Catfish-Man

// Compile with clang -framework Foundation sethack.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

/*
 CFHashBytes from http://www.opensource.apple.com/source/CF/CF-1153.18/CFUtilities.c
 */
#define ELF_STEP(B) T1 = (H << 4) + B; T2 = T1 & 0xF0000000; if (T2) T1 ^= (T2 >> 24); T1 &= (~T2); H = T1;

Catfish-Man

//Given this:
NSArray *objects = @[@1, @2, @3]

//These are equivalent in behavior
NSNumber *first = [objects objectAtIndex:0]
NSNumber *second = (NSNumber *)CFArrayGetValueAtIndex(objects, 0)

//But is the code that runs the same? Not so much… in the first one we do…
objc_msgSend(objects, <selector reference>, 0)
-> http://sealiesoftware.com/msg/x86-mavericks.html

Catfish-Man

import Foundation

func measure(work:Void->Void) {
    let start = NSDate()
    for _ in 0..<100000 {
        work()
    }
    let elapsed = -(start.timeIntervalSinceNow)
    print(elapsed)
}

Catfish-Man

#import "Controller.h"

#define ENABLE_INLINE
#ifdef ENABLE_INLINE
#define INLINE static inline
#else
#define INLINE
#endif

static inline int INDEX(char letter) {

Catfish-Man

#!/usr/sbin/dtrace -q -s

/*
set(char *key, char *domain, char *user, char *host, char *container, char *value)
*/
CFPreferences$target:::set {
   printf("Set request at %Y ( key: %s, domain: %s, user:%s, host: %s, container: %s, value: %s)\n", walltimestamp, copyinstr(arg0), copyinstr(arg1), copyinstr(arg2), copyinstr(arg3), copyinstr(arg4), copyinstr(arg5));
   ustack();
   printf("\n\n\n");
}

Catfish-Man

#!/usr/sbin/dtrace -q -s
/*
CFPreferencesServer$target:::request {
printf("REQUEST from pid %d at %Y ( domain: %s, user: %s, host: %s, container: %s, managed: %d)\n",
    arg0,
    walltimestamp,
    arg1 != NULL ? copyinstr(arg1) : "(NULL)",
    arg2 != NULL ? copyinstr(arg2) : "(NULL)",
    arg3 != NULL ? copyinstr(arg3) : "(NULL)",
    arg4 != NULL ? copyinstr(arg4) : "(NULL)",

Catfish-Man

import Foundation

class Test
{
    func testing2(var x : Int) -> Int
    {
        if x % 3 == 0 {
            x += 10
        }
        x++