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//===- SymbolRemappingReader.cpp - Read symbol remapping file -------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains definitions needed for reading and applying symbol
// remapping files.
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/SymbolRemappingReader.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
char SymbolRemappingParseError::ID;
/// Load a set of name remappings from a text file.
///
/// See the documentation at the top of the file for an explanation of
/// the expected format.
Error SymbolRemappingReader::read(MemoryBuffer &B) {
line_iterator LineIt(B, /*SkipBlanks=*/true, '#');
auto ReportError = [&](Twine Msg) {
return llvm::make_error<SymbolRemappingParseError>(
B.getBufferIdentifier(), LineIt.line_number(), Msg);
};
for (; !LineIt.is_at_eof(); ++LineIt) {
StringRef Line = *LineIt;
Line = Line.ltrim(' ');
// line_iterator only detects comments starting in column 1.
if (Line.startswith("#") || Line.empty())
continue;
SmallVector<StringRef, 4> Parts;
Line.split(Parts, ' ', /*MaxSplits*/-1, /*KeepEmpty*/false);
if (Parts.size() != 3)
return ReportError("Expected 'kind mangled_name mangled_name', "
"found '" + Line + "'");
using FK = ItaniumManglingCanonicalizer::FragmentKind;
std::optional<FK> FragmentKind = StringSwitch<std::optional<FK>>(Parts[0])
.Case("name", FK::Name)
.Case("type", FK::Type)
.Case("encoding", FK::Encoding)
.Default(std::nullopt);
if (!FragmentKind)
return ReportError("Invalid kind, expected 'name', 'type', or 'encoding',"
" found '" + Parts[0] + "'");
using EE = ItaniumManglingCanonicalizer::EquivalenceError;
switch (Canonicalizer.addEquivalence(*FragmentKind, Parts[1], Parts[2])) {
case EE::Success:
break;
case EE::ManglingAlreadyUsed:
return ReportError("Manglings '" + Parts[1] + "' and '" + Parts[2] + "' "
"have both been used in prior remappings. Move this "
"remapping earlier in the file.");
case EE::InvalidFirstMangling:
return ReportError("Could not demangle '" + Parts[1] + "' "
"as a <" + Parts[0] + ">; invalid mangling?");
case EE::InvalidSecondMangling:
return ReportError("Could not demangle '" + Parts[2] + "' "
"as a <" + Parts[0] + ">; invalid mangling?");
}
}
return Error::success();
}
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