infer_clone/infer/tests/codetoanalyze/objc/errors/npe/block.m

/*
 * Copyright (c) 2014 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import <Foundation/NSObject.h>

@interface A : NSObject
@end


@implementation A {

    void (^_block_field)(void);
}


- (void)doSomethingThenCallback:( void(^)(void) ) my_block
{
    // null dereference, segfault
    my_block();

}


- (void) foo {

    void (^my_block)(void)=^() {};
    my_block = NULL;
    my_block(); // Null deref

}


- foo2: ( void(^)(void) ) my_block {
  // ok to call this block!
  if(my_block != nil) {
    my_block();
}

}


- (void) foo3: ( void(^)(void) ) my_block {

    my_block = NULL;
    my_block(); //Null deref

}

- (void) foo4: ( void(^)(void) ) my_block_param {

    void (^my_block)(void)=^() {};
    my_block = NULL;
    my_block_param = my_block;
    my_block_param(); //Null deref

}

- (void) foo5: ( void(^)(void) ) my_block_param {

    void (^my_block)(void)=^() {};
    my_block_param = my_block;
    my_block_param(); //No error here

}


- (void) foo6: (BOOL)a block_param: ( void (^)(void)) block_param {

    void (^my_block)(void)=^() {
        if (block_param)
            block_param(); //No error here

    };

    if (a){
        [self foo2: ^() {
            my_block(); // No error here
        }];
    }

}

- (void) foo7 {

        _block_field(); // Ivar not nullable

}

@end