test/Analysis/casts.c

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin9 -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -verify %s
   2 // RUN: %clang_cc1 -triple i386-apple-darwin9 -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -verify %s
   3
   4 // Test if the 'storage' region gets properly initialized after it is cast to
   5 // 'struct sockaddr *'.
   6
   7 typedef unsigned char __uint8_t;
   8 typedef unsigned int __uint32_t;
   9 typedef __uint32_t __darwin_socklen_t;
  10 typedef __uint8_t sa_family_t;
  11 typedef __darwin_socklen_t socklen_t;
  12 struct sockaddr { sa_family_t sa_family; };
  13 struct sockaddr_storage {};
  14
  15 void getsockname();
  16
  17 void f(int sock) {
  18   struct sockaddr_storage storage;
  19   struct sockaddr* sockaddr = (struct sockaddr*)&storage;
  20   socklen_t addrlen = sizeof(storage);
  21   getsockname(sock, sockaddr, &addrlen);
  22   switch (sockaddr->sa_family) { // no-warning
  23   default:
  24     ;
  25   }
  26 }
  27
  28 struct s {
  29   struct s *value;
  30 };
  31
  32 void f1(struct s **pval) {
  33   int *tbool = ((void*)0);
  34   struct s *t = *pval;
  35   pval = &(t->value);
  36   tbool = (int *)pval; // use the cast-to type 'int *' to create element region.
  37   char c = (unsigned char) *tbool; // Should use cast-to type to create symbol.
  38   if (*tbool == -1) // here load the element region with the correct type 'int'
  39     (void)3;
  40 }
  41
  42 void f2(const char *str) {
  43  unsigned char ch, cl, *p;
  44
  45  p = (unsigned char *)str;
  46  ch = *p++; // use cast-to type 'unsigned char' to create element region.
  47  cl = *p++;
  48  if(!cl)
  49     cl = 'a';
  50 }
  51
  52 // Test cast VariableSizeArray to pointer does not crash.
  53 void *memcpy(void *, void const *, unsigned long);
  54 typedef unsigned char Byte;
  55 void doit(char *data, int len) {
  56     if (len) {
  57         Byte buf[len];
  58         memcpy(buf, data, len);
  59     }
  60 }
  61
  62 // PR 6013 and 6035 - Test that a cast of a pointer to long and then to int does not crash SValuator.
  63 void pr6013_6035_test(void *p) {
  64   unsigned int foo;
  65   foo = ((long)(p));
  66   (void) foo;
  67 }