1 #include <stdio.h> 2 3 #if defined(__arm__) || defined(__aarch64__) || defined (__mips__) || defined(__powerpc64__) 4 // Clang does not accept regparm attribute on these platforms. 5 // Fortunately, the default calling convention passes arguments in registers 6 // anyway. 7 #define REGPARM(N) 8 #else 9 #define REGPARM(N) __attribute__((regparm(N))) 10 #endif 11 12 struct bar { 13 int m1; 14 int m2; 15 }; 16 17 void f1(int a, struct bar *b) __attribute__((noinline)) REGPARM(2); f1(int a,struct bar * b)18void f1(int a, struct bar *b) 19 { 20 b->m2 = b->m1 + a; // set breakpoint here 21 } 22 23 void f2(struct bar *b) __attribute__((noinline)) REGPARM(1); f2(struct bar * b)24void f2(struct bar *b) 25 { 26 int c = b->m2; 27 printf("%d\n", c); // set breakpoint here 28 } 29 30 float f3() __attribute__((noinline)); f3()31float f3() { 32 return 3.14f; 33 } 34 main()35int main() 36 { 37 struct bar myBar = { 3, 4 }; 38 f1(2, &myBar); 39 f2(&myBar); 40 41 float f = f3(); 42 printf("%f\n", f); // set breakpoint here 43 return 0; 44 } 45