1 //===- SymbolRemappingReader.cpp - Read symbol remapping file -------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains definitions needed for reading and applying symbol 10 // remapping files. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ProfileData/SymbolRemappingReader.h" 15 #include "llvm/ADT/StringSwitch.h" 16 #include "llvm/ADT/Twine.h" 17 #include "llvm/Support/LineIterator.h" 18 #include "llvm/Support/MemoryBuffer.h" 19 20 using namespace llvm; 21 22 char SymbolRemappingParseError::ID; 23 24 /// Load a set of name remappings from a text file. 25 /// 26 /// See the documentation at the top of the file for an explanation of 27 /// the expected format. 28 Error SymbolRemappingReader::read(MemoryBuffer &B) { 29 line_iterator LineIt(B, /*SkipBlanks=*/true, '#'); 30 31 auto ReportError = [&](Twine Msg) { 32 return llvm::make_error<SymbolRemappingParseError>( 33 B.getBufferIdentifier(), LineIt.line_number(), Msg); 34 }; 35 36 for (; !LineIt.is_at_eof(); ++LineIt) { 37 StringRef Line = *LineIt; 38 Line = Line.ltrim(' '); 39 // line_iterator only detects comments starting in column 1. 40 if (Line.startswith("#") || Line.empty()) 41 continue; 42 43 SmallVector<StringRef, 4> Parts; 44 Line.split(Parts, ' ', /*MaxSplits*/-1, /*KeepEmpty*/false); 45 46 if (Parts.size() != 3) 47 return ReportError("Expected 'kind mangled_name mangled_name', " 48 "found '" + Line + "'"); 49 50 using FK = ItaniumManglingCanonicalizer::FragmentKind; 51 std::optional<FK> FragmentKind = StringSwitch<std::optional<FK>>(Parts[0]) 52 .Case("name", FK::Name) 53 .Case("type", FK::Type) 54 .Case("encoding", FK::Encoding) 55 .Default(std::nullopt); 56 if (!FragmentKind) 57 return ReportError("Invalid kind, expected 'name', 'type', or 'encoding'," 58 " found '" + Parts[0] + "'"); 59 60 using EE = ItaniumManglingCanonicalizer::EquivalenceError; 61 switch (Canonicalizer.addEquivalence(*FragmentKind, Parts[1], Parts[2])) { 62 case EE::Success: 63 break; 64 65 case EE::ManglingAlreadyUsed: 66 return ReportError("Manglings '" + Parts[1] + "' and '" + Parts[2] + "' " 67 "have both been used in prior remappings. Move this " 68 "remapping earlier in the file."); 69 70 case EE::InvalidFirstMangling: 71 return ReportError("Could not demangle '" + Parts[1] + "' " 72 "as a <" + Parts[0] + ">; invalid mangling?"); 73 74 case EE::InvalidSecondMangling: 75 return ReportError("Could not demangle '" + Parts[2] + "' " 76 "as a <" + Parts[0] + ">; invalid mangling?"); 77 } 78 } 79 80 return Error::success(); 81 } 82