392 lines
14 KiB
Rust
392 lines
14 KiB
Rust
use core::char;
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use core::fmt;
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/// Representation of a demangled symbol name.
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pub struct Demangle<'a> {
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inner: &'a str,
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/// The number of ::-separated elements in the original name.
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elements: usize,
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}
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/// De-mangles a Rust symbol into a more readable version
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///
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/// All Rust symbols by default are mangled as they contain characters that
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/// cannot be represented in all object files. The mangling mechanism is similar
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/// to C++'s, but Rust has a few specifics to handle items like lifetimes in
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/// symbols.
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///
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/// This function will take a **mangled** symbol and return a value. When printed,
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/// the de-mangled version will be written. If the symbol does not look like
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/// a mangled symbol, the original value will be written instead.
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///
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/// # Examples
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///
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/// ```
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/// use rustc_demangle::demangle;
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///
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/// assert_eq!(demangle("_ZN4testE").to_string(), "test");
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/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
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/// assert_eq!(demangle("foo").to_string(), "foo");
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/// ```
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// All Rust symbols are in theory lists of "::"-separated identifiers. Some
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// assemblers, however, can't handle these characters in symbol names. To get
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// around this, we use C++-style mangling. The mangling method is:
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//
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// 1. Prefix the symbol with "_ZN"
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// 2. For each element of the path, emit the length plus the element
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// 3. End the path with "E"
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//
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// For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".
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//
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// We're the ones printing our backtraces, so we can't rely on anything else to
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// demangle our symbols. It's *much* nicer to look at demangled symbols, so
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// this function is implemented to give us nice pretty output.
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//
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// Note that this demangler isn't quite as fancy as it could be. We have lots
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// of other information in our symbols like hashes, version, type information,
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// etc. Additionally, this doesn't handle glue symbols at all.
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pub fn demangle(s: &str) -> Result<(Demangle, &str), ()> {
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// First validate the symbol. If it doesn't look like anything we're
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// expecting, we just print it literally. Note that we must handle non-Rust
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// symbols because we could have any function in the backtrace.
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let inner = if s.starts_with("_ZN") {
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&s[3..]
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} else if s.starts_with("ZN") {
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// On Windows, dbghelp strips leading underscores, so we accept "ZN...E"
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// form too.
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&s[2..]
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} else if s.starts_with("__ZN") {
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// On OSX, symbols are prefixed with an extra _
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&s[4..]
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} else {
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return Err(());
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};
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// only work with ascii text
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if inner.bytes().any(|c| c & 0x80 != 0) {
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return Err(());
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}
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let mut elements = 0;
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let mut chars = inner.chars();
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let mut c = chars.next().ok_or(())?;
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while c != 'E' {
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// Decode an identifier element's length.
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if !c.is_digit(10) {
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return Err(());
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}
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let mut len = 0usize;
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while let Some(d) = c.to_digit(10) {
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len = len
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.checked_mul(10)
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.and_then(|len| len.checked_add(d as usize))
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.ok_or(())?;
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c = chars.next().ok_or(())?;
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}
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// `c` already contains the first character of this identifier, skip it and
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// all the other characters of this identifier, to reach the next element.
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for _ in 0..len {
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c = chars.next().ok_or(())?;
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}
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elements += 1;
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}
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Ok((Demangle { inner, elements }, chars.as_str()))
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}
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// Rust hashes are hex digits with an `h` prepended.
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fn is_rust_hash(s: &str) -> bool {
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s.starts_with('h') && s[1..].chars().all(|c| c.is_digit(16))
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}
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impl<'a> fmt::Display for Demangle<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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// Alright, let's do this.
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let mut inner = self.inner;
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for element in 0..self.elements {
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let mut rest = inner;
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while rest.chars().next().unwrap().is_digit(10) {
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rest = &rest[1..];
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}
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let i: usize = inner[..(inner.len() - rest.len())].parse().unwrap();
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inner = &rest[i..];
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rest = &rest[..i];
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// Skip printing the hash if alternate formatting
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// was requested.
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if f.alternate() && element + 1 == self.elements && is_rust_hash(&rest) {
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break;
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}
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if element != 0 {
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f.write_str("::")?;
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}
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if rest.starts_with("_$") {
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rest = &rest[1..];
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}
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loop {
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if rest.starts_with('.') {
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if let Some('.') = rest[1..].chars().next() {
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f.write_str("::")?;
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rest = &rest[2..];
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} else {
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f.write_str(".")?;
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rest = &rest[1..];
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}
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} else if rest.starts_with('$') {
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let (escape, after_escape) = if let Some(end) = rest[1..].find('$') {
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(&rest[1..=end], &rest[end + 2..])
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} else {
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break;
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};
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// see src/librustc_codegen_utils/symbol_names/legacy.rs for these mappings
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let unescaped = match escape {
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"SP" => "@",
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"BP" => "*",
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"RF" => "&",
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"LT" => "<",
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"GT" => ">",
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"LP" => "(",
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"RP" => ")",
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"C" => ",",
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_ => {
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if escape.starts_with('u') {
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let digits = &escape[1..];
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let all_lower_hex = digits.chars().all(|c| match c {
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'0'..='9' | 'a'..='f' => true,
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_ => false,
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});
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let c = u32::from_str_radix(digits, 16)
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.ok()
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.and_then(char::from_u32);
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if let (true, Some(c)) = (all_lower_hex, c) {
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// FIXME(eddyb) do we need to filter out control codepoints?
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if !c.is_control() {
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c.fmt(f)?;
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rest = after_escape;
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continue;
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}
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}
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}
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break;
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}
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};
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f.write_str(unescaped)?;
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rest = after_escape;
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} else if let Some(i) = rest.find(|c| c == '$' || c == '.') {
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f.write_str(&rest[..i])?;
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rest = &rest[i..];
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} else {
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break;
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}
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}
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f.write_str(rest)?;
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use std::prelude::v1::*;
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macro_rules! t {
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($a:expr, $b:expr) => {
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assert!(ok($a, $b))
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};
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}
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macro_rules! t_err {
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($a:expr) => {
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assert!(ok_err($a))
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};
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}
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macro_rules! t_nohash {
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($a:expr, $b:expr) => {{
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assert_eq!(format!("{:#}", ::demangle($a)), $b);
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}};
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}
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fn ok(sym: &str, expected: &str) -> bool {
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match ::try_demangle(sym) {
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Ok(s) => {
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if s.to_string() == expected {
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true
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} else {
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println!("\n{}\n!=\n{}\n", s, expected);
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false
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}
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}
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Err(_) => {
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println!("error demangling");
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false
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}
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}
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}
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fn ok_err(sym: &str) -> bool {
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match ::try_demangle(sym) {
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Ok(_) => {
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println!("succeeded in demangling");
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false
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}
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Err(_) => ::demangle(sym).to_string() == sym,
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}
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}
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#[test]
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fn demangle() {
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t_err!("test");
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t!("_ZN4testE", "test");
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t_err!("_ZN4test");
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t!("_ZN4test1a2bcE", "test::a::bc");
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}
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#[test]
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fn demangle_dollars() {
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t!("_ZN4$RP$E", ")");
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t!("_ZN8$RF$testE", "&test");
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t!("_ZN8$BP$test4foobE", "*test::foob");
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t!("_ZN9$u20$test4foobE", " test::foob");
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t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
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}
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#[test]
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fn demangle_many_dollars() {
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t!("_ZN13test$u20$test4foobE", "test test::foob");
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t!("_ZN12test$BP$test4foobE", "test*test::foob");
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}
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#[test]
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fn demangle_osx() {
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t!(
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"__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E",
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"alloc::allocator::Layout::for_value::h02a996811f781011"
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);
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t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
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t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
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}
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#[test]
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fn demangle_windows() {
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t!("ZN4testE", "test");
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t!("ZN13test$u20$test4foobE", "test test::foob");
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t!("ZN12test$RF$test4foobE", "test&test::foob");
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}
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#[test]
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fn demangle_elements_beginning_with_underscore() {
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t!("_ZN13_$LT$test$GT$E", "<test>");
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t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
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t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
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}
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#[test]
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fn demangle_trait_impls() {
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t!(
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"_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
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"<Test + 'static as foo::Bar<Test>>::bar"
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);
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}
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#[test]
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fn demangle_without_hash() {
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let s = "_ZN3foo17h05af221e174051e9E";
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t!(s, "foo::h05af221e174051e9");
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t_nohash!(s, "foo");
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}
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#[test]
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fn demangle_without_hash_edgecases() {
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// One element, no hash.
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t_nohash!("_ZN3fooE", "foo");
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// Two elements, no hash.
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t_nohash!("_ZN3foo3barE", "foo::bar");
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// Longer-than-normal hash.
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t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
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// Shorter-than-normal hash.
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t_nohash!("_ZN3foo5h05afE", "foo");
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// Valid hash, but not at the end.
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t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
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// Not a valid hash, missing the 'h'.
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t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
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// Not a valid hash, has a non-hex-digit.
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t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
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}
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#[test]
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fn demangle_thinlto() {
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// One element, no hash.
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t!("_ZN3fooE.llvm.9D1C9369", "foo");
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t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
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t_nohash!(
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"_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9",
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"backtrace::foo"
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);
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}
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#[test]
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fn demangle_llvm_ir_branch_labels() {
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t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
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t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
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}
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#[test]
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fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
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t_err!("_ZN3fooE.llvm moocow");
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}
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#[test]
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fn dont_panic() {
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::demangle("_ZN2222222222222222222222EE").to_string();
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::demangle("_ZN5*70527e27.ll34csaғE").to_string();
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::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
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::demangle(
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"\
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_ZN5~saäb4e\n\
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2734cOsbE\n\
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5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
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",
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)
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.to_string();
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}
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#[test]
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fn invalid_no_chop() {
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t_err!("_ZNfooE");
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}
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#[test]
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fn handle_assoc_types() {
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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$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
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}
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#[test]
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fn handle_bang() {
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t!(
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"_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
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"<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
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);
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}
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#[test]
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fn demangle_utf8_idents() {
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t_nohash!(
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"_ZN11utf8_idents157_$u10e1$$u10d0$$u10ed$$u10db$$u10d4$$u10da$$u10d0$$u10d3$_$u10d2$$u10d4$$u10db$$u10e0$$u10d8$$u10d4$$u10da$$u10d8$_$u10e1$$u10d0$$u10d3$$u10d8$$u10da$$u10d8$17h21634fd5714000aaE",
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"utf8_idents::საჭმელად_გემრიელი_სადილი"
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);
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}
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#[test]
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fn demangle_issue_60925() {
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t_nohash!(
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"_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h059a991a004536adE",
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"issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
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);
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}
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}
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