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960b613d10
Real world native libs likely need to access the wasm_runtime_xxx API. This example demonstrates it. Build vmlib as a shared lib to make it straightforward to share a single runtime instance between iwasm and native libs.
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
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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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/*
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* This example basically does the same thing as test_hello.c,
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* using wasm_export.h API.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "wasm_export.h"
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static int
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test_hello2_wrapper(wasm_exec_env_t exec_env, uint32_t nameaddr,
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uint32_t resultaddr, uint32_t resultlen)
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{
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/*
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* Perform wasm_runtime_malloc to check if the runtime has been
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* initialized as expected.
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* This would fail with "memory hasn't been initialize" error
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* unless we are not sharing a runtime with the loader app. (iwasm)
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*/
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void *p = wasm_runtime_malloc(1);
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if (p == NULL) {
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return -1;
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}
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wasm_runtime_free(p);
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wasm_module_inst_t inst = wasm_runtime_get_module_inst(exec_env);
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if (!wasm_runtime_validate_app_str_addr(inst, nameaddr)
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|| !wasm_runtime_validate_app_addr(inst, resultaddr, resultlen)) {
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return -1;
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}
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const char *name = wasm_runtime_addr_app_to_native(inst, nameaddr);
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char *result = wasm_runtime_addr_app_to_native(inst, resultaddr);
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return snprintf(result, resultlen,
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"Hello, %s. This is %s! Your wasm_module_inst_t is %p.\n",
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name, __func__, inst);
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}
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/* clang-format off */
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#define REG_NATIVE_FUNC(func_name, signature) \
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{ #func_name, func_name##_wrapper, signature, NULL }
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static NativeSymbol native_symbols[] = {
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REG_NATIVE_FUNC(test_hello2, "(iii)i")
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};
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/* clang-format on */
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uint32_t
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get_native_lib(char **p_module_name, NativeSymbol **p_native_symbols)
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{
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*p_module_name = "env";
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*p_native_symbols = native_symbols;
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return sizeof(native_symbols) / sizeof(NativeSymbol);
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}
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