mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-13 14:25:32 +00:00
100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
#include <stdio.h>
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#include "../wasmer.h"
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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typedef struct {
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int32_t amount;
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int32_t value;
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} counter_data;
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void inc_counter(wasmer_instance_context_t *ctx) {
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counter_data* data = (counter_data*)wasmer_instance_context_data_get(ctx);
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data->value = data->value + data->amount;
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}
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int32_t get_counter(wasmer_instance_context_t *ctx) {
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counter_data* data = (counter_data*)wasmer_instance_context_data_get(ctx);
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return data->value;
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}
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wasmer_import_t create_import(char* module_name, char* import_name, wasmer_import_func_t *func) {
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wasmer_import_t import;
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wasmer_byte_array module_name_bytes;
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wasmer_byte_array import_name_bytes;
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module_name_bytes.bytes = (const uint8_t *) module_name;
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module_name_bytes.bytes_len = strlen(module_name);
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import_name_bytes.bytes = (const uint8_t *) import_name;
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import_name_bytes.bytes_len = strlen(import_name);
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import.module_name = module_name_bytes;
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import.import_name = import_name_bytes;
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import.tag = WASM_FUNCTION;
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import.value.func = func;
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return import;
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}
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int main()
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{
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// Imports
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wasmer_value_tag inc_params_sig[] = {};
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wasmer_value_tag inc_returns_sig[] = {};
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wasmer_import_func_t *inc_func = wasmer_import_func_new((void (*)(void *)) inc_counter, inc_params_sig, 0, inc_returns_sig, 0);
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wasmer_import_t inc_import = create_import("env", "inc", inc_func);
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wasmer_value_tag get_params_sig[] = {};
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wasmer_value_tag get_returns_sig[] = {WASM_I32};
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wasmer_import_func_t *get_func = wasmer_import_func_new((void (*)(void *)) get_counter, get_params_sig, 0, get_returns_sig, 1);
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wasmer_import_t get_import = create_import("env", "get", get_func);
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wasmer_import_t imports[] = {inc_import, get_import};
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// Read the wasm file bytes
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FILE *file = fopen("assets/inc.wasm", "r");
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fseek(file, 0, SEEK_END);
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long len = ftell(file);
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uint8_t *bytes = malloc(len);
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fseek(file, 0, SEEK_SET);
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fread(bytes, 1, len, file);
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fclose(file);
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printf("Instantiating\n");
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wasmer_instance_t *instance = NULL;
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wasmer_result_t compile_result = wasmer_instantiate(&instance, bytes, len, imports, 2);
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printf("Compile result: %d\n", compile_result);
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counter_data* counter = malloc(sizeof(counter_data));
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counter->value = 2;
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counter->amount = 5;
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wasmer_instance_context_data_set(instance, counter);
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wasmer_value_t result_one;
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wasmer_value_t params[] = {};
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wasmer_value_t results[] = {result_one};
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wasmer_result_t call1_result = wasmer_instance_call(instance, "inc_and_get", params, 0, results, 1);
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printf("Call result: %d\n", call1_result);
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printf("Result: %d\n", results[0].value.I32);
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assert(results[0].value.I32 == 7);
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assert(call1_result == WASMER_OK);
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wasmer_result_t call2_result = wasmer_instance_call(instance, "inc_and_get", params, 0, results, 1);
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printf("Call result: %d\n", call2_result);
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printf("Result: %d\n", results[0].value.I32);
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assert(results[0].value.I32 == 12);
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assert(call2_result == WASMER_OK);
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wasmer_import_func_destroy(inc_func);
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wasmer_import_func_destroy(get_func);
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wasmer_instance_destroy(instance);
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free(counter);
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free(bytes);
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return 0;
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}
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