inline Context::Context(Wasm* wasm) : wasm_(wasm), root_context_(this), plugin_(wasm->plugin()) {
  wasm_->contexts_[id_] = this;
}
inline Context::Context(Wasm* wasm) : wasm_(wasm), root_context_(this), plugin_(wasm->plugin()) {
  wasm_->contexts_[id_] = this;
}