918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
#include <iostream>
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#include <fstream>
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#include <cstdlib>
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#include <string>
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#include <cinttypes>
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#include "wasm.hh"
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// A function to be called from Wasm code.
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auto hello_callback(const wasm::vec<wasm::Val>& args,
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wasm::vec<wasm::Val>& results) -> wasm::own<wasm::Trap> {
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std::cout << "Calling back..." << std::endl;
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std::cout << "> Hello world!" << std::endl;
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return nullptr;
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}
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void run() {
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// Initialize.
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std::cout << "Initializing..." << std::endl;
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auto engine = wasm::Engine::make();
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auto store_ = wasm::Store::make(engine.get());
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auto store = store_.get();
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// Load binary.
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std::cout << "Loading binary..." << std::endl;
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std::ifstream file("hello.wasm");
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file.seekg(0, std::ios_base::end);
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auto file_size = file.tellg();
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file.seekg(0);
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auto binary = wasm::vec<byte_t>::make_uninitialized(file_size);
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file.read(binary.get(), file_size);
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file.close();
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if (file.fail()) {
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std::cout << "> Error loading module!" << std::endl;
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exit(1);
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}
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// Validate.
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std::cout << "Validating module..." << std::endl;
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if (!wasm::Module::validate(store, binary)) {
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std::cout << "> Error validating module!" << std::endl;
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exit(1);
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}
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// Compile.
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std::cout << "Compiling module..." << std::endl;
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auto module = wasm::Module::make(store, binary);
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if (!module) {
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std::cout << "> Error compiling module!" << std::endl;
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exit(1);
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}
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// Create external print functions.
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std::cout << "Creating callback..." << std::endl;
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auto hello_type = wasm::FuncType::make(
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wasm::ownvec<wasm::ValType>::make(), wasm::ownvec<wasm::ValType>::make()
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);
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auto hello_func = wasm::Func::make(store, hello_type.get(), hello_callback);
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// Instantiate.
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std::cout << "Instantiating module..." << std::endl;
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auto imports = wasm::vec<wasm::Extern*>::make(hello_func.get());
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auto instance = wasm::Instance::make(store, module.get(), imports);
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if (!instance) {
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std::cout << "> Error instantiating module!" << std::endl;
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exit(1);
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}
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// Extract export.
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std::cout << "Extracting export..." << std::endl;
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auto exports = instance->exports();
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if (exports.size() == 0 || exports[0]->kind() != wasm::ExternKind::FUNC ||
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!exports[0]->func()) {
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std::cout << "> Error accessing export!" << std::endl;
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exit(1);
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}
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auto run_func = exports[0]->func();
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// Call.
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std::cout << "Calling export..." << std::endl;
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auto args = wasm::vec<wasm::Val>::make();
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auto results = wasm::vec<wasm::Val>::make();
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if (run_func->call(args, results)) {
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std::cout << "> Error calling function!" << std::endl;
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exit(1);
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}
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// Shut down.
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std::cout << "Shutting down..." << std::endl;
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}
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int main(int argc, const char* argv[]) {
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run();
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std::cout << "Done." << std::endl;
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return 0;
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}
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