3d34a91f0b
Implement the first version of Python language binding Co-authored-by: liang.he <liang.he@intel.com>
94 lines
2.5 KiB
Python
94 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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#!/usr/bin/env python3
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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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import ctypes
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import wamr.ffi as ffi
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WAMS_BINARY_CONTENT = (
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b"\x00asm\x01\x00\x00\x00\x01\x84\x80\x80\x80\x00\x01`\x00\x00\x02\x8a\x80"
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b"\x80\x80\x00\x01\x00\x05hello\x00\x00\x03\x82\x80\x80\x80\x00\x01\x00"
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b"\x07\x87\x80\x80\x80\x00\x01\x03run\x00\x01\n\x8a\x80\x80\x80\x00\x01"
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b"\x84\x80\x80\x80\x00\x00\x10\x00\x0b"
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)
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@ffi.wasm_func_cb_decl
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def hello_callback(args, results):
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print("Calling back...")
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print("> Hello World!")
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def main():
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print("Initializing...")
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engine = ffi.wasm_engine_new()
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store = ffi.wasm_store_new(engine)
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print("Loading binary...")
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# for convenience, use binary content instead of open file
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# with open("./hello.wasm", "rb") as f:
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# wasm = f.read()
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wasm = WAMS_BINARY_CONTENT
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binary = ffi.wasm_byte_vec_t()
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ffi.wasm_byte_vec_new_uninitialized(binary, len(wasm))
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# underlying buffer is not writable
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binary.data = (ctypes.c_ubyte * len(wasm)).from_buffer_copy(wasm)
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print("Compiling module...")
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module = ffi.wasm_module_new(store, binary)
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if not module:
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raise RuntimeError("Compiling module failed")
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binary.data = None
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ffi.wasm_byte_vec_delete(binary)
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print("Creating callback...")
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hello_type = ffi.wasm_functype_new_0_0()
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hello_func = ffi.wasm_func_new(
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store,
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hello_type,
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hello_callback,
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)
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ffi.wasm_functype_delete(hello_type)
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print("Instantiating module...")
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imports = ffi.wasm_extern_vec_t()
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ffi.wasm_extern_vec_new((imports), 1, ffi.wasm_func_as_extern(hello_func))
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instance = ffi.wasm_instance_new(store, module, imports, None)
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ffi.wasm_func_delete(hello_func)
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print("Extracting export...")
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exports = ffi.wasm_extern_vec_t()
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ffi.wasm_instance_exports(instance, exports)
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run_func = ffi.wasm_extern_as_func(exports.data[0])
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if not run_func:
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raise RuntimeError("can not extract exported function")
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ffi.wasm_instance_delete(instance)
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ffi.wasm_module_delete(module)
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print("Calling export...")
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args = ffi.wasm_val_vec_t()
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results = ffi.wasm_val_vec_t()
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ffi.wasm_val_vec_new_empty(args)
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ffi.wasm_val_vec_new_empty(results)
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ffi.wasm_func_call(run_func, args, results)
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print("Shutting down...")
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ffi.wasm_store_delete(store)
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ffi.wasm_engine_delete(engine)
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print("Done.")
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if __name__ == "__main__":
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main()
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