I'm getting a 'function arguments must be value types' assertion from the following (abridged) code. Basically, I'm writing a pass that inserts llvm.frameaddress intrinsic calls everywhere 'interesting' that passes on the result by calling the C function void mcp_trace_stack(char *ptr). First I grab the functions themselves:
Constant *MCPTraceStack, *LLVMFrameAddress;
std::vector<const Type*> argstype;
argstype.push_back(PointerType::get(Type::Int8Ty));
FunctionType *FT = FunctionType::get(Type::VoidTy, argstype, false);
MCPTraceStack = M.getOrInsertFunction("mcp_trace_stack", FT);
std::vector<const Type*> frargstype;
frargstype.push_back(Type::VoidTy);
FunctionType *FA = FunctionType::get(PointerType::get(Type::Int8Ty), frargstype, false);
LLVMFrameAddress = M.getOrInsertFunction("llvm.frameaddress", FA);
then (in the pass itself) I use a code fragment like the following:
CallInst *faddr = new CallInst(LLVMFrameAddress, "", np);
new CallInst(MCPTraceStack, faddr, "", np);
which compiles fine, but at run-time (under opt) the pass aborts with an assertion. I realise I've probably done something subtly wrong, but I've been prodding at this for ages now and I just can't find it.
Thank you in advance,
Sarah