1 2 #include <stdio.h> 3 #include "valgrind.h" 4 5 /* Check that it's safe to call a wrapped function from some other 6 function's wrapper. Note that because the wrapper for fact1 7 actually interferes with the computation of the result, this 8 program produces a different answer when run on V (162) from 9 natively (120). 10 */ 11 12 static int fact1 ( int n ); 13 static int fact2 ( int n ); 14 15 /* This is needed to stop gcc4 turning 'fact' into a loop */ 16 __attribute__((noinline)) 17 int mul ( int x, int y ) { return x * y; } 18 19 int fact1 ( int n ) 20 { 21 if (n == 0) return 1; else return mul(n, fact2(n-1)); 22 } 23 int fact2 ( int n ) 24 { 25 if (n == 0) return 1; else return mul(n, fact1(n-1)); 26 } 27 28 29 int I_WRAP_SONAME_FNNAME_ZU(NONE,fact1) ( int n ) 30 { 31 int r; 32 OrigFn fn; 33 VALGRIND_GET_ORIG_FN(fn); 34 printf("in wrapper1-pre: fact(%d)\n", n); 35 CALL_FN_W_W(r, fn, n); 36 printf("in wrapper1-post: fact(%d) = %d\n", n, r); 37 if (n >= 3) r += fact2(2); 38 return r; 39 } 40 41 int I_WRAP_SONAME_FNNAME_ZU(NONE,fact2) ( int n ) 42 { 43 int r; 44 OrigFn fn; 45 VALGRIND_GET_ORIG_FN(fn); 46 printf("in wrapper2-pre: fact(%d)\n", n); 47 CALL_FN_W_W(r, fn, n); 48 printf("in wrapper2-post: fact(%d) = %d\n", n, r); 49 return r; 50 } 51 52 /* --------------- */ 53 54 int main ( void ) 55 { 56 int r; 57 printf("computing fact1(5)\n"); 58 r = fact1(5); 59 printf("fact1(5) = %d\n", r); 60 return 0; 61 } 62
