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// C++ IA64 / g++ v3 demangler -*- C++ -*-
// Copyright (C) 2003 Free Software Foundation, Inc.
// Written by Carlo Wood <carlo@alinoe.com>
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#include <bits/demangle.h>
#include <cxxabi.h>
// __cxa_demangle
//
// Demangle a C++ symbol or type name.
//
// `mangled-name' is a pointer to a null-terminated array of characters.
// It may be either an external name, i.e. with a "_Z" prefix, or an
// internal NTBS mangling, e.g. of a type for type_info.
//
// `buf' may be null. If it is non-null, then n must also be non-null,
// and buf is a pointer to an array, of at least *n characters, that
// was allocated using malloc.
//
// `status' points to an int that is used as an error indicator. It is
// permitted to be null, in which case the user just doesn't get any
// detailed error information.
//
// Returns: a pointer to a null-terminated array of characters, the
// demangled name. Or NULL in case of failure.
//
// If there is an error in demangling, the return value is a null pointer.
// The user can examine *status to find out what kind of error occurred.
// Meaning of error indications:
//
// * 0: success
// * -1: memory allocation failure
// * -2: invalid mangled name
// * -3: invalid arguments (e.g. buf nonnull and n null)
//
namespace __cxxabiv1
{
namespace
{
char* const error = 0;
enum status_codes
{
success = 0,
memory_allocation_failure = -1,
invalid_mangled_name = -2,
invalid_argument = -3
};
inline char*
failure(status_codes error_code, int* status)
{
if (status)
*status = error_code;
return error;
}
char*
finish(char const* demangled_name, size_t demangled_name_size,
char* buf, size_t* n, int* status)
{
if (!buf || *n < demangled_name_size + 1)
{
if (n)
*n = demangled_name_size + 1;
buf = (char*)realloc(buf, demangled_name_size + 1);
if (!buf)
return failure(memory_allocation_failure, status);
}
if (status)
*status = success;
std::strncpy(buf, demangled_name, demangled_name_size);
buf[demangled_name_size] = 0;
return buf;
}
} // namespace
char*
__cxa_demangle(char const* mangled_name, char* buf, std::size_t* n,
int* status)
{
using namespace __gnu_cxx;
typedef demangler::session<std::allocator<char> > session_type;
if (!mangled_name || (buf && !n))
return failure(invalid_argument, status);
std::string result;
if (mangled_name[0] == '_')
{
// External name?
if (mangled_name[1] == 'Z')
{
// C++ name?
int cnt = session_type::
decode_encoding(result, mangled_name + 2, INT_MAX);
if (cnt < 0 || mangled_name[cnt + 2] != 0)
return failure(invalid_mangled_name, status);
return finish(result.data(), result.size(), buf, n, status);
}
else if (mangled_name[1] == 'G')
{
// Possible _GLOBAL__ extension?
if (!std::strncmp(mangled_name, "_GLOBAL__", 9)
&& (mangled_name[9] == 'D' || mangled_name[9] == 'I')
&& mangled_name[10] == '_')
{
if (mangled_name[9] == 'D')
result.assign("global destructors keyed to ", 28);
else
result.assign("global constructors keyed to ", 29);
// Output the disambiguation part as-is.
result += mangled_name + 11;
return finish(result.data(), result.size(), buf, n, status);
}
}
}
// Ambiguities are possible between extern "C" object names and
// internal built-in type names, e.g. "i" may be either an object
// named "i" or the built-in "int" type. Such ambiguities should
// be resolved to user names over built-in names. Builtin types
// are any single lower case character. Any other single
// character is not a mangled type so we can treat those the same
// here.
if (mangled_name[1] == 0)
return finish(mangled_name, 1, buf, n, status);
// Not a built-in type or external name, try to demangle input as
// NTBS mangled type name.
session_type demangler_session(mangled_name, INT_MAX);
if (!demangler_session.decode_type(result)
|| demangler_session.remaining_input_characters())
{
// Failure to demangle, assume extern "C" name.
result = mangled_name;
}
return finish(result.data(), result.size(), buf, n, status);
}
} // namespace __cxxabiv1
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