Added test case for PR 2600: proper use of NSError**

llvm-svn: 56332

clang/test/Analysis/CheckNSError.m

@@ -0,0 +1,31 @@
+// RUN: clang -checker-cfref -verify %s
+
+typedef signed char BOOL;
+typedef int NSInteger;
+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 NSCoding  - (void)encodeWithCoder:(NSCoder *)aCoder; @end
+@interface NSObject <NSObject> {} @end
+@class NSDictionary;
+@interface NSError : NSObject <NSCopying, NSCoding> {}
++ (id)errorWithDomain:(NSString *)domain code:(NSInteger)code userInfo:(NSDictionary *)dict;
+@end
+extern NSString * const NSXMLParserErrorDomain ;
+
+@interface A
+- (void)myMethodWhichMayFail:(NSError **)error;
+- (BOOL)myMethodWhichMayFail2:(NSError **)error;
+@end
+
+@implementation A
+- (void)myMethodWhichMayFail:(NSError **)error {   // expected-warning: {{Method accepting NSError** argument should have non-void return value to indicate that an error occurred.}}
+  *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // expected-warning: {{Potential null dereference.}}
+}
+
+- (BOOL)myMethodWhichMayFail2:(NSError **)error {  // no-warning
+  if (error) *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // no-warning
+  return 0;
+}
+@end