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//===-- Demangle.cpp - Common demangling functions ------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file This file contains definitions of common demangling functions.
///
//===----------------------------------------------------------------------===//
#include "llvm/Demangle/Demangle.h"
#include "llvm/Demangle/StringViewExtras.h"
#include <cstdlib>
#include <string_view>
using llvm::itanium_demangle::starts_with;
std::string llvm::demangle(std::string_view MangledName) {
std::string Result;
if (nonMicrosoftDemangle(MangledName, Result))
return Result;
if (starts_with(MangledName, '_') &&
nonMicrosoftDemangle(MangledName.substr(1), Result,
/*CanHaveLeadingDot=*/false))
return Result;
if (char *Demangled = microsoftDemangle(MangledName, nullptr, nullptr)) {
Result = Demangled;
std::free(Demangled);
} else {
Result = MangledName;
}
return Result;
}
static bool isItaniumEncoding(std::string_view S) {
// Itanium demangler supports prefixes with 1-4 underscores.
const size_t Pos = S.find_first_not_of('_');
return Pos > 0 && Pos <= 4 && S[Pos] == 'Z';
}
static bool isRustEncoding(std::string_view S) { return starts_with(S, "_R"); }
static bool isDLangEncoding(std::string_view S) { return starts_with(S, "_D"); }
bool llvm::nonMicrosoftDemangle(std::string_view MangledName,
std::string &Result, bool CanHaveLeadingDot,
bool ParseParams) {
char *Demangled = nullptr;
// Do not consider the dot prefix as part of the demangled symbol name.
if (CanHaveLeadingDot && MangledName.size() > 0 && MangledName[0] == '.') {
MangledName.remove_prefix(1);
Result = ".";
}
if (isItaniumEncoding(MangledName))
Demangled = itaniumDemangle(MangledName, ParseParams);
else if (isRustEncoding(MangledName))
Demangled = rustDemangle(MangledName);
else if (isDLangEncoding(MangledName))
Demangled = dlangDemangle(MangledName);
if (!Demangled)
return false;
Result += Demangled;
std::free(Demangled);
return true;
}
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