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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
use rustc_ast as ast;
use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::TokenStream;
use rustc_ast_pretty::pprust;
use rustc_expand::base::{self, *};
use rustc_expand::module::DirOwnership;
use rustc_parse::parser::{ForceCollect, Parser};
use rustc_parse::{self, new_parser_from_file};
use rustc_session::lint::builtin::INCOMPLETE_INCLUDE;
use rustc_span::symbol::Symbol;
use rustc_span::{self, Pos, Span};
use smallvec::SmallVec;
use std::rc::Rc;
// These macros all relate to the file system; they either return
// the column/row/filename of the expression, or they include
// a given file into the current one.
/// line!(): expands to the current line number
pub fn expand_line(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "line!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_u32(topmost, loc.line as u32))
}
/* column!(): expands to the current column number */
pub fn expand_column(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "column!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32 + 1))
}
/// file!(): expands to the current filename */
/// The source_file (`loc.file`) contains a bunch more information we could spit
/// out if we wanted.
pub fn expand_file(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "file!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(
cx.expr_str(topmost, Symbol::intern(&loc.file.name.prefer_remapped().to_string_lossy())),
)
}
pub fn expand_stringify(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
let s = pprust::tts_to_string(&tts);
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&s)))
}
pub fn expand_mod(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "module_path!");
let mod_path = &cx.current_expansion.module.mod_path;
let string = mod_path.iter().map(|x| x.to_string()).collect::<Vec<String>>().join("::");
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&string)))
}
/// include! : parse the given file as an expr
/// This is generally a bad idea because it's going to behave
/// unhygienically.
pub fn expand_include<'cx>(
cx: &'cx mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'cx> {
let sp = cx.with_def_site_ctxt(sp);
let Some(file) = get_single_str_from_tts(cx, sp, tts, "include!") else {
return DummyResult::any(sp);
};
// The file will be added to the code map by the parser
let file = match resolve_path(&cx.sess.parse_sess, file.as_str(), sp) {
Ok(f) => f,
Err(mut err) => {
err.emit();
return DummyResult::any(sp);
}
};
let p = new_parser_from_file(cx.parse_sess(), &file, Some(sp));
// If in the included file we have e.g., `mod bar;`,
// then the path of `bar.rs` should be relative to the directory of `file`.
// See https://github.com/rust-lang/rust/pull/69838/files#r395217057 for a discussion.
// `MacroExpander::fully_expand_fragment` later restores, so "stack discipline" is maintained.
let dir_path = file.parent().unwrap_or(&file).to_owned();
cx.current_expansion.module = Rc::new(cx.current_expansion.module.with_dir_path(dir_path));
cx.current_expansion.dir_ownership = DirOwnership::Owned { relative: None };
struct ExpandResult<'a> {
p: Parser<'a>,
node_id: ast::NodeId,
}
impl<'a> base::MacResult for ExpandResult<'a> {
fn make_expr(mut self: Box<ExpandResult<'a>>) -> Option<P<ast::Expr>> {
let r = base::parse_expr(&mut self.p)?;
if self.p.token != token::Eof {
self.p.sess.buffer_lint(
&INCOMPLETE_INCLUDE,
self.p.token.span,
self.node_id,
"include macro expected single expression in source",
);
}
Some(r)
}
fn make_items(mut self: Box<ExpandResult<'a>>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
let mut ret = SmallVec::new();
loop {
match self.p.parse_item(ForceCollect::No) {
Err(mut err) => {
err.emit();
break;
}
Ok(Some(item)) => ret.push(item),
Ok(None) => {
if self.p.token != token::Eof {
let token = pprust::token_to_string(&self.p.token);
let msg = format!("expected item, found `{}`", token);
self.p.struct_span_err(self.p.token.span, &msg).emit();
}
break;
}
}
}
Some(ret)
}
}
Box::new(ExpandResult { p, node_id: cx.current_expansion.lint_node_id })
}
// include_str! : read the given file, insert it as a literal string expr
pub fn expand_include_str(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
let Some(file) = get_single_str_from_tts(cx, sp, tts, "include_str!") else {
return DummyResult::any(sp);
};
let file = match resolve_path(&cx.sess.parse_sess, file.as_str(), sp) {
Ok(f) => f,
Err(mut err) => {
err.emit();
return DummyResult::any(sp);
}
};
match cx.source_map().load_binary_file(&file) {
Ok(bytes) => match std::str::from_utf8(&bytes) {
Ok(src) => {
let interned_src = Symbol::intern(&src);
base::MacEager::expr(cx.expr_str(sp, interned_src))
}
Err(_) => {
cx.span_err(sp, &format!("{} wasn't a utf-8 file", file.display()));
DummyResult::any(sp)
}
},
Err(e) => {
cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
DummyResult::any(sp)
}
}
}
pub fn expand_include_bytes(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
let Some(file) = get_single_str_from_tts(cx, sp, tts, "include_bytes!") else {
return DummyResult::any(sp);
};
let file = match resolve_path(&cx.sess.parse_sess, file.as_str(), sp) {
Ok(f) => f,
Err(mut err) => {
err.emit();
return DummyResult::any(sp);
}
};
match cx.source_map().load_binary_file(&file) {
Ok(bytes) => base::MacEager::expr(cx.expr_lit(sp, ast::LitKind::ByteStr(bytes.into()))),
Err(e) => {
cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
DummyResult::any(sp)
}
}
}
|
