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/Support/SymbolRemappingReader.h"
15 #include "llvm/ADT/StringSwitch.h"
16 #include "llvm/ADT/Twine.h"
17 #include "llvm/Support/LineIterator.h"
18
19 using namespace llvm;
20
21 char SymbolRemappingParseError::ID;
22
23 /// Load a set of name remappings from a text file.
24 ///
25 /// See the documentation at the top of the file for an explanation of
26 /// the expected format.
read(MemoryBuffer & B)27 Error SymbolRemappingReader::read(MemoryBuffer &B) {
28 line_iterator LineIt(B, /*SkipBlanks=*/true, '#');
29
30 auto ReportError = [&](Twine Msg) {
31 return llvm::make_error<SymbolRemappingParseError>(
32 B.getBufferIdentifier(), LineIt.line_number(), Msg);
33 };
34
35 for (; !LineIt.is_at_eof(); ++LineIt) {
36 StringRef Line = *LineIt;
37 Line = Line.ltrim(' ');
38 // line_iterator only detects comments starting in column 1.
39 if (Line.startswith("#") || Line.empty())
40 continue;
41
42 SmallVector<StringRef, 4> Parts;
43 Line.split(Parts, ' ', /*MaxSplits*/-1, /*KeepEmpty*/false);
44
45 if (Parts.size() != 3)
46 return ReportError("Expected 'kind mangled_name mangled_name', "
47 "found '" + Line + "'");
48
49 using FK = ItaniumManglingCanonicalizer::FragmentKind;
50 Optional<FK> FragmentKind = StringSwitch<Optional<FK>>(Parts[0])
51 .Case("name", FK::Name)
52 .Case("type", FK::Type)
53 .Case("encoding", FK::Encoding)
54 .Default(None);
55 if (!FragmentKind)
56 return ReportError("Invalid kind, expected 'name', 'type', or 'encoding',"
57 " found '" + Parts[0] + "'");
58
59 using EE = ItaniumManglingCanonicalizer::EquivalenceError;
60 switch (Canonicalizer.addEquivalence(*FragmentKind, Parts[1], Parts[2])) {
61 case EE::Success:
62 break;
63
64 case EE::ManglingAlreadyUsed:
65 return ReportError("Manglings '" + Parts[1] + "' and '" + Parts[2] + "' "
66 "have both been used in prior remappings. Move this "
67 "remapping earlier in the file.");
68
69 case EE::InvalidFirstMangling:
70 return ReportError("Could not demangle '" + Parts[1] + "' "
71 "as a <" + Parts[0] + ">; invalid mangling?");
72
73 case EE::InvalidSecondMangling:
74 return ReportError("Could not demangle '" + Parts[2] + "' "
75 "as a <" + Parts[0] + ">; invalid mangling?");
76 }
77 }
78
79 return Error::success();
80 }
81