How to change the type of operands in the Callinst in llvm? -

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i trying implement transformation of callinst , perform following:

  1. change type of arguments of function calls

  2. change type of return value

for example, want change following ir:

    %call = call double @add(double %0, double %1)      define double @add(double %x, double %y) #0 {     entry:       %x.addr = alloca double, align 8       %y.addr = alloca double, align 8       store double %x, double* %x.addr, align 8       store double %y, double* %y.addr, align 8       %0 = load double, double* %x.addr, align 8       %1 = load double, double* %x.addr, align 8       %add = fadd double %0, %1       ret double %add     }

to ir_new:

    %call = call x86_fp80 @new_add(x86_fp80 %0, x86_fp80 %1)      define x86_fp80 @new_add(x86_fp80 %x, x86_fp80 %y) #0 {     entry:       %x.addr = alloca x86_fp80, align 16       %y.addr = alloca x86_fp80, align 16       store x86_fp80 %x, x86_fp80* %x.addr, align 16       store x86_fp80 %y, x86_fp80* %y.addr, align 16       %0 = load x86_fp80, x86_fp80* %x.addr, align 16       %1 = load x86_fp80, x86_fp80* %x.addr, align 16       %add = fadd x86_fp80 %0, %1       ret x86_fp80 %add     }

i have finished changing type of allocainst, storeinst, loadinst, binaryoperator , returninst.

i confused how deal callinst.

my original idea when iterating instructions, if find callinst,

   if (callinst *call = dyn_cast<callinst>(it)){

do following 3 steps:

  1. construct new functiontype 

    x86_fp80(x86_fp80, x86_fp80)

    using

    std::vector<type*> paramtys; paramtys.push_back(type::getx86_fp80ty(context)); paramtys.push_back(type::getx86_fp80ty(context)); functiontype *new_fun_type = functiontype::get(type::getx86_fp80ty(context), paramtys, true);

  2. construct function new type in step 1, i.e. construct new_add in example

    function *fun = call->getcalledfunction(); function *new_fun = function::create(new_fun_type,fun->getlinkage(), "", fun->getparent());

  3. construct new callinst new function obtained step 2.

    callinst *new_call = callinst::create(new_fun, *arrayrefoperands, "newcall", call); new_call->takename(call); }

however, in way, got following ir instead of ir_new want:

   %call = call x86_fp80 (x86_fp80, x86_fp80, ...) @0(x86_fp80 %5, x86_fp80 %7)     declare x86_fp80 @new_add(x86_fp80, x86_fp80, ...)

a new definition of called function constructed(declare x86_fp80 @new_add(x86_fp80, x86_fp80, ...)), body of new function empty. confused how add body , ir_new want. naive idea is:

   (instruction : called function(add in example)){        create new_i type x86_fp80;        insert new_i in new function constructed(new_add in example);      }

is way achieve goal?

any advice appreciated :)

you can use llvm::value::mutatetype(llvm::ty) change double type value x86_fp80 if no longer using original function somewhere else. goto function definition using callinst->getcalledfunction() , iterate on value mutate double types x86_fp80.

ref: http://llvm.org/docs/doxygen/html/classllvm_1_1value.html#ac0f09c2c9951158f9eecfaf7068d7b20


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