// TEST_CONFIG #include "test.h" #include "testroot.i" #include <objc/runtime.h> static int state; #define ONE 1 #define TWO 2 #define LENGTH 3 #define COUNT 4 @interface Super : TestRoot @end @implementation Super +(void) one { state = ONE; } +(void) two { state = TWO; } +(void) length { state = LENGTH; } +(void) count { state = COUNT; } @end #define checkExchange(s1, v1, s2, v2) \ do { \ Method m1, m2; \ \ /* Check unexchanged version */ \ state = 0; \ [Super s1]; \ testassert(state == v1); \ state = 0; \ [Super s2]; \ testassert(state == v2); \ \ /* Exchange */ \ m1 = class_getClassMethod([Super class], @selector(s1)); \ m2 = class_getClassMethod([Super class], @selector(s2)); \ testassert(m1); \ testassert(m2); \ method_exchangeImplementations(m1, m2); \ \ /* Check exchanged version */ \ state = 0; \ [Super s1]; \ testassert(state == v2); \ state = 0; \ [Super s2]; \ testassert(state == v1); \ \ /* NULL should do nothing */ \ method_exchangeImplementations(m1, NULL); \ method_exchangeImplementations(NULL, m2); \ method_exchangeImplementations(NULL, NULL); \ \ /* Make sure NULL did nothing */ \ state = 0; \ [Super s1]; \ testassert(state == v2); \ state = 0; \ [Super s2]; \ testassert(state == v1); \ \ /* Put them back */ \ method_exchangeImplementations(m1, m2); \ \ /* Check restored version */ \ state = 0; \ [Super s1]; \ testassert(state == v1); \ state = 0; \ [Super s2]; \ testassert(state == v2); \ } while (0) int main() { // Check ordinary selectors checkExchange(one, ONE, two, TWO); // Check vtable selectors checkExchange(length, LENGTH, count, COUNT); // Check ordinary<->vtable and vtable<->ordinary checkExchange(count, COUNT, one, ONE); checkExchange(two, TWO, length, LENGTH); succeed(__FILE__); }