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#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <cinttypes>
#include "wasm.hh"
// A function to be called from Wasm code.
auto callback(const wasm::vec<wasm::Val>& args, wasm::vec<wasm::Val>& results)
-> wasm::own<wasm::Trap> {
std::cout << "Calling back..." << std::endl;
std::cout << "> " << (args[0].ref() ? args[0].ref()->get_host_info() : nullptr) << std::endl;
results[0] = args[0].copy();
return nullptr;
}
auto get_export_func(const wasm::ownvec<wasm::Extern>& exports, size_t i) -> const wasm::Func* {
if (exports.size() <= i || !exports[i]->func()) {
std::cout << "> Error accessing function export " << i << "/" << exports.size() << "!" << std::endl;
exit(1);
}
return exports[i]->func();
}
auto get_export_global(wasm::ownvec<wasm::Extern>& exports, size_t i) -> wasm::Global* {
if (exports.size() <= i || !exports[i]->global()) {
std::cout << "> Error accessing global export " << i << "!" << std::endl;
exit(1);
}
return exports[i]->global();
}
auto get_export_table(wasm::ownvec<wasm::Extern>& exports, size_t i) -> wasm::Table* {
if (exports.size() <= i || !exports[i]->table()) {
std::cout << "> Error accessing table export " << i << "!" << std::endl;
exit(1);
}
return exports[i]->table();
}
void call_r_v(const wasm::Func* func, const wasm::Ref* ref) {
std::cout << "call_r_v... " << std::flush;
auto args = wasm::vec<wasm::Val>::make(
wasm::Val::ref(ref ? ref->copy() : wasm::own<wasm::Ref>()));
auto results = wasm::vec<wasm::Val>::make();
if (func->call(args, results)) {
std::cout << "> Error calling function!" << std::endl;
exit(1);
}
std::cout << "okay" << std::endl;
}
auto call_v_r(const wasm::Func* func) -> wasm::own<wasm::Ref> {
std::cout << "call_v_r... " << std::flush;
auto args = wasm::vec<wasm::Val>::make();
auto results = wasm::vec<wasm::Val>::make_uninitialized(1);
if (func->call(args, results)) {
std::cout << "> Error calling function!" << std::endl;
exit(1);
}
std::cout << "okay" << std::endl;
return results[0].release_ref();
}
auto call_r_r(const wasm::Func* func, const wasm::Ref* ref) -> wasm::own<wasm::Ref> {
std::cout << "call_r_r... " << std::flush;
auto args = wasm::vec<wasm::Val>::make(
wasm::Val::ref(ref ? ref->copy() : wasm::own<wasm::Ref>()));
auto results = wasm::vec<wasm::Val>::make_uninitialized(1);
if (func->call(args, results)) {
std::cout << "> Error calling function!" << std::endl;
exit(1);
}
std::cout << "okay" << std::endl;
return results[0].release_ref();
}
void call_ir_v(const wasm::Func* func, int32_t i, const wasm::Ref* ref) {
std::cout << "call_ir_v... " << std::flush;
auto args = wasm::vec<wasm::Val>::make(
wasm::Val::i32(i),
wasm::Val::ref(ref ? ref->copy() : wasm::own<wasm::Ref>()));
auto results = wasm::vec<wasm::Val>::make();
if (func->call(args, results)) {
std::cout << "> Error calling function!" << std::endl;
exit(1);
}
std::cout << "okay" << std::endl;
}
auto call_i_r(const wasm::Func* func, int32_t i) -> wasm::own<wasm::Ref> {
std::cout << "call_i_r... " << std::flush;
auto args = wasm::vec<wasm::Val>::make(wasm::Val::i32(i));
auto results = wasm::vec<wasm::Val>::make_uninitialized(1);
if (func->call(args, results)) {
std::cout << "> Error calling function!" << std::endl;
exit(1);
}
std::cout << "okay" << std::endl;
return results[0].release_ref();
}
void check(wasm::own<wasm::Ref> actual, const wasm::Ref* expected) {
if (actual.get() != expected &&
!(actual && expected && actual->same(expected))) {
std::cout << "> Error reading reference, expected "
<< (expected ? expected->get_host_info() : nullptr) << ", got "
<< (actual ? actual->get_host_info() : nullptr) << std::endl;
exit(1);
}
}
void run() {
// Initialize.
std::cout << "Initializing..." << std::endl;
auto engine = wasm::Engine::make();
auto store_ = wasm::Store::make(engine.get());
auto store = store_.get();
// Load binary.
std::cout << "Loading binary..." << std::endl;
std::ifstream file("hostref.wasm");
file.seekg(0, std::ios_base::end);
auto file_size = file.tellg();
file.seekg(0);
auto binary = wasm::vec<byte_t>::make_uninitialized(file_size);
file.read(binary.get(), file_size);
file.close();
if (file.fail()) {
std::cout << "> Error loading module!" << std::endl;
return;
}
// Compile.
std::cout << "Compiling module..." << std::endl;
auto module = wasm::Module::make(store, binary);
if (!module) {
std::cout << "> Error compiling module!" << std::endl;
return;
}
// Create external callback function.
std::cout << "Creating callback..." << std::endl;
auto callback_type =
wasm::FuncType::make(wasm::ownvec<wasm::ValType>::make(
wasm::ValType::make(wasm::ValKind::EXTERNREF)),
wasm::ownvec<wasm::ValType>::make(
wasm::ValType::make(wasm::ValKind::EXTERNREF)));
auto callback_func = wasm::Func::make(store, callback_type.get(), callback);
// Instantiate.
std::cout << "Instantiating module..." << std::endl;
auto imports = wasm::vec<wasm::Extern*>::make(callback_func.get());
auto instance = wasm::Instance::make(store, module.get(), imports);
if (!instance) {
std::cout << "> Error instantiating module!" << std::endl;
return;
}
// Extract export.
std::cout << "Extracting exports..." << std::endl;
auto exports = instance->exports();
size_t i = 0;
auto global = get_export_global(exports, i++);
auto table = get_export_table(exports, i++);
auto global_set = get_export_func(exports, i++);
auto global_get = get_export_func(exports, i++);
auto table_set = get_export_func(exports, i++);
auto table_get = get_export_func(exports, i++);
auto func_call = get_export_func(exports, i++);
// Create host references.
std::cout << "Creating host references..." << std::endl;
auto host1 = wasm::Foreign::make(store);
auto host2 = wasm::Foreign::make(store);
host1->set_host_info(reinterpret_cast<void*>(1));
host2->set_host_info(reinterpret_cast<void*>(2));
// Some sanity checks.
check(nullptr, nullptr);
check(host1->copy(), host1.get());
check(host2->copy(), host2.get());
wasm::Val val = wasm::Val::ref(host1->copy());
check(val.ref()->copy(), host1.get());
auto ref = val.release_ref();
assert(val.ref() == nullptr);
check(ref->copy(), host1.get());
// Interact.
std::cout << "Accessing global..." << std::endl;
check(call_v_r(global_get), nullptr);
call_r_v(global_set, host1.get());
check(call_v_r(global_get), host1.get());
call_r_v(global_set, host2.get());
check(call_v_r(global_get), host2.get());
call_r_v(global_set, nullptr);
check(call_v_r(global_get), nullptr);
check(global->get().release_ref(), nullptr);
global->set(wasm::Val(host2->copy()));
check(call_v_r(global_get), host2.get());
check(global->get().release_ref(), host2.get());
std::cout << "Accessing table..." << std::endl;
check(call_i_r(table_get, 0), nullptr);
check(call_i_r(table_get, 1), nullptr);
call_ir_v(table_set, 0, host1.get());
call_ir_v(table_set, 1, host2.get());
check(call_i_r(table_get, 0), host1.get());
check(call_i_r(table_get, 1), host2.get());
call_ir_v(table_set, 0, nullptr);
check(call_i_r(table_get, 0), nullptr);
check(table->get(2), nullptr);
table->set(2, host1.get());
check(call_i_r(table_get, 2), host1.get());
check(table->get(2), host1.get());
std::cout << "Accessing function..." << std::endl;
check(call_r_r(func_call, nullptr), nullptr);
check(call_r_r(func_call, host1.get()), host1.get());
check(call_r_r(func_call, host2.get()), host2.get());
// Shut down.
std::cout << "Shutting down..." << std::endl;
}
int main(int argc, const char* argv[]) {
run();
std::cout << "Done." << std::endl;
return 0;
}
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