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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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49fe0dc74a
There will be a lot more to come. On amd64 Linux In faultstatus was seeing the division by zero and emitting a ud2 opcode. In wrap3 a pair of mutually recursive functions were being inlined. When forced not to be inlined GCC merged them into a single function. It cannot see that the client requests have diffeent behaviour.
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
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#include <stdio.h>
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#include "valgrind.h"
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/* Check that function wrapping works for a mutually recursive
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pair. */
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int fact1 ( int n );
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int fact2 ( int n );
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/* This is needed to stop gcc4 turning 'fact' into a loop */
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__attribute__((noinline))
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int mul ( int x, int y ) { return x * y; }
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__attribute((noinline))
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int fact1 ( int n )
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{
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if (n == 0) return 1; else return mul(n, fact2(n-1));
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}
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__attribute((noinline))
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int fact2 ( int n )
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{
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if (n == 0) return 1; else return mul(n, fact1(n-1));
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}
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int I_WRAP_SONAME_FNNAME_ZU(NONE,fact1) ( int n )
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{
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int r;
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OrigFn fn;
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VALGRIND_GET_ORIG_FN(fn);
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printf("in wrapper1-pre: fact(%d)\n", n);
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CALL_FN_W_W(r,fn,n);
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printf("in wrapper1-post: fact(%d) = %d\n", n, r);
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return r;
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}
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int I_WRAP_SONAME_FNNAME_ZU(NONE,fact2) ( int n )
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{
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int r;
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OrigFn fn;
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VALGRIND_GET_ORIG_FN(fn);
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printf("in wrapper2-pre: fact(%d)\n", n);
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CALL_FN_W_W(r,fn,n);
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printf("in wrapper2-post: fact(%d) = %d\n", n, r);
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return r;
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}
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/* --------------- */
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int main ( void )
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{
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int r;
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printf("computing fact1(5)\n");
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r = fact1(5);
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printf("fact1(5) = %d\n", r);
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return 0;
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}
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