diff options
Diffstat (limited to 'deps/v8/third_party/wasm-api/example/hello.cc')
-rw-r--r-- | deps/v8/third_party/wasm-api/example/hello.cc | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/deps/v8/third_party/wasm-api/example/hello.cc b/deps/v8/third_party/wasm-api/example/hello.cc new file mode 100644 index 0000000000..4956be885f --- /dev/null +++ b/deps/v8/third_party/wasm-api/example/hello.cc @@ -0,0 +1,91 @@ +#include <iostream> +#include <fstream> +#include <cstdlib> +#include <string> +#include <cinttypes> + +#include "wasm.hh" + + +// A function to be called from Wasm code. +auto hello_callback( + const wasm::Val args[], wasm::Val results[] +) -> wasm::own<wasm::Trap*> { + std::cout << "Calling back..." << std::endl; + std::cout << "> Hello world!" << std::endl; + return nullptr; +} + + +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("hello.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 print functions. + std::cout << "Creating callback..." << std::endl; + auto hello_type = wasm::FuncType::make( + wasm::vec<wasm::ValType*>::make(), wasm::vec<wasm::ValType*>::make() + ); + auto hello_func = wasm::Func::make(store, hello_type.get(), hello_callback); + + // Instantiate. + std::cout << "Instantiating module..." << std::endl; + wasm::Extern* imports[] = {hello_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 export..." << std::endl; + auto exports = instance->exports(); + if (exports.size() == 0 || exports[0]->kind() != wasm::EXTERN_FUNC || !exports[0]->func()) { + std::cout << "> Error accessing export!" << std::endl; + return; + } + auto run_func = exports[0]->func(); + + // Call. + std::cout << "Calling export..." << std::endl; + if (run_func->call()) { + std::cout << "> Error calling function!" << std::endl; + return; + } + + // Shut down. + std::cout << "Shutting down..." << std::endl; +} + + +int main(int argc, const char* argv[]) { + run(); + std::cout << "Done." << std::endl; + return 0; +} + |