#[cfg(feature = "runtime")]
macro_rules! link {
(
@LOAD:
$(#[doc=$doc:expr])*
#[cfg($cfg:meta)]
fn $name:ident($($pname:ident: $pty:ty), *) $(-> $ret:ty)*
) => (
$(#[doc=$doc])*
#[cfg($cfg)]
pub fn $name(library: &mut super::SharedLibrary) {
let symbol = unsafe { library.library.get(stringify!($name).as_bytes()) }.ok();
library.functions.$name = match symbol {
Some(s) => *s,
None => None,
};
}
#[cfg(not($cfg))]
pub fn $name(_: &mut super::SharedLibrary) {}
);
(
@LOAD:
fn $name:ident($($pname:ident: $pty:ty), *) $(-> $ret:ty)*
) => (
link!(@LOAD: #[cfg(feature = "runtime")] fn $name($($pname: $pty), *) $(-> $ret)*);
);
(
$(
$(#[doc=$doc:expr] #[cfg($cfg:meta)])*
pub fn $name:ident($($pname:ident: $pty:ty), *) $(-> $ret:ty)*;
)+
) => (
use std::cell::{RefCell};
use std::sync::{Arc};
use std::path::{Path, PathBuf};
/// The (minimum) version of a `libclang` shared library.
#[allow(missing_docs)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Version {
V3_5 = 35,
V3_6 = 36,
V3_7 = 37,
V3_8 = 38,
V3_9 = 39,
V4_0 = 40,
V5_0 = 50,
V6_0 = 60,
V7_0 = 70,
V8_0 = 80,
V9_0 = 90,
}
#[derive(Debug, Default)]
pub struct Functions {
$(
$(#[doc=$doc] #[cfg($cfg)])*
pub $name: Option<unsafe extern fn($($pname: $pty), *) $(-> $ret)*>,
)+
}
#[derive(Debug)]
pub struct SharedLibrary {
library: libloading::Library,
path: PathBuf,
pub functions: Functions,
}
impl SharedLibrary {
fn new(library: libloading::Library, path: PathBuf) -> Self {
Self { library, path, functions: Functions::default() }
}
pub fn path(&self) -> &Path {
&self.path
}
pub fn version(&self) -> Option<Version> {
macro_rules! check {
($fn:expr, $version:ident) => {
if self.library.get::<unsafe extern fn()>($fn).is_ok() {
return Some(Version::$version);
}
};
}
unsafe {
check!(b"clang_Cursor_isAnonymousRecordDecl", V9_0);
check!(b"clang_Cursor_getObjCPropertyGetterName", V8_0);
check!(b"clang_File_tryGetRealPathName", V7_0);
check!(b"clang_CXIndex_setInvocationEmissionPathOption", V6_0);
check!(b"clang_Cursor_isExternalSymbol", V5_0);
check!(b"clang_EvalResult_getAsLongLong", V4_0);
check!(b"clang_CXXConstructor_isConvertingConstructor", V3_9);
check!(b"clang_CXXField_isMutable", V3_8);
check!(b"clang_Cursor_getOffsetOfField", V3_7);
check!(b"clang_Cursor_getStorageClass", V3_6);
check!(b"clang_Type_getNumTemplateArguments", V3_5);
}
None
}
}
thread_local!(static LIBRARY: RefCell<Option<Arc<SharedLibrary>>> = RefCell::new(None));
pub fn is_loaded() -> bool {
LIBRARY.with(|l| l.borrow().is_some())
}
fn with_library<T, F>(f: F) -> Option<T> where F: FnOnce(&SharedLibrary) -> T {
LIBRARY.with(|l| {
match l.borrow().as_ref() {
Some(library) => Some(f(&library)),
_ => None,
}
})
}
$(
#[cfg_attr(feature="cargo-clippy", allow(clippy::missing_safety_doc))]
#[cfg_attr(feature="cargo-clippy", allow(clippy::too_many_arguments))]
$(#[doc=$doc] #[cfg($cfg)])*
pub unsafe fn $name($($pname: $pty), *) $(-> $ret)* {
let f = with_library(|l| {
l.functions.$name.expect(concat!(
"`libclang` function not loaded: `",
stringify!($name),
"`. This crate requires that `libclang` 3.9 or later be installed on your ",
"system. For more information on how to accomplish this, see here: ",
"https://rust-lang.github.io/rust-bindgen/requirements.html#installing-clang-39"))
}).expect("a `libclang` shared library is not loaded on this thread");
f($($pname), *)
}
$(#[doc=$doc] #[cfg($cfg)])*
pub mod $name {
pub fn is_loaded() -> bool {
super::with_library(|l| l.functions.$name.is_some()).unwrap_or(false)
}
}
)+
mod load {
$(link!(@LOAD: $(#[cfg($cfg)])* fn $name($($pname: $pty), *) $(-> $ret)*);)+
}
pub fn load_manually() -> Result<SharedLibrary, String> {
#[allow(dead_code)]
mod build {
include!(concat!(env!("OUT_DIR"), "/macros.rs"));
pub mod common { include!(concat!(env!("OUT_DIR"), "/common.rs")); }
pub mod dynamic { include!(concat!(env!("OUT_DIR"), "/dynamic.rs")); }
}
let (directory, filename) = build::dynamic::find(true)?;
let path = directory.join(filename);
unsafe {
let library = libloading::Library::new(&path).map_err(|e| {
format!(
"the `libclang` shared library at {} could not be opened: {}",
path.display(),
e,
)
});
let mut library = SharedLibrary::new(library?, path);
$(load::$name(&mut library);)+
Ok(library)
}
}
#[allow(dead_code)]
pub fn load() -> Result<(), String> {
let library = Arc::new(load_manually()?);
LIBRARY.with(|l| *l.borrow_mut() = Some(library));
Ok(())
}
pub fn unload() -> Result<(), String> {
let library = set_library(None);
if library.is_some() {
Ok(())
} else {
Err("a `libclang` shared library is not in use in the current thread".into())
}
}
pub fn get_library() -> Option<Arc<SharedLibrary>> {
LIBRARY.with(|l| l.borrow_mut().clone())
}
pub fn set_library(library: Option<Arc<SharedLibrary>>) -> Option<Arc<SharedLibrary>> {
LIBRARY.with(|l| mem::replace(&mut *l.borrow_mut(), library))
}
)
}
#[cfg(not(feature = "runtime"))]
macro_rules! link {
(
$(
$(#[doc=$doc:expr] #[cfg($cfg:meta)])*
pub fn $name:ident($($pname:ident: $pty:ty), *) $(-> $ret:ty)*;
)+
) => (
extern {
$(
$(#[doc=$doc] #[cfg($cfg)])*
pub fn $name($($pname: $pty), *) $(-> $ret)*;
)+
}
$(
$(#[doc=$doc] #[cfg($cfg)])*
pub mod $name {
pub fn is_loaded() -> bool { true }
}
)+
)
}