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-rw-r--r--third_party/rust/rustc-demangle/.cargo-checksum.json1
-rw-r--r--third_party/rust/rustc-demangle/Cargo.toml35
-rw-r--r--third_party/rust/rustc-demangle/LICENSE-APACHE201
-rw-r--r--third_party/rust/rustc-demangle/LICENSE-MIT25
-rw-r--r--third_party/rust/rustc-demangle/README.md48
-rw-r--r--third_party/rust/rustc-demangle/src/legacy.rs392
-rw-r--r--third_party/rust/rustc-demangle/src/lib.rs493
-rw-r--r--third_party/rust/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit10
-rw-r--r--third_party/rust/rustc-demangle/src/v0.rs1530
9 files changed, 2735 insertions, 0 deletions
diff --git a/third_party/rust/rustc-demangle/.cargo-checksum.json b/third_party/rust/rustc-demangle/.cargo-checksum.json
new file mode 100644
index 0000000000..ccb0200bfb
--- /dev/null
+++ b/third_party/rust/rustc-demangle/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"574e364beff42bec64bc576759ff927d1d2ba3fb52c595dd8bc02864778f8406","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"378f5840b258e2779c39418f3f2d7b2ba96f1c7917dd6be0713f88305dbda397","README.md":"3bb7af78423e95b207beebd452cdd973d65663cf25a0fc9358c588f53783293c","src/legacy.rs":"b4d5a140ed0bf2d792431961d6fd44a21c99235489a2c9f6717d1577a42c09ce","src/lib.rs":"a6aef558ecbdcad7ed63d4590863a29233264396b6b21745b498df1602776457","src/v0-large-test-symbols/early-recursion-limit":"96861a7042db35ee0bd04802820d0f2d6a3b534ce13547912b6364001ffd1494","src/v0.rs":"4e5bd069aa61def3dc732b3a285861914895272668ddfcb6b9eef46dd5713041"},"package":"7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"} \ No newline at end of file
diff --git a/third_party/rust/rustc-demangle/Cargo.toml b/third_party/rust/rustc-demangle/Cargo.toml
new file mode 100644
index 0000000000..2253b63b1d
--- /dev/null
+++ b/third_party/rust/rustc-demangle/Cargo.toml
@@ -0,0 +1,35 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+name = "rustc-demangle"
+version = "0.1.21"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+description = "Rust compiler symbol demangling.\n"
+homepage = "https://github.com/alexcrichton/rustc-demangle"
+documentation = "https://docs.rs/rustc-demangle"
+readme = "README.md"
+license = "MIT/Apache-2.0"
+repository = "https://github.com/alexcrichton/rustc-demangle"
+[profile.release]
+lto = true
+[dependencies.compiler_builtins]
+version = "0.1.2"
+optional = true
+
+[dependencies.core]
+version = "1.0.0"
+optional = true
+package = "rustc-std-workspace-core"
+
+[features]
+rustc-dep-of-std = ["core", "compiler_builtins"]
diff --git a/third_party/rust/rustc-demangle/LICENSE-APACHE b/third_party/rust/rustc-demangle/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/third_party/rust/rustc-demangle/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+ whether in tort (including negligence), contract, or otherwise,
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+
+ http://www.apache.org/licenses/LICENSE-2.0
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+Unless required by applicable law or agreed to in writing, software
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diff --git a/third_party/rust/rustc-demangle/LICENSE-MIT b/third_party/rust/rustc-demangle/LICENSE-MIT
new file mode 100644
index 0000000000..39e0ed6602
--- /dev/null
+++ b/third_party/rust/rustc-demangle/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/rustc-demangle/README.md b/third_party/rust/rustc-demangle/README.md
new file mode 100644
index 0000000000..0833e1e245
--- /dev/null
+++ b/third_party/rust/rustc-demangle/README.md
@@ -0,0 +1,48 @@
+# rustc-demangle
+
+Demangling for Rust symbols, written in Rust.
+
+[Documentation](https://docs.rs/rustc-demangle)
+
+## Usage
+
+You can add this as a dependency via your `Cargo.toml`
+
+```toml
+[dependencies]
+rustc-demangle = "0.1"
+```
+
+and then be sure to check out the [crate
+documentation](https://docs.rs/rustc-demangle) for usage.
+
+## Usage from non-Rust languages
+
+You can also use this crate from other languages via the C API wrapper in the
+`crates/capi` directory. This can be build with:
+
+```sh
+$ cargo build -p rustc-demangle-capi --release
+```
+
+You'll then find `target/release/librustc_demangle.a` and
+`target/release/librustc_demangle.so` (or a different name depending on your
+platform). These objects implement the interface specified in
+`crates/capi/include/rustc_demangle.h`.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+ http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+ http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in rustc-demangle you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
diff --git a/third_party/rust/rustc-demangle/src/legacy.rs b/third_party/rust/rustc-demangle/src/legacy.rs
new file mode 100644
index 0000000000..d55f3a1fdd
--- /dev/null
+++ b/third_party/rust/rustc-demangle/src/legacy.rs
@@ -0,0 +1,392 @@
+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$3foo17h059a991a004536adE",
+ "issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
+ );
+ }
+}
diff --git a/third_party/rust/rustc-demangle/src/lib.rs b/third_party/rust/rustc-demangle/src/lib.rs
new file mode 100644
index 0000000000..1ecb13fee6
--- /dev/null
+++ b/third_party/rust/rustc-demangle/src/lib.rs
@@ -0,0 +1,493 @@
+//! Demangle Rust compiler symbol names.
+//!
+//! This crate provides a `demangle` function which will return a `Demangle`
+//! sentinel value that can be used to learn about the demangled version of a
+//! symbol name. The demangled representation will be the same as the original
+//! if it doesn't look like a mangled symbol name.
+//!
+//! `Demangle` can be formatted with the `Display` trait. The alternate
+//! modifier (`#`) can be used to format the symbol name without the
+//! trailing hash value.
+//!
+//! # Examples
+//!
+//! ```
+//! use rustc_demangle::demangle;
+//!
+//! assert_eq!(demangle("_ZN4testE").to_string(), "test");
+//! assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
+//! assert_eq!(demangle("foo").to_string(), "foo");
+//! // With hash
+//! assert_eq!(format!("{}", demangle("_ZN3foo17h05af221e174051e9E")), "foo::h05af221e174051e9");
+//! // Without hash
+//! assert_eq!(format!("{:#}", demangle("_ZN3foo17h05af221e174051e9E")), "foo");
+//! ```
+
+#![no_std]
+#![deny(missing_docs)]
+
+#[cfg(test)]
+#[macro_use]
+extern crate std;
+
+// HACK(eddyb) helper macros for tests.
+#[cfg(test)]
+macro_rules! assert_contains {
+ ($s:expr, $needle:expr) => {{
+ let (s, needle) = ($s, $needle);
+ assert!(
+ s.contains(needle),
+ "{:?} should've contained {:?}",
+ s,
+ needle
+ );
+ }};
+}
+#[cfg(test)]
+macro_rules! assert_ends_with {
+ ($s:expr, $suffix:expr) => {{
+ let (s, suffix) = ($s, $suffix);
+ assert!(
+ s.ends_with(suffix),
+ "{:?} should've ended in {:?}",
+ s,
+ suffix
+ );
+ }};
+}
+
+mod legacy;
+mod v0;
+
+use core::fmt::{self, Write as _};
+
+/// Representation of a demangled symbol name.
+pub struct Demangle<'a> {
+ style: Option<DemangleStyle<'a>>,
+ original: &'a str,
+ suffix: &'a str,
+}
+
+enum DemangleStyle<'a> {
+ Legacy(legacy::Demangle<'a>),
+ V0(v0::Demangle<'a>),
+}
+
+/// De-mangles a Rust symbol into a more readable version
+///
+/// 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");
+/// ```
+pub fn demangle(mut s: &str) -> Demangle {
+ // During ThinLTO LLVM may import and rename internal symbols, so strip out
+ // those endings first as they're one of the last manglings applied to symbol
+ // names.
+ let llvm = ".llvm.";
+ if let Some(i) = s.find(llvm) {
+ let candidate = &s[i + llvm.len()..];
+ let all_hex = candidate.chars().all(|c| match c {
+ 'A'..='F' | '0'..='9' | '@' => true,
+ _ => false,
+ });
+
+ if all_hex {
+ s = &s[..i];
+ }
+ }
+
+ let mut suffix = "";
+ let mut style = match legacy::demangle(s) {
+ Ok((d, s)) => {
+ suffix = s;
+ Some(DemangleStyle::Legacy(d))
+ }
+ Err(()) => match v0::demangle(s) {
+ Ok((d, s)) => {
+ suffix = s;
+ Some(DemangleStyle::V0(d))
+ }
+ // FIXME(eddyb) would it make sense to treat an unknown-validity
+ // symbol (e.g. one that errored with `RecursedTooDeep`) as
+ // v0-mangled, and have the error show up in the demangling?
+ // (that error already gets past this initial check, and therefore
+ // will show up in the demangling, if hidden behind a backref)
+ Err(v0::ParseError::Invalid) | Err(v0::ParseError::RecursedTooDeep) => None,
+ },
+ };
+
+ // Output like LLVM IR adds extra period-delimited words. See if
+ // we are in that case and save the trailing words if so.
+ if !suffix.is_empty() {
+ if suffix.starts_with('.') && is_symbol_like(suffix) {
+ // Keep the suffix.
+ } else {
+ // Reset the suffix and invalidate the demangling.
+ suffix = "";
+ style = None;
+ }
+ }
+
+ Demangle {
+ style,
+ original: s,
+ suffix,
+ }
+}
+
+/// Error returned from the `try_demangle` function below when demangling fails.
+#[derive(Debug, Clone)]
+pub struct TryDemangleError {
+ _priv: (),
+}
+
+/// The same as `demangle`, except return an `Err` if the string does not appear
+/// to be a Rust symbol, rather than "demangling" the given string as a no-op.
+///
+/// ```
+/// extern crate rustc_demangle;
+///
+/// let not_a_rust_symbol = "la la la";
+///
+/// // The `try_demangle` function will reject strings which are not Rust symbols.
+/// assert!(rustc_demangle::try_demangle(not_a_rust_symbol).is_err());
+///
+/// // While `demangle` will just pass the non-symbol through as a no-op.
+/// assert_eq!(rustc_demangle::demangle(not_a_rust_symbol).as_str(), not_a_rust_symbol);
+/// ```
+pub fn try_demangle(s: &str) -> Result<Demangle, TryDemangleError> {
+ let sym = demangle(s);
+ if sym.style.is_some() {
+ Ok(sym)
+ } else {
+ Err(TryDemangleError { _priv: () })
+ }
+}
+
+impl<'a> Demangle<'a> {
+ /// Returns the underlying string that's being demangled.
+ pub fn as_str(&self) -> &'a str {
+ self.original
+ }
+}
+
+fn is_symbol_like(s: &str) -> bool {
+ s.chars().all(|c| {
+ // Once `char::is_ascii_punctuation` and `char::is_ascii_alphanumeric`
+ // have been stable for long enough, use those instead for clarity
+ is_ascii_alphanumeric(c) || is_ascii_punctuation(c)
+ })
+}
+
+// Copied from the documentation of `char::is_ascii_alphanumeric`
+fn is_ascii_alphanumeric(c: char) -> bool {
+ match c {
+ '\u{0041}'..='\u{005A}' | '\u{0061}'..='\u{007A}' | '\u{0030}'..='\u{0039}' => true,
+ _ => false,
+ }
+}
+
+// Copied from the documentation of `char::is_ascii_punctuation`
+fn is_ascii_punctuation(c: char) -> bool {
+ match c {
+ '\u{0021}'..='\u{002F}'
+ | '\u{003A}'..='\u{0040}'
+ | '\u{005B}'..='\u{0060}'
+ | '\u{007B}'..='\u{007E}' => true,
+ _ => false,
+ }
+}
+
+impl<'a> fmt::Display for DemangleStyle<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match *self {
+ DemangleStyle::Legacy(ref d) => fmt::Display::fmt(d, f),
+ DemangleStyle::V0(ref d) => fmt::Display::fmt(d, f),
+ }
+ }
+}
+
+// Maximum size of the symbol that we'll print.
+const MAX_SIZE: usize = 1_000_000;
+
+#[derive(Copy, Clone, Debug)]
+struct SizeLimitExhausted;
+
+struct SizeLimitedFmtAdapter<F> {
+ remaining: Result<usize, SizeLimitExhausted>,
+ inner: F,
+}
+
+impl<F: fmt::Write> fmt::Write for SizeLimitedFmtAdapter<F> {
+ fn write_str(&mut self, s: &str) -> fmt::Result {
+ self.remaining = self
+ .remaining
+ .and_then(|r| r.checked_sub(s.len()).ok_or(SizeLimitExhausted));
+
+ match self.remaining {
+ Ok(_) => self.inner.write_str(s),
+ Err(SizeLimitExhausted) => Err(fmt::Error),
+ }
+ }
+}
+
+impl<'a> fmt::Display for Demangle<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self.style {
+ None => f.write_str(self.original)?,
+ Some(ref d) => {
+ let alternate = f.alternate();
+ let mut size_limited_fmt = SizeLimitedFmtAdapter {
+ remaining: Ok(MAX_SIZE),
+ inner: &mut *f,
+ };
+ let fmt_result = if alternate {
+ write!(size_limited_fmt, "{:#}", d)
+ } else {
+ write!(size_limited_fmt, "{}", d)
+ };
+ let size_limit_result = size_limited_fmt.remaining.map(|_| ());
+
+ // Translate a `fmt::Error` generated by `SizeLimitedFmtAdapter`
+ // into an error message, instead of propagating it upwards
+ // (which could cause panicking from inside e.g. `std::io::print`).
+ match (fmt_result, size_limit_result) {
+ (Err(_), Err(SizeLimitExhausted)) => f.write_str("{size limit reached}")?,
+
+ _ => {
+ fmt_result?;
+ size_limit_result
+ .expect("`fmt::Error` from `SizeLimitedFmtAdapter` was discarded");
+ }
+ }
+ }
+ }
+ f.write_str(self.suffix)
+ }
+}
+
+impl<'a> fmt::Debug for Demangle<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ fmt::Display::fmt(self, f)
+ }
+}
+
+#[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, $b:expr) => {{
+ assert_eq!(format!("{:#}", super::demangle($a)), $b);
+ }};
+ }
+
+ fn ok(sym: &str, expected: &str) -> bool {
+ match super::try_demangle(sym) {
+ Ok(s) => {
+ if s.to_string() == expected {
+ true
+ } else {
+ println!("\n{}\n!=\n{}\n", s, expected);
+ false
+ }
+ }
+ Err(_) => {
+ println!("error demangling");
+ false
+ }
+ }
+ }
+
+ fn ok_err(sym: &str) -> bool {
+ match super::try_demangle(sym) {
+ Ok(_) => {
+ println!("succeeded in demangling");
+ false
+ }
+ Err(_) => super::demangle(sym).to_string() == sym,
+ }
+ }
+
+ #[test]
+ fn demangle() {
+ t_err!("test");
+ t!("_ZN4testE", "test");
+ t_err!("_ZN4test");
+ t!("_ZN4test1a2bcE", "test::a::bc");
+ }
+
+ #[test]
+ fn demangle_dollars() {
+ t!("_ZN4$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$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
+ }
+
+ #[test]
+ fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
+ t_err!("_ZN3fooE.llvm moocow");
+ }
+
+ #[test]
+ fn dont_panic() {
+ super::demangle("_ZN2222222222222222222222EE").to_string();
+ super::demangle("_ZN5*70527e27.ll34csaғE").to_string();
+ super::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
+ super::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$6report17hfc41d0da4a40b3e8E",
+ "<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
+ );
+ }
+
+ #[test]
+ fn limit_recursion() {
+ assert_contains!(
+ super::demangle("_RNvB_1a").to_string(),
+ "{recursion limit reached}"
+ );
+ assert_contains!(
+ super::demangle("_RMC0RB2_").to_string(),
+ "{recursion limit reached}"
+ );
+ }
+
+ #[test]
+ fn limit_output() {
+ assert_ends_with!(
+ super::demangle("RYFG_FGyyEvRYFF_EvRYFFEvERLB_B_B_ERLRjB_B_B_").to_string(),
+ "{size limit reached}"
+ );
+ // NOTE(eddyb) somewhat reduced version of the above, effectively
+ // `<for<...> fn()>` with a larger number of lifetimes in `...`.
+ assert_ends_with!(
+ super::demangle("_RMC0FGZZZ_Eu").to_string(),
+ "{size limit reached}"
+ );
+ }
+}
diff --git a/third_party/rust/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit b/third_party/rust/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit
new file mode 100644
index 0000000000..914d416f70
--- /dev/null
+++ b/third_party/rust/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit
@@ -0,0 +1,10 @@
+# NOTE: empty lines, and lines starting with `#`, are ignored.
+
+# Large test symbols for `v0::test::demangling_limits`, that specifically cause
+# a `RecursedTooDeep` error from `v0::demangle`'s shallow traversal (sanity check)
+# of the mangled symbol, i.e. before any printing coudl be attempted.
+
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diff --git a/third_party/rust/rustc-demangle/src/v0.rs b/third_party/rust/rustc-demangle/src/v0.rs
new file mode 100644
index 0000000000..3e88fa64de
--- /dev/null
+++ b/third_party/rust/rustc-demangle/src/v0.rs
@@ -0,0 +1,1530 @@
+use core::convert::TryFrom;
+use core::{char, fmt, iter, mem, str};
+
+#[allow(unused_macros)]
+macro_rules! write {
+ ($($ignored:tt)*) => {
+ compile_error!(
+ "use `self.print(value)` or `fmt::Trait::fmt(&value, self.out)`, \
+ instead of `write!(self.out, \"{...}\", value)`"
+ )
+ };
+}
+
+// Maximum recursion depth when parsing symbols before we just bail out saying
+// "this symbol is invalid"
+const MAX_DEPTH: u32 = 500;
+
+/// Representation of a demangled symbol name.
+pub struct Demangle<'a> {
+ inner: &'a str,
+}
+
+#[derive(PartialEq, Eq, Debug)]
+pub enum ParseError {
+ /// Symbol doesn't match the expected `v0` grammar.
+ Invalid,
+
+ /// Parsing the symbol crossed the recursion limit (see `MAX_DEPTH`).
+ RecursedTooDeep,
+}
+
+/// De-mangles a Rust symbol into a more readable version
+///
+/// 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.
+pub fn demangle(s: &str) -> Result<(Demangle, &str), ParseError> {
+ // 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.len() > 2 && s.starts_with("_R") {
+ inner = &s[2..];
+ } else if s.len() > 1 && s.starts_with('R') {
+ // On Windows, dbghelp strips leading underscores, so we accept "R..."
+ // form too.
+ inner = &s[1..];
+ } else if s.len() > 3 && s.starts_with("__R") {
+ // On OSX, symbols are prefixed with an extra _
+ inner = &s[3..];
+ } else {
+ return Err(ParseError::Invalid);
+ }
+
+ // Paths always start with uppercase characters.
+ match inner.as_bytes()[0] {
+ b'A'..=b'Z' => {}
+ _ => return Err(ParseError::Invalid),
+ }
+
+ // only work with ascii text
+ if inner.bytes().any(|c| c & 0x80 != 0) {
+ return Err(ParseError::Invalid);
+ }
+
+ // Verify that the symbol is indeed a valid path.
+ let try_parse_path = |parser| {
+ let mut dummy_printer = Printer {
+ parser: Ok(parser),
+ out: None,
+ bound_lifetime_depth: 0,
+ };
+ dummy_printer
+ .print_path(false)
+ .expect("`fmt::Error`s should be impossible without a `fmt::Formatter`");
+ dummy_printer.parser
+ };
+ let mut parser = Parser {
+ sym: inner,
+ next: 0,
+ depth: 0,
+ };
+ parser = try_parse_path(parser)?;
+
+ // Instantiating crate (paths always start with uppercase characters).
+ if let Some(&(b'A'..=b'Z')) = parser.sym.as_bytes().get(parser.next) {
+ parser = try_parse_path(parser)?;
+ }
+
+ Ok((Demangle { inner }, &parser.sym[parser.next..]))
+}
+
+impl<'s> fmt::Display for Demangle<'s> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let mut printer = Printer {
+ parser: Ok(Parser {
+ sym: self.inner,
+ next: 0,
+ depth: 0,
+ }),
+ out: Some(f),
+ bound_lifetime_depth: 0,
+ };
+ printer.print_path(true)
+ }
+}
+
+struct Ident<'s> {
+ /// ASCII part of the identifier.
+ ascii: &'s str,
+ /// Punycode insertion codes for Unicode codepoints, if any.
+ punycode: &'s str,
+}
+
+const SMALL_PUNYCODE_LEN: usize = 128;
+
+impl<'s> Ident<'s> {
+ /// Attempt to decode punycode on the stack (allocation-free),
+ /// and pass the char slice to the closure, if successful.
+ /// This supports up to `SMALL_PUNYCODE_LEN` characters.
+ fn try_small_punycode_decode<F: FnOnce(&[char]) -> R, R>(&self, f: F) -> Option<R> {
+ let mut out = ['\0'; SMALL_PUNYCODE_LEN];
+ let mut out_len = 0;
+ let r = self.punycode_decode(|i, c| {
+ // Check there's space left for another character.
+ out.get(out_len).ok_or(())?;
+
+ // Move the characters after the insert position.
+ let mut j = out_len;
+ out_len += 1;
+
+ while j > i {
+ out[j] = out[j - 1];
+ j -= 1;
+ }
+
+ // Insert the new character.
+ out[i] = c;
+
+ Ok(())
+ });
+ if r.is_ok() {
+ Some(f(&out[..out_len]))
+ } else {
+ None
+ }
+ }
+
+ /// Decode punycode as insertion positions and characters
+ /// and pass them to the closure, which can return `Err(())`
+ /// to stop the decoding process.
+ fn punycode_decode<F: FnMut(usize, char) -> Result<(), ()>>(
+ &self,
+ mut insert: F,
+ ) -> Result<(), ()> {
+ let mut punycode_bytes = self.punycode.bytes().peekable();
+ if punycode_bytes.peek().is_none() {
+ return Err(());
+ }
+
+ let mut len = 0;
+
+ // Populate initial output from ASCII fragment.
+ for c in self.ascii.chars() {
+ insert(len, c)?;
+ len += 1;
+ }
+
+ // Punycode parameters and initial state.
+ let base = 36;
+ let t_min = 1;
+ let t_max = 26;
+ let skew = 38;
+ let mut damp = 700;
+ let mut bias = 72;
+ let mut i: usize = 0;
+ let mut n: usize = 0x80;
+
+ loop {
+ // Read one delta value.
+ let mut delta: usize = 0;
+ let mut w = 1;
+ let mut k: usize = 0;
+ loop {
+ use core::cmp::{max, min};
+
+ k += base;
+ let t = min(max(k.saturating_sub(bias), t_min), t_max);
+
+ let d = match punycode_bytes.next() {
+ Some(d @ b'a'..=b'z') => d - b'a',
+ Some(d @ b'0'..=b'9') => 26 + (d - b'0'),
+ _ => return Err(()),
+ };
+ let d = d as usize;
+ delta = delta.checked_add(d.checked_mul(w).ok_or(())?).ok_or(())?;
+ if d < t {
+ break;
+ }
+ w = w.checked_mul(base - t).ok_or(())?;
+ }
+
+ // Compute the new insert position and character.
+ len += 1;
+ i = i.checked_add(delta).ok_or(())?;
+ n = n.checked_add(i / len).ok_or(())?;
+ i %= len;
+
+ let n_u32 = n as u32;
+ let c = if n_u32 as usize == n {
+ char::from_u32(n_u32).ok_or(())?
+ } else {
+ return Err(());
+ };
+
+ // Insert the new character and increment the insert position.
+ insert(i, c)?;
+ i += 1;
+
+ // If there are no more deltas, decoding is complete.
+ if punycode_bytes.peek().is_none() {
+ return Ok(());
+ }
+
+ // Perform bias adaptation.
+ delta /= damp;
+ damp = 2;
+
+ delta += delta / len;
+ let mut k = 0;
+ while delta > ((base - t_min) * t_max) / 2 {
+ delta /= base - t_min;
+ k += base;
+ }
+ bias = k + ((base - t_min + 1) * delta) / (delta + skew);
+ }
+ }
+}
+
+impl<'s> fmt::Display for Ident<'s> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ self.try_small_punycode_decode(|chars| {
+ for &c in chars {
+ c.fmt(f)?;
+ }
+ Ok(())
+ })
+ .unwrap_or_else(|| {
+ if !self.punycode.is_empty() {
+ f.write_str("punycode{")?;
+
+ // Reconstruct a standard Punycode encoding,
+ // by using `-` as the separator.
+ if !self.ascii.is_empty() {
+ f.write_str(self.ascii)?;
+ f.write_str("-")?;
+ }
+ f.write_str(self.punycode)?;
+
+ f.write_str("}")
+ } else {
+ f.write_str(self.ascii)
+ }
+ })
+ }
+}
+
+/// Sequence of lowercase hexadecimal nibbles (`0-9a-f`), used by leaf consts.
+struct HexNibbles<'s> {
+ nibbles: &'s str,
+}
+
+impl<'s> HexNibbles<'s> {
+ /// Decode an integer value (with the "most significant nibble" first),
+ /// returning `None` if it can't fit in an `u64`.
+ // FIXME(eddyb) should this "just" use `u128` instead?
+ fn try_parse_uint(&self) -> Option<u64> {
+ let nibbles = self.nibbles.trim_start_matches("0");
+
+ if nibbles.len() > 16 {
+ return None;
+ }
+
+ let mut v = 0;
+ for nibble in nibbles.chars() {
+ v = (v << 4) | (nibble.to_digit(16).unwrap() as u64);
+ }
+ Some(v)
+ }
+
+ /// Decode a UTF-8 byte sequence (with each byte using a pair of nibbles)
+ /// into individual `char`s, returning `None` for invalid UTF-8.
+ fn try_parse_str_chars(&self) -> Option<impl Iterator<Item = char> + 's> {
+ if self.nibbles.len() % 2 != 0 {
+ return None;
+ }
+
+ // FIXME(eddyb) use `array_chunks` instead, when that becomes stable.
+ let mut bytes = self
+ .nibbles
+ .as_bytes()
+ .chunks_exact(2)
+ .map(|slice| match slice {
+ [a, b] => [a, b],
+ _ => unreachable!(),
+ })
+ .map(|[&hi, &lo]| {
+ let half = |nibble: u8| (nibble as char).to_digit(16).unwrap() as u8;
+ (half(hi) << 4) | half(lo)
+ });
+
+ let chars = iter::from_fn(move || {
+ // As long as there are any bytes left, there's at least one more
+ // UTF-8-encoded `char` to decode (or the possibility of error).
+ bytes.next().map(|first_byte| -> Result<char, ()> {
+ // FIXME(eddyb) this `enum` and `fn` should be somewhere in `core`.
+ enum Utf8FirstByteError {
+ ContinuationByte,
+ TooLong,
+ }
+ fn utf8_len_from_first_byte(byte: u8) -> Result<usize, Utf8FirstByteError> {
+ match byte {
+ 0x00..=0x7f => Ok(1),
+ 0x80..=0xbf => Err(Utf8FirstByteError::ContinuationByte),
+ 0xc0..=0xdf => Ok(2),
+ 0xe0..=0xef => Ok(3),
+ 0xf0..=0xf7 => Ok(4),
+ 0xf8..=0xff => Err(Utf8FirstByteError::TooLong),
+ }
+ }
+
+ // Collect the appropriate amount of bytes (up to 4), according
+ // to the UTF-8 length implied by the first byte.
+ let utf8_len = utf8_len_from_first_byte(first_byte).map_err(|_| ())?;
+ let utf8 = &mut [first_byte, 0, 0, 0][..utf8_len];
+ for i in 1..utf8_len {
+ utf8[i] = bytes.next().ok_or(())?;
+ }
+
+ // Fully validate the UTF-8 sequence.
+ let s = str::from_utf8(utf8).map_err(|_| ())?;
+
+ // Since we included exactly one UTF-8 sequence, and validation
+ // succeeded, `str::chars` should return exactly one `char`.
+ let mut chars = s.chars();
+ match (chars.next(), chars.next()) {
+ (Some(c), None) => Ok(c),
+ _ => unreachable!(
+ "str::from_utf8({:?}) = {:?} was expected to have 1 char, \
+ but {} chars were found",
+ utf8,
+ s,
+ s.chars().count()
+ ),
+ }
+ })
+ });
+
+ // HACK(eddyb) doing a separate validation iteration like this might be
+ // wasteful, but it's easier to avoid starting to print a string literal
+ // in the first place, than to abort it mid-string.
+ if chars.clone().any(|r| r.is_err()) {
+ None
+ } else {
+ Some(chars.map(Result::unwrap))
+ }
+ }
+}
+
+fn basic_type(tag: u8) -> Option<&'static str> {
+ Some(match tag {
+ b'b' => "bool",
+ b'c' => "char",
+ b'e' => "str",
+ b'u' => "()",
+ b'a' => "i8",
+ b's' => "i16",
+ b'l' => "i32",
+ b'x' => "i64",
+ b'n' => "i128",
+ b'i' => "isize",
+ b'h' => "u8",
+ b't' => "u16",
+ b'm' => "u32",
+ b'y' => "u64",
+ b'o' => "u128",
+ b'j' => "usize",
+ b'f' => "f32",
+ b'd' => "f64",
+ b'z' => "!",
+ b'p' => "_",
+ b'v' => "...",
+
+ _ => return None,
+ })
+}
+
+struct Parser<'s> {
+ sym: &'s str,
+ next: usize,
+ depth: u32,
+}
+
+impl<'s> Parser<'s> {
+ fn push_depth(&mut self) -> Result<(), ParseError> {
+ self.depth += 1;
+ if self.depth > MAX_DEPTH {
+ Err(ParseError::RecursedTooDeep)
+ } else {
+ Ok(())
+ }
+ }
+
+ fn pop_depth(&mut self) {
+ self.depth -= 1;
+ }
+
+ fn peek(&self) -> Option<u8> {
+ self.sym.as_bytes().get(self.next).cloned()
+ }
+
+ fn eat(&mut self, b: u8) -> bool {
+ if self.peek() == Some(b) {
+ self.next += 1;
+ true
+ } else {
+ false
+ }
+ }
+
+ fn next(&mut self) -> Result<u8, ParseError> {
+ let b = self.peek().ok_or(ParseError::Invalid)?;
+ self.next += 1;
+ Ok(b)
+ }
+
+ fn hex_nibbles(&mut self) -> Result<HexNibbles<'s>, ParseError> {
+ let start = self.next;
+ loop {
+ match self.next()? {
+ b'0'..=b'9' | b'a'..=b'f' => {}
+ b'_' => break,
+ _ => return Err(ParseError::Invalid),
+ }
+ }
+ Ok(HexNibbles {
+ nibbles: &self.sym[start..self.next - 1],
+ })
+ }
+
+ fn digit_10(&mut self) -> Result<u8, ParseError> {
+ let d = match self.peek() {
+ Some(d @ b'0'..=b'9') => d - b'0',
+ _ => return Err(ParseError::Invalid),
+ };
+ self.next += 1;
+ Ok(d)
+ }
+
+ fn digit_62(&mut self) -> Result<u8, ParseError> {
+ let d = match self.peek() {
+ Some(d @ b'0'..=b'9') => d - b'0',
+ Some(d @ b'a'..=b'z') => 10 + (d - b'a'),
+ Some(d @ b'A'..=b'Z') => 10 + 26 + (d - b'A'),
+ _ => return Err(ParseError::Invalid),
+ };
+ self.next += 1;
+ Ok(d)
+ }
+
+ fn integer_62(&mut self) -> Result<u64, ParseError> {
+ if self.eat(b'_') {
+ return Ok(0);
+ }
+
+ let mut x: u64 = 0;
+ while !self.eat(b'_') {
+ let d = self.digit_62()? as u64;
+ x = x.checked_mul(62).ok_or(ParseError::Invalid)?;
+ x = x.checked_add(d).ok_or(ParseError::Invalid)?;
+ }
+ x.checked_add(1).ok_or(ParseError::Invalid)
+ }
+
+ fn opt_integer_62(&mut self, tag: u8) -> Result<u64, ParseError> {
+ if !self.eat(tag) {
+ return Ok(0);
+ }
+ self.integer_62()?.checked_add(1).ok_or(ParseError::Invalid)
+ }
+
+ fn disambiguator(&mut self) -> Result<u64, ParseError> {
+ self.opt_integer_62(b's')
+ }
+
+ fn namespace(&mut self) -> Result<Option<char>, ParseError> {
+ match self.next()? {
+ // Special namespaces, like closures and shims.
+ ns @ b'A'..=b'Z' => Ok(Some(ns as char)),
+
+ // Implementation-specific/unspecified namespaces.
+ b'a'..=b'z' => Ok(None),
+
+ _ => Err(ParseError::Invalid),
+ }
+ }
+
+ fn backref(&mut self) -> Result<Parser<'s>, ParseError> {
+ let s_start = self.next - 1;
+ let i = self.integer_62()?;
+ if i >= s_start as u64 {
+ return Err(ParseError::Invalid);
+ }
+ let mut new_parser = Parser {
+ sym: self.sym,
+ next: i as usize,
+ depth: self.depth,
+ };
+ new_parser.push_depth()?;
+ Ok(new_parser)
+ }
+
+ fn ident(&mut self) -> Result<Ident<'s>, ParseError> {
+ let is_punycode = self.eat(b'u');
+ let mut len = self.digit_10()? as usize;
+ if len != 0 {
+ while let Ok(d) = self.digit_10() {
+ len = len.checked_mul(10).ok_or(ParseError::Invalid)?;
+ len = len.checked_add(d as usize).ok_or(ParseError::Invalid)?;
+ }
+ }
+
+ // Skip past the optional `_` separator.
+ self.eat(b'_');
+
+ let start = self.next;
+ self.next = self.next.checked_add(len).ok_or(ParseError::Invalid)?;
+ if self.next > self.sym.len() {
+ return Err(ParseError::Invalid);
+ }
+
+ let ident = &self.sym[start..self.next];
+
+ if is_punycode {
+ let ident = match ident.bytes().rposition(|b| b == b'_') {
+ Some(i) => Ident {
+ ascii: &ident[..i],
+ punycode: &ident[i + 1..],
+ },
+ None => Ident {
+ ascii: "",
+ punycode: ident,
+ },
+ };
+ if ident.punycode.is_empty() {
+ return Err(ParseError::Invalid);
+ }
+ Ok(ident)
+ } else {
+ Ok(Ident {
+ ascii: ident,
+ punycode: "",
+ })
+ }
+ }
+}
+
+struct Printer<'a, 'b: 'a, 's> {
+ /// The input parser to demangle from, or `Err` if any (parse) error was
+ /// encountered (in order to disallow further likely-incorrect demangling).
+ ///
+ /// See also the documentation on the `invalid!` and `parse!` macros below.
+ parser: Result<Parser<'s>, ParseError>,
+
+ /// The output formatter to demangle to, or `None` while skipping printing.
+ out: Option<&'a mut fmt::Formatter<'b>>,
+
+ /// Cumulative number of lifetimes bound by `for<...>` binders ('G'),
+ /// anywhere "around" the current entity (e.g. type) being demangled.
+ /// This value is not tracked while skipping printing, as it'd be unused.
+ ///
+ /// See also the documentation on the `Printer::in_binder` method.
+ bound_lifetime_depth: u32,
+}
+
+impl ParseError {
+ /// Snippet to print when the error is initially encountered.
+ fn message(&self) -> &str {
+ match self {
+ ParseError::Invalid => "{invalid syntax}",
+ ParseError::RecursedTooDeep => "{recursion limit reached}",
+ }
+ }
+}
+
+/// Mark the parser as errored (with `ParseError::Invalid`), print the
+/// appropriate message (see `ParseError::message`) and return early.
+macro_rules! invalid {
+ ($printer:ident) => {{
+ let err = ParseError::Invalid;
+ $printer.print(err.message())?;
+ $printer.parser = Err(err);
+ return Ok(());
+ }};
+}
+
+/// Call a parser method (if the parser hasn't errored yet),
+/// and mark the parser as errored if it returns `Err`.
+///
+/// If the parser errored, before or now, this returns early,
+/// from the current function, after printing either:
+/// * for a new error, the appropriate message (see `ParseError::message`)
+/// * for an earlier error, only `?` - this allows callers to keep printing
+/// the approximate syntax of the path/type/const, despite having errors,
+/// e.g. `Vec<[(A, ?); ?]>` instead of `Vec<[(A, ?`
+macro_rules! parse {
+ ($printer:ident, $method:ident $(($($arg:expr),*))*) => {
+ match $printer.parser {
+ Ok(ref mut parser) => match parser.$method($($($arg),*)*) {
+ Ok(x) => x,
+ Err(err) => {
+ $printer.print(err.message())?;
+ $printer.parser = Err(err);
+ return Ok(());
+ }
+ }
+ Err(_) => return $printer.print("?"),
+ }
+ };
+}
+
+impl<'a, 'b, 's> Printer<'a, 'b, 's> {
+ /// Eat the given character from the parser,
+ /// returning `false` if the parser errored.
+ fn eat(&mut self, b: u8) -> bool {
+ self.parser.as_mut().map(|p| p.eat(b)) == Ok(true)
+ }
+
+ /// Skip printing (i.e. `self.out` will be `None`) for the duration of the
+ /// given closure. This should not change parsing behavior, only disable the
+ /// output, but there may be optimizations (such as not traversing backrefs).
+ fn skipping_printing<F>(&mut self, f: F)
+ where
+ F: FnOnce(&mut Self) -> fmt::Result,
+ {
+ let orig_out = self.out.take();
+ f(self).expect("`fmt::Error`s should be impossible without a `fmt::Formatter`");
+ self.out = orig_out;
+ }
+
+ /// Print the target of a backref, using the given closure.
+ /// When printing is being skipped, the backref will only be parsed,
+ /// ignoring the backref's target completely.
+ fn print_backref<F>(&mut self, f: F) -> fmt::Result
+ where
+ F: FnOnce(&mut Self) -> fmt::Result,
+ {
+ let backref_parser = parse!(self, backref);
+
+ if self.out.is_none() {
+ return Ok(());
+ }
+
+ let orig_parser = mem::replace(&mut self.parser, Ok(backref_parser));
+ let r = f(self);
+ self.parser = orig_parser;
+ r
+ }
+
+ fn pop_depth(&mut self) {
+ if let Ok(ref mut parser) = self.parser {
+ parser.pop_depth();
+ }
+ }
+
+ /// Output the given value to `self.out` (using `fmt::Display` formatting),
+ /// if printing isn't being skipped.
+ fn print(&mut self, x: impl fmt::Display) -> fmt::Result {
+ if let Some(out) = &mut self.out {
+ fmt::Display::fmt(&x, out)?;
+ }
+ Ok(())
+ }
+
+ /// Output the given `char`s (escaped using `char::escape_debug`), with the
+ /// whole sequence wrapped in quotes, for either a `char` or `&str` literal,
+ /// if printing isn't being skipped.
+ fn print_quoted_escaped_chars(
+ &mut self,
+ quote: char,
+ chars: impl Iterator<Item = char>,
+ ) -> fmt::Result {
+ if let Some(out) = &mut self.out {
+ use core::fmt::Write;
+
+ out.write_char(quote)?;
+ for c in chars {
+ // Special-case not escaping a single/double quote, when
+ // inside the opposite kind of quote.
+ if matches!((quote, c), ('\'', '"') | ('"', '\'')) {
+ out.write_char(c)?;
+ continue;
+ }
+
+ for escaped in c.escape_debug() {
+ out.write_char(escaped)?;
+ }
+ }
+ out.write_char(quote)?;
+ }
+ Ok(())
+ }
+
+ /// Print the lifetime according to the previously decoded index.
+ /// An index of `0` always refers to `'_`, but starting with `1`,
+ /// indices refer to late-bound lifetimes introduced by a binder.
+ fn print_lifetime_from_index(&mut self, lt: u64) -> fmt::Result {
+ // Bound lifetimes aren't tracked when skipping printing.
+ if self.out.is_none() {
+ return Ok(());
+ }
+
+ self.print("'")?;
+ if lt == 0 {
+ return self.print("_");
+ }
+ match (self.bound_lifetime_depth as u64).checked_sub(lt) {
+ Some(depth) => {
+ // Try to print lifetimes alphabetically first.
+ if depth < 26 {
+ let c = (b'a' + depth as u8) as char;
+ self.print(c)
+ } else {
+ // Use `'_123` after running out of letters.
+ self.print("_")?;
+ self.print(depth)
+ }
+ }
+ None => invalid!(self),
+ }
+ }
+
+ /// Optionally enter a binder ('G') for late-bound lifetimes,
+ /// printing e.g. `for<'a, 'b> ` before calling the closure,
+ /// and make those lifetimes visible to it (via depth level).
+ fn in_binder<F>(&mut self, f: F) -> fmt::Result
+ where
+ F: FnOnce(&mut Self) -> fmt::Result,
+ {
+ let bound_lifetimes = parse!(self, opt_integer_62(b'G'));
+
+ // Don't track bound lifetimes when skipping printing.
+ if self.out.is_none() {
+ return f(self);
+ }
+
+ if bound_lifetimes > 0 {
+ self.print("for<")?;
+ for i in 0..bound_lifetimes {
+ if i > 0 {
+ self.print(", ")?;
+ }
+ self.bound_lifetime_depth += 1;
+ self.print_lifetime_from_index(1)?;
+ }
+ self.print("> ")?;
+ }
+
+ let r = f(self);
+
+ // Restore `bound_lifetime_depth` to the previous value.
+ self.bound_lifetime_depth -= bound_lifetimes as u32;
+
+ r
+ }
+
+ /// Print list elements using the given closure and separator,
+ /// until the end of the list ('E') is found, or the parser errors.
+ /// Returns the number of elements printed.
+ fn print_sep_list<F>(&mut self, f: F, sep: &str) -> Result<usize, fmt::Error>
+ where
+ F: Fn(&mut Self) -> fmt::Result,
+ {
+ let mut i = 0;
+ while self.parser.is_ok() && !self.eat(b'E') {
+ if i > 0 {
+ self.print(sep)?;
+ }
+ f(self)?;
+ i += 1;
+ }
+ Ok(i)
+ }
+
+ fn print_path(&mut self, in_value: bool) -> fmt::Result {
+ parse!(self, push_depth);
+
+ let tag = parse!(self, next);
+ match tag {
+ b'C' => {
+ let dis = parse!(self, disambiguator);
+ let name = parse!(self, ident);
+
+ self.print(name)?;
+ if let Some(out) = &mut self.out {
+ if !out.alternate() {
+ out.write_str("[")?;
+ fmt::LowerHex::fmt(&dis, out)?;
+ out.write_str("]")?;
+ }
+ }
+ }
+ b'N' => {
+ let ns = parse!(self, namespace);
+
+ self.print_path(in_value)?;
+
+ // HACK(eddyb) if the parser is already marked as having errored,
+ // `parse!` below will print a `?` without its preceding `::`
+ // (because printing the `::` is skipped in certain conditions,
+ // i.e. a lowercase namespace with an empty identifier),
+ // so in order to get `::?`, the `::` has to be printed here.
+ if self.parser.is_err() {
+ self.print("::")?;
+ }
+
+ let dis = parse!(self, disambiguator);
+ let name = parse!(self, ident);
+
+ match ns {
+ // Special namespaces, like closures and shims.
+ Some(ns) => {
+ self.print("::{")?;
+ match ns {
+ 'C' => self.print("closure")?,
+ 'S' => self.print("shim")?,
+ _ => self.print(ns)?,
+ }
+ if !name.ascii.is_empty() || !name.punycode.is_empty() {
+ self.print(":")?;
+ self.print(name)?;
+ }
+ self.print("#")?;
+ self.print(dis)?;
+ self.print("}")?;
+ }
+
+ // Implementation-specific/unspecified namespaces.
+ None => {
+ if !name.ascii.is_empty() || !name.punycode.is_empty() {
+ self.print("::")?;
+ self.print(name)?;
+ }
+ }
+ }
+ }
+ b'M' | b'X' | b'Y' => {
+ if tag != b'Y' {
+ // Ignore the `impl`'s own path.
+ parse!(self, disambiguator);
+ self.skipping_printing(|this| this.print_path(false));
+ }
+
+ self.print("<")?;
+ self.print_type()?;
+ if tag != b'M' {
+ self.print(" as ")?;
+ self.print_path(false)?;
+ }
+ self.print(">")?;
+ }
+ b'I' => {
+ self.print_path(in_value)?;
+ if in_value {
+ self.print("::")?;
+ }
+ self.print("<")?;
+ self.print_sep_list(Self::print_generic_arg, ", ")?;
+ self.print(">")?;
+ }
+ b'B' => {
+ self.print_backref(|this| this.print_path(in_value))?;
+ }
+ _ => invalid!(self),
+ }
+
+ self.pop_depth();
+ Ok(())
+ }
+
+ fn print_generic_arg(&mut self) -> fmt::Result {
+ if self.eat(b'L') {
+ let lt = parse!(self, integer_62);
+ self.print_lifetime_from_index(lt)
+ } else if self.eat(b'K') {
+ self.print_const(false)
+ } else {
+ self.print_type()
+ }
+ }
+
+ fn print_type(&mut self) -> fmt::Result {
+ let tag = parse!(self, next);
+
+ if let Some(ty) = basic_type(tag) {
+ return self.print(ty);
+ }
+
+ parse!(self, push_depth);
+
+ match tag {
+ b'R' | b'Q' => {
+ self.print("&")?;
+ if self.eat(b'L') {
+ let lt = parse!(self, integer_62);
+ if lt != 0 {
+ self.print_lifetime_from_index(lt)?;
+ self.print(" ")?;
+ }
+ }
+ if tag != b'R' {
+ self.print("mut ")?;
+ }
+ self.print_type()?;
+ }
+
+ b'P' | b'O' => {
+ self.print("*")?;
+ if tag != b'P' {
+ self.print("mut ")?;
+ } else {
+ self.print("const ")?;
+ }
+ self.print_type()?;
+ }
+
+ b'A' | b'S' => {
+ self.print("[")?;
+ self.print_type()?;
+ if tag == b'A' {
+ self.print("; ")?;
+ self.print_const(true)?;
+ }
+ self.print("]")?;
+ }
+ b'T' => {
+ self.print("(")?;
+ let count = self.print_sep_list(Self::print_type, ", ")?;
+ if count == 1 {
+ self.print(",")?;
+ }
+ self.print(")")?;
+ }
+ b'F' => self.in_binder(|this| {
+ let is_unsafe = this.eat(b'U');
+ let abi = if this.eat(b'K') {
+ if this.eat(b'C') {
+ Some("C")
+ } else {
+ let abi = parse!(this, ident);
+ if abi.ascii.is_empty() || !abi.punycode.is_empty() {
+ invalid!(this);
+ }
+ Some(abi.ascii)
+ }
+ } else {
+ None
+ };
+
+ if is_unsafe {
+ this.print("unsafe ")?;
+ }
+
+ if let Some(abi) = abi {
+ this.print("extern \"")?;
+
+ // If the ABI had any `-`, they were replaced with `_`,
+ // so the parts between `_` have to be re-joined with `-`.
+ let mut parts = abi.split('_');
+ this.print(parts.next().unwrap())?;
+ for part in parts {
+ this.print("-")?;
+ this.print(part)?;
+ }
+
+ this.print("\" ")?;
+ }
+
+ this.print("fn(")?;
+ this.print_sep_list(Self::print_type, ", ")?;
+ this.print(")")?;
+
+ if this.eat(b'u') {
+ // Skip printing the return type if it's 'u', i.e. `()`.
+ } else {
+ this.print(" -> ")?;
+ this.print_type()?;
+ }
+
+ Ok(())
+ })?,
+ b'D' => {
+ self.print("dyn ")?;
+ self.in_binder(|this| {
+ this.print_sep_list(Self::print_dyn_trait, " + ")?;
+ Ok(())
+ })?;
+
+ if !self.eat(b'L') {
+ invalid!(self);
+ }
+ let lt = parse!(self, integer_62);
+ if lt != 0 {
+ self.print(" + ")?;
+ self.print_lifetime_from_index(lt)?;
+ }
+ }
+ b'B' => {
+ self.print_backref(Self::print_type)?;
+ }
+ _ => {
+ // Go back to the tag, so `print_path` also sees it.
+ let _ = self.parser.as_mut().map(|p| p.next -= 1);
+ self.print_path(false)?;
+ }
+ }
+
+ self.pop_depth();
+ Ok(())
+ }
+
+ /// A trait in a trait object may have some "existential projections"
+ /// (i.e. associated type bindings) after it, which should be printed
+ /// in the `<...>` of the trait, e.g. `dyn Trait<T, U, Assoc=X>`.
+ /// To this end, this method will keep the `<...>` of an 'I' path
+ /// open, by omitting the `>`, and return `Ok(true)` in that case.
+ fn print_path_maybe_open_generics(&mut self) -> Result<bool, fmt::Error> {
+ if self.eat(b'B') {
+ // NOTE(eddyb) the closure may not run if printing is being skipped,
+ // but in that case the returned boolean doesn't matter.
+ let mut open = false;
+ self.print_backref(|this| {
+ open = this.print_path_maybe_open_generics()?;
+ Ok(())
+ })?;
+ Ok(open)
+ } else if self.eat(b'I') {
+ self.print_path(false)?;
+ self.print("<")?;
+ self.print_sep_list(Self::print_generic_arg, ", ")?;
+ Ok(true)
+ } else {
+ self.print_path(false)?;
+ Ok(false)
+ }
+ }
+
+ fn print_dyn_trait(&mut self) -> fmt::Result {
+ let mut open = self.print_path_maybe_open_generics()?;
+
+ while self.eat(b'p') {
+ if !open {
+ self.print("<")?;
+ open = true;
+ } else {
+ self.print(", ")?;
+ }
+
+ let name = parse!(self, ident);
+ self.print(name)?;
+ self.print(" = ")?;
+ self.print_type()?;
+ }
+
+ if open {
+ self.print(">")?;
+ }
+
+ Ok(())
+ }
+
+ fn print_const(&mut self, in_value: bool) -> fmt::Result {
+ let tag = parse!(self, next);
+
+ parse!(self, push_depth);
+
+ // Only literals (and the names of `const` generic parameters, but they
+ // don't get mangled at all), can appear in generic argument position
+ // without any disambiguation, all other expressions require braces.
+ // To avoid duplicating the mapping between `tag` and what syntax gets
+ // used (especially any special-casing), every case that needs braces
+ // has to call `open_brace(self)?` (and the closing brace is automatic).
+ let mut opened_brace = false;
+ let mut open_brace_if_outside_expr = |this: &mut Self| {
+ // If this expression is nested in another, braces aren't required.
+ if in_value {
+ return Ok(());
+ }
+
+ opened_brace = true;
+ this.print("{")
+ };
+
+ match tag {
+ b'p' => self.print("_")?,
+
+ // Primitive leaves with hex-encoded values (see `basic_type`).
+ b'h' | b't' | b'm' | b'y' | b'o' | b'j' => self.print_const_uint(tag)?,
+ b'a' | b's' | b'l' | b'x' | b'n' | b'i' => {
+ if self.eat(b'n') {
+ self.print("-")?;
+ }
+
+ self.print_const_uint(tag)?;
+ }
+ b'b' => match parse!(self, hex_nibbles).try_parse_uint() {
+ Some(0) => self.print("false")?,
+ Some(1) => self.print("true")?,
+ _ => invalid!(self),
+ },
+ b'c' => {
+ let valid_char = parse!(self, hex_nibbles)
+ .try_parse_uint()
+ .and_then(|v| u32::try_from(v).ok())
+ .and_then(char::from_u32);
+ match valid_char {
+ Some(c) => self.print_quoted_escaped_chars('\'', iter::once(c))?,
+ None => invalid!(self),
+ }
+ }
+ b'e' => {
+ // NOTE(eddyb) a string literal `"..."` has type `&str`, so
+ // to get back the type `str`, `*"..."` syntax is needed
+ // (even if that may not be valid in Rust itself).
+ open_brace_if_outside_expr(self)?;
+ self.print("*")?;
+
+ self.print_const_str_literal()?;
+ }
+
+ b'R' | b'Q' => {
+ // NOTE(eddyb) this prints `"..."` instead of `&*"..."`, which
+ // is what `Re..._` would imply (see comment for `str` above).
+ if tag == b'R' && self.eat(b'e') {
+ self.print_const_str_literal()?;
+ } else {
+ open_brace_if_outside_expr(self)?;
+ self.print("&")?;
+ if tag != b'R' {
+ self.print("mut ")?;
+ }
+ self.print_const(true)?;
+ }
+ }
+ b'A' => {
+ open_brace_if_outside_expr(self)?;
+ self.print("[")?;
+ self.print_sep_list(|this| this.print_const(true), ", ")?;
+ self.print("]")?;
+ }
+ b'T' => {
+ open_brace_if_outside_expr(self)?;
+ self.print("(")?;
+ let count = self.print_sep_list(|this| this.print_const(true), ", ")?;
+ if count == 1 {
+ self.print(",")?;
+ }
+ self.print(")")?;
+ }
+ b'V' => {
+ open_brace_if_outside_expr(self)?;
+ self.print_path(true)?;
+ match parse!(self, next) {
+ b'U' => {}
+ b'T' => {
+ self.print("(")?;
+ self.print_sep_list(|this| this.print_const(true), ", ")?;
+ self.print(")")?;
+ }
+ b'S' => {
+ self.print(" { ")?;
+ self.print_sep_list(
+ |this| {
+ parse!(this, disambiguator);
+ let name = parse!(this, ident);
+ this.print(name)?;
+ this.print(": ")?;
+ this.print_const(true)
+ },
+ ", ",
+ )?;
+ self.print(" }")?;
+ }
+ _ => invalid!(self),
+ }
+ }
+ b'B' => {
+ self.print_backref(|this| this.print_const(in_value))?;
+ }
+ _ => invalid!(self),
+ }
+
+ if opened_brace {
+ self.print("}")?;
+ }
+
+ self.pop_depth();
+ Ok(())
+ }
+
+ fn print_const_uint(&mut self, ty_tag: u8) -> fmt::Result {
+ let hex = parse!(self, hex_nibbles);
+
+ match hex.try_parse_uint() {
+ Some(v) => self.print(v)?,
+
+ // Print anything that doesn't fit in `u64` verbatim.
+ None => {
+ self.print("0x")?;
+ self.print(hex.nibbles)?;
+ }
+ }
+
+ if let Some(out) = &mut self.out {
+ if !out.alternate() {
+ let ty = basic_type(ty_tag).unwrap();
+ self.print(ty)?;
+ }
+ }
+
+ Ok(())
+ }
+
+ fn print_const_str_literal(&mut self) -> fmt::Result {
+ match parse!(self, hex_nibbles).try_parse_str_chars() {
+ Some(chars) => self.print_quoted_escaped_chars('"', chars),
+ None => invalid!(self),
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use std::prelude::v1::*;
+
+ macro_rules! t {
+ ($a:expr, $b:expr) => {{
+ assert_eq!(format!("{}", ::demangle($a)), $b);
+ }};
+ }
+ macro_rules! t_nohash {
+ ($a:expr, $b:expr) => {{
+ assert_eq!(format!("{:#}", ::demangle($a)), $b);
+ }};
+ }
+ macro_rules! t_nohash_type {
+ ($a:expr, $b:expr) => {
+ t_nohash!(concat!("_RMC0", $a), concat!("<", $b, ">"))
+ };
+ }
+ macro_rules! t_const {
+ ($mangled:expr, $value:expr) => {
+ t_nohash!(
+ concat!("_RIC0K", $mangled, "E"),
+ concat!("::<", $value, ">")
+ )
+ };
+ }
+ macro_rules! t_const_suffixed {
+ ($mangled:expr, $value:expr, $value_ty_suffix:expr) => {{
+ t_const!($mangled, $value);
+ t!(
+ concat!("_RIC0K", $mangled, "E"),
+ concat!("[0]::<", $value, $value_ty_suffix, ">")
+ );
+ }};
+ }
+
+ #[test]
+ fn demangle_crate_with_leading_digit() {
+ t_nohash!("_RNvC6_123foo3bar", "123foo::bar");
+ }
+
+ #[test]
+ fn demangle_utf8_idents() {
+ t_nohash!(
+ "_RNqCs4fqI2P2rA04_11utf8_identsu30____7hkackfecea1cbdathfdh9hlq6y",
+ "utf8_idents::საჭმელად_გემრიელი_სადილი"
+ );
+ }
+
+ #[test]
+ fn demangle_closure() {
+ t_nohash!(
+ "_RNCNCNgCs6DXkGYLi8lr_2cc5spawn00B5_",
+ "cc::spawn::{closure#0}::{closure#0}"
+ );
+ t_nohash!(
+ "_RNCINkXs25_NgCsbmNqQUJIY6D_4core5sliceINyB9_4IterhENuNgNoBb_4iter8iterator8Iterator9rpositionNCNgNpB9_6memchr7memrchrs_0E0Bb_",
+ "<core::slice::Iter<u8> as core::iter::iterator::Iterator>::rposition::<core::slice::memchr::memrchr::{closure#1}>::{closure#0}"
+ );
+ }
+
+ #[test]
+ fn demangle_dyn_trait() {
+ t_nohash!(
+ "_RINbNbCskIICzLVDPPb_5alloc5alloc8box_freeDINbNiB4_5boxed5FnBoxuEp6OutputuEL_ECs1iopQbuBiw2_3std",
+ "alloc::alloc::box_free::<dyn alloc::boxed::FnBox<(), Output = ()>>"
+ );
+ }
+
+ #[test]
+ fn demangle_const_generics_preview() {
+ // NOTE(eddyb) this was hand-written, before rustc had working
+ // const generics support (but the mangling format did include them).
+ t_nohash_type!(
+ "INtC8arrayvec8ArrayVechKj7b_E",
+ "arrayvec::ArrayVec<u8, 123>"
+ );
+ t_const_suffixed!("j7b_", "123", "usize");
+ }
+
+ #[test]
+ fn demangle_min_const_generics() {
+ t_const!("p", "_");
+ t_const_suffixed!("hb_", "11", "u8");
+ t_const_suffixed!("off00ff00ff00ff00ff_", "0xff00ff00ff00ff00ff", "u128");
+ t_const_suffixed!("s98_", "152", "i16");
+ t_const_suffixed!("anb_", "-11", "i8");
+ t_const!("b0_", "false");
+ t_const!("b1_", "true");
+ t_const!("c76_", "'v'");
+ t_const!("c22_", r#"'"'"#);
+ t_const!("ca_", "'\\n'");
+ t_const!("c2202_", "'∂'");
+ }
+
+ #[test]
+ fn demangle_const_str() {
+ t_const!("e616263_", "{*\"abc\"}");
+ t_const!("e27_", r#"{*"'"}"#);
+ t_const!("e090a_", "{*\"\\t\\n\"}");
+ t_const!("ee28882c3bc_", "{*\"∂ü\"}");
+ t_const!(
+ "ee183a1e18390e183ade1839be18394e1839ae18390e183935fe18392e18394e1839b\
+ e183a0e18398e18394e1839ae183985fe183a1e18390e18393e18398e1839ae18398_",
+ "{*\"საჭმელად_გემრიელი_სადილი\"}"
+ );
+ t_const!(
+ "ef09f908af09fa688f09fa686f09f90ae20c2a720f09f90b6f09f9192e298\
+ 95f09f94a520c2a720f09fa7a1f09f929bf09f929af09f9299f09f929c_",
+ "{*\"🐊🦈🦆🐮 § 🐶👒☕🔥 § 🧡💛💚💙💜\"}"
+ );
+ }
+
+ // NOTE(eddyb) this uses the same strings as `demangle_const_str` and should
+ // be kept in sync with it - while a macro could be used to generate both
+ // `str` and `&str` tests, from a single list of strings, this seems clearer.
+ #[test]
+ fn demangle_const_ref_str() {
+ t_const!("Re616263_", "\"abc\"");
+ t_const!("Re27_", r#""'""#);
+ t_const!("Re090a_", "\"\\t\\n\"");
+ t_const!("Ree28882c3bc_", "\"∂ü\"");
+ t_const!(
+ "Ree183a1e18390e183ade1839be18394e1839ae18390e183935fe18392e18394e1839b\
+ e183a0e18398e18394e1839ae183985fe183a1e18390e18393e18398e1839ae18398_",
+ "\"საჭმელად_გემრიელი_სადილი\""
+ );
+ t_const!(
+ "Ref09f908af09fa688f09fa686f09f90ae20c2a720f09f90b6f09f9192e298\
+ 95f09f94a520c2a720f09fa7a1f09f929bf09f929af09f9299f09f929c_",
+ "\"🐊🦈🦆🐮 § 🐶👒☕🔥 § 🧡💛💚💙💜\""
+ );
+ }
+
+ #[test]
+ fn demangle_const_ref() {
+ t_const!("Rp", "{&_}");
+ t_const!("Rh7b_", "{&123}");
+ t_const!("Rb0_", "{&false}");
+ t_const!("Rc58_", "{&'X'}");
+ t_const!("RRRh0_", "{&&&0}");
+ t_const!("RRRe_", "{&&\"\"}");
+ t_const!("QAE", "{&mut []}");
+ }
+
+ #[test]
+ fn demangle_const_array() {
+ t_const!("AE", "{[]}");
+ t_const!("Aj0_E", "{[0]}");
+ t_const!("Ah1_h2_h3_E", "{[1, 2, 3]}");
+ t_const!("ARe61_Re62_Re63_E", "{[\"a\", \"b\", \"c\"]}");
+ t_const!("AAh1_h2_EAh3_h4_EE", "{[[1, 2], [3, 4]]}");
+ }
+
+ #[test]
+ fn demangle_const_tuple() {
+ t_const!("TE", "{()}");
+ t_const!("Tj0_E", "{(0,)}");
+ t_const!("Th1_b0_E", "{(1, false)}");
+ t_const!(
+ "TRe616263_c78_RAh1_h2_h3_EE",
+ "{(\"abc\", 'x', &[1, 2, 3])}"
+ );
+ }
+
+ #[test]
+ fn demangle_const_adt() {
+ t_const!(
+ "VNvINtNtC4core6option6OptionjE4NoneU",
+ "{core::option::Option::<usize>::None}"
+ );
+ t_const!(
+ "VNvINtNtC4core6option6OptionjE4SomeTj0_E",
+ "{core::option::Option::<usize>::Some(0)}"
+ );
+ t_const!(
+ "VNtC3foo3BarS1sRe616263_2chc78_5sliceRAh1_h2_h3_EE",
+ "{foo::Bar { s: \"abc\", ch: 'x', slice: &[1, 2, 3] }}"
+ );
+ }
+
+ #[test]
+ fn demangle_exponential_explosion() {
+ // NOTE(eddyb) because of the prefix added by `t_nohash_type!` is
+ // 3 bytes long, `B2_` refers to the start of the type, not `B_`.
+ // 6 backrefs (`B8_E` through `B3_E`) result in 2^6 = 64 copies of `_`.
+ // Also, because the `p` (`_`) type is after all of the starts of the
+ // backrefs, it can be replaced with any other type, independently.
+ t_nohash_type!(
+ concat!("TTTTTT", "p", "B8_E", "B7_E", "B6_E", "B5_E", "B4_E", "B3_E"),
+ "((((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _)))), \
+ ((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _))))), \
+ (((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _)))), \
+ ((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _))))))"
+ );
+ }
+
+ #[test]
+ fn demangle_thinlto() {
+ t_nohash!("_RC3foo.llvm.9D1C9369", "foo");
+ t_nohash!("_RC3foo.llvm.9D1C9369@@16", "foo");
+ t_nohash!("_RNvC9backtrace3foo.llvm.A5310EB9", "backtrace::foo");
+ }
+
+ #[test]
+ fn demangle_extra_suffix() {
+ // From alexcrichton/rustc-demangle#27:
+ t_nohash!(
+ "_RNvNtNtNtNtCs92dm3009vxr_4rand4rngs7adapter9reseeding4fork23FORK_HANDLER_REGISTERED.0.0",
+ "rand::rngs::adapter::reseeding::fork::FORK_HANDLER_REGISTERED.0.0"
+ );
+ }
+
+ #[test]
+ fn demangling_limits() {
+ // Stress tests found via fuzzing.
+
+ for sym in include_str!("v0-large-test-symbols/early-recursion-limit")
+ .lines()
+ .filter(|line| !line.is_empty() && !line.starts_with('#'))
+ {
+ assert_eq!(
+ super::demangle(sym).map(|_| ()),
+ Err(super::ParseError::RecursedTooDeep)
+ );
+ }
+
+ assert_contains!(
+ ::demangle(
+ "RIC20tRYIMYNRYFG05_EB5_B_B6_RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR\
+ RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRB_E",
+ )
+ .to_string(),
+ "{recursion limit reached}"
+ );
+ }
+
+ #[test]
+ fn recursion_limit_leaks() {
+ // NOTE(eddyb) this test checks that both paths and types support the
+ // recursion limit correctly, i.e. matching `push_depth` and `pop_depth`,
+ // and don't leak "recursion levels" and trip the limit.
+ // The test inputs are generated on the fly, using a repeated pattern,
+ // as hardcoding the actual strings would be too verbose.
+ // Also, `MAX_DEPTH` can be directly used, instead of assuming its value.
+ for &(sym_leaf, expected_leaf) in &[("p", "_"), ("Rp", "&_"), ("C1x", "x")] {
+ let mut sym = format!("_RIC0p");
+ let mut expected = format!("::<_");
+ for _ in 0..(super::MAX_DEPTH * 2) {
+ sym.push_str(sym_leaf);
+ expected.push_str(", ");
+ expected.push_str(expected_leaf);
+ }
+ sym.push('E');
+ expected.push('>');
+
+ t_nohash!(&sym, expected);
+ }
+ }
+
+ #[test]
+ fn recursion_limit_backref_free_bypass() {
+ // NOTE(eddyb) this test checks that long symbols cannot bypass the
+ // recursion limit by not using backrefs, and cause a stack overflow.
+
+ // This value was chosen to be high enough that stack overflows were
+ // observed even with `cargo test --release`.
+ let depth = 100_000;
+
+ // In order to hide the long mangling from the initial "shallow" parse,
+ // it's nested in an identifier (crate name), preceding its use.
+ let mut sym = format!("_RIC{}", depth);
+ let backref_start = sym.len() - 2;
+ for _ in 0..depth {
+ sym.push('R');
+ }
+
+ // Write a backref to just after the length of the identifier.
+ sym.push('B');
+ sym.push(char::from_digit((backref_start - 1) as u32, 36).unwrap());
+ sym.push('_');
+
+ // Close the `I` at the start.
+ sym.push('E');
+
+ assert_contains!(::demangle(&sym).to_string(), "{recursion limit reached}");
+ }
+}