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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "wasm.h"
#define own
void print_mutability(wasm_mutability_t mut) {
switch (mut) {
case WASM_VAR: printf("var"); break;
case WASM_CONST: printf("const"); break;
}
}
void print_limits(const wasm_limits_t* limits) {
printf("%ud", limits->min);
if (limits->max < wasm_limits_max_default) printf(" %ud", limits->max);
}
void print_valtype(const wasm_valtype_t* type) {
switch (wasm_valtype_kind(type)) {
case WASM_I32: printf("i32"); break;
case WASM_I64: printf("i64"); break;
case WASM_F32: printf("f32"); break;
case WASM_F64: printf("f64"); break;
case WASM_EXTERNREF: printf("externref"); break;
case WASM_FUNCREF: printf("funcref"); break;
}
}
void print_valtypes(const wasm_valtype_vec_t* types) {
bool first = true;
for (size_t i = 0; i < types->size; ++i) {
if (first) {
first = false;
} else {
printf(" ");
}
print_valtype(types->data[i]);
}
}
void print_externtype(const wasm_externtype_t* type) {
switch (wasm_externtype_kind(type)) {
case WASM_EXTERN_FUNC: {
const wasm_functype_t* functype =
wasm_externtype_as_functype_const(type);
printf("func ");
print_valtypes(wasm_functype_params(functype));
printf(" -> ");
print_valtypes(wasm_functype_results(functype));
} break;
case WASM_EXTERN_GLOBAL: {
const wasm_globaltype_t* globaltype =
wasm_externtype_as_globaltype_const(type);
printf("global ");
print_mutability(wasm_globaltype_mutability(globaltype));
printf(" ");
print_valtype(wasm_globaltype_content(globaltype));
} break;
case WASM_EXTERN_TABLE: {
const wasm_tabletype_t* tabletype =
wasm_externtype_as_tabletype_const(type);
printf("table ");
print_limits(wasm_tabletype_limits(tabletype));
printf(" ");
print_valtype(wasm_tabletype_element(tabletype));
} break;
case WASM_EXTERN_MEMORY: {
const wasm_memorytype_t* memorytype =
wasm_externtype_as_memorytype_const(type);
printf("memory ");
print_limits(wasm_memorytype_limits(memorytype));
} break;
}
}
void print_name(const wasm_name_t* name) {
printf("\"%.*s\"", (int)name->size, name->data);
}
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("reflect.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);
// Instantiate.
printf("Instantiating module...\n");
wasm_extern_vec_t imports = WASM_EMPTY_VEC;
own wasm_instance_t* instance =
wasm_instance_new(store, module, &imports, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return 1;
}
// Extract export.
printf("Extracting export...\n");
own wasm_exporttype_vec_t export_types;
own wasm_extern_vec_t exports;
wasm_module_exports(module, &export_types);
wasm_instance_exports(instance, &exports);
assert(exports.size == export_types.size);
for (size_t i = 0; i < exports.size; ++i) {
assert(wasm_extern_kind(exports.data[i]) ==
wasm_externtype_kind(wasm_exporttype_type(export_types.data[i])));
printf("> export %zu ", i);
print_name(wasm_exporttype_name(export_types.data[i]));
printf("\n");
printf(">> initial: ");
print_externtype(wasm_exporttype_type(export_types.data[i]));
printf("\n");
printf(">> current: ");
own wasm_externtype_t* current = wasm_extern_type(exports.data[i]);
print_externtype(current);
wasm_externtype_delete(current);
printf("\n");
if (wasm_extern_kind(exports.data[i]) == WASM_EXTERN_FUNC) {
wasm_func_t* func = wasm_extern_as_func(exports.data[i]);
printf(">> in-arity: %zu", wasm_func_param_arity(func));
printf(", out-arity: %zu\n", wasm_func_result_arity(func));
}
}
wasm_module_delete(module);
wasm_instance_delete(instance);
wasm_extern_vec_delete(&exports);
wasm_exporttype_vec_delete(&export_types);
// 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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