objective-c - 在 @try block 中调用函数是否会导致性能损失？

Question

与不使用 try block 调用 blabla 相比，这会导致性能下降吗？

-(void)bla{
    @try{
        [self blabla];
    }
    @catch (NSException *e) {
        // Do nothing
    }
}

Answer 1

来自 doc

Zero-Cost @try Blocks

64-bit processes that enter a zero-cost @try block incur no performance penalty. This is unlike the mechanism for 32-bit processes, which calls setjmp() and performs additional “bookkeeping”. However, throwing an exception is much more expensive in 64-bit executables. For best performance in 64-bit, you should throw exceptions only when absolutely necessary.

因此 64 位 进程没有开销