[LLVMdev] Fwd: Need help to add operand for global metadata (original) (raw)

Henry Chung zhguanwen at gmail.com
Thu Oct 2 03:06:11 PDT 2014

Hi llvm-ers,

I try to assign unique IDs for each basic block in a module using globle metadata (NamedMDNode). However, I got an error: 'Invalide operand for global metadata!' and I have no idea how to deal with it. My llvm version is 3.6.0 and I use visual studio 2013 to build the project. The way to add MDNode is learnt from LLVM Giri project (their project is based on llvm 3.4).

Thanks for your time. :-) Henry

Here is the code snippet:

bool runOnModule(Module &M) { ... NamedMDNode *NMD = M.getOrInsertNamedMetadata(mdKindName); for (Module::iterator FI = M.begin(), FE = M.end(); FI != FE; ++FI) { for (Function::iterator BI = FI->begin(), BE = FI->end(); BI != BE; ++BI) { errs() << "Basic Block number: " << counter << "\n"; NMD->addOperand(assignID(BI, ++counter)); errs() << "Basic Block name: " << BI->getName() << "\n"; } } ... }

// Assign unique IDs to Basic Blocks as Metadata Nodes MDNode* assignID (BasicBlock* BB, unsigned id) { // Fetch the context in which the enclosing module was defined LLVMContext &Context = BB->getParent()->getParent()->getContext();

// Create a metadata node that contains ID as a constant:
Value* ID[2];
ID[0] = BB;
ID[1] = ConstantInt::get(Type::getInt32Ty(Context), id);
return MDNode::getWhenValsUnresolved(Context, ArrayRef<Value*>(ID, 2),

false); }

--

ZHONG, Guanwen (Henry) Ph.D. Candidate System & Networking Research Lab National University of Singapore

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