[LLVMdev] Unit testing with random input using JIT

[Vu Le]

Hi Reid,
It's just an example.
All the tested function are in bitcode.
The arguments might be complex and might not be converted back to
GenericValue.


On Fri, Feb 11, 2011 at 10:45 AM, Reid Kleckner <reid.kleckner at gmail.com>wrote:

> If you know the prototype of f, you can just use getPointerToFunction
> and cast the result:
>
> // Let F be an llvm::Function* referring to 'f'.
> void (*f)(int*) = (void (*)(int*))JIT->getPointerToFunction(F);
> int a;
> f(&a);
> // read a
>
> I haven't compiled this, it's a guess at the usage from memory.
>
> Reid
>
> On Fri, Feb 11, 2011 at 12:55 PM, Vu Le <vmle at ucdavis.edu> wrote:
> > Suppose I want to test the function f with zero.
> > f(int *t){
> >   *t = 2
> > }
> > What I did was that I create a wrapper
> > void Wrapper(){
> >   int a = 1;
> >   int *b = &a;
> >   f(b);
> >   // now I want to print the value of b
> >   // but I don't know how
> > }
> >
> > Thanks.
> > Vu
> > On Thu, Feb 10, 2011 at 6:56 PM, Reid Kleckner <reid.kleckner at gmail.com>
> > wrote:
> >>
> >> Not sure what you mean here.  If you have a copy of that pointer in
> >> the caller of the wrapper function, you should be able to follow it to
> >> recover the modified value as normal.
> >>
> >> Reid
> >>
> >> On Thu, Feb 10, 2011 at 9:20 PM, Vu Le <vmle at ucdavis.edu> wrote:
> >> > Hi Reid,
> >> > If an argument is a pointer and the function changes the value it
> >> > pointed
> >> > to,
> >> > do you know how to get that updated value after executing the wrapper
> >> > function?
> >> >
> >> > Thanks.
> >> > Vu
> >> >
> >> > On Tue, Jan 11, 2011 at 2:40 PM, Reid Kleckner <
> reid.kleckner at gmail.com>
> >> > wrote:
> >> >>
> >> >> On Tue, Jan 11, 2011 at 1:41 PM, Vu Le <vmle at ucdavis.edu> wrote:
> >> >> > Hi,
> >> >> > I want to implement a tool that probes a function with several
> input
> >> >> > and
> >> >> > records all the return output.
> >> >> > The function might have more than 1 return value (by reference
> >> >> > parameters).
> >> >> >
> >> >> > Does ExecutionEngine::runFunction() support function call with
> >> >> > complex
> >> >> > argument type?
> >> >> > If not, I guess that I have to create a wrapper function, prepare
> all
> >> >> > the
> >> >> > data, and call the original function.
> >> >> > Am I on the right track?
> >> >>
> >> >> For functions with complicated parameters and return values,
> >> >> runFunction will generate a wrapper function that calls the function
> >> >> with the right arguments.  This is fairly expensive and leaks memory
> >> >> if called more than once for the same function.  If the type of the
> >> >> function is known, you can just use getPointerToFunction, cast that,
> >> >> and call it from C.
> >> >>
> >> >> If it's not known but you want to call it many times with different
> >> >> arguments, you could generate a wrapper function responsible for
> >> >> unpacking your own datastructure describing the arguments and calling
> >> >> the function you are testing with those arguments.  Seems like you
> are
> >> >> on the right track there.
> >> >>
> >> >> Reid
> >> >
> >> >
> >
> >
>
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