Implementation of doSome:for:, ripe for disassembly. Look at the disassembly of main() for the calls to objc_msgSend.

someObject.m

#import <Foundation/Foundation.h>

// clang -g -Wall -framework Foundation -o someObject someObject.m

@interface SomeObject : NSObject

- (void) doSome: (id) stuff  for: (id) reasons;

@end // SomeObject


@implementation SomeObject

- (void) doSome: (id) stuff  for: (id) reasons {
    NSLog (@"Did some %@ for %@", stuff, reasons);
} // doSome

@end // SomeObject


int main (void) {
    @autoreleasepool {
        SomeObject *obj = [[SomeObject alloc] init];

        [obj doSome: @"stuff"  for: @"reasons"];
    }

    return 0;
} // main