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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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43
examples/wasi/main.c
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@@ -28,12 +28,18 @@ to tweak the `-lpthread` and such annotations.
static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap);
int main() {
int ret = 0;
// 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);
// Create a linker with WASI functions defined
wasmtime_linker_t *linker = wasmtime_linker_new(engine);
wasmtime_error_t *error = wasmtime_linker_define_wasi(linker);
if (error != NULL)
exit_with_error("failed to link wasi", error, NULL);
wasm_byte_vec_t wasm;
// Load our input file to parse it next
@@ -53,8 +59,8 @@ int main() {
fclose(file);
// Compile our modules
wasm_module_t *module = NULL;
wasmtime_error_t *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)
exit_with_error("failed to compile module", error, NULL);
wasm_byte_vec_delete(&wasm);
@@ -68,39 +74,28 @@ int main() {
wasi_config_inherit_stdout(wasi_config);
wasi_config_inherit_stderr(wasi_config);
wasm_trap_t *trap = NULL;
wasi_instance_t *wasi = wasi_instance_new(store, "wasi_snapshot_preview1", wasi_config, &trap);
if (wasi == NULL)
exit_with_error("failed to instantiate WASI", NULL, trap);
wasmtime_linker_t *linker = wasmtime_linker_new(store);
error = wasmtime_linker_define_wasi(linker, wasi);
error = wasmtime_context_set_wasi(context, wasi_config);
if (error != NULL)
exit_with_error("failed to link wasi", error, NULL);
exit_with_error("failed to instantiate WASI", error, NULL);
// Instantiate the module
wasm_name_t empty;
wasm_name_new_from_string(&empty, "");
wasm_instance_t *instance = NULL;
error = wasmtime_linker_module(linker, &empty, module);
error = wasmtime_linker_module(linker, context, "", 0, module);
if (error != NULL)
exit_with_error("failed to instantiate module", error, NULL);
// Run it.
wasm_func_t* func;
wasmtime_linker_get_default(linker, &empty, &func);
wasmtime_func_t func;
error = wasmtime_linker_get_default(linker, context, "", 0, &func);
if (error != NULL)
exit_with_error("failed to locate default export for module", error, NULL);
wasm_val_vec_t args_vec = WASM_EMPTY_VEC;
wasm_val_vec_t results_vec = WASM_EMPTY_VEC;
error = wasmtime_func_call(func, &args_vec, &results_vec, &trap);
if (error != NULL)
error = wasmtime_func_call(context, &func, NULL, 0, NULL, 0, &trap);
if (error != NULL || trap != NULL)
exit_with_error("error calling default export", error, trap);
// Clean up after ourselves at this point
wasm_name_delete(&empty);
wasm_module_delete(module);
wasm_store_delete(store);
wasmtime_module_delete(module);
wasmtime_store_delete(store);
wasm_engine_delete(engine);
return 0;
}