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Implement RFC 11: Redesigning Wasmtime's APIs (#2897)

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Implement Wasmtime's new API as designed by RFC 11. This is quite a large commit which has had lots of discussion externally, so for more information it's best to read the RFC thread and the PR thread.
This commit is contained in:
Alex Crichton
2021-06-03 09:10:53 -05:00
committed by GitHub
parent a5a28b1c5b
commit 7a1b7cdf92
233 changed files with 13349 additions and 11997 deletions
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46
examples/gcd.c
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@@ -30,8 +30,9 @@ int main() {
// Set up our context
wasm_engine_t *engine = wasm_engine_new();
assert(engine != NULL);
wasm_store_t *store = wasm_store_new(engine);
wasmtime_store_t *store = wasmtime_store_new(engine, NULL, NULL);
assert(store != NULL);
wasmtime_context_t *context = wasmtime_store_context(store);
// Load our input file to parse it next
FILE* file = fopen("examples/gcd.wat", "r");
@@ -52,52 +53,51 @@ int main() {
// Parse the wat into the binary wasm format
wasm_byte_vec_t wasm;
wasmtime_error_t *error = wasmtime_wat2wasm(&wat, &wasm);
wasmtime_error_t *error = wasmtime_wat2wasm(wat.data, wat.size, &wasm);
if (error != NULL)
exit_with_error("failed to parse wat", error, NULL);
wasm_byte_vec_delete(&wat);
// Compile and instantiate our module
wasm_module_t *module = NULL;
error = wasmtime_module_new(engine, &wasm, &module);
wasmtime_module_t *module = NULL;
error = wasmtime_module_new(engine, (uint8_t*) wasm.data, wasm.size, &module);
if (module == NULL)
exit_with_error("failed to compile module", error, NULL);
wasm_byte_vec_delete(&wasm);
wasm_trap_t *trap = NULL;
wasm_instance_t *instance = NULL;
wasm_extern_vec_t imports = WASM_EMPTY_VEC;
error = wasmtime_instance_new(store, module, &imports, &instance, &trap);
if (instance == NULL)
wasmtime_instance_t instance;
error = wasmtime_instance_new(context, module, NULL, 0, &instance, &trap);
if (error != NULL || trap != NULL)
exit_with_error("failed to instantiate", error, trap);
// Lookup our `gcd` export function
wasm_extern_vec_t externs;
wasm_instance_exports(instance, &externs);
assert(externs.size == 1);
wasm_func_t *gcd = wasm_extern_as_func(externs.data[0]);
assert(gcd != NULL);
wasmtime_extern_t gcd;
bool ok = wasmtime_instance_export_get(context, &instance, "gcd", 3, &gcd);
assert(ok);
assert(gcd.kind == WASMTIME_EXTERN_FUNC);
// And call it!
int a = 6;
int b = 27;
wasm_val_t params[2] = { WASM_I32_VAL(a), WASM_I32_VAL(b) };
wasm_val_t results[1];
wasm_val_vec_t params_vec = WASM_ARRAY_VEC(params);
wasm_val_vec_t results_vec = WASM_ARRAY_VEC(results);
error = wasmtime_func_call(gcd, &params_vec, &results_vec, &trap);
wasmtime_val_t params[2];
params[0].kind = WASMTIME_I32;
params[0].of.i32 = a;
params[1].kind = WASMTIME_I32;
params[1].of.i32 = b;
wasmtime_val_t results[1];
error = wasmtime_func_call(context, &gcd.of.func, params, 2, results, 1, &trap);
if (error != NULL || trap != NULL)
exit_with_error("failed to call gcd", error, trap);
assert(results[0].kind == WASM_I32);
assert(results[0].kind == WASMTIME_I32);
printf("gcd(%d, %d) = %d\n", a, b, results[0].of.i32);
// Clean up after ourselves at this point
ret = 0;
wasm_extern_vec_delete(&externs);
wasm_instance_delete(instance);
wasm_module_delete(module);
wasm_store_delete(store);
wasmtime_module_delete(module);
wasmtime_store_delete(store);
wasm_engine_delete(engine);
return ret;
}