100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <wasm.h>
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#include "wasmtime.h"
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#define own
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int main(int argc, const char* argv[]) {
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// Configuring engine to support generating of DWARF info.
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// lldb can be used to attach to the program and observe
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// original fib-wasm.c source code and variables.
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wasm_config_t* config = wasm_config_new();
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wasmtime_config_debug_info_set(config, true);
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// Initialize.
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printf("Initializing...\n");
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wasm_engine_t* engine = wasm_engine_new_with_config(config);
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wasm_store_t* store = wasm_store_new(engine);
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// Load binary.
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printf("Loading binary...\n");
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FILE* file = fopen("fib-wasm.wasm", "r");
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if (!file) {
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printf("> Error loading module!\n");
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return 1;
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}
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fseek(file, 0L, SEEK_END);
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size_t file_size = ftell(file);
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fseek(file, 0L, SEEK_SET);
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wasm_byte_vec_t binary;
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wasm_byte_vec_new_uninitialized(&binary, file_size);
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if (fread(binary.data, file_size, 1, file) != 1) {
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printf("> Error loading module!\n");
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return 1;
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}
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fclose(file);
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// Compile.
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printf("Compiling module...\n");
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own wasm_module_t* module = wasm_module_new(store, &binary);
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if (!module) {
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printf("> Error compiling module!\n");
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return 1;
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}
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wasm_byte_vec_delete(&binary);
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// Instantiate.
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printf("Instantiating module...\n");
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own wasm_instance_t* instance =
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wasm_instance_new(store, module, NULL, NULL);
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if (!instance) {
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printf("> Error instantiating module!\n");
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return 1;
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}
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// Extract export.
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printf("Extracting export...\n");
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own wasm_extern_vec_t exports;
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wasm_instance_exports(instance, &exports);
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if (exports.size == 0) {
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printf("> Error accessing exports!\n");
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return 1;
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}
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// Getting second export (first is memory).
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const wasm_func_t* run_func = wasm_extern_as_func(exports.data[1]);
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if (run_func == NULL) {
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printf("> Error accessing export!\n");
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return 1;
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}
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wasm_module_delete(module);
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wasm_instance_delete(instance);
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// Call.
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printf("Calling fib...\n");
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wasm_val_t params[1] = { {.kind = WASM_I32, .of = {.i32 = 6}} };
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wasm_val_t results[1];
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if (wasm_func_call(run_func, params, results)) {
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printf("> Error calling function!\n");
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return 1;
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}
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wasm_extern_vec_delete(&exports);
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printf("> fib(6) = %d\n", results[0].of.i32);
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// Shut down.
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printf("Shutting down...\n");
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wasm_store_delete(store);
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wasm_engine_delete(engine);
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// All done.
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printf("Done.\n");
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return 0;
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}
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