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//===-- llvm-c++filt.cpp --------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdlib>
#include <iostream>
using namespace llvm;
namespace {
enum ID {
OPT_INVALID = 0, // This is not an option ID.
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
HELPTEXT, METAVAR, VALUES) \
OPT_##ID,
#include "Opts.inc"
#undef OPTION
};
#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
#include "Opts.inc"
#undef PREFIX
const opt::OptTable::Info InfoTable[] = {
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
HELPTEXT, METAVAR, VALUES) \
{ \
PREFIX, NAME, HELPTEXT, \
METAVAR, OPT_##ID, opt::Option::KIND##Class, \
PARAM, FLAGS, OPT_##GROUP, \
OPT_##ALIAS, ALIASARGS, VALUES},
#include "Opts.inc"
#undef OPTION
};
class CxxfiltOptTable : public opt::OptTable {
public:
CxxfiltOptTable() : OptTable(InfoTable) { setGroupedShortOptions(true); }
};
} // namespace
static bool StripUnderscore;
static bool Types;
static StringRef ToolName;
static void error(const Twine &Message) {
WithColor::error(errs(), ToolName) << Message << '\n';
exit(1);
}
static std::string demangle(const std::string &Mangled) {
const char *DecoratedStr = Mangled.c_str();
if (StripUnderscore)
if (DecoratedStr[0] == '_')
++DecoratedStr;
std::string Result;
if (nonMicrosoftDemangle(DecoratedStr, Result))
return Result;
std::string Prefix;
char *Undecorated = nullptr;
if (Types)
Undecorated = itaniumDemangle(DecoratedStr, nullptr, nullptr, nullptr);
if (!Undecorated && strncmp(DecoratedStr, "__imp_", 6) == 0) {
Prefix = "import thunk for ";
Undecorated = itaniumDemangle(DecoratedStr + 6, nullptr, nullptr, nullptr);
}
Result = Undecorated ? Prefix + Undecorated : Mangled;
free(Undecorated);
return Result;
}
// Split 'Source' on any character that fails to pass 'IsLegalChar'. The
// returned vector consists of pairs where 'first' is the delimited word, and
// 'second' are the delimiters following that word.
static void SplitStringDelims(
StringRef Source,
SmallVectorImpl<std::pair<StringRef, StringRef>> &OutFragments,
function_ref<bool(char)> IsLegalChar) {
// The beginning of the input string.
const auto Head = Source.begin();
// Obtain any leading delimiters.
auto Start = std::find_if(Head, Source.end(), IsLegalChar);
if (Start != Head)
OutFragments.push_back({"", Source.slice(0, Start - Head)});
// Capture each word and the delimiters following that word.
while (Start != Source.end()) {
Start = std::find_if(Start, Source.end(), IsLegalChar);
auto End = std::find_if_not(Start, Source.end(), IsLegalChar);
auto DEnd = std::find_if(End, Source.end(), IsLegalChar);
OutFragments.push_back({Source.slice(Start - Head, End - Head),
Source.slice(End - Head, DEnd - Head)});
Start = DEnd;
}
}
// This returns true if 'C' is a character that can show up in an
// Itanium-mangled string.
static bool IsLegalItaniumChar(char C) {
// Itanium CXX ABI [External Names]p5.1.1:
// '$' and '.' in mangled names are reserved for private implementations.
return isAlnum(C) || C == '.' || C == '$' || C == '_';
}
// If 'Split' is true, then 'Mangled' is broken into individual words and each
// word is demangled. Otherwise, the entire string is treated as a single
// mangled item. The result is output to 'OS'.
static void demangleLine(llvm::raw_ostream &OS, StringRef Mangled, bool Split) {
std::string Result;
if (Split) {
SmallVector<std::pair<StringRef, StringRef>, 16> Words;
SplitStringDelims(Mangled, Words, IsLegalItaniumChar);
for (const auto &Word : Words)
Result += ::demangle(std::string(Word.first)) + Word.second.str();
} else
Result = ::demangle(std::string(Mangled));
OS << Result << '\n';
OS.flush();
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
BumpPtrAllocator A;
StringSaver Saver(A);
CxxfiltOptTable Tbl;
ToolName = argv[0];
opt::InputArgList Args = Tbl.parseArgs(argc, argv, OPT_UNKNOWN, Saver,
[&](StringRef Msg) { error(Msg); });
if (Args.hasArg(OPT_help)) {
Tbl.printHelp(outs(),
(Twine(ToolName) + " [options] <mangled>").str().c_str(),
"LLVM symbol undecoration tool");
// TODO Replace this with OptTable API once it adds extrahelp support.
outs() << "\nPass @FILE as argument to read options from FILE.\n";
return 0;
}
if (Args.hasArg(OPT_version)) {
outs() << ToolName << '\n';
cl::PrintVersionMessage();
return 0;
}
// The default value depends on the default triple. Mach-O has symbols
// prefixed with "_", so strip by default.
if (opt::Arg *A =
Args.getLastArg(OPT_strip_underscore, OPT_no_strip_underscore))
StripUnderscore = A->getOption().matches(OPT_strip_underscore);
else
StripUnderscore = Triple(sys::getProcessTriple()).isOSBinFormatMachO();
Types = Args.hasArg(OPT_types);
std::vector<std::string> Decorated = Args.getAllArgValues(OPT_INPUT);
if (Decorated.empty())
for (std::string Mangled; std::getline(std::cin, Mangled);)
demangleLine(llvm::outs(), Mangled, true);
else
for (const auto &Symbol : Decorated)
demangleLine(llvm::outs(), Symbol, false);
return EXIT_SUCCESS;
}
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