const Type* Getelementptr::getSelectedType() const
{
const Type* selected = a()->type();
for(auto read = reads.begin() + 2; read != reads.end(); ++read)
{
assert(selected->isAggregate());
auto aggregate = static_cast<const AggregateType*>(selected);
if((*read)->isImmediate())
{
auto immediate = static_cast<const ImmediateOperand*>(*read);
selected = aggregate->getTypeAtIndex(immediate->uint);
continue;
}
assert((*read)->isRegister());
selected = aggregate->getTypeAtIndex(0);
}
return selected;
}
llvm::Value* CreateExpr::build(FuncBuilder& builder)
{
auto llvmTypePtr = ctor->getLlvmType(builder.modBuilder);
auto llvmType = llvmTypePtr->getTypeAtIndex(0u);
auto BB = builder.ir.GetInsertBlock();
auto sizeOf = llvm::ConstantExpr::getSizeOf(llvmType);
auto alloc = llvm::CallInst::CreateMalloc(
BB,
sizeOf->getType(),
llvmType,
sizeOf);
BB->getInstList().push_back(alloc);
for(auto i = 0u; i < parameters.size(); ++i)
{
auto slot = builder.ir.CreateStructGEP(alloc, i + 2);
auto value = parameters[i]->build(builder);
builder.ir.CreateStore(value, slot);
}
auto rcSlot = builder.ir.CreateStructGEP(alloc, 0);
builder.ir.CreateStore(builder.ir.getInt32(1), rcSlot);
auto tagSlot = builder.ir.CreateStructGEP(alloc, 1);
builder.ir.CreateStore(builder.ir.getInt32(ctor->tag), tagSlot);
return builder.ir.CreateBitCast(alloc, type->llvmType(builder.modBuilder));
}
/**
* @brief Generates access to aggregate type as a part of conversion of LLVM
* instruction insertvalue or extractvalue.
*
* @param[in] type Type of aggregate type.
* @param[in] base Base expression.
* @param[in] indices Array of indices.
*/
ShPtr<Expression> LLVMInstructionConverter::generateAccessToAggregateType(
llvm::CompositeType *type, const ShPtr<Expression> &base,
const llvm::ArrayRef<unsigned> &indices) {
auto typeIt = type;
auto access = base;
for (const auto &index: indices) {
auto indexBir = ConstInt::create(index, COMPOSITE_TYPE_INDEX_SIZE_BITS);
if (typeIt->isStructTy()) {
access = StructIndexOpExpr::create(access, indexBir);
} else if (typeIt->isArrayTy()) {
access = ArrayIndexOpExpr::create(access, indexBir);
}
typeIt = llvm::dyn_cast<llvm::CompositeType>(typeIt->getTypeAtIndex(index));
}
return access;
}
