90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
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#include <cstdio>
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#include <cstring>
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#include <fstream>
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#include "wasm3_cpp.h"
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#include "wasm/test_prog.wasm.h"
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int sum(int a, int b)
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{
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return a + b;
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}
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void * ext_memcpy (void* dst, const void* arg, int32_t size)
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{
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return memcpy(dst, arg, (size_t) size);
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}
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int main(void)
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{
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std::cout << "Loading WebAssembly..." << std::endl;
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/* Wasm module can be loaded from a file */
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try {
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wasm3::environment env;
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wasm3::runtime runtime = env.new_runtime(1024);
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const char* file_name = "wasm/test_prog.wasm";
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std::ifstream wasm_file(file_name, std::ios::binary | std::ios::in);
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if (!wasm_file.is_open()) {
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throw std::runtime_error("Failed to open wasm file");
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}
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wasm3::module mod = env.parse_module(wasm_file);
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runtime.load(mod);
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}
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catch(std::runtime_error &e) {
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std::cerr << "WASM3 error: " << e.what() << std::endl;
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return 1;
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}
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/* Wasm module can also be loaded from an array */
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try {
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wasm3::environment env;
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wasm3::runtime runtime = env.new_runtime(1024);
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wasm3::module mod = env.parse_module(test_prog_wasm, test_prog_wasm_len);
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runtime.load(mod);
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mod.link("*", "sum", sum);
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mod.link("*", "ext_memcpy", ext_memcpy);
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{
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wasm3::function test_fn = runtime.find_function("test");
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auto res = test_fn.call<int>(20, 10);
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std::cout << "result: " << res << std::endl;
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}
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{
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wasm3::function memcpy_test_fn = runtime.find_function("test_memcpy");
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auto res = memcpy_test_fn.call<int64_t>();
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std::cout << "result: 0x" << std::hex << res << std::dec << std::endl;
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}
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/**
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* Calling functions that modify an internal state, with mixed argument / return types
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*/
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{
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wasm3::function counter_get_fn = runtime.find_function("test_counter_get");
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wasm3::function counter_inc_fn = runtime.find_function("test_counter_inc");
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wasm3::function counter_add_fn = runtime.find_function("test_counter_add");
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// call with no arguments and a return value
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auto value = counter_get_fn.call<int32_t>();
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std::cout << "counter: " << value << std::endl;
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// call with no arguments and no return value
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counter_inc_fn.call();
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value = counter_get_fn.call<int32_t>();
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std::cout << "counter after increment: " << value << std::endl;
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// call with one argument and no return value
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counter_add_fn.call(42);
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value = counter_get_fn.call<int32_t>();
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std::cout << "counter after adding value: " << value << std::endl;
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}
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}
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catch(wasm3::error &e) {
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std::cerr << "WASM3 error: " << e.what() << std::endl;
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return 1;
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}
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return 0;
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}
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