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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "wasm.h"
#define own
// A function to be called from Wasm code.
own wasm_trap_t* fail_callback(
void* env, const wasm_val_vec_t* args, wasm_val_vec_t* results
) {
printf("Calling back...\n");
own wasm_name_t message;
wasm_name_new_from_string_nt(&message, "callback abort");
own wasm_trap_t* trap = wasm_trap_new((wasm_store_t*)env, &message);
wasm_name_delete(&message);
return trap;
}
void print_frame(wasm_frame_t* frame) {
printf("> %p @ 0x%zx = %"PRIu32".0x%zx\n",
wasm_frame_instance(frame),
wasm_frame_module_offset(frame),
wasm_frame_func_index(frame),
wasm_frame_func_offset(frame)
);
}
int main(int argc, const char* argv[]) {
// Initialize.
printf("Initializing...\n");
wasm_engine_t* engine = wasm_engine_new();
wasm_store_t* store = wasm_store_new(engine);
// Load binary.
printf("Loading binary...\n");
FILE* file = fopen("trap.wasm", "rb");
if (!file) {
printf("> Error loading module!\n");
return 1;
}
fseek(file, 0L, SEEK_END);
size_t file_size = ftell(file);
fseek(file, 0L, SEEK_SET);
wasm_byte_vec_t binary;
wasm_byte_vec_new_uninitialized(&binary, file_size);
if (fread(binary.data, file_size, 1, file) != 1) {
printf("> Error loading module!\n");
return 1;
}
fclose(file);
// Compile.
printf("Compiling module...\n");
own wasm_module_t* module = wasm_module_new(store, &binary);
if (!module) {
printf("> Error compiling module!\n");
return 1;
}
wasm_byte_vec_delete(&binary);
// Create external print functions.
printf("Creating callback...\n");
own wasm_functype_t* fail_type =
wasm_functype_new_0_1(wasm_valtype_new_i32());
own wasm_func_t* fail_func =
wasm_func_new_with_env(store, fail_type, fail_callback, store, NULL);
wasm_functype_delete(fail_type);
// Instantiate.
printf("Instantiating module...\n");
wasm_extern_t* externs[] = { wasm_func_as_extern(fail_func) };
wasm_extern_vec_t imports = WASM_ARRAY_VEC(externs);
own wasm_instance_t* instance =
wasm_instance_new(store, module, &imports, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return 1;
}
wasm_func_delete(fail_func);
// Extract export.
printf("Extracting exports...\n");
own wasm_extern_vec_t exports;
wasm_instance_exports(instance, &exports);
if (exports.size < 2) {
printf("> Error accessing exports!\n");
return 1;
}
wasm_module_delete(module);
wasm_instance_delete(instance);
// Call.
for (int i = 0; i < 2; ++i) {
const wasm_func_t* func = wasm_extern_as_func(exports.data[i]);
if (func == NULL) {
printf("> Error accessing export!\n");
return 1;
}
printf("Calling export %d...\n", i);
wasm_val_vec_t args = WASM_EMPTY_VEC;
wasm_val_vec_t results = WASM_EMPTY_VEC;
own wasm_trap_t* trap = wasm_func_call(func, &args, &results);
if (!trap) {
printf("> Error calling function, expected trap!\n");
return 1;
}
printf("Printing message...\n");
own wasm_name_t message;
wasm_trap_message(trap, &message);
printf("> %s\n", message.data);
printf("Printing origin...\n");
own wasm_frame_t* frame = wasm_trap_origin(trap);
if (frame) {
print_frame(frame);
wasm_frame_delete(frame);
} else {
printf("> Empty origin.\n");
}
printf("Printing trace...\n");
own wasm_frame_vec_t trace;
wasm_trap_trace(trap, &trace);
if (trace.size > 0) {
for (size_t i = 0; i < trace.size; ++i) {
print_frame(trace.data[i]);
}
} else {
printf("> Empty trace.\n");
}
wasm_frame_vec_delete(&trace);
wasm_trap_delete(trap);
wasm_name_delete(&message);
}
wasm_extern_vec_delete(&exports);
// Shut down.
printf("Shutting down...\n");
wasm_store_delete(store);
wasm_engine_delete(engine);
// All done.
printf("Done.\n");
return 0;
}
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