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#include <fstream>
#include <iostream>
#include <sstream>
#include <wasmtime.hh>
using namespace wasmtime;
std::string readFile(const char *name) {
std::ifstream watFile;
watFile.open(name);
std::stringstream strStream;
strStream << watFile.rdbuf();
return strStream.str();
}
int main() {
std::cout << "Initializing...\n";
Engine engine;
Store store(engine);
std::cout << "Compiling module...\n";
auto wat = readFile("examples/externref.wat");
Module module = Module::compile(engine, wat).unwrap();
std::cout << "Instantiating module...\n";
Instance instance = Instance::create(store, module, {}).unwrap();
ExternRef externref(store, std::string("Hello, world!"));
std::any &data = externref.data(store);
std::cout << "externref data: " << std::any_cast<std::string>(data) << "\n";
std::cout << "Touching `externref` table..\n";
Table table = std::get<Table>(*instance.get(store, "table"));
table.set(store, 3, externref).unwrap();
ExternRef val = *table.get(store, 3)->externref(store);
std::cout << "externref data: " << std::any_cast<std::string>(val.data(store))
<< "\n";
std::cout << "Touching `externref` global..\n";
Global global = std::get<Global>(*instance.get(store, "global"));
global.set(store, externref).unwrap();
val = *global.get(store).externref(store);
std::cout << "externref data: " << std::any_cast<std::string>(val.data(store))
<< "\n";
std::cout << "Calling `externref` func..\n";
Func func = std::get<Func>(*instance.get(store, "func"));
auto results = func.call(store, {externref}).unwrap();
val = *results[0].externref(store);
std::cout << "externref data: " << std::any_cast<std::string>(val.data(store))
<< "\n";
std::cout << "Running a gc..\n";
store.context().gc();
}
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