lldb/test/API/lang/c/register_variables/test.c

   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);
  18 void 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);
  24 void 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));
  31 float f3() {
  32   return 3.14f;
  33 }
  34
  35 int 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 }