test/Analysis/CFString.c

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

//===----------------------------------------------------------------------===//
// The following code is reduced using delta-debugging from
// CoreFoundation.h (Mac OS X).
//
// It includes the basic definitions for the test cases below.
// Not directly including CoreFoundation.h directly makes this test case 
// both svelte and portable to non-Mac platforms.
//===----------------------------------------------------------------------===//

typedef signed long CFIndex;
typedef const struct __CFString * CFStringRef;
typedef struct {} CFArrayCallBacks;
extern const CFArrayCallBacks kCFTypeArrayCallBacks;
typedef const struct __CFArray * CFArrayRef;
typedef struct __CFArray * CFMutableArrayRef;
extern const void *CFArrayGetValueAtIndex(CFArrayRef theArray, CFIndex idx);
enum { kCFStringEncodingMacRoman = 0,     kCFStringEncodingWindowsLatin1 = 0x0500,     kCFStringEncodingISOLatin1 = 0x0201,     kCFStringEncodingNextStepLatin = 0x0B01,     kCFStringEncodingASCII = 0x0600,     kCFStringEncodingUnicode = 0x0100,     kCFStringEncodingUTF8 = 0x08000100,     kCFStringEncodingNonLossyASCII = 0x0BFF      ,     kCFStringEncodingUTF16 = 0x0100,     kCFStringEncodingUTF16BE = 0x10000100,     kCFStringEncodingUTF16LE = 0x14000100,      kCFStringEncodingUTF32 = 0x0c000100,     kCFStringEncodingUTF32BE = 0x18000100,     kCFStringEncodingUTF32LE = 0x1c000100  };

//===----------------------------------------------------------------------===//
// Test cases.
//===----------------------------------------------------------------------===//

void f1() {
  
  // Create the array.
  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks);

  // Create a string.
  CFStringRef s1 = CFStringCreateWithCString(0, "hello world",
                                             kCFStringEncodingUTF8);

  // Add the string to the array.
  CFArrayAppendValue(A, s1);
  
  // Decrement the reference count.
  CFRelease(s1); // no-warning
  
  // Get the string.  We don't own it.
  s1 = (CFStringRef) CFArrayGetValueAtIndex(A, 0);
  
  // Release the array.
  CFRelease(A); // no-warning
  
  // Release the string.  This is a bug.
  CFRelease(s1); // expected-warning{{Incorrect decrement of the reference count}}
}