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dso.rs
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dso.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::{
cell::RefCell,
collections::HashMap,
ffi::CStr,
os::raw::{c_char, c_int, c_void},
pin::Pin,
};
use tvm_sys::{ffi::BackendPackedCFunc, packed_func::PackedFunc};
use crate::{
threading::{TVMBackendParallelBarrier, TVMBackendParallelLaunch},
workspace::{TVMBackendAllocWorkspace, TVMBackendFreeWorkspace},
TVMAPISetLastError,
};
use super::Module;
const TVM_MAIN: &[u8] = b"__tvm_main__";
const TVM_MODULE_CTX: &[u8] = b"__tvm_module_ctx";
/// A module backed by a Dynamic Shared Object (dylib).
pub struct DsoModule<'a> {
lib: libloading::Library,
packed_funcs: RefCell<HashMap<String, &'a (dyn PackedFunc)>>,
_pin: std::marker::PhantomPinned,
}
macro_rules! init_context_func {
($lib:ident, $( ($fn:ident, $sig:ty) ),+ $(,)?) => {
unsafe {
$(
let fn_ptr = $lib.get::<*mut $sig>(concat!("__", stringify!($fn)).as_bytes());
if let Ok(fn_ptr) = fn_ptr {
**fn_ptr = $fn;
}
)+
}
};
}
impl<'a> DsoModule<'a> {
pub fn new<P: AsRef<std::ffi::OsStr>>(filename: P) -> Result<Pin<Box<Self>>, std::io::Error> {
let lib = libloading::Library::new(filename)?;
init_context_func!(
lib,
(TVMAPISetLastError, unsafe extern "C" fn(*const i8)),
(
TVMBackendAllocWorkspace,
unsafe extern "C" fn(c_int, c_int, u64, c_int, c_int) -> *mut c_void
),
(
TVMBackendFreeWorkspace,
unsafe extern "C" fn(c_int, c_int, *mut c_void) -> c_int
),
(
TVMBackendParallelLaunch,
unsafe extern "C" fn(
crate::threading::FTVMParallelLambda,
*const c_void,
usize,
) -> c_int
),
(
TVMBackendParallelBarrier,
unsafe extern "C" fn(usize, *const tvm_sys::ffi::TVMParallelGroupEnv)
),
);
// Pin the module in memory so that `ctx` pointer (below) is stable.
let dso_mod = Box::pin(Self {
lib,
packed_funcs: RefCell::new(HashMap::new()),
_pin: std::marker::PhantomPinned,
});
unsafe {
if let Ok(ctx) = dso_mod.lib.get::<*mut *const c_void>(TVM_MODULE_CTX) {
**ctx = &dso_mod as *const _ as *const c_void;
}
}
Ok(dso_mod)
}
}
impl<'a> Module for DsoModule<'a> {
fn get_function<S: AsRef<str>>(&self, name: S) -> Option<&(dyn PackedFunc)> {
let name = name.as_ref();
let func = match unsafe {
self.lib
.get::<BackendPackedCFunc>(if name.as_bytes() == TVM_MAIN {
// If __tvm_main__ is present, it contains the name of the
// actual main function.
match self
.lib
.get::<*const c_char>(TVM_MAIN)
.map(|p| CStr::from_ptr(*p))
{
Ok(m) => m.to_bytes(),
_ => return None,
}
} else {
name.as_bytes()
})
} {
Ok(func) => unsafe { func.into_raw() },
Err(_) => return None,
};
self.packed_funcs.borrow_mut().insert(
name.to_string(),
&*Box::leak(super::wrap_backend_packed_func(name.to_string(), *func)),
);
self.packed_funcs.borrow().get(name).copied()
}
}
impl<'a> Drop for DsoModule<'a> {
fn drop(&mut self) {
self.packed_funcs
.replace(HashMap::new())
.into_iter()
.map(|(_name, f)| unsafe { Box::from_raw(f as *const _ as *mut (dyn PackedFunc)) })
.for_each(std::mem::drop);
}
}