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syslib.rs
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syslib.rs
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
use std::{
collections::HashMap, convert::AsRef, ffi::CStr, os::raw::c_char, string::String, sync::RwLock,
};
use lazy_static::lazy_static;
use tvm_sys::{ffi::BackendPackedCFunc, packed_func::PackedFunc};
use super::Module;
pub struct SystemLibModule;
#[cfg(target_env = "sgx")]
extern "C" {
fn __tvm_module_startup();
}
lazy_static! {
static ref SYSTEM_LIB_FUNCTIONS: RwLock<HashMap<String, &'static (dyn PackedFunc)>> =
RwLock::new(HashMap::new());
}
impl Module for SystemLibModule {
fn get_function<S: AsRef<str>>(&self, name: S) -> Option<&(dyn PackedFunc)> {
SYSTEM_LIB_FUNCTIONS
.read()
.unwrap()
.get(name.as_ref())
.copied()
}
}
impl Default for SystemLibModule {
fn default() -> Self {
#[cfg(target_env = "sgx")]
unsafe {
__tvm_module_startup();
}
SystemLibModule {}
}
}
#[no_mangle]
pub extern "C" fn TVMBackendRegisterSystemLibSymbol(
cname: *const c_char,
func: BackendPackedCFunc,
) -> i32 {
let name = unsafe { CStr::from_ptr(cname).to_str().unwrap() };
SYSTEM_LIB_FUNCTIONS.write().unwrap().insert(
name.to_string(),
&*Box::leak(super::wrap_backend_packed_func(name.to_string(), func)),
);
0
}