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  *
   8  *  Licensed under the Open Software License version 1.1
   9  */
  10 #include <stdarg.h>
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include <ctype.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17
  18 #include "lib.h"
  19 #include "token.h"
  20 #include "parse.h"
  21 #include "symbol.h"
  22 #include "expression.h"
  23
  24 static unsigned int pre_buffer_size = 0;
  25 static unsigned char pre_buffer[8192];
  26
  27 static char *include = NULL;
  28 static int include_fd = -1;
  29
  30 static void add_pre_buffer(const char *fmt, ...)
  31 {
  32         va_list args;
  33         unsigned int size;
  34
  35         va_start(args, fmt);
  36         size = pre_buffer_size;
  37         size += vsnprintf(pre_buffer + size,
  38                 sizeof(pre_buffer) - size,
  39                 fmt, args);
  40         pre_buffer_size = size;
  41         va_end(args);
  42 }
  43
  44 static char ** handle_switch(char *arg, char **next)
  45 {
  46         switch (*arg) {
  47         case 'D': {
  48                 const char *name = arg+1;
  49                 const char *value = "";
  50                 for (;;) {
  51                         char c;
  52                         c = *++arg;
  53                         if (!c)
  54                                 break;
  55                         if (isspace(c) || c == '=') {
  56                                 *arg = '\0';
  57                                 value = arg+1;
  58                                 break;
  59                         }
  60                 }
  61                 add_pre_buffer("#define %s %s\n", name, value);
  62                 return next;
  63         }
  64
  65         case 'I':
  66                 add_pre_buffer("#add_include \"%s/\"\n", arg+1);
  67                 return next;
  68         case 'i':
  69                 if (*next && !strcmp(arg, "include")) {
  70                         char *name = *++next;
  71                         int fd = open(name, O_RDONLY);
  72                         include_fd = fd;
  73                         include = name;
  74                         if (fd < 0)
  75                                 perror(name);
  76                         return next;
  77                 }
  78         /* Fallthrough */
  79         default:
  80                 /* Ignore unknown command line options - they're probably gcc switches */
  81                 break;
  82         }
  83         return next;
  84 }
  85
  86 static void clean_up_symbol(struct symbol *sym, void *_parent, int flags)
  87 {
  88         check_duplicates(sym);
  89         evaluate_symbol(sym);
  90 }
  91
  92 int main(int argc, char **argv)
  93 {
  94         int fd;
  95         char *filename = NULL, **args;
  96         struct token *token;
  97
  98         // Initialize symbol stream first, so that we can add defines etc
  99         init_symbols();
 100
 101         add_pre_buffer("#define __linux__ 1\n");
 102         add_pre_buffer("#define __CHECKER__ 1\n");
 103         add_pre_buffer("#define cond_syscall(x)\n");
 104         add_pre_buffer("#define __GNUC__ 2\n");
 105         add_pre_buffer("#define __GNUC_MINOR__ 95\n");
 106         add_pre_buffer("#define __builtin_constant_p(x) 0\n");
 107         add_pre_buffer("#define __func__ \"function\"\n");
 108         add_pre_buffer("#define __extension__\n");
 109         add_pre_buffer("extern void *__builtin_memcpy(void *, const void *, unsigned long);\n");
 110         add_pre_buffer("extern void * __builtin_return_address(int);\n");
 111         add_pre_buffer("#define __builtin_stdarg_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
 112         add_pre_buffer("#define __builtin_va_arg(arg,type)  ((type)0)\n");
 113         add_pre_buffer("#define __builtin_va_end(arg)\n");
 114
 115         args = argv;
 116         for (;;) {
 117                 char *arg = *++args;
 118                 if (!arg)
 119                         break;
 120                 if (arg[0] == '-') {
 121                         args = handle_switch(arg+1, args);
 122                         continue;
 123                 }
 124                 filename = arg;
 125         }
 126
 127
 128         fd = open(filename, O_RDONLY);
 129         if (fd < 0)
 130                 die("No such file: %s", argv[1]);
 131
 132         // Tokenize the input stream
 133         token = tokenize(filename, fd, NULL);
 134         close(fd);
 135
 136         // Prepend any "include" file to the stream.
 137         if (include_fd >= 0)
 138                 token = tokenize(include, include_fd, token);
 139
 140         // Prepend the initial built-in stream
 141         token = tokenize_buffer(pre_buffer, pre_buffer_size, token);
 142
 143         // Pre-process the stream
 144         token = preprocess(token);
 145
 146         // Parse the resulting C code
 147         translation_unit(token, &used_list);
 148
 149         // Do type evaluation and simplify
 150         symbol_iterate(used_list, clean_up_symbol, NULL);
 151         return 0;
 152 }