pr_4164.c revision 033a07e5fca459ed184369cfee7c90d82367a93a 
1// RUN: %clang_cc1 -triple x86_64-apple-darwin9 -analyze -analyzer-checker=core,experimental.core -analyzer-store=region -verify %s
2
3// PR 4164: http://llvm.org/bugs/show_bug.cgi?id=4164
4//
5// Eventually this should be pulled into misc-ps.m.  This is in a separate test
6// file for now to play around with the specific issues for BasicStoreManager
7// and StoreManager (i.e., we can make a copy of this file for either
8// StoreManager should one start to fail in the near future).
9//
10// The basic issue is that the VarRegion for 'size' is casted to (char*),
11// resulting in an ElementRegion.  'getsockopt' is an unknown function that
12// takes a void*, which means the ElementRegion should get stripped off.
13typedef unsigned int __uint32_t;
14typedef __uint32_t __darwin_socklen_t;
15typedef __darwin_socklen_t socklen_t;
16int getsockopt(int, int, int, void * restrict, socklen_t * restrict);
17
18int test1() {
19  int s = -1;
20  int size;
21  socklen_t size_len = sizeof(size);
22  if (getsockopt(s, 0xffff, 0x1001, (char *)&size, &size_len) < 0)
23          return -1;
24
25  return size; // no-warning
26}
27
28// Similar case: instead of passing a 'void*', we pass 'char*'.  In this
29// case we pass an ElementRegion to the invalidation logic.  Since it is
30// an ElementRegion that just layers on top of another typed region and the
31// ElementRegion itself has elements whose type are integral (essentially raw
32// data) we strip off the ElementRegion when doing the invalidation.
33int takes_charptr(char* p);
34int test2() {
35  int size;
36  if (takes_charptr((char*)&size))
37    return -1;
38  return size; // no-warning
39}
40
41