Creating local variable in function LLVM

Question

In llvm::Module there are 2 interesting fields:

typedef SymbolTableList FunctionListType;
typedef SymbolTableList

        

Answer 1

Local variables are allocated via alloca at runtime.

To create AllocaInst you need to

llvm::BasicBlock::iterator I = ...
const llvm::Type *Ty = 
auto AI = new AllocaInst(Ty, 0, Name, I);

To find allocas in a function you need to iterate over instructions:

for (auto I = F->begin(), E = F->end(); I != E; ++I) {
  for (auto J = I->begin(), E = I->end(); J != E; ++J) {
    if (auto AI = dyn_cast<AllocaInst>(*J)) {
      ..
    }
  }
}