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#include <fstream>
#include <iostream>
#include <sstream>
#include <wasmtime.hh>
using namespace wasmtime;
template <typename T, typename E> T unwrap(Result<T, E> result) {
if (result) {
return result.ok();
}
std::cerr << "error: " << result.err().message() << "\n";
std::abort();
}
std::string readFile(const char *name) {
std::ifstream watFile;
watFile.open(name);
std::stringstream strStream;
strStream << watFile.rdbuf();
return strStream.str();
}
int main() {
Engine engine;
Store store(engine);
// Read our input `*.wat` files into `std::string`s
std::string linking1_wat = readFile("examples/linking1.wat");
std::string linking2_wat = readFile("examples/linking2.wat");
// Compile our two modules
Module linking1_module = Module::compile(engine, linking1_wat).unwrap();
Module linking2_module = Module::compile(engine, linking2_wat).unwrap();
// Configure WASI and store it within our `wasmtime_store_t`
WasiConfig wasi;
wasi.inherit_argv();
wasi.inherit_env();
wasi.inherit_stdin();
wasi.inherit_stdout();
wasi.inherit_stderr();
store.context().set_wasi(std::move(wasi)).unwrap();
// Create our linker which will be linking our modules together, and then add
// our WASI instance to it.
Linker linker(engine);
linker.define_wasi().unwrap();
// Instantiate our first module which only uses WASI, then register that
// instance with the linker since the next linking will use it.
Instance linking2 = linker.instantiate(store, linking2_module).unwrap();
linker.define_instance(store, "linking2", linking2).unwrap();
// And with that we can perform the final link and the execute the module.
Instance linking1 = linker.instantiate(store, linking1_module).unwrap();
Func f = std::get<Func>(*linking1.get(store, "run"));
f.call(store, {}).unwrap();
}
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