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Diffstat (limited to 'vendor/rustc-demangle')
| -rw-r--r-- | vendor/rustc-demangle/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | vendor/rustc-demangle/Cargo.toml | 49 | ||||
| -rw-r--r-- | vendor/rustc-demangle/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | vendor/rustc-demangle/LICENSE-MIT | 25 | ||||
| -rw-r--r-- | vendor/rustc-demangle/README.md | 48 | ||||
| -rw-r--r-- | vendor/rustc-demangle/src/legacy.rs | 392 | ||||
| -rw-r--r-- | vendor/rustc-demangle/src/lib.rs | 588 | ||||
| -rw-r--r-- | vendor/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit | 10 | ||||
| -rw-r--r-- | vendor/rustc-demangle/src/v0.rs | 1530 |
9 files changed, 2844 insertions, 0 deletions
diff --git a/vendor/rustc-demangle/.cargo-checksum.json b/vendor/rustc-demangle/.cargo-checksum.json new file mode 100644 index 0000000..9ddcdb2 --- /dev/null +++ b/vendor/rustc-demangle/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"f4132bc65d5e58e2f27b9f9ef197b1c286582137b65285292b75a5a230fc81c8","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"378f5840b258e2779c39418f3f2d7b2ba96f1c7917dd6be0713f88305dbda397","README.md":"3bb7af78423e95b207beebd452cdd973d65663cf25a0fc9358c588f53783293c","src/legacy.rs":"b4d5a140ed0bf2d792431961d6fd44a21c99235489a2c9f6717d1577a42c09ce","src/lib.rs":"607fe60c1e65da3f86a0b4b8fececb7db79049a0cd4cb316492e8e6593bf39c6","src/v0-large-test-symbols/early-recursion-limit":"96861a7042db35ee0bd04802820d0f2d6a3b534ce13547912b6364001ffd1494","src/v0.rs":"4e5bd069aa61def3dc732b3a285861914895272668ddfcb6b9eef46dd5713041"},"package":"d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"}
\ No newline at end of file diff --git a/vendor/rustc-demangle/Cargo.toml b/vendor/rustc-demangle/Cargo.toml new file mode 100644 index 0000000..61238e3 --- /dev/null +++ b/vendor/rustc-demangle/Cargo.toml @@ -0,0 +1,49 @@ +# 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 are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +name = "rustc-demangle" +version = "0.1.23" +authors = ["Alex Crichton <alex@alexcrichton.com>"] +description = """ +Rust compiler symbol demangling. +""" +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" + +[package.metadata.docs.rs] +features = ["std"] +rustdoc-args = [ + "--cfg", + "docsrs", +] + +[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", +] +std = [] diff --git a/vendor/rustc-demangle/LICENSE-APACHE b/vendor/rustc-demangle/LICENSE-APACHE new file mode 100644 index 0000000..16fe87b --- /dev/null +++ b/vendor/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. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + +Copyright [yyyy] [name of copyright owner] + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/vendor/rustc-demangle/LICENSE-MIT b/vendor/rustc-demangle/LICENSE-MIT new file mode 100644 index 0000000..39e0ed6 --- /dev/null +++ b/vendor/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/vendor/rustc-demangle/README.md b/vendor/rustc-demangle/README.md new file mode 100644 index 0000000..0833e1e --- /dev/null +++ b/vendor/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/vendor/rustc-demangle/src/legacy.rs b/vendor/rustc-demangle/src/legacy.rs new file mode 100644 index 0000000..d55f3a1 --- /dev/null +++ b/vendor/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$3foo17h059a991a004536adE", + "issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo" + ); + } +} diff --git a/vendor/rustc-demangle/src/lib.rs b/vendor/rustc-demangle/src/lib.rs new file mode 100644 index 0000000..cafec2f --- /dev/null +++ b/vendor/rustc-demangle/src/lib.rs @@ -0,0 +1,588 @@ +//! Demangle Rust compiler symbol names. +//! +//! This crate provides a `demangle` function which will return a `Demangle` +//! sentinel value that can be used to learn about the demangled version of a +//! symbol name. The demangled representation will be the same as the original +//! if it doesn't look like a mangled symbol name. +//! +//! `Demangle` can be formatted with the `Display` trait. The alternate +//! modifier (`#`) can be used to format the symbol name without the +//! trailing hash value. +//! +//! # Examples +//! +//! ``` +//! use rustc_demangle::demangle; +//! +//! assert_eq!(demangle("_ZN4testE").to_string(), "test"); +//! assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar"); +//! assert_eq!(demangle("foo").to_string(), "foo"); +//! // With hash +//! assert_eq!(format!("{}", demangle("_ZN3foo17h05af221e174051e9E")), "foo::h05af221e174051e9"); +//! // Without hash +//! assert_eq!(format!("{:#}", demangle("_ZN3foo17h05af221e174051e9E")), "foo"); +//! ``` + +#![no_std] +#![deny(missing_docs)] +#![cfg_attr(docsrs, feature(doc_cfg))] + +#[cfg(any(test, feature = "std"))] +#[macro_use] +extern crate std; + +// HACK(eddyb) helper macros for tests. +#[cfg(test)] +macro_rules! assert_contains { + ($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, + } +} + +#[cfg(feature = "std")] +fn demangle_line( + line: &str, + output: &mut impl std::io::Write, + include_hash: bool, +) -> std::io::Result<()> { + let mut head = 0; + while head < line.len() { + // Move to the next potential match + let next_head = match (line[head..].find("_ZN"), line[head..].find("_R")) { + (Some(idx), None) | (None, Some(idx)) => head + idx, + (Some(idx1), Some(idx2)) => head + idx1.min(idx2), + (None, None) => { + // No more matches... + line.len() + } + }; + output.write_all(line[head..next_head].as_bytes())?; + head = next_head; + // Find the non-matching character. + // + // If we do not find a character, then until the end of the line is the + // thing to demangle. + let match_end = line[head..] + .find(|ch: char| !(ch == '$' || ch == '.' || ch == '_' || ch.is_ascii_alphanumeric())) + .map(|idx| head + idx) + .unwrap_or(line.len()); + + let mangled = &line[head..match_end]; + head = head + mangled.len(); + if let Ok(demangled) = try_demangle(mangled) { + if include_hash { + write!(output, "{}", demangled)?; + } else { + write!(output, "{:#}", demangled)?; + } + } else { + output.write_all(mangled.as_bytes())?; + } + } + Ok(()) +} + +/// Process a stream of data from `input` into the provided `output`, demangling any symbols found +/// within. +/// +/// Note that the underlying implementation will perform many relatively small writes to the +/// output. If the output is expensive to write to (e.g., requires syscalls), consider using +/// `std::io::BufWriter`. +#[cfg(feature = "std")] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub fn demangle_stream<R: std::io::BufRead, W: std::io::Write>( + input: &mut R, + output: &mut W, + include_hash: bool, +) -> std::io::Result<()> { + let mut buf = std::string::String::new(); + // We read in lines to reduce the memory usage at any time. + // + // demangle_line is also more efficient with relatively small buffers as it will copy around + // trailing data during demangling. In the future we might directly stream to the output but at + // least right now that seems to be less efficient. + while input.read_line(&mut buf)? > 0 { + demangle_line(&buf, output, include_hash)?; + buf.clear(); + } + Ok(()) +} + +/// 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}" + ); + } + + #[cfg(feature = "std")] + fn demangle_str(input: &str) -> String { + let mut output = Vec::new(); + super::demangle_line(input, &mut output, false); + String::from_utf8(output).unwrap() + } + + #[test] + #[cfg(feature = "std")] + fn find_multiple() { + assert_eq!( + demangle_str("_ZN3fooE.llvm moocow _ZN3fooE.llvm"), + "foo.llvm moocow foo.llvm" + ); + } + + #[test] + #[cfg(feature = "std")] + fn interleaved_new_legacy() { + assert_eq!( + demangle_str("_ZN3fooE.llvm moocow _RNvMNtNtNtNtCs8a2262Dv4r_3mio3sys4unix8selector5epollNtB2_8Selector6select _ZN3fooE.llvm"), + "foo.llvm moocow <mio::sys::unix::selector::epoll::Selector>::select foo.llvm" + ); + } +} diff --git a/vendor/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit b/vendor/rustc-demangle/src/v0-large-test-symbols/early-recursion-limit new file mode 100644 index 0000000..914d416 --- /dev/null +++ b/vendor/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/vendor/rustc-demangle/src/v0.rs b/vendor/rustc-demangle/src/v0.rs new file mode 100644 index 0000000..3e88fa6 --- /dev/null +++ b/vendor/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}"); + } +} |