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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "wasm_c_api.h"
#define own
// A function to be called from Wasm code.
own wasm_trap_t *
hello_callback(const wasm_val_vec_t *args, wasm_val_vec_t *results)
{
printf("Calling back...\n");
printf("> Hello World!\n");
return NULL;
}
int
main(int argc, const char *argv[])
{
// Initialize.
printf("Initializing...\n");
wasm_engine_t *engine = wasm_engine_new();
wasm_store_t *store = wasm_store_new(engine);
// Load binary.
printf("Loading binary...\n");
FILE *file = fopen("serialize.wasm", "rb");
if (!file) {
printf("> Error loading module!\n");
return 1;
}
fseek(file, 0L, SEEK_END);
size_t file_size = ftell(file);
fseek(file, 0L, SEEK_SET);
wasm_byte_vec_t binary;
wasm_byte_vec_new_uninitialized(&binary, file_size);
if (fread(binary.data, file_size, 1, file) != 1) {
printf("> Error loading module!\n");
return 1;
}
fclose(file);
// Compile.
printf("Compiling module...\n");
own wasm_module_t *module = wasm_module_new(store, &binary);
if (!module) {
printf("> Error compiling module!\n");
return 1;
}
wasm_byte_vec_delete(&binary);
// Serialize module.
printf("Serializing module...\n");
own wasm_byte_vec_t serialized;
wasm_module_serialize(module, &serialized);
wasm_module_delete(module);
// Deserialize module.
printf("Deserializing module...\n");
own wasm_module_t *deserialized =
wasm_module_deserialize(store, &serialized);
if (!deserialized) {
printf("> Error deserializing module!\n");
return 1;
}
wasm_byte_vec_delete(&serialized);
// Create external print functions.
printf("Creating callback...\n");
own wasm_functype_t *hello_type = wasm_functype_new_0_0();
own wasm_func_t *hello_func =
wasm_func_new(store, hello_type, hello_callback);
wasm_functype_delete(hello_type);
// Instantiate.
printf("Instantiating deserialized module...\n");
wasm_extern_t *externs[] = { wasm_func_as_extern(hello_func) };
wasm_extern_vec_t imports = WASM_ARRAY_VEC(externs);
own wasm_instance_t *instance =
wasm_instance_new(store, deserialized, &imports, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return 1;
}
wasm_func_delete(hello_func);
// Extract export.
printf("Extracting export...\n");
own wasm_extern_vec_t exports;
wasm_instance_exports(instance, &exports);
if (exports.size == 0) {
printf("> Error accessing exports!\n");
return 1;
}
const wasm_func_t *run_func = wasm_extern_as_func(exports.data[0]);
if (run_func == NULL) {
printf("> Error accessing export!\n");
return 1;
}
wasm_module_delete(deserialized);
wasm_instance_delete(instance);
// Call.
printf("Calling export...\n");
wasm_val_vec_t empty = WASM_EMPTY_VEC;
wasm_trap_t *trap = wasm_func_call(run_func, &empty, &empty);
if (trap) {
printf("> Error calling function!\n");
wasm_trap_delete(trap);
return 1;
}
wasm_extern_vec_delete(&exports);
// Shut down.
printf("Shutting down...\n");
wasm_store_delete(store);
wasm_engine_delete(engine);
// All done.
printf("Done.\n");
return 0;
}
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