mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-13 14:25:32 +00:00
75 lines
2.5 KiB
C
75 lines
2.5 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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int main()
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{
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// Read the wasm file bytes
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FILE *file = fopen("assets/return_hello.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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// Instantiate the module.
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wasmer_import_t imports[] = {};
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wasmer_instance_t *instance = NULL;
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wasmer_result_t compile_result = wasmer_instantiate(&instance, bytes, len, imports, 0);
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printf("Compile result: %d\n", compile_result);
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assert(compile_result == WASMER_OK);
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// Call the `return_hello` function.
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wasmer_value_t params[] = {};
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wasmer_value_t result;
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wasmer_value_t results[] = {result};
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wasmer_result_t call_result = wasmer_instance_call(instance, "return_hello", params, 0, results, 1);
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printf("Call result: %d\n", call_result);
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printf("Result: %d\n", results[0].value.I32);
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assert(call_result == WASMER_OK);
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assert(results[0].value.I32 == 1048576);
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// Get all exports.
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wasmer_exports_t *exports = NULL;
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wasmer_instance_exports(instance, &exports);
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int export_length = wasmer_exports_len(exports);
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printf("exports_length: %d\n", export_length);
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assert(export_length == 5);
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// Get the `memory` export.
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wasmer_export_t *export = wasmer_exports_get(exports, 0);
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wasmer_import_export_kind kind = wasmer_export_kind(export);
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printf("Wasmer import export kind: %d (Memory is %d)\n", kind, WASM_MEMORY);
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assert(kind == WASM_MEMORY);
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wasmer_byte_array export_name = wasmer_export_name(export);
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printf("export_name: `%.*s`\n", export_name.bytes_len, export_name.bytes);
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// Cast the export into a memory.
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wasmer_memory_t *memory;
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wasmer_result_t export_to_memory_result = wasmer_export_to_memory(export, &memory);
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printf("Export to memory result: %d\n", export_to_memory_result);
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printf("Memory pointer: %p\n", memory);
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assert(export_to_memory_result == WASMER_OK);
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uint32_t memory_length = wasmer_memory_length(memory);
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assert(memory_length == 17);
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// Read the data from the memory.
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uint8_t *memory_data = wasmer_memory_data(memory);
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uint8_t *returned_string = memory_data + results[0].value.I32;
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printf("Returned string from Wasm: %s\n", returned_string);
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assert(strcmp("Hello, World!", (const char *) returned_string) == 0);
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printf("Destroy instance\n");
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wasmer_instance_destroy(instance);
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return 0;
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}
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