How can I evaluate a block in the LLVM debugger, with xcode?

Question

I have a block called myBlock.

I put a breakpoint after the creation of myBlock. In the console, I type

  p myBlock(@"5")

All I get is the error

 error: called object type '__block_literal_generic *' is not a function or function pointer
 error: 1 errors parsing expression

So, it it possible to evaluate in block in the debugger console?

PS: More code

NSArray * array = @[@"a", @"b"] ;

BOOL (^myBlock)(NSString *) = ^BOOL(NSString * string)
    {
        return [string isEqualToString:@"hello"] ;
    } ;

// The breakpoint is here

for (NSString * str in array)
{
    myBlock(str) ;
}

Martin R · Accepted Answer · 2014-02-20 13:12:40Z

2

It seems that you have to explicitely cast the variable to the block type:

(lldb) p ( (BOOL(^)(NSString *)) myBlock )(@"hello")
(BOOL) $3 = YES
(lldb) p ( (BOOL(^)(NSString *)) myBlock )(@"world")
(BOOL) $4 = NO

answered Feb 20, 2014 at 13:12

Martin R

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