mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-13 06:15:33 +00:00
64 lines
2.1 KiB
C
64 lines
2.1 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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static print_str_called = false;
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static memory_len = 0;
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static ptr_len = 0;
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static char actual_str[14] = {};
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void print_str(int32_t ptr, int32_t len, wasmer_instance_context_t *ctx)
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{
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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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}
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int main()
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{
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wasmer_import_object_t *import_object = wasmer_import_object_new();
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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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wasmer_imports_set_import_func(import_object, "env", "print_str", print_str, params_sig, 2, returns_sig, 0);
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// Read the wasm file bytes
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FILE *file = fopen("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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wasmer_instance_t *instance = NULL;
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wasmer_result_t compile_result = wasmer_instantiate(&instance, bytes, len, import_object);
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printf("Compile result: %d\n", compile_result);
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assert(compile_result == WASMER_OK);
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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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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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// printf("Destroy instance\n");
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// wasmer_instance_destroy(instance);
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printf("Destroy import object\n");
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wasmer_import_object_destroy(import_object);
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return 0;
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} |