts to build a graph charting the external refer‐
       ences.	Files suffixed in .y, .l, .c, and .i are YACC'd, LEX'd, and C-
       preprocessed (bypassed for  .i  files)  as  appropriate	and  then  run
       through	the  first  pass  of  The -I, -D, and -U options of the C-pre‐
       processor are also understood.  Files suffixed with  .s	are  assembled
       and  information is extracted from the symbol table.  The output of all
       this non-trivial processing is collected and turned  into  a  graph  of
       external references which is displayed upon the standard output.

       Each  line of output begins with a reference, or line, number, followed
       by a suitable number of tabs indicating the level.  Following the  ref‐
       erence number is the name of the global, a colon, and the global's def‐
       inition.	 (See the option for information on names that begin  with  an
       underscore.)   For  information extracted from C source, the definition
       consists of an abstract type declaration (for example,  char  ∗),  and,
       the  name  of  the source file and the line number where the definition
       was found.  The name of the source file and the line number are	delim‐
       ited  by angel brackets.	 Definitions extracted from object files indi‐
       cate the file name and location counter under which the symbol appeared
       (for example, text).  Leading underscores in C-style external names are

       Once a definition of a name has been printed, subsequent references  to
       that name contain only the reference number of the line where the defi‐
       nition may be found.  For undefined references, only <> is printed.

       The following is an example in file.c:
       int  i;


	    i = h();
       The command
       cflow -ix file.c
       produces the following output:
       1    main: int(), <file.c 4>
       2	 f: int(), <file.c 11>
       3	      h: <>
       4	      i: int, <file.c 1>
       5	 g: <>

       When the nesting level becomes too deep, the -e option of can  be  used
       to  compress  the tab expansion to something less than every eight spa‐

       -dnum		   The num decimal  integer  indicates	the  depth  at
			   which  the  flow graph is cut off.  By default this
			   is a very large number.  Attempts to set the cutoff
			   depth  to  a	 nonpositive  integer will be met with

       -i_		   Includes names that begin with an  underscore.  The
			   default  is to exclude these functions (and data if
			   -ix is used).

       -ix		   Includes external  and  static  data	 symbols.  The
			   default  is	to  include only functions in the flow

       -r		   Reverse the ``caller:callee'' relationship  produc‐
			   ing an inverted listing showing the callers of each
			   function.  The listing is also  sorted  in  lexico‐
			   graphical order by callee.

       Files  produced by and cause the reordering of line number declarations
       which can confuse To get proper results, feed the or input.

       Complains about bad options.  Complains about multiple definitions  and
       only believes the first.	 Other messages may come from the various pro‐
       grams used (for example, the C-preprocessor).

See Also
       as(1), cc(1), lex(1), lint(1), nm(1), pr(1), yacc(1)


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