63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <folly/FBString.h>
|
||
|
|
|
||
|
|
namespace folly {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return the demangled (prettyfied) version of a C++ type.
|
||
|
|
*
|
||
|
|
* This function tries to produce a human-readable type, but the type name will
|
||
|
|
* be returned unchanged in case of error or if demangling isn't supported on
|
||
|
|
* your system.
|
||
|
|
*
|
||
|
|
* Use for debugging -- do not rely on demangle() returning anything useful.
|
||
|
|
*
|
||
|
|
* This function may allocate memory (and therefore throw std::bad_alloc).
|
||
|
|
*/
|
||
|
|
fbstring demangle(const char* name);
|
||
|
|
inline fbstring demangle(const std::type_info& type) {
|
||
|
|
return demangle(type.name());
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return the demangled (prettyfied) version of a C++ type in a user-provided
|
||
|
|
* buffer.
|
||
|
|
*
|
||
|
|
* The semantics are the same as for snprintf or strlcpy: bufSize is the size
|
||
|
|
* of the buffer, the string is always null-terminated, and the return value is
|
||
|
|
* the number of characters (not including the null terminator) that would have
|
||
|
|
* been written if the buffer was big enough. (So a return value >= bufSize
|
||
|
|
* indicates that the output was truncated)
|
||
|
|
*
|
||
|
|
* This function does not allocate memory and is async-signal-safe.
|
||
|
|
*
|
||
|
|
* Note that the underlying function for the fbstring-returning demangle is
|
||
|
|
* somewhat standard (abi::__cxa_demangle, which uses malloc), the underlying
|
||
|
|
* function for this version is less so (cplus_demangle_v3_callback from
|
||
|
|
* libiberty), so it is possible for the fbstring version to work, while this
|
||
|
|
* version returns the original, mangled name.
|
||
|
|
*/
|
||
|
|
size_t demangle(const char* name, char* out, size_t outSize);
|
||
|
|
inline size_t demangle(const std::type_info& type, char* buf, size_t bufSize) {
|
||
|
|
return demangle(type.name(), buf, bufSize);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace folly
|