Method Build

cpp/src/gandiva/llvm_generator.cc:93–113

\brief Build the code for the expression trees for default mode with a LLVM ObjectCache. Each element in the vector represents an expression tree

/// \brief Build the code for the expression trees for default mode with a LLVM
/// ObjectCache. Each element in the vector represents an expression tree
Status LLVMGenerator::Build(const ExpressionVector& exprs, SelectionVector::Mode mode) {
  selection_vector_mode_ = mode;

  for (auto& expr : exprs) {
    auto output = annotator_.AddOutputFieldDescriptor(expr->result());
    ARROW_RETURN_NOT_OK(Add(expr, output));
  }

  // Compile and inject into the process' memory the generated function.
  ARROW_RETURN_NOT_OK(engine_->FinalizeModule());

  // setup the jit functions for each expression.
  for (auto& compiled_expr : compiled_exprs_) {
    auto fn_name = compiled_expr->GetFunctionName(mode);
    ARROW_ASSIGN_OR_RAISE(auto fn_ptr, engine_->CompiledFunction(fn_name));
    auto jit_fn = reinterpret_cast<EvalFunc>(fn_ptr);
    compiled_expr->SetJITFunction(selection_vector_mode_, jit_fn);
  }

  return Status::OK();
}

/// \brief Build the code for the expression trees for default mode. Each
/// element in the vector represents an expression tree