wasmer-c-api:

* adding `wasmer_import_object_new` and `wasmer_import_object_extend`
* adding test file `test-module-import-instantiate.c`

lib/runtime-c-api/tests/test-module-import-instantiate.c

@@ -0,0 +1,148 @@
+#include <stdio.h>
+#include "../wasmer.h"
+#include <assert.h>
+#include <stdint.h>
+#include <string.h>
+
+typedef struct {
+    int32_t amount;
+    int32_t value;
+} counter_data;
+
+typedef struct {
+    uint8_t* bytes;
+    long bytes_len;
+} wasm_file_t;
+
+wasm_file_t read_wasm_file(const char* file_name) {
+    wasm_file_t wasm_file;
+
+    FILE *file = fopen(file_name, "r");
+    fseek(file, 0, SEEK_END);
+    wasm_file.bytes_len = ftell(file);
+
+    wasm_file.bytes = malloc(wasm_file.bytes_len);
+    fseek(file, 0, SEEK_SET);
+    fread(wasm_file.bytes, 1, wasm_file.bytes_len, file);
+    fclose(file);
+
+    return wasm_file;
+}
+
+void inc_counter(wasmer_instance_context_t *ctx) {
+    counter_data* data = (counter_data*)wasmer_instance_context_data_get(ctx);
+    data->value = data->value + data->amount;
+}
+
+void mul_counter(wasmer_instance_context_t *ctx) {
+    counter_data* data = (counter_data*)wasmer_instance_context_data_get(ctx);
+    data->value = data->value * data->amount;
+}
+
+int32_t get_counter(wasmer_instance_context_t *ctx) {
+    counter_data* data = (counter_data*)wasmer_instance_context_data_get(ctx);
+    return data->value;
+}
+
+counter_data *init_counter(int32_t value, int32_t amount) {
+    counter_data* counter = malloc(sizeof(counter_data));
+    counter->value = value;
+    counter->amount = amount;
+    return counter;
+}
+
+wasmer_import_t create_import(char* module_name, char* import_name, wasmer_import_func_t *func) {
+    wasmer_import_t import;
+    wasmer_byte_array module_name_bytes;
+    wasmer_byte_array import_name_bytes;
+
+    module_name_bytes.bytes = (const uint8_t *) module_name;
+    module_name_bytes.bytes_len = strlen(module_name);
+
+    import_name_bytes.bytes = (const uint8_t *) import_name;
+    import_name_bytes.bytes_len = strlen(import_name);
+
+    import.module_name = module_name_bytes;
+    import.import_name = import_name_bytes;
+
+    import.tag = WASM_FUNCTION;
+    import.value.func = func;
+
+    return import;
+}
+
+int main()
+{
+    // Prepare Imports
+    wasmer_value_tag inc_params_sig[] = {};
+    wasmer_value_tag inc_returns_sig[] = {};
+    wasmer_import_func_t *inc_func = wasmer_import_func_new((void (*)(void *)) inc_counter, inc_params_sig, 0, inc_returns_sig, 0);
+    wasmer_import_t inc_import = create_import("env", "inc", inc_func);
+
+    wasmer_value_tag mul_params_sig[] = {};
+    wasmer_value_tag mul_returns_sig[] = {};
+    wasmer_import_func_t *mul_func = wasmer_import_func_new((void (*)(void *)) mul_counter, mul_params_sig, 0, mul_returns_sig, 0);
+    wasmer_import_t mul_import = create_import("env", "mul", mul_func);
+
+    wasmer_value_tag get_params_sig[] = {};
+    wasmer_value_tag get_returns_sig[] = {WASM_I32};
+    wasmer_import_func_t *get_func = wasmer_import_func_new((void (*)(void *)) get_counter, get_params_sig, 0, get_returns_sig, 1);
+    wasmer_import_t get_import = create_import("env", "get", get_func);
+
+    // Read the wasm file
+    wasm_file_t wasm_file = read_wasm_file("assets/inc.wasm");
+
+    // Compile module
+		wasmer_module_t *module = NULL;
+		wasmer_result_t compile_res = wasmer_compile(&module, wasm_file.bytes, wasm_file.bytes_len);
+		assert(compile_res == WASMER_OK);
+
+		// Prepare Import Object
+    wasmer_import_object_t *import_object = wasmer_import_object_new();
+
+    // First, we import `inc_counter` and `mul_counter`
+    wasmer_import_t imports[] = {inc_import, mul_import};
+    wasmer_result_t extend_res = wasmer_import_object_extend(import_object, imports, 2);
+    assert(extend_res == WASMER_OK);
+
+    // Now, we'll import `inc_counter` and `mul_counter`
+    wasmer_import_t more_imports[] = {get_import};
+    wasmer_result_t extend_res2 = wasmer_import_object_extend(import_object, more_imports, 1);
+    assert(extend_res2 == WASMER_OK);
+
+    // Same `wasmer_import_object_extend` as the first, doesn't affect anything
+    wasmer_result_t extend_res3 = wasmer_import_object_extend(import_object, imports, 2);
+    assert(extend_res3 == WASMER_OK);
+
+    // Instantiate instance
+    printf("Instantiating\n");
+    wasmer_instance_t *instance = NULL;
+    wasmer_result_t instantiate_res = wasmer_module_import_instantiate(&instance, module, import_object);
+    printf("Compile result:  %d\n", instantiate_res);
+
+    // Init counter
+    counter_data *counter = init_counter(2, 5);
+    wasmer_instance_context_data_set(instance, counter);
+
+    wasmer_value_t result_one;
+    wasmer_value_t params[] = {};
+    wasmer_value_t results[] = {result_one};
+
+    wasmer_result_t call1_result = wasmer_instance_call(instance, "inc_and_get", params, 0, results, 1);
+    printf("Call result:  %d\n", call1_result);
+    printf("Result: %d\n", results[0].value.I32);
+
+    wasmer_result_t call2_result = wasmer_instance_call(instance, "mul_and_get", params, 0, results, 1);
+    printf("Call result:  %d\n", call2_result);
+    printf("Result: %d\n", results[0].value.I32);
+
+    // Clear resources
+    wasmer_import_func_destroy(inc_func);
+    wasmer_import_func_destroy(mul_func);
+    wasmer_import_func_destroy(get_func);
+    wasmer_instance_destroy(instance);
+    free(counter);
+    free(wasm_file.bytes);
+
+    return 0;
+}