test/Analysis/misc-ps.m

// RUN: clang -checker-cfref --verify %s

// Reduced test case from crash in <rdar://problem/6253157>
@class NSObject;
@interface A @end
@implementation A
- (void)foo:(void (^)(NSObject *x))block {
  if (!((block != ((void *)0)))) {}
}
@end

// Reduced test case from crash in PR 2796;
//  http://llvm.org/bugs/show_bug.cgi?id=2796

unsigned foo(unsigned x) { return __alignof__((x)) + sizeof(x); }

// Improvement to path-sensitivity involving compound assignments.
//  Addresses false positive in <rdar://problem/6268365>
//

unsigned r6268365Aux();

void r6268365() {
  unsigned x = 0;
  x &= r6268365Aux();
  unsigned j = 0;
    
  if (x == 0) ++j;
  if (x == 0) x = x / j; // no-warning
}

void divzeroassume(unsigned x, unsigned j) {  
  x /= j;  
  if (j == 0) x /= 0;     // no-warning
  if (j == 0) x /= j;     // no-warning
  if (j == 0) x = x / 0;  // no-warning
}

void divzeroassumeB(unsigned x, unsigned j) {  
  x = x / j;  
  if (j == 0) x /= 0;     // no-warning
  if (j == 0) x /= j;     // no-warning
  if (j == 0) x = x / 0;  // no-warning
}