1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
//! Handles dynamic library loading for proc macro
use crate::{proc_macro::bridge, rustc_server::TokenStream};
use std::path::Path;
use goblin::{mach::Mach, Object};
use libloading::Library;
use ra_proc_macro::ProcMacroKind;
use std::io::Error as IoError;
use std::io::ErrorKind as IoErrorKind;
const NEW_REGISTRAR_SYMBOL: &str = "_rustc_proc_macro_decls_";
fn invalid_data_err(e: impl Into<Box<dyn std::error::Error + Send + Sync>>) -> IoError {
IoError::new(IoErrorKind::InvalidData, e)
}
fn is_derive_registrar_symbol(symbol: &str) -> bool {
symbol.contains(NEW_REGISTRAR_SYMBOL)
}
fn find_registrar_symbol(file: &Path) -> Result<Option<String>, IoError> {
let buffer = std::fs::read(file)?;
let object = Object::parse(&buffer).map_err(invalid_data_err)?;
match object {
Object::Elf(elf) => {
let symbols = elf.dynstrtab.to_vec().map_err(invalid_data_err)?;
let name =
symbols.iter().find(|s| is_derive_registrar_symbol(s)).map(|s| s.to_string());
Ok(name)
}
Object::PE(pe) => {
let name = pe
.exports
.iter()
.flat_map(|s| s.name)
.find(|s| is_derive_registrar_symbol(s))
.map(|s| s.to_string());
Ok(name)
}
Object::Mach(Mach::Binary(binary)) => {
let exports = binary.exports().map_err(invalid_data_err)?;
let name = exports
.iter()
.map(|s| {
// In macos doc:
// https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/dlsym.3.html
// Unlike other dyld API's, the symbol name passed to dlsym() must NOT be
// prepended with an underscore.
if s.name.starts_with("_") {
&s.name[1..]
} else {
&s.name
}
})
.find(|s| is_derive_registrar_symbol(&s))
.map(|s| s.to_string());
Ok(name)
}
_ => Ok(None),
}
}
/// Loads dynamic library in platform dependent manner.
///
/// For unix, you have to use RTLD_DEEPBIND flag to escape problems described
/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample)
/// and [here](https://github.com/rust-lang/rust/issues/60593).
///
/// Usage of RTLD_DEEPBIND
/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample/issues/1)
///
/// It seems that on Windows that behaviour is default, so we do nothing in that case.
#[cfg(windows)]
fn load_library(file: &Path) -> Result<Library, libloading::Error> {
Library::new(file)
}
#[cfg(unix)]
fn load_library(file: &Path) -> Result<Library, libloading::Error> {
use libloading::os::unix::Library as UnixLibrary;
use std::os::raw::c_int;
const RTLD_NOW: c_int = 0x00002;
const RTLD_DEEPBIND: c_int = 0x00008;
UnixLibrary::open(Some(file), RTLD_NOW | RTLD_DEEPBIND).map(|lib| lib.into())
}
struct ProcMacroLibraryLibloading {
// Hold the dylib to prevent it for unloadeding
_lib: Library,
exported_macros: Vec<bridge::client::ProcMacro>,
}
impl ProcMacroLibraryLibloading {
fn open(file: &Path) -> Result<Self, IoError> {
let symbol_name = find_registrar_symbol(file)?
.ok_or(invalid_data_err(format!("Cannot find registrar symbol in file {:?}", file)))?;
let lib = load_library(file).map_err(invalid_data_err)?;
let exported_macros = {
let macros: libloading::Symbol<&&[bridge::client::ProcMacro]> =
unsafe { lib.get(symbol_name.as_bytes()) }.map_err(invalid_data_err)?;
macros.to_vec()
};
Ok(ProcMacroLibraryLibloading { _lib: lib, exported_macros })
}
}
type ProcMacroLibraryImpl = ProcMacroLibraryLibloading;
pub struct Expander {
libs: Vec<ProcMacroLibraryImpl>,
}
impl Expander {
pub fn new<P: AsRef<Path>>(lib: &P) -> Result<Expander, String> {
let mut libs = vec![];
/* Some libraries for dynamic loading require canonicalized path (even when it is
already absolute
*/
let lib =
lib.as_ref().canonicalize().expect(&format!("Cannot canonicalize {:?}", lib.as_ref()));
let library = ProcMacroLibraryImpl::open(&lib).map_err(|e| e.to_string())?;
libs.push(library);
Ok(Expander { libs })
}
pub fn expand(
&self,
macro_name: &str,
macro_body: &ra_tt::Subtree,
attributes: Option<&ra_tt::Subtree>,
) -> Result<ra_tt::Subtree, bridge::PanicMessage> {
let parsed_body = TokenStream::with_subtree(macro_body.clone());
let parsed_attributes = attributes
.map_or(crate::rustc_server::TokenStream::new(), |attr| {
TokenStream::with_subtree(attr.clone())
});
for lib in &self.libs {
for proc_macro in &lib.exported_macros {
match proc_macro {
bridge::client::ProcMacro::CustomDerive { trait_name, client, .. }
if *trait_name == macro_name =>
{
let res = client.run(
&crate::proc_macro::bridge::server::SameThread,
crate::rustc_server::Rustc::default(),
parsed_body,
);
return res.map(|it| it.subtree);
}
bridge::client::ProcMacro::Bang { name, client } if *name == macro_name => {
let res = client.run(
&crate::proc_macro::bridge::server::SameThread,
crate::rustc_server::Rustc::default(),
parsed_body,
);
return res.map(|it| it.subtree);
}
bridge::client::ProcMacro::Attr { name, client } if *name == macro_name => {
let res = client.run(
&crate::proc_macro::bridge::server::SameThread,
crate::rustc_server::Rustc::default(),
parsed_attributes,
parsed_body,
);
return res.map(|it| it.subtree);
}
_ => continue,
}
}
}
Err(bridge::PanicMessage::String("Nothing to expand".to_string()))
}
pub fn list_macros(&self) -> Result<Vec<(String, ProcMacroKind)>, bridge::PanicMessage> {
let mut result = vec![];
for lib in &self.libs {
for proc_macro in &lib.exported_macros {
let res = match proc_macro {
bridge::client::ProcMacro::CustomDerive { trait_name, .. } => {
(trait_name.to_string(), ProcMacroKind::CustomDerive)
}
bridge::client::ProcMacro::Bang { name, .. } => {
(name.to_string(), ProcMacroKind::FuncLike)
}
bridge::client::ProcMacro::Attr { name, .. } => {
(name.to_string(), ProcMacroKind::Attr)
}
};
result.push(res);
}
}
Ok(result)
}
}
|
