| // Copyright 2018 The Abseil Authors. |
| // |
| // 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 |
| // |
| // https://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. |
| |
| // An async-signal-safe and thread-safe demangler for Itanium C++ ABI |
| // (aka G++ V3 ABI). |
| // |
| // The demangler is implemented to be used in async signal handlers to |
| // symbolize stack traces. We cannot use libstdc++'s |
| // abi::__cxa_demangle() in such signal handlers since it's not async |
| // signal safe (it uses malloc() internally). |
| // |
| // Note that this demangler doesn't support full demangling. More |
| // specifically, it doesn't print types of function parameters and |
| // types of template arguments. It just skips them. However, it's |
| // still very useful to extract basic information such as class, |
| // function, constructor, destructor, and operator names. |
| // |
| // See the implementation note in demangle.cc if you are interested. |
| // |
| // Example: |
| // |
| // | Mangled Name | The Demangler | abi::__cxa_demangle() |
| // |---------------|---------------|----------------------- |
| // | _Z1fv | f() | f() |
| // | _Z1fi | f() | f(int) |
| // | _Z3foo3bar | foo() | foo(bar) |
| // | _Z1fIiEvi | f<>() | void f<int>(int) |
| // | _ZN1N1fE | N::f | N::f |
| // | _ZN3Foo3BarEv | Foo::Bar() | Foo::Bar() |
| // | _Zrm1XS_" | operator%() | operator%(X, X) |
| // | _ZN3FooC1Ev | Foo::Foo() | Foo::Foo() |
| // | _Z1fSs | f() | f(std::basic_string<char, |
| // | | | std::char_traits<char>, |
| // | | | std::allocator<char> >) |
| // |
| // See the unit test for more examples. |
| // |
| // Note: we might want to write demanglers for ABIs other than Itanium |
| // C++ ABI in the future. |
| // |
| |
| #ifndef ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ |
| #define ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ |
| |
| namespace absl { |
| namespace debugging_internal { |
| |
| // Demangle `mangled`. On success, return true and write the |
| // demangled symbol name to `out`. Otherwise, return false. |
| // `out` is modified even if demangling is unsuccessful. |
| bool Demangle(const char *mangled, char *out, int out_size); |
| |
| } // namespace debugging_internal |
| } // namespace absl |
| |
| #endif // ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ |
