/rust/registry/src/index.crates.io-6f17d22bba15001f/rustc-demangle-0.1.24/src/legacy.rs

Source (jump to first uncovered line)
use core::char;
use core::fmt;

/// Representation of a demangled symbol name.
pub struct Demangle<'a> {
    inner: &'a str,
    /// The number of ::-separated elements in the original name.
    elements: usize,
}

/// De-mangles a Rust symbol into a more readable version
///
/// All Rust symbols by default are mangled as they contain characters that
/// cannot be represented in all object files. The mangling mechanism is similar
/// to C++'s, but Rust has a few specifics to handle items like lifetimes in
/// symbols.
///
/// This function will take a **mangled** symbol and return a value. When printed,
/// the de-mangled version will be written. If the symbol does not look like
/// a mangled symbol, the original value will be written instead.
///
/// # Examples
///
/// ```
/// use rustc_demangle::demangle;
///
/// assert_eq!(demangle("_ZN4testE").to_string(), "test");
/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
/// assert_eq!(demangle("foo").to_string(), "foo");
/// ```

// All Rust symbols are in theory lists of "::"-separated identifiers. Some
// assemblers, however, can't handle these characters in symbol names. To get
// around this, we use C++-style mangling. The mangling method is:
//
// 1. Prefix the symbol with "_ZN"
// 2. For each element of the path, emit the length plus the element
// 3. End the path with "E"
//
// For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".
//
// We're the ones printing our backtraces, so we can't rely on anything else to
// demangle our symbols. It's *much* nicer to look at demangled symbols, so
// this function is implemented to give us nice pretty output.
//
// Note that this demangler isn't quite as fancy as it could be. We have lots
// of other information in our symbols like hashes, version, type information,
// etc. Additionally, this doesn't handle glue symbols at all.
pub fn demangle(s: &str) -> Result<(Demangle, &str), ()> {
    // First validate the symbol. If it doesn't look like anything we're
    // expecting, we just print it literally. Note that we must handle non-Rust
    // symbols because we could have any function in the backtrace.
    let inner = if s.starts_with("_ZN") {
        &s[3..]
    } else if s.starts_with("ZN") {
        // On Windows, dbghelp strips leading underscores, so we accept "ZN...E"
        // form too.
        &s[2..]
    } else if s.starts_with("__ZN") {
        // On OSX, symbols are prefixed with an extra _
        &s[4..]
    } else {
        return Err(());
    };

    // only work with ascii text
    if inner.bytes().any(|c| c & 0x80 != 0) {
        return Err(());
    }

    let mut elements = 0;
    let mut chars = inner.chars();
    let mut c = chars.next().ok_or(())?;
    while c != 'E' {
        // Decode an identifier element's length.
        if !c.is_digit(10) {
            return Err(());
        }
        let mut len = 0usize;
        while let Some(d) = c.to_digit(10) {
            len = len
                .checked_mul(10)
                .and_then(|len| len.checked_add(d as usize))
                .ok_or(())?;
            c = chars.next().ok_or(())?;
        }

        // `c` already contains the first character of this identifier, skip it and
        // all the other characters of this identifier, to reach the next element.
        for _ in 0..len {
            c = chars.next().ok_or(())?;
        }

        elements += 1;
    }

    Ok((Demangle { inner, elements }, chars.as_str()))
}

// Rust hashes are hex digits with an `h` prepended.
fn is_rust_hash(s: &str) -> bool {
    s.starts_with('h') && s[1..].chars().all(|c| c.is_digit(16))
}

impl<'a> fmt::Display for Demangle<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        // Alright, let's do this.
        let mut inner = self.inner;
        for element in 0..self.elements {
            let mut rest = inner;
            while rest.chars().next().unwrap().is_digit(10) {
                rest = &rest[1..];
            }
            let i: usize = inner[..(inner.len() - rest.len())].parse().unwrap();
            inner = &rest[i..];
            rest = &rest[..i];
            // Skip printing the hash if alternate formatting
            // was requested.
            if f.alternate() && element + 1 == self.elements && is_rust_hash(&rest) {
                break;
            }
            if element != 0 {
                f.write_str("::")?;
            }
            if rest.starts_with("_$") {
                rest = &rest[1..];
            }
            loop {
                if rest.starts_with('.') {
                    if let Some('.') = rest[1..].chars().next() {
                        f.write_str("::")?;
                        rest = &rest[2..];
                    } else {
                        f.write_str(".")?;
                        rest = &rest[1..];
                    }
                } else if rest.starts_with('$') {
                    let (escape, after_escape) = if let Some(end) = rest[1..].find('$') {
                        (&rest[1..=end], &rest[end + 2..])
                    } else {
                        break;
                    };

                    // see src/librustc_codegen_utils/symbol_names/legacy.rs for these mappings
                    let unescaped = match escape {
                        "SP" => "@",
                        "BP" => "*",
                        "RF" => "&",
                        "LT" => "<",
                        "GT" => ">",
                        "LP" => "(",
                        "RP" => ")",
                        "C" => ",",

                        _ => {
                            if escape.starts_with('u') {
                                let digits = &escape[1..];
                                let all_lower_hex = digits.chars().all(|c| match c {
                                    '0'..='9' | 'a'..='f' => true,
                                    _ => false,
                                });
                                let c = u32::from_str_radix(digits, 16)
                                    .ok()
                                    .and_then(char::from_u32);
                                if let (true, Some(c)) = (all_lower_hex, c) {
                                    // FIXME(eddyb) do we need to filter out control codepoints?
                                    if !c.is_control() {
                                        c.fmt(f)?;
                                        rest = after_escape;
                                        continue;
                                    }
                                }
                            }
                            break;
                        }
                    };
                    f.write_str(unescaped)?;
                    rest = after_escape;
                } else if let Some(i) = rest.find(|c| c == '$' || c == '.') {
                    f.write_str(&rest[..i])?;
                    rest = &rest[i..];
                } else {
                    break;
                }
            }
            f.write_str(rest)?;
        }

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use std::prelude::v1::*;

    macro_rules! t {
        ($a:expr, $b:expr) => {
            assert!(ok($a, $b))
        };
    }

    macro_rules! t_err {
        ($a:expr) => {
            assert!(ok_err($a))
        };
    }

    macro_rules! t_nohash {
        ($a:expr, $b:expr) => {{
            assert_eq!(format!("{:#}", ::demangle($a)), $b);
        }};
    }

    fn ok(sym: &str, expected: &str) -> bool {
        match ::try_demangle(sym) {
            Ok(s) => {
                if s.to_string() == expected {
                    true
                } else {
                    println!("\n{}\n!=\n{}\n", s, expected);
                    false
                }
            }
            Err(_) => {
                println!("error demangling");
                false
            }
        }
    }

    fn ok_err(sym: &str) -> bool {
        match ::try_demangle(sym) {
            Ok(_) => {
                println!("succeeded in demangling");
                false
            }
            Err(_) => ::demangle(sym).to_string() == sym,
        }
    }

    #[test]
    fn demangle() {
        t_err!("test");
        t!("_ZN4testE", "test");
        t_err!("_ZN4test");
        t!("_ZN4test1a2bcE", "test::a::bc");
    }

    #[test]
    fn demangle_dollars() {
        t!("_ZN4$RP$E", ")");
        t!("_ZN8$RF$testE", "&test");
        t!("_ZN8$BP$test4foobE", "*test::foob");
        t!("_ZN9$u20$test4foobE", " test::foob");
        t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
    }

    #[test]
    fn demangle_many_dollars() {
        t!("_ZN13test$u20$test4foobE", "test test::foob");
        t!("_ZN12test$BP$test4foobE", "test*test::foob");
    }

    #[test]
    fn demangle_osx() {
        t!(
            "__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E",
            "alloc::allocator::Layout::for_value::h02a996811f781011"
        );
        t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
        t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
    }

    #[test]
    fn demangle_windows() {
        t!("ZN4testE", "test");
        t!("ZN13test$u20$test4foobE", "test test::foob");
        t!("ZN12test$RF$test4foobE", "test&test::foob");
    }

    #[test]
    fn demangle_elements_beginning_with_underscore() {
        t!("_ZN13_$LT$test$GT$E", "<test>");
        t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
        t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
    }

    #[test]
    fn demangle_trait_impls() {
        t!(
            "_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
            "<Test + 'static as foo::Bar<Test>>::bar"
        );
    }

    #[test]
    fn demangle_without_hash() {
        let s = "_ZN3foo17h05af221e174051e9E";
        t!(s, "foo::h05af221e174051e9");
        t_nohash!(s, "foo");
    }

    #[test]
    fn demangle_without_hash_edgecases() {
        // One element, no hash.
        t_nohash!("_ZN3fooE", "foo");
        // Two elements, no hash.
        t_nohash!("_ZN3foo3barE", "foo::bar");
        // Longer-than-normal hash.
        t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
        // Shorter-than-normal hash.
        t_nohash!("_ZN3foo5h05afE", "foo");
        // Valid hash, but not at the end.
        t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
        // Not a valid hash, missing the 'h'.
        t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
        // Not a valid hash, has a non-hex-digit.
        t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
    }

    #[test]
    fn demangle_thinlto() {
        // One element, no hash.
        t!("_ZN3fooE.llvm.9D1C9369", "foo");
        t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
        t_nohash!(
            "_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9",
            "backtrace::foo"
        );
    }

    #[test]
    fn demangle_llvm_ir_branch_labels() {
        t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
        t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
    }

    #[test]
    fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
        t_err!("_ZN3fooE.llvm moocow");
    }

    #[test]
    fn dont_panic() {
        ::demangle("_ZN2222222222222222222222EE").to_string();
        ::demangle("_ZN5*70527e27.ll34csaғE").to_string();
        ::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
        ::demangle(
            "\
             _ZN5~saäb4e\n\
             2734cOsbE\n\
             5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
             ",
        )
        .to_string();
    }

    #[test]
    fn invalid_no_chop() {
        t_err!("_ZNfooE");
    }

    #[test]
    fn handle_assoc_types() {
        t!("_ZN151_$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
    }

    #[test]
    fn handle_bang() {
        t!(
            "_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
            "<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
        );
    }

    #[test]
    fn demangle_utf8_idents() {
        t_nohash!(
            "_ZN11utf8_idents157_$u10e1$$u10d0$$u10ed$$u10db$$u10d4$$u10da$$u10d0$$u10d3$_$u10d2$$u10d4$$u10db$$u10e0$$u10d8$$u10d4$$u10da$$u10d8$_$u10e1$$u10d0$$u10d3$$u10d8$$u10da$$u10d8$17h21634fd5714000aaE",
            "utf8_idents::საჭმელად_გემრიელი_სადილი"
        );
    }

    #[test]
    fn demangle_issue_60925() {
        t_nohash!(
            "_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h059a991a004536adE",
            "issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
        );
    }
}

Coverage Report

Created: 2024-10-16 07:58

Line	Count	Source (jump to first uncovered line)
1		use core::char;
2		use core::fmt;
3
4		/// Representation of a demangled symbol name.
5		pub struct Demangle<'a> {
6		inner: &'a str,
7		/// The number of ::-separated elements in the original name.
8		elements: usize,
9		}
10
11		/// De-mangles a Rust symbol into a more readable version
12		///
13		/// All Rust symbols by default are mangled as they contain characters that
14		/// cannot be represented in all object files. The mangling mechanism is similar
15		/// to C++'s, but Rust has a few specifics to handle items like lifetimes in
16		/// symbols.
17		///
18		/// This function will take a mangled symbol and return a value. When printed,
19		/// the de-mangled version will be written. If the symbol does not look like
20		/// a mangled symbol, the original value will be written instead.
21		///
22		/// # Examples
23		///
24		/// ```
25		/// use rustc_demangle::demangle;
26		///
27		/// assert_eq!(demangle("_ZN4testE").to_string(), "test");
28		/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
29		/// assert_eq!(demangle("foo").to_string(), "foo");
30		/// ```
31
32		// All Rust symbols are in theory lists of "::"-separated identifiers. Some
33		// assemblers, however, can't handle these characters in symbol names. To get
34		// around this, we use C++-style mangling. The mangling method is:
35		//
36		// 1. Prefix the symbol with "_ZN"
37		// 2. For each element of the path, emit the length plus the element
38		// 3. End the path with "E"
39		//
40		// For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".
41		//
42		// We're the ones printing our backtraces, so we can't rely on anything else to
43		// demangle our symbols. It's much nicer to look at demangled symbols, so
44		// this function is implemented to give us nice pretty output.
45		//
46		// Note that this demangler isn't quite as fancy as it could be. We have lots
47		// of other information in our symbols like hashes, version, type information,
48		// etc. Additionally, this doesn't handle glue symbols at all.
49	0	pub fn demangle(s: &str) -> Result<(Demangle, &str), ()> {
50		// First validate the symbol. If it doesn't look like anything we're
51		// expecting, we just print it literally. Note that we must handle non-Rust
52		// symbols because we could have any function in the backtrace.
53	0	let inner = if s.starts_with("_ZN") {
54	0	&s[3..]
55	0	} else if s.starts_with("ZN") {
56		// On Windows, dbghelp strips leading underscores, so we accept "ZN...E"
57		// form too.
58	0	&s[2..]
59	0	} else if s.starts_with("__ZN") {
60		// On OSX, symbols are prefixed with an extra _
61	0	&s[4..]
62		} else {
63	0	return Err(());
64		};
65
66		// only work with ascii text
67	0	if inner.bytes().any(\|c\| c & 0x80 != 0) {
68	0	return Err(());
69	0	}
70	0
71	0	let mut elements = 0;
72	0	let mut chars = inner.chars();
73	0	let mut c = chars.next().ok_or(())?;
74	0	while c != 'E' {
75		// Decode an identifier element's length.
76	0	if !c.is_digit(10) {
77	0	return Err(());
78	0	}
79	0	let mut len = 0usize;
80	0	while let Some(d) = c.to_digit(10) {
81	0	len = len
82	0	.checked_mul(10)
83	0	.and_then(\|len\| len.checked_add(d as usize))
84	0	.ok_or(())?;
85	0	c = chars.next().ok_or(())?;
86		}
87
88		// `c` already contains the first character of this identifier, skip it and
89		// all the other characters of this identifier, to reach the next element.
90	0	for _ in 0..len {
91	0	c = chars.next().ok_or(())?;
92		}
93
94	0	elements += 1;
95		}
96
97	0	Ok((Demangle { inner, elements }, chars.as_str()))
98	0	}
99
100		// Rust hashes are hex digits with an `h` prepended.
101	0	fn is_rust_hash(s: &str) -> bool {
102	0	s.starts_with('h') && s[1..].chars().all(\|c\| c.is_digit(16))
103	0	}
104
105		impl<'a> fmt::Display for Demangle<'a> {
106	0	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
107	0	// Alright, let's do this.
108	0	let mut inner = self.inner;
109	0	for element in 0..self.elements {
110	0	let mut rest = inner;
111	0	while rest.chars().next().unwrap().is_digit(10) {
112	0	rest = &rest[1..];
113	0	}
114	0	let i: usize = inner[..(inner.len() - rest.len())].parse().unwrap();
115	0	inner = &rest[i..];
116	0	rest = &rest[..i];
117	0	// Skip printing the hash if alternate formatting
118	0	// was requested.
119	0	if f.alternate() && element + 1 == self.elements && is_rust_hash(&rest) {
120	0	break;
121	0	}
122	0	if element != 0 {
123	0	f.write_str("::")?;
124	0	}
125	0	if rest.starts_with("_$") {
126	0	rest = &rest[1..];
127	0	}
128	0	loop {
129	0	if rest.starts_with('.') {
130	0	if let Some('.') = rest[1..].chars().next() {
131	0	f.write_str("::")?;
132	0	rest = &rest[2..];
133		} else {
134	0	f.write_str(".")?;
135	0	rest = &rest[1..];
136		}
137	0	} else if rest.starts_with('$') {
138	0	let (escape, after_escape) = if let Some(end) = rest[1..].find('$') {
139	0	(&rest[1..=end], &rest[end + 2..])
140		} else {
141	0	break;
142		};
143
144		// see src/librustc_codegen_utils/symbol_names/legacy.rs for these mappings
145	0	let unescaped = match escape {
146	0	"SP" => "@",
147	0	"BP" => "*",
148	0	"RF" => "&",
149	0	"LT" => "<",
150	0	"GT" => ">",
151	0	"LP" => "(",
152	0	"RP" => ")",
153	0	"C" => ",",
154
155		_ => {
156	0	if escape.starts_with('u') {
157	0	let digits = &escape[1..];
158	0	let all_lower_hex = digits.chars().all(\|c\| match c {
159	0	'0'..='9' \| 'a'..='f' => true,
160	0	_ => false,
161	0	});
162	0	let c = u32::from_str_radix(digits, 16)
163	0	.ok()
164	0	.and_then(char::from_u32);
165	0	if let (true, Some(c)) = (all_lower_hex, c) {
166		// FIXME(eddyb) do we need to filter out control codepoints?
167	0	if !c.is_control() {
168	0	c.fmt(f)?;
169	0	rest = after_escape;
170	0	continue;
171	0	}
172	0	}
173	0	}
174	0	break;
175		}
176		};
177	0	f.write_str(unescaped)?;
178	0	rest = after_escape;
179	0	} else if let Some(i) = rest.find(\|c\| c == '$' \|\| c == '.') {
180	0	f.write_str(&rest[..i])?;
181	0	rest = &rest[i..];
182		} else {
183	0	break;
184		}
185		}
186	0	f.write_str(rest)?;
187		}
188
189	0	Ok(())
190	0	}
191		}
192
193		#[cfg(test)]
194		mod tests {
195		use std::prelude::v1::*;
196
197		macro_rules! t {
198		($a:expr, $b:expr) => {
199		assert!(ok($a, $b))
200		};
201		}
202
203		macro_rules! t_err {
204		($a:expr) => {
205		assert!(ok_err($a))
206		};
207		}
208
209		macro_rules! t_nohash {
210		($a:expr, $b:expr) => {{
211		assert_eq!(format!("{:#}", ::demangle($a)), $b);
212		}};
213		}
214
215		fn ok(sym: &str, expected: &str) -> bool {
216		match ::try_demangle(sym) {
217		Ok(s) => {
218		if s.to_string() == expected {
219		true
220		} else {
221		println!("\n{}\n!=\n{}\n", s, expected);
222		false
223		}
224		}
225		Err(_) => {
226		println!("error demangling");
227		false
228		}
229		}
230		}
231
232		fn ok_err(sym: &str) -> bool {
233		match ::try_demangle(sym) {
234		Ok(_) => {
235		println!("succeeded in demangling");
236		false
237		}
238		Err(_) => ::demangle(sym).to_string() == sym,
239		}
240		}
241
242		#[test]
243		fn demangle() {
244		t_err!("test");
245		t!("_ZN4testE", "test");
246		t_err!("_ZN4test");
247		t!("_ZN4test1a2bcE", "test::a::bc");
248		}
249
250		#[test]
251		fn demangle_dollars() {
252		t!("_ZN4$RP$E", ")");
253		t!("_ZN8$RF$testE", "&test");
254		t!("_ZN8$BP$test4foobE", "*test::foob");
255		t!("_ZN9$u20$test4foobE", " test::foob");
256		t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
257		}
258
259		#[test]
260		fn demangle_many_dollars() {
261		t!("_ZN13test$u20$test4foobE", "test test::foob");
262		t!("_ZN12test$BP$test4foobE", "test*test::foob");
263		}
264
265		#[test]
266		fn demangle_osx() {
267		t!(
268		"__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E",
269		"alloc::allocator::Layout::for_value::h02a996811f781011"
270		);
271		t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
272		t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
273		}
274
275		#[test]
276		fn demangle_windows() {
277		t!("ZN4testE", "test");
278		t!("ZN13test$u20$test4foobE", "test test::foob");
279		t!("ZN12test$RF$test4foobE", "test&test::foob");
280		}
281
282		#[test]
283		fn demangle_elements_beginning_with_underscore() {
284		t!("_ZN13_$LT$test$GT$E", "<test>");
285		t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
286		t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
287		}
288
289		#[test]
290		fn demangle_trait_impls() {
291		t!(
292		"_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
293		"<Test + 'static as foo::Bar<Test>>::bar"
294		);
295		}
296
297		#[test]
298		fn demangle_without_hash() {
299		let s = "_ZN3foo17h05af221e174051e9E";
300		t!(s, "foo::h05af221e174051e9");
301		t_nohash!(s, "foo");
302		}
303
304		#[test]
305		fn demangle_without_hash_edgecases() {
306		// One element, no hash.
307		t_nohash!("_ZN3fooE", "foo");
308		// Two elements, no hash.
309		t_nohash!("_ZN3foo3barE", "foo::bar");
310		// Longer-than-normal hash.
311		t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
312		// Shorter-than-normal hash.
313		t_nohash!("_ZN3foo5h05afE", "foo");
314		// Valid hash, but not at the end.
315		t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
316		// Not a valid hash, missing the 'h'.
317		t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
318		// Not a valid hash, has a non-hex-digit.
319		t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
320		}
321
322		#[test]
323		fn demangle_thinlto() {
324		// One element, no hash.
325		t!("_ZN3fooE.llvm.9D1C9369", "foo");
326		t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
327		t_nohash!(
328		"_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9",
329		"backtrace::foo"
330		);
331		}
332
333		#[test]
334		fn demangle_llvm_ir_branch_labels() {
335		t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
336		t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
337		}
338
339		#[test]
340		fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
341		t_err!("_ZN3fooE.llvm moocow");
342		}
343
344		#[test]
345		fn dont_panic() {
346		::demangle("_ZN2222222222222222222222EE").to_string();
347		::demangle("_ZN5*70527e27.ll34csaғE").to_string();
348		::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
349		::demangle(
350		"\
351		_ZN5~saäb4e\n\
352		2734cOsbE\n\
353		5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
354		",
355		)
356		.to_string();
357		}
358
359		#[test]
360		fn invalid_no_chop() {
361		t_err!("_ZNfooE");
362		}
363
364		#[test]
365		fn handle_assoc_types() {
366		t!("_ZN151_$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
367		}
368
369		#[test]
370		fn handle_bang() {
371		t!(
372		"_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
373		"<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
374		);
375		}
376
377		#[test]
378		fn demangle_utf8_idents() {
379		t_nohash!(
380		"_ZN11utf8_idents157_$u10e1$$u10d0$$u10ed$$u10db$$u10d4$$u10da$$u10d0$$u10d3$_$u10d2$$u10d4$$u10db$$u10e0$$u10d8$$u10d4$$u10da$$u10d8$_$u10e1$$u10d0$$u10d3$$u10d8$$u10da$$u10d8$17h21634fd5714000aaE",
381		"utf8_idents::საჭმელად_გემრიელი_სადილი"
382		);
383		}
384
385		#[test]
386		fn demangle_issue_60925() {
387		t_nohash!(
388		"_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h059a991a004536adE",
389		"issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
390		);
391		}
392		}