Modifying a struct member of a class's property

objc-code

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self modifyFrameWidth:self.view];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)modifyFrameWidth:(UIView *)view {
    CGRect frame = view.frame;
    frame.size.width = 315;
    view.frame = frame;
}

@end

objc-disassembly

SetterTestObjC`-[ViewController modifyFrameWidth:]:
    0x10061aa50 <+0>:   pushq  %rbp
    0x10061aa51 <+1>:   movq   %rsp, %rbp
    0x10061aa54 <+4>:   subq   $0xb0, %rsp
    0x10061aa5b <+11>:  leaq   -0x18(%rbp), %rax
    0x10061aa5f <+15>:  movq   %rdi, -0x8(%rbp)
    0x10061aa63 <+19>:  movq   %rsi, -0x10(%rbp)
    0x10061aa67 <+23>:  movq   $0x0, -0x18(%rbp)
    0x10061aa6f <+31>:  movq   %rax, %rdi
    0x10061aa72 <+34>:  movq   %rdx, %rsi
    0x10061aa75 <+37>:  callq  0x10061aea8               ; symbol stub for: objc_storeStrong
->  0x10061aa7a <+42>:  movq   -0x18(%rbp), %rax
    0x10061aa7e <+46>:  movq   0x2163(%rip), %rdx        ; "frame"
    0x10061aa85 <+53>:  cmpq   $0x0, %rax
    0x10061aa8b <+59>:  movq   %rdx, -0x80(%rbp)
    0x10061aa8f <+63>:  movq   %rax, -0x88(%rbp)
    0x10061aa96 <+70>:  je     0x10061aab5               ; <+101> at ViewController.m:29
    0x10061aa9c <+76>:  leaq   -0x38(%rbp), %rdi
    0x10061aaa0 <+80>:  movq   -0x88(%rbp), %rsi
    0x10061aaa7 <+87>:  movq   -0x80(%rbp), %rdx
    0x10061aaab <+91>:  callq  0x10061ae96               ; symbol stub for: objc_msgSend_stret
    0x10061aab0 <+96>:  jmp    0x10061aaca               ; <+122> at ViewController.m:29
    0x10061aab5 <+101>: xorl   %esi, %esi
    0x10061aab7 <+103>: movl   $0x20, %eax
    0x10061aabc <+108>: movl   %eax, %edx
    0x10061aabe <+110>: leaq   -0x38(%rbp), %rcx
    0x10061aac2 <+114>: movq   %rcx, %rdi
    0x10061aac5 <+117>: callq  0x10061aeae               ; symbol stub for: memset
    0x10061aaca <+122>: leaq   -0x78(%rbp), %rax
    0x10061aace <+126>: movsd  0x46a(%rip), %xmm0
    0x10061aad6 <+134>: movsd  %xmm0, -0x28(%rbp)
    0x10061aadb <+139>: movq   -0x18(%rbp), %rcx
    0x10061aadf <+143>: movq   -0x38(%rbp), %rdx
    0x10061aae3 <+147>: movq   %rdx, -0x58(%rbp)
    0x10061aae7 <+151>: movq   -0x30(%rbp), %rdx
    0x10061aaeb <+155>: movq   %rdx, -0x50(%rbp)
    0x10061aaef <+159>: movq   -0x28(%rbp), %rdx
    0x10061aaf3 <+163>: movq   %rdx, -0x48(%rbp)
    0x10061aaf7 <+167>: movq   -0x20(%rbp), %rdx
    0x10061aafb <+171>: movq   %rdx, -0x40(%rbp)
    0x10061aaff <+175>: movq   -0x58(%rbp), %rdx
    0x10061ab03 <+179>: movq   %rdx, -0x78(%rbp)
    0x10061ab07 <+183>: movq   -0x50(%rbp), %rdx
    0x10061ab0b <+187>: movq   %rdx, -0x70(%rbp)
    0x10061ab0f <+191>: movq   -0x48(%rbp), %rdx
    0x10061ab13 <+195>: movq   %rdx, -0x68(%rbp)
    0x10061ab17 <+199>: movq   -0x40(%rbp), %rdx
    0x10061ab1b <+203>: movq   %rdx, -0x60(%rbp)
    0x10061ab1f <+207>: movq   0x20ca(%rip), %rsi        ; "setFrame:"
    0x10061ab26 <+214>: movq   %rcx, %rdi
    0x10061ab29 <+217>: movq   (%rax), %rcx
    0x10061ab2c <+220>: movq   %rcx, (%rsp)
    0x10061ab30 <+224>: movq   0x8(%rax), %rcx
    0x10061ab34 <+228>: movq   %rcx, 0x8(%rsp)
    0x10061ab39 <+233>: movq   0x10(%rax), %rcx
    0x10061ab3d <+237>: movq   %rcx, 0x10(%rsp)
    0x10061ab42 <+242>: movq   0x18(%rax), %rax
    0x10061ab46 <+246>: movq   %rax, 0x18(%rsp)
    0x10061ab4b <+251>: callq  0x10061ae8a               ; symbol stub for: objc_msgSend
    0x10061ab50 <+256>: xorl   %r8d, %r8d
    0x10061ab53 <+259>: movl   %r8d, %esi
    0x10061ab56 <+262>: leaq   -0x18(%rbp), %rax
    0x10061ab5a <+266>: movq   %rax, %rdi
    0x10061ab5d <+269>: callq  0x10061aea8               ; symbol stub for: objc_storeStrong
    0x10061ab62 <+274>: addq   $0xb0, %rsp
    0x10061ab69 <+281>: popq   %rbp
    0x10061ab6a <+282>: retq   

swift-code

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        modifyFrameWidth(self.view)
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    func modifyFrameWidth(view : UIView) {
        view.frame.size.width = 315;
    }
}

swift-disassembly

SetterTestSwift`SetterTestSwift.ViewController.modifyFrameWidth (SetterTestSwift.ViewController)(ObjectiveC.UIView) -> ():
    0x10f516be0 <+0>:   pushq  %rbp
    0x10f516be1 <+1>:   movq   %rsp, %rbp
    0x10f516be4 <+4>:   subq   $0x80, %rsp
    0x10f516beb <+11>:  leaq   -0x30(%rbp), %rax
    0x10f516bef <+15>:  movq   %rdi, -0x8(%rbp)
    0x10f516bf3 <+19>:  movq   %rsi, -0x10(%rbp)
->  0x10f516bf7 <+23>:  movq   0x828a(%rip), %rdx        ; "frame"
    0x10f516bfe <+30>:  movq   %rdi, %rcx
    0x10f516c01 <+33>:  movq   %rdi, -0x58(%rbp)
    0x10f516c05 <+37>:  movq   %rax, %rdi
    0x10f516c08 <+40>:  movq   %rsi, -0x60(%rbp)
    0x10f516c0c <+44>:  movq   %rcx, %rsi
    0x10f516c0f <+47>:  callq  0x10f51c7b6               ; symbol stub for: objc_msgSend_stret
    0x10f516c14 <+52>:  leaq   -0x50(%rbp), %rax
    0x10f516c18 <+56>:  movsd  0x5da0(%rip), %xmm0
    0x10f516c20 <+64>:  movsd  -0x30(%rbp), %xmm1
    0x10f516c25 <+69>:  movsd  -0x28(%rbp), %xmm2
    0x10f516c2a <+74>:  movsd  -0x18(%rbp), %xmm3
    0x10f516c2f <+79>:  movq   0x825a(%rip), %rsi        ; "setFrame:"
    0x10f516c36 <+86>:  movsd  %xmm1, -0x50(%rbp)
    0x10f516c3b <+91>:  movsd  %xmm2, -0x48(%rbp)
    0x10f516c40 <+96>:  movsd  %xmm0, -0x40(%rbp)
    0x10f516c45 <+101>: movsd  %xmm3, -0x38(%rbp)
    0x10f516c4a <+106>: movq   -0x58(%rbp), %rcx
    0x10f516c4e <+110>: movq   %rcx, %rdi
    0x10f516c51 <+113>: movq   (%rax), %rcx
    0x10f516c54 <+116>: movq   %rcx, (%rsp)
    0x10f516c58 <+120>: movq   0x8(%rax), %rcx
    0x10f516c5c <+124>: movq   %rcx, 0x8(%rsp)
    0x10f516c61 <+129>: movq   0x10(%rax), %rcx
    0x10f516c65 <+133>: movq   %rcx, 0x10(%rsp)
    0x10f516c6a <+138>: movq   0x18(%rax), %rax
    0x10f516c6e <+142>: movq   %rax, 0x18(%rsp)
    0x10f516c73 <+147>: callq  0x10f51c7aa               ; symbol stub for: objc_msgSend
    0x10f516c78 <+152>: movq   -0x60(%rbp), %rdi
    0x10f516c7c <+156>: callq  0x10f51c7bc               ; symbol stub for: objc_release
    0x10f516c81 <+161>: movq   -0x58(%rbp), %rdi
    0x10f516c85 <+165>: callq  0x10f51c7bc               ; symbol stub for: objc_release
    0x10f516c8a <+170>: addq   $0x80, %rsp
    0x10f516c91 <+177>: popq   %rbp
    0x10f516c92 <+178>: retq