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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "wasm.h"
#define own
// A function to be called from Wasm code.
own wasm_trap_t* callback(
const wasm_val_t args[], wasm_val_t results[]
) {
printf("Calling back...\n> ");
printf("> %"PRIu32" %"PRIu64" %"PRIu64" %"PRIu32"\n",
args[0].of.i32, args[1].of.i64, args[2].of.i64, args[3].of.i32);
printf("\n");
wasm_val_copy(&results[0], &args[0]);
return NULL;
}
// A function closure.
own wasm_trap_t* closure_callback(
void* env, const wasm_val_t args[], wasm_val_t results[]
) {
int i = *(int*)env;
printf("Calling back closure...\n");
printf("> %d\n", i);
results[0].kind = WASM_I32;
results[0].of.i32 = (int32_t)i;
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("multi.wasm", "r");
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);
// Create external print functions.
printf("Creating callback...\n");
wasm_valtype_t* types[4] = {
wasm_valtype_new_i32(), wasm_valtype_new_i64(),
wasm_valtype_new_i64(), wasm_valtype_new_i32()
};
own wasm_valtype_vec_t tuple1, tuple2;
wasm_valtype_vec_new(&tuple1, 4, types);
wasm_valtype_vec_copy(&tuple2, &tuple1);
own wasm_functype_t* callback_type = wasm_functype_new(&tuple1, &tuple2);
own wasm_func_t* callback_func =
wasm_func_new(store, callback_type, callback);
wasm_functype_delete(callback_type);
// Instantiate.
printf("Instantiating module...\n");
const wasm_extern_t* imports[] = {wasm_func_as_extern(callback_func)};
own wasm_instance_t* instance =
wasm_instance_new(store, module, imports, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return 1;
}
wasm_func_delete(callback_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(module);
wasm_instance_delete(instance);
// Call.
printf("Calling export...\n");
wasm_val_t args[4];
args[0].kind = WASM_I32;
args[0].of.i32 = 1;
args[1].kind = WASM_I64;
args[1].of.i64 = 2;
args[2].kind = WASM_I64;
args[2].of.i64 = 3;
args[3].kind = WASM_I32;
args[3].of.i32 = 4;
wasm_val_t results[4];
if (wasm_func_call(run_func, args, results)) {
printf("> Error calling function!\n");
return 1;
}
wasm_extern_vec_delete(&exports);
// Print result.
printf("Printing result...\n");
printf("> %"PRIu32" %"PRIu64" %"PRIu64" %"PRIu32"\n",
results[0].of.i32, results[1].of.i64,
results[2].of.i64, results[3].of.i32);
assert(results[0].of.i32 == 4);
assert(results[1].of.i64 == 3);
assert(results[2].of.i64 == 2);
assert(results[3].of.i32 == 1);
// 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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