test/Analysis/misc-ps-region-store.m

// RUN: clang-cc -analyze -checker-cfref --analyzer-store=region --verify -fblocks %s

typedef struct objc_selector *SEL;
typedef signed char BOOL;
typedef int NSInteger;
typedef unsigned int NSUInteger;
typedef struct _NSZone NSZone;
@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
@protocol NSObject  - (BOOL)isEqual:(id)object; @end
@protocol NSCopying  - (id)copyWithZone:(NSZone *)zone; @end
@protocol NSMutableCopying  - (id)mutableCopyWithZone:(NSZone *)zone; @end
@protocol NSCoding  - (void)encodeWithCoder:(NSCoder *)aCoder; @end
@interface NSObject <NSObject> {} - (id)init; @end
extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
@interface NSString : NSObject <NSCopying, NSMutableCopying, NSCoding>
- (NSUInteger)length;
+ (id)stringWithUTF8String:(const char *)nullTerminatedCString;
@end extern NSString * const NSBundleDidLoadNotification;
@interface NSAssertionHandler : NSObject {}
+ (NSAssertionHandler *)currentHandler;
- (void)handleFailureInMethod:(SEL)selector object:(id)object file:(NSString *)fileName lineNumber:(NSInteger)line description:(NSString *)format,...;
@end
extern NSString * const NSConnectionReplyMode;


//---------------------------------------------------------------------------
// Test case 'checkaccess_union' differs for region store and basic store.
// The basic store doesn't reason about compound literals, so the code
// below won't fire an "uninitialized value" warning.
//---------------------------------------------------------------------------

// PR 2948 (testcase; crash on VisitLValue for union types)
// http://llvm.org/bugs/show_bug.cgi?id=2948

void checkaccess_union() {
  int ret = 0, status;
  if (((((__extension__ (((union {  // expected-warning {{ Branch condition evaluates to an uninitialized value.}}
    __typeof (status) __in; int __i;}
    )
    {
      .__in = (status)}
      ).__i))) & 0xff00) >> 8) == 1)
        ret = 1;
}


// Check our handling of fields being invalidated by function calls.
struct test2_struct { int x; int y; char* s; };
void test2_helper(struct test2_struct* p);

char test2() {
  struct test2_struct s;
  test2_help(&s);
  char *p = 0;
  
  if (s.x > 1) {
    if (s.s != 0) {
      p = "hello";
    }
  }
  
  if (s.x > 1) {
    if (s.s != 0) {
      return *p;
    }
  }

  return 'a';
}