Method load_main_module

src/commands/run.rs:682–773

(
        &self,
        store: &mut Store<Host>,
        linker: &mut CliLinker,
        main_target: &RunTarget,
        profiled_modules: Vec<(String, Module)>,
    )

    }

    async fn load_main_module(
        &self,
        store: &mut Store<Host>,
        linker: &mut CliLinker,
        main_target: &RunTarget,
        profiled_modules: Vec<(String, Module)>,
    ) -> Result<CliInstance> {
        // The main module might be allowed to have unknown imports, which
        // should be defined as traps:
        if self.run.common.wasm.unknown_imports_trap == Some(true) {
            match linker {
                CliLinker::Core(linker) => {
                    linker.define_unknown_imports_as_traps(main_target.unwrap_core())?;
                }
                #[cfg(feature = "component-model")]
                CliLinker::Component(linker) => {
                    linker.define_unknown_imports_as_traps(main_target.unwrap_component())?;
                }
            }
        }

        // ...or as default values.
        if self.run.common.wasm.unknown_imports_default == Some(true) {
            match linker {
                CliLinker::Core(linker) => {
                    linker.define_unknown_imports_as_default_values(
                        &mut *store,
                        main_target.unwrap_core(),
                    )?;
                }
                _ => bail!("cannot use `--default-values-unknown-imports` with components"),
            }
        }

        let finish_epoch_handler =
            self.setup_epoch_handler(store, main_target, profiled_modules)?;

        let result = match linker {
            CliLinker::Core(linker) => {
                let module = main_target.unwrap_core();
                let instance = linker
                    .instantiate_async(&mut *store, &module)
                    .await
                    .with_context(|| {
                        format!("failed to instantiate {:?}", self.module_and_args[0])
                    })?;

                // If `_initialize` is present, meaning a reactor, then invoke
                // the function.
                if let Some(func) = instance.get_func(&mut *store, "_initialize") {
                    func.typed::<(), ()>(&store)?
                        .call_async(&mut *store, ())
                        .await?;
                }

                // Look for the specific function provided or otherwise look for
                // "" or "_start" exports to run as a "main" function.
                let func = if let Some(name) = &self.invoke {