mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-16 07:35:40 +00:00
133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
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#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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static bool print_str_called = false;
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static int memory_len = 0;
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static int ptr_len = 0;
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static char actual_str[14] = {};
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static int actual_context_data_value = 0;
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typedef struct {
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int value;
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} context_data;
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struct print_str_context {
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int call_count;
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};
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void print_str(struct print_str_context *local_context, uint64_t *args)
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{
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local_context->call_count++;
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wasmer_instance_context_t *ctx = (void *) args[0];
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int32_t ptr = args[1];
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int32_t len = args[2];
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const wasmer_memory_t *memory = wasmer_instance_context_memory(ctx, 0);
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uint32_t mem_len = wasmer_memory_length(memory);
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uint8_t *mem_bytes = wasmer_memory_data(memory);
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for (int32_t idx = 0; idx < len; idx++)
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{
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actual_str[idx] = mem_bytes[ptr + idx];
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}
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actual_str[13] = '\0';
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printf("In print_str, memory len: %d, ptr_len: %d\n, str %s", mem_len, len, actual_str);
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print_str_called = true;
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memory_len = mem_len;
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ptr_len = len;
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actual_context_data_value = ((context_data *) wasmer_instance_context_data_get(ctx))->value;
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}
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int main()
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{
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wasmer_value_tag params_sig[] = {WASM_I32, WASM_I32};
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wasmer_value_tag returns_sig[] = {};
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struct print_str_context local_context = {
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.call_count = 0
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};
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printf("Creating trampoline buffer\n");
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wasmer_trampoline_buffer_builder_t *tbb = wasmer_trampoline_buffer_builder_new();
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unsigned long print_str_idx = wasmer_trampoline_buffer_builder_add_callinfo_trampoline(
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tbb,
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(wasmer_trampoline_callable_t *) print_str,
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(void *) &local_context,
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3
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);
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wasmer_trampoline_buffer_t *tb = wasmer_trampoline_buffer_builder_build(tbb);
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const wasmer_trampoline_callable_t *print_str_callable = wasmer_trampoline_buffer_get_trampoline(tb, print_str_idx);
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printf("Creating new func\n");
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wasmer_import_func_t *func = wasmer_import_func_new((void (*)(void *)) print_str_callable, params_sig, 2, returns_sig, 0);
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wasmer_import_t import;
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char *module_name = "env";
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wasmer_byte_array module_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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char *import_name = "print_str";
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wasmer_byte_array import_name_bytes;
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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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wasmer_import_t imports[] = {import};
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// Read the wasm file bytes
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FILE *file = fopen("assets/wasm_sample_app.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, 1);
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printf("Compile result: %d\n", compile_result);
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assert(compile_result == WASMER_OK);
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context_data* context_data = malloc(sizeof(context_data));
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int context_data_value = 42;
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context_data->value = context_data_value;
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wasmer_instance_context_data_set(instance, context_data);
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wasmer_value_t params[] = {};
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wasmer_value_t results[] = {};
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wasmer_result_t call_result = wasmer_instance_call(instance, "hello_wasm", params, 0, results, 0);
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printf("Call result: %d\n", call_result);
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int error_len = wasmer_last_error_length();
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printf("Error len: `%d`\n", error_len);
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char *error_str = malloc(error_len);
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wasmer_last_error_message(error_str, error_len);
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printf("Error str: `%s`\n", error_str);
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assert(call_result == WASMER_OK);
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assert(print_str_called);
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assert(memory_len == 17);
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assert(ptr_len == 13);
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assert(0 == strcmp(actual_str, "Hello, World!"));
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assert(context_data_value == actual_context_data_value);
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assert(local_context.call_count == 1);
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printf("Destroying trampoline buffer\n");
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wasmer_trampoline_buffer_destroy(tb);
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printf("Destroying func\n");
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wasmer_import_func_destroy(func);
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printf("Destroy instance\n");
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wasmer_instance_destroy(instance);
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free(context_data);
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return 0;
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}
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