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//===- llvm-cxxmap.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
//
//===----------------------------------------------------------------------===//
//
// llvm-cxxmap computes a correspondence between old symbol names and new
// symbol names based on a symbol equivalence file.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SymbolRemappingReader.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
cl::OptionCategory CXXMapCategory("CXX Map Options");
cl::opt<std::string> OldSymbolFile(cl::Positional, cl::Required,
cl::desc("<symbol-file>"),
cl::cat(CXXMapCategory));
cl::opt<std::string> NewSymbolFile(cl::Positional, cl::Required,
cl::desc("<symbol-file>"),
cl::cat(CXXMapCategory));
cl::opt<std::string> RemappingFile("remapping-file", cl::Required,
cl::desc("Remapping file"),
cl::cat(CXXMapCategory));
cl::alias RemappingFileA("r", cl::aliasopt(RemappingFile),
cl::cat(CXXMapCategory));
cl::opt<std::string> OutputFilename("output", cl::value_desc("output"),
cl::init("-"), cl::desc("Output file"),
cl::cat(CXXMapCategory));
cl::alias OutputFilenameA("o", cl::aliasopt(OutputFilename),
cl::cat(CXXMapCategory));
cl::opt<bool> WarnAmbiguous(
"Wambiguous",
cl::desc("Warn on equivalent symbols in the output symbol list"),
cl::cat(CXXMapCategory));
cl::opt<bool> WarnIncomplete(
"Wincomplete",
cl::desc("Warn on input symbols missing from output symbol list"),
cl::cat(CXXMapCategory));
static void warn(Twine Message, Twine Whence = "",
std::string Hint = "") {
WithColor::warning();
std::string WhenceStr = Whence.str();
if (!WhenceStr.empty())
errs() << WhenceStr << ": ";
errs() << Message << "\n";
if (!Hint.empty())
WithColor::note() << Hint << "\n";
}
static void exitWithError(Twine Message, Twine Whence = "",
std::string Hint = "") {
WithColor::error();
std::string WhenceStr = Whence.str();
if (!WhenceStr.empty())
errs() << WhenceStr << ": ";
errs() << Message << "\n";
if (!Hint.empty())
WithColor::note() << Hint << "\n";
::exit(1);
}
static void exitWithError(Error E, StringRef Whence = "") {
exitWithError(toString(std::move(E)), Whence);
}
static void exitWithErrorCode(std::error_code EC, StringRef Whence = "") {
exitWithError(EC.message(), Whence);
}
static void remapSymbols(MemoryBuffer &OldSymbolFile,
MemoryBuffer &NewSymbolFile,
MemoryBuffer &RemappingFile,
raw_ostream &Out) {
// Load the remapping file and prepare to canonicalize symbols.
SymbolRemappingReader Reader;
if (Error E = Reader.read(RemappingFile))
exitWithError(std::move(E));
// Canonicalize the new symbols.
DenseMap<SymbolRemappingReader::Key, StringRef> MappedNames;
DenseSet<StringRef> UnparseableSymbols;
for (line_iterator LineIt(NewSymbolFile, /*SkipBlanks=*/true, '#');
!LineIt.is_at_eof(); ++LineIt) {
StringRef Symbol = *LineIt;
auto K = Reader.insert(Symbol);
if (!K) {
UnparseableSymbols.insert(Symbol);
continue;
}
auto ItAndIsNew = MappedNames.insert({K, Symbol});
if (WarnAmbiguous && !ItAndIsNew.second &&
ItAndIsNew.first->second != Symbol) {
warn("symbol " + Symbol + " is equivalent to earlier symbol " +
ItAndIsNew.first->second,
NewSymbolFile.getBufferIdentifier() + ":" +
Twine(LineIt.line_number()),
"later symbol will not be the target of any remappings");
}
}
// Figure out which new symbol each old symbol is equivalent to.
for (line_iterator LineIt(OldSymbolFile, /*SkipBlanks=*/true, '#');
!LineIt.is_at_eof(); ++LineIt) {
StringRef Symbol = *LineIt;
auto K = Reader.lookup(Symbol);
StringRef NewSymbol = MappedNames.lookup(K);
if (NewSymbol.empty()) {
if (WarnIncomplete && !UnparseableSymbols.count(Symbol)) {
warn("no new symbol matches old symbol " + Symbol,
OldSymbolFile.getBufferIdentifier() + ":" +
Twine(LineIt.line_number()));
}
continue;
}
Out << Symbol << " " << NewSymbol << "\n";
}
}
int main(int argc, const char *argv[]) {
InitLLVM X(argc, argv);
cl::HideUnrelatedOptions({&CXXMapCategory, &getColorCategory()});
cl::ParseCommandLineOptions(argc, argv, "LLVM C++ mangled name remapper\n");
auto OldSymbolBufOrError = MemoryBuffer::getFileOrSTDIN(OldSymbolFile);
if (!OldSymbolBufOrError)
exitWithErrorCode(OldSymbolBufOrError.getError(), OldSymbolFile);
auto NewSymbolBufOrError = MemoryBuffer::getFileOrSTDIN(NewSymbolFile);
if (!NewSymbolBufOrError)
exitWithErrorCode(NewSymbolBufOrError.getError(), NewSymbolFile);
auto RemappingBufOrError = MemoryBuffer::getFileOrSTDIN(RemappingFile);
if (!RemappingBufOrError)
exitWithErrorCode(RemappingBufOrError.getError(), RemappingFile);
std::error_code EC;
raw_fd_ostream OS(OutputFilename.data(), EC, sys::fs::OF_TextWithCRLF);
if (EC)
exitWithErrorCode(EC, OutputFilename);
remapSymbols(*OldSymbolBufOrError.get(), *NewSymbolBufOrError.get(),
*RemappingBufOrError.get(), OS);
}
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