I am writing a pass where I need to make a function deceleration for
printf. Below is the code I'm trying to use.
-----
bool MyPass::runOnModule(Module &m) {
vector<const Type*> args;
args.push_back(PointerType::get(Type::SByteTy));
Function* f = m.getOrInsertFunction("printf",
FunctionType::get(Type::IntTy, args, true));
-----
When I insert a call instruction to printf, I am using the following code:
-----
/* i an Instruction*, and f is the Function* from above */
std::vector<Value*> args;
args.push_back(ConstantArray::get("test"));
new CallInst(f, args, "", i);
-----
However, when my pass is run with opt it complains:
-----
Call parameter type does not match function signature!
[5 x sbyte] c"test\00"
sbyte* call int (sbyte*, ...)* %printf( [5 x sbyte] c"test\00" ) ;
<int>:0 [#uses=0]
-----
Does anyone know what the problem is?
Thanks,
Ryan
--
Ryan M. Lefever [217.333.7231] [http://www.ews.uiuc.edu/~lefever]
Ok, I think I figured it out. I talked to someone, and we figured out
that when I make a call to printf with a constant string, I need to make
a global variable and use getElementPtr to reference it. The modified
call for accessing the printf is:
/* m is Module*, f is Function*, i is Instruction* */
Constant* constStr = ConstantArray::get("test\n");
GlobalVariable* gv = new GlobalVariable
(constStr->getType(), true, GlobalValue::InternalLinkage, constStr,
"", m);
std::vector<Constant*> geplist;
geplist.push_back(ConstantUInt::get(Type::UIntTy,0));
geplist.push_back(ConstantUInt::get(Type::UIntTy,0));
Constant* gep = ConstantExpr::getGetElementPtr(gv,geplist);
std::vector<Value*> args;
args.push_back(gep);
new CallInst(f, args, "", i);
Ryan M. Lefever wrote:> I am writing a pass where I need to make a function deceleration for
> printf. Below is the code I'm trying to use.
>
> -----
> bool MyPass::runOnModule(Module &m) {
> vector<const Type*> args;
> args.push_back(PointerType::get(Type::SByteTy));
> Function* f = m.getOrInsertFunction("printf",
> FunctionType::get(Type::IntTy, args, true));
> -----
>
> When I insert a call instruction to printf, I am using the following code:
>
> -----
> /* i an Instruction*, and f is the Function* from above */
> std::vector<Value*> args;
> args.push_back(ConstantArray::get("test"));
>
> new CallInst(f, args, "", i);
> -----
>
> However, when my pass is run with opt it complains:
>
> -----
> Call parameter type does not match function signature!
> [5 x sbyte] c"test\00"
> sbyte* call int (sbyte*, ...)* %printf( [5 x sbyte] c"test\00" )
;
> <int>:0 [#uses=0]
> -----
>
> Does anyone know what the problem is?
>
> Thanks,
> Ryan
>
--
Ryan M. Lefever [217.333.7231] [http://www.ews.uiuc.edu/~lefever]
On Mon, 1 May 2006, Ryan M. Lefever wrote:> Ok, I think I figured it out. I talked to someone, and we figured out that > when I make a call to printf with a constant string, I need to make a global > variable and use getElementPtr to reference it. The modified call for > accessing the printf is:Yup, that sounds right! -Chris> /* m is Module*, f is Function*, i is Instruction* */ > Constant* constStr = ConstantArray::get("test\n"); > GlobalVariable* gv = new GlobalVariable > (constStr->getType(), true, GlobalValue::InternalLinkage, constStr, > "", m); > std::vector<Constant*> geplist; > geplist.push_back(ConstantUInt::get(Type::UIntTy,0)); > geplist.push_back(ConstantUInt::get(Type::UIntTy,0)); > Constant* gep = ConstantExpr::getGetElementPtr(gv,geplist); > > std::vector<Value*> args; > args.push_back(gep); > > new CallInst(f, args, "", i); > > Ryan M. Lefever wrote: >> I am writing a pass where I need to make a function deceleration for >> printf. Below is the code I'm trying to use. >> >> ----- >> bool MyPass::runOnModule(Module &m) { >> vector<const Type*> args; >> args.push_back(PointerType::get(Type::SByteTy)); >> Function* f = m.getOrInsertFunction("printf", >> FunctionType::get(Type::IntTy, args, true)); >> ----- >> >> When I insert a call instruction to printf, I am using the following code: >> >> ----- >> /* i an Instruction*, and f is the Function* from above */ >> std::vector<Value*> args; >> args.push_back(ConstantArray::get("test")); >> >> new CallInst(f, args, "", i); >> ----- >> >> However, when my pass is run with opt it complains: >> >> ----- >> Call parameter type does not match function signature! >> [5 x sbyte] c"test\00" >> sbyte* call int (sbyte*, ...)* %printf( [5 x sbyte] c"test\00" ) ; >> <int>:0 [#uses=0] >> ----- >> >> Does anyone know what the problem is? >> >> Thanks, >> Ryan >> > >-Chris -- http://nondot.org/sabre/ http://llvm.org/