1 //===- lib/Core/Reader.cpp ------------------------------------------------===//
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 #include "lld/Core/Reader.h"
10 #include "lld/Core/File.h"
11 #include "lld/Core/Reference.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/BinaryFormat/Magic.h"
14 #include "llvm/Support/Errc.h"
15 #include "llvm/Support/FileSystem.h"
16 #include "llvm/Support/MemoryBuffer.h"
17 #include <algorithm>
18 #include <memory>
19
20 using llvm::file_magic;
21 using llvm::identify_magic;
22
23 namespace lld {
24
25 YamlIOTaggedDocumentHandler::~YamlIOTaggedDocumentHandler() = default;
26
add(std::unique_ptr<Reader> reader)27 void Registry::add(std::unique_ptr<Reader> reader) {
28 _readers.push_back(std::move(reader));
29 }
30
add(std::unique_ptr<YamlIOTaggedDocumentHandler> handler)31 void Registry::add(std::unique_ptr<YamlIOTaggedDocumentHandler> handler) {
32 _yamlHandlers.push_back(std::move(handler));
33 }
34
35 ErrorOr<std::unique_ptr<File>>
loadFile(std::unique_ptr<MemoryBuffer> mb) const36 Registry::loadFile(std::unique_ptr<MemoryBuffer> mb) const {
37 // Get file magic.
38 StringRef content(mb->getBufferStart(), mb->getBufferSize());
39 file_magic fileType = identify_magic(content);
40
41 // Ask each registered reader if it can handle this file type or extension.
42 for (const std::unique_ptr<Reader> &reader : _readers) {
43 if (!reader->canParse(fileType, mb->getMemBufferRef()))
44 continue;
45 return reader->loadFile(std::move(mb), *this);
46 }
47
48 // No Reader could parse this file.
49 return make_error_code(llvm::errc::executable_format_error);
50 }
51
52 static const Registry::KindStrings kindStrings[] = {
53 {Reference::kindLayoutAfter, "layout-after"},
54 {Reference::kindAssociate, "associate"},
55 LLD_KIND_STRING_END};
56
Registry()57 Registry::Registry() {
58 addKindTable(Reference::KindNamespace::all, Reference::KindArch::all,
59 kindStrings);
60 }
61
handleTaggedDoc(llvm::yaml::IO & io,const lld::File * & file) const62 bool Registry::handleTaggedDoc(llvm::yaml::IO &io,
63 const lld::File *&file) const {
64 for (const std::unique_ptr<YamlIOTaggedDocumentHandler> &h : _yamlHandlers)
65 if (h->handledDocTag(io, file))
66 return true;
67 return false;
68 }
69
addKindTable(Reference::KindNamespace ns,Reference::KindArch arch,const KindStrings array[])70 void Registry::addKindTable(Reference::KindNamespace ns,
71 Reference::KindArch arch,
72 const KindStrings array[]) {
73 KindEntry entry = { ns, arch, array };
74 _kindEntries.push_back(entry);
75 }
76
referenceKindFromString(StringRef inputStr,Reference::KindNamespace & ns,Reference::KindArch & arch,Reference::KindValue & value) const77 bool Registry::referenceKindFromString(StringRef inputStr,
78 Reference::KindNamespace &ns,
79 Reference::KindArch &arch,
80 Reference::KindValue &value) const {
81 for (const KindEntry &entry : _kindEntries) {
82 for (const KindStrings *pair = entry.array; !pair->name.empty(); ++pair) {
83 if (!inputStr.equals(pair->name))
84 continue;
85 ns = entry.ns;
86 arch = entry.arch;
87 value = pair->value;
88 return true;
89 }
90 }
91 return false;
92 }
93
referenceKindToString(Reference::KindNamespace ns,Reference::KindArch arch,Reference::KindValue value,StringRef & str) const94 bool Registry::referenceKindToString(Reference::KindNamespace ns,
95 Reference::KindArch arch,
96 Reference::KindValue value,
97 StringRef &str) const {
98 for (const KindEntry &entry : _kindEntries) {
99 if (entry.ns != ns)
100 continue;
101 if (entry.arch != arch)
102 continue;
103 for (const KindStrings *pair = entry.array; !pair->name.empty(); ++pair) {
104 if (pair->value != value)
105 continue;
106 str = pair->name;
107 return true;
108 }
109 }
110 return false;
111 }
112
113 } // end namespace lld
114