[LLVMdev] FunctionType as a function argument

[Jeffrey Yasskin]

That would be TypeBuilder<char (*)(void*), false>...

On Mon, Nov 29, 2010 at 10:44 AM, Jeffrey Yasskin <jyasskin at google.com>wrote:

> You need a pointer-to-function type, but FunctionType just gives you a
> function type. Use PointerType::getUnqual(FunctionType::get(...)). Or
> TypeBuilder<char (*func)(void*), false>::get(context) from
> Support/TypeBuilder.h.
>
> On Mon, Nov 29, 2010 at 10:37 AM, Salomon Brys <salomon.brys at gmail.com>wrote:
>
>> Hi all.
>> I would like to declare a function that takes a function pointer as an
>> argument.
>> In C, it would be :
>>
>> void execute(char (*func)(void*), void *param)
>>
>> So, in my compiler, I have :
>> std::vector<const Type *> cbFPtrArgs(1, Type::getInt8PtrTy(C));
>>  FunctionType * cbFPtrTy = FunctionType::get(Type::getInt8Ty(C),
>> cbFPtrArgs, false);
>>  Function * func = cast<Function>(M->getOrInsertFunction(fName,
>> Type::getInt32Ty(C), cbFPtrTy, Type::getInt8PtrTy(C), (Type *)0));
>>
>> But then I get an error form LLVM :
>> /home/salomon/AppSRC/LLVM/release_28/lib/VMCore/Type.cpp:456:
>> llvm::FunctionType::FunctionType(llvm::Type const *, std::vector<llvm::Type
>> const *> const &, bool): Assertion `isValidArgumentType(Params[i]) && "Not a
>> valid type for function argument!"' failed.
>>
>> It seems that a FunctionType is not a valide function argument type.
>> Does someone know what am I missing ?
>>
>> Thank you very much for your help.
>>
>> --
>>
>>
>>
>>
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>>
>
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