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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* neg_callback(
const wasm_val_t args[], wasm_val_t results[]
) {
printf("Calling back...\n");
results[0].kind = WASM_I32;
results[0].of.i32 = -args[0].of.i32;
return NULL;
}
wasm_table_t* get_export_table(const wasm_extern_vec_t* exports, size_t i) {
if (exports->size <= i || !wasm_extern_as_table(exports->data[i])) {
printf("> Error accessing table export %zu!\n", i);
exit(1);
}
return wasm_extern_as_table(exports->data[i]);
}
wasm_func_t* get_export_func(const wasm_extern_vec_t* exports, size_t i) {
if (exports->size <= i || !wasm_extern_as_func(exports->data[i])) {
printf("> Error accessing function export %zu!\n", i);
exit(1);
}
return wasm_extern_as_func(exports->data[i]);
}
void check(bool success) {
if (!success) {
printf("> Error, expected success\n");
exit(1);
}
}
void check_table(wasm_table_t* table, int32_t i, bool expect_set) {
own wasm_ref_t* ref = wasm_table_get(table, i);
check((ref != NULL) == expect_set);
if (ref) wasm_ref_delete(ref);
}
void check_call(wasm_func_t* func, int32_t arg1, int32_t arg2, int32_t expected) {
wasm_val_t args[2] = {
{.kind = WASM_I32, .of = {.i32 = arg1}},
{.kind = WASM_I32, .of = {.i32 = arg2}}
};
wasm_val_t results[1];
if (wasm_func_call(func, args, results) || results[0].of.i32 != expected) {
printf("> Error on result\n");
exit(1);
}
}
void check_trap(wasm_func_t* func, int32_t arg1, int32_t arg2) {
wasm_val_t args[2] = {
{.kind = WASM_I32, .of = {.i32 = arg1}},
{.kind = WASM_I32, .of = {.i32 = arg2}}
};
own wasm_trap_t* trap = wasm_func_call(func, args, NULL);
if (! trap) {
printf("> Error on result, expected trap\n");
exit(1);
}
wasm_trap_delete(trap);
}
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("table.wasm", "r");
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);
// Instantiate.
printf("Instantiating module...\n");
own wasm_instance_t* instance = wasm_instance_new(store, module, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return 1;
}
// Extract export.
printf("Extracting exports...\n");
own wasm_extern_vec_t exports;
wasm_instance_exports(instance, &exports);
size_t i = 0;
wasm_table_t* table = get_export_table(&exports, i++);
wasm_func_t* call_indirect = get_export_func(&exports, i++);
wasm_func_t* f = get_export_func(&exports, i++);
wasm_func_t* g = get_export_func(&exports, i++);
wasm_module_delete(module);
// Create external function.
printf("Creating callback...\n");
own wasm_functype_t* neg_type = wasm_functype_new_1_1(wasm_valtype_new_i32(), wasm_valtype_new_i32());
own wasm_func_t* h = wasm_func_new(store, neg_type, neg_callback);
wasm_functype_delete(neg_type);
// Check initial table.
printf("Checking table...\n");
check(wasm_table_size(table) == 2);
check_table(table, 0, false);
check_table(table, 1, true);
check_trap(call_indirect, 0, 0);
check_call(call_indirect, 7, 1, 7);
check_trap(call_indirect, 0, 2);
// Mutate table.
printf("Mutating table...\n");
check(wasm_table_set(table, 0, wasm_func_as_ref(g)));
check(wasm_table_set(table, 1, NULL));
check(! wasm_table_set(table, 2, wasm_func_as_ref(f)));
check_table(table, 0, true);
check_table(table, 1, false);
check_call(call_indirect, 7, 0, 666);
check_trap(call_indirect, 0, 1);
check_trap(call_indirect, 0, 2);
// Grow table.
printf("Growing table...\n");
check(wasm_table_grow(table, 3, NULL));
check(wasm_table_size(table) == 5);
check(wasm_table_set(table, 2, wasm_func_as_ref(f)));
check(wasm_table_set(table, 3, wasm_func_as_ref(h)));
check(! wasm_table_set(table, 5, NULL));
check_table(table, 2, true);
check_table(table, 3, true);
check_table(table, 4, false);
check_call(call_indirect, 5, 2, 5);
check_call(call_indirect, 6, 3, -6);
check_trap(call_indirect, 0, 4);
check_trap(call_indirect, 0, 5);
check(wasm_table_grow(table, 2, wasm_func_as_ref(f)));
check(wasm_table_size(table) == 7);
check_table(table, 5, true);
check_table(table, 6, true);
check(! wasm_table_grow(table, 5, NULL));
check(wasm_table_grow(table, 3, NULL));
check(wasm_table_grow(table, 0, NULL));
wasm_func_delete(h);
wasm_extern_vec_delete(&exports);
wasm_instance_delete(instance);
// Create stand-alone table.
// TODO(wasm+): Once Wasm allows multiple tables, turn this into import.
printf("Creating stand-alone table...\n");
wasm_limits_t limits = {5, 5};
own wasm_tabletype_t* tabletype =
wasm_tabletype_new(wasm_valtype_new(WASM_FUNCREF), &limits);
own wasm_table_t* table2 = wasm_table_new(store, tabletype, NULL);
check(wasm_table_size(table2) == 5);
check(! wasm_table_grow(table2, 1, NULL));
check(wasm_table_grow(table2, 0, NULL));
wasm_tabletype_delete(tabletype);
wasm_table_delete(table2);
// 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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