Improve wasm-c-api instantiation-time linking (#1902)
Add APIs to help prepare the imports for the wasm-c-api `wasm_instance_new`: - wasm_importtype_is_linked - wasm_runtime_is_import_func_linked - wasm_runtime_is_import_global_linked - wasm_extern_new_empty For wasm-c-api, developer may use `wasm_module_imports` to get the import types info, check whether an import func/global is linked with the above API, and ignore the linking of an import func/global with `wasm_extern_new_empty`. Sample `wasm-c-api-import` is added and document is updated.
This commit is contained in:
liang.he
204
samples/wasm-c-api-imports/host/example1.c
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204
samples/wasm-c-api-imports/host/example1.c
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@ -0,0 +1,204 @@
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/*
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* Copyright (C) 2019 Intel Corporation. All rights reserved.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "wasm_c_api.h"
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#include "wasm_export.h"
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static wasm_trap_t *
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host_logs(const wasm_val_vec_t *args, wasm_val_vec_t *results)
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{
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return NULL;
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}
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static bool
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build_imports(wasm_store_t *store, const wasm_module_t *module,
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wasm_extern_vec_t *out)
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{
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wasm_importtype_vec_t importtypes = { 0 };
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wasm_module_imports(module, &importtypes);
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wasm_extern_t *externs[32] = { 0 };
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for (unsigned i = 0; i < importtypes.num_elems; i++) {
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wasm_importtype_t *importtype = importtypes.data[i];
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/* use wasm_extern_new_empty() to create a placeholder */
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if (wasm_importtype_is_linked(importtype)) {
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externs[i] = wasm_extern_new_empty(
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store, wasm_externtype_kind(wasm_importtype_type(importtype)));
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continue;
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}
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const wasm_name_t *module_name =
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wasm_importtype_module(importtypes.data[i]);
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const wasm_name_t *field_name =
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wasm_importtype_name(importtypes.data[i]);
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if (strncmp(module_name->data, "env", strlen("env")) == 0
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&& strncmp(field_name->data, "log", strlen("log")) == 0) {
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wasm_functype_t *log_type = wasm_functype_new_2_0(
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wasm_valtype_new_i64(), wasm_valtype_new_i32());
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wasm_func_t *log_func = wasm_func_new(store, log_type, host_logs);
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wasm_functype_delete(log_type);
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externs[i] = wasm_func_as_extern(log_func);
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}
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}
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wasm_extern_vec_new(out, importtypes.num_elems, externs);
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wasm_importtype_vec_delete(&importtypes);
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return true;
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}
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int
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main()
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{
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int main_ret = EXIT_FAILURE;
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// Initialize.
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printf("Initializing...\n");
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wasm_engine_t *engine = wasm_engine_new();
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if (!engine)
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goto quit;
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wasm_store_t *store = wasm_store_new(engine);
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if (!store)
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goto delete_engine;
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// Load binary.
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printf("Loading binary...\n");
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#if WASM_ENABLE_AOT != 0 && WASM_ENABLE_INTERP == 0
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FILE *file = fopen("send_recv.aot", "rb");
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printf("> Load .aot\n");
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#else
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FILE *file = fopen("send_recv.wasm", "rb");
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printf("> Load .wasm\n");
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#endif
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if (!file) {
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printf("> Error loading module!\n");
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goto delete_store;
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}
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int ret = fseek(file, 0L, SEEK_END);
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if (ret == -1) {
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printf("> Error loading module!\n");
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goto close_file;
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}
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long file_size = ftell(file);
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if (file_size == -1) {
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printf("> Error loading module!\n");
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goto close_file;
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}
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ret = fseek(file, 0L, SEEK_SET);
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if (ret == -1) {
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printf("> Error loading module!\n");
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goto close_file;
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}
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wasm_byte_vec_t binary;
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wasm_byte_vec_new_uninitialized(&binary, file_size);
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if (fread(binary.data, file_size, 1, file) != 1) {
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printf("> Error loading module!\n");
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goto delete_binary;
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}
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// Compile.
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printf("Compiling module...\n");
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wasm_module_t *module = wasm_module_new(store, &binary);
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if (!module) {
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printf("> Error compiling module!\n");
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goto delete_binary;
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}
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// Set Wasi Context
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const char *addr_pool[1] = { "127.0.0.1" };
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wasm_runtime_set_wasi_addr_pool(*module, addr_pool, 1);
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// Instantiate.
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printf("Instantiating module...\n");
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wasm_extern_vec_t imports = { 0 };
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ret = build_imports(store, module, &imports);
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if (!ret) {
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printf("> Error building imports!\n");
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goto delete_module;
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}
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wasm_instance_t *instance =
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wasm_instance_new(store, module, &imports, NULL);
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if (!instance) {
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printf("> Error instantiating module!\n");
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goto delete_imports;
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}
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// Extract export.
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printf("Extracting export...\n");
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wasm_extern_vec_t exports;
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wasm_instance_exports(instance, &exports);
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if (exports.size == 0) {
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printf("> Error accessing exports!\n");
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goto delete_instance;
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}
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/**
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* should use information from wasm_module_exports to avoid hard coding "1"
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*/
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const wasm_func_t *start_func = wasm_extern_as_func(exports.data[1]);
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if (start_func == NULL) {
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printf("> Error accessing export!\n");
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goto delete_exports;
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}
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// Call. "_start(nil) -> i32"
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printf("Calling _start ...\n");
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wasm_val_t rs[1] = { WASM_I32_VAL(0) };
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wasm_val_vec_t args = WASM_EMPTY_VEC;
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wasm_val_vec_t results = WASM_ARRAY_VEC(rs);
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wasm_trap_t *trap = wasm_func_call(start_func, &args, &results);
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if (trap) {
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wasm_name_t message = { 0 };
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wasm_trap_message(trap, &message);
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printf("> Error calling function! %s\n", message.data);
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wasm_name_delete(&message);
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wasm_trap_delete(trap);
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goto delete_exports;
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}
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// Print result.
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printf("Printing result...\n");
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printf("> %u\n", rs[0].of.i32);
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// Shut down.
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printf("Shutting down...\n");
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// All done.
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printf("Done.\n");
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main_ret = EXIT_SUCCESS;
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delete_exports:
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wasm_extern_vec_delete(&exports);
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delete_instance:
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wasm_instance_delete(instance);
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delete_imports:
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wasm_extern_vec_delete(&imports);
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delete_module:
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wasm_module_delete(module);
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delete_binary:
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wasm_byte_vec_delete(&binary);
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close_file:
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fclose(file);
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delete_store:
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wasm_store_delete(store);
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delete_engine:
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wasm_engine_delete(engine);
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quit:
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return main_ret;
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}
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