check.c

   1 /*
   2  * Example trivial client program that uses the sparse library
   3  * to tokenize, pre-process and parse a C file, and prints out
   4  * the results.
   5  *
   6  * Copyright (C) 2003 Transmeta Corp.
   7  *               2003 Linus Torvalds
   8  *
   9  *  Licensed under the Open Software License version 1.1
  10  */
  11 #include <stdarg.h>
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <ctype.h>
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18
  19 #include "lib.h"
  20 #include "token.h"
  21 #include "parse.h"
  22 #include "symbol.h"
  23 #include "expression.h"
  24
  25 static void clean_up_symbol(struct symbol *sym, void *_parent, int flags)
  26 {
  27         evaluate_symbol(sym);
  28         check_duplicates(sym);
  29         expand_symbol(sym);
  30 }
  31
  32 int main(int argc, char **argv)
  33 {
  34         int fd;
  35         char *filename = NULL, **args;
  36         struct token *token;
  37
  38         // Initialize symbol stream first, so that we can add defines etc
  39         init_symbols();
  40
  41         create_builtin_stream();
  42         add_pre_buffer("#define __CHECKER__ 1\n");
  43         add_pre_buffer("extern void *__builtin_memcpy(void *, const void *, unsigned long);\n");
  44         add_pre_buffer("extern void *__builtin_return_address(int);\n");
  45         add_pre_buffer("extern void *__builtin_memset(void *, int, unsigned long);\n");
  46         add_pre_buffer("extern void __builtin_trap(void);\n");
  47         add_pre_buffer("extern int __builtin_ffs(unsigned long);\n"); /* XXX(cw) check this */
  48
  49         args = argv;
  50         for (;;) {
  51                 char *arg = *++args;
  52                 if (!arg)
  53                         break;
  54                 if (arg[0] == '-') {
  55                         args = handle_switch(arg+1, args);
  56                         continue;
  57                 }
  58                 filename = arg;
  59         }
  60
  61         // Initialize type system
  62         init_ctype();
  63
  64         fd = open(filename, O_RDONLY);
  65         if (fd < 0)
  66                 die("No such file: %s", filename);
  67
  68         // Tokenize the input stream
  69         token = tokenize(filename, fd, NULL);
  70         close(fd);
  71
  72         // Prepend any "include" file to the stream.
  73         if (include_fd >= 0)
  74                 token = tokenize(include, include_fd, token);
  75
  76         // Prepend the initial built-in stream
  77         token = tokenize_buffer(pre_buffer, pre_buffer_size, token);
  78
  79         // Pre-process the stream
  80         token = preprocess(token);
  81
  82         if (preprocess_only) {
  83                 while (!eof_token(token)) {
  84                         int prec = 1;
  85                         struct token *next = token->next;
  86                         char * separator = "";
  87                         if (next->pos.whitespace)
  88                                 separator = " ";
  89                         if (next->pos.newline) {
  90                                 separator = "\n\t\t\t\t\t";
  91                                 prec = next->pos.pos;
  92                                 if (prec > 4)
  93                                         prec = 4;
  94                         }
  95                         printf("%s%.*s", show_token(token), prec, separator);
  96                         token = next;
  97                 }
  98                 putchar('\n');
  99
 100                 return 0;
 101         }
 102
 103         // Parse the resulting C code
 104         translation_unit(token, &used_list);
 105
 106         // Do type evaluation and simplify
 107         symbol_iterate(used_list, clean_up_symbol, NULL);
 108         return 0;
 109 }