1 //===- Binary.h - A generic binary file -------------------------*- C++ -*-===//
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 declares the Binary class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_OBJECT_BINARY_H
14 #define LLVM_OBJECT_BINARY_H
15 
16 #include "llvm-c/Types.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Object/Error.h"
19 #include "llvm/Support/Error.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include <algorithm>
22 #include <memory>
23 #include <utility>
24 
25 namespace llvm {
26 
27 class LLVMContext;
28 class StringRef;
29 
30 namespace object {
31 
32 class Binary {
33 private:
34   unsigned int TypeID;
35 
36 protected:
37   MemoryBufferRef Data;
38 
39   Binary(unsigned int Type, MemoryBufferRef Source);
40 
41   enum {
42     ID_Archive,
43     ID_MachOUniversalBinary,
44     ID_COFFImportFile,
45     ID_IR,            // LLVM IR
46     ID_TapiUniversal, // Text-based Dynamic Library Stub file.
47     ID_TapiFile,      // Text-based Dynamic Library Stub file.
48 
49     ID_Minidump,
50 
51     ID_WinRes, // Windows resource (.res) file.
52 
53     // Object and children.
54     ID_StartObjects,
55     ID_COFF,
56 
57     ID_XCOFF32, // AIX XCOFF 32-bit
58     ID_XCOFF64, // AIX XCOFF 64-bit
59 
60     ID_ELF32L, // ELF 32-bit, little endian
61     ID_ELF32B, // ELF 32-bit, big endian
62     ID_ELF64L, // ELF 64-bit, little endian
63     ID_ELF64B, // ELF 64-bit, big endian
64 
65     ID_MachO32L, // MachO 32-bit, little endian
66     ID_MachO32B, // MachO 32-bit, big endian
67     ID_MachO64L, // MachO 64-bit, little endian
68     ID_MachO64B, // MachO 64-bit, big endian
69 
70     ID_Wasm,
71 
72     ID_EndObjects
73   };
74 
getELFType(bool isLE,bool is64Bits)75   static inline unsigned int getELFType(bool isLE, bool is64Bits) {
76     if (isLE)
77       return is64Bits ? ID_ELF64L : ID_ELF32L;
78     else
79       return is64Bits ? ID_ELF64B : ID_ELF32B;
80   }
81 
getMachOType(bool isLE,bool is64Bits)82   static unsigned int getMachOType(bool isLE, bool is64Bits) {
83     if (isLE)
84       return is64Bits ? ID_MachO64L : ID_MachO32L;
85     else
86       return is64Bits ? ID_MachO64B : ID_MachO32B;
87   }
88 
89 public:
90   Binary() = delete;
91   Binary(const Binary &other) = delete;
92   virtual ~Binary();
93 
initContent()94   virtual Error initContent() { return Error::success(); };
95 
96   StringRef getData() const;
97   StringRef getFileName() const;
98   MemoryBufferRef getMemoryBufferRef() const;
99 
100   // Cast methods.
getType()101   unsigned int getType() const { return TypeID; }
102 
103   // Convenience methods
isObject()104   bool isObject() const {
105     return TypeID > ID_StartObjects && TypeID < ID_EndObjects;
106   }
107 
isSymbolic()108   bool isSymbolic() const {
109     return isIR() || isObject() || isCOFFImportFile() || isTapiFile();
110   }
111 
isArchive()112   bool isArchive() const { return TypeID == ID_Archive; }
113 
isMachOUniversalBinary()114   bool isMachOUniversalBinary() const {
115     return TypeID == ID_MachOUniversalBinary;
116   }
117 
isTapiUniversal()118   bool isTapiUniversal() const { return TypeID == ID_TapiUniversal; }
119 
isELF()120   bool isELF() const {
121     return TypeID >= ID_ELF32L && TypeID <= ID_ELF64B;
122   }
123 
isMachO()124   bool isMachO() const {
125     return TypeID >= ID_MachO32L && TypeID <= ID_MachO64B;
126   }
127 
isCOFF()128   bool isCOFF() const {
129     return TypeID == ID_COFF;
130   }
131 
isXCOFF()132   bool isXCOFF() const { return TypeID == ID_XCOFF32 || TypeID == ID_XCOFF64; }
133 
isWasm()134   bool isWasm() const { return TypeID == ID_Wasm; }
135 
isCOFFImportFile()136   bool isCOFFImportFile() const {
137     return TypeID == ID_COFFImportFile;
138   }
139 
isIR()140   bool isIR() const {
141     return TypeID == ID_IR;
142   }
143 
isMinidump()144   bool isMinidump() const { return TypeID == ID_Minidump; }
145 
isTapiFile()146   bool isTapiFile() const { return TypeID == ID_TapiFile; }
147 
isLittleEndian()148   bool isLittleEndian() const {
149     return !(TypeID == ID_ELF32B || TypeID == ID_ELF64B ||
150              TypeID == ID_MachO32B || TypeID == ID_MachO64B);
151   }
152 
isWinRes()153   bool isWinRes() const { return TypeID == ID_WinRes; }
154 
getTripleObjectFormat()155   Triple::ObjectFormatType getTripleObjectFormat() const {
156     if (isCOFF())
157       return Triple::COFF;
158     if (isMachO())
159       return Triple::MachO;
160     if (isELF())
161       return Triple::ELF;
162     return Triple::UnknownObjectFormat;
163   }
164 
checkOffset(MemoryBufferRef M,uintptr_t Addr,const uint64_t Size)165   static Error checkOffset(MemoryBufferRef M, uintptr_t Addr,
166                            const uint64_t Size) {
167     if (Addr + Size < Addr || Addr + Size < Size ||
168         Addr + Size > reinterpret_cast<uintptr_t>(M.getBufferEnd()) ||
169         Addr < reinterpret_cast<uintptr_t>(M.getBufferStart())) {
170       return errorCodeToError(object_error::unexpected_eof);
171     }
172     return Error::success();
173   }
174 };
175 
176 // Create wrappers for C Binding types (see CBindingWrapping.h).
177 DEFINE_ISA_CONVERSION_FUNCTIONS(Binary, LLVMBinaryRef)
178 
179 /// Create a Binary from Source, autodetecting the file type.
180 ///
181 /// @param Source The data to create the Binary from.
182 Expected<std::unique_ptr<Binary>> createBinary(MemoryBufferRef Source,
183                                                LLVMContext *Context = nullptr,
184                                                bool InitContent = true);
185 
186 template <typename T> class OwningBinary {
187   std::unique_ptr<T> Bin;
188   std::unique_ptr<MemoryBuffer> Buf;
189 
190 public:
191   OwningBinary();
192   OwningBinary(std::unique_ptr<T> Bin, std::unique_ptr<MemoryBuffer> Buf);
193   OwningBinary(OwningBinary<T>&& Other);
194   OwningBinary<T> &operator=(OwningBinary<T> &&Other);
195 
196   std::pair<std::unique_ptr<T>, std::unique_ptr<MemoryBuffer>> takeBinary();
197 
198   T* getBinary();
199   const T* getBinary() const;
200 };
201 
202 template <typename T>
OwningBinary(std::unique_ptr<T> Bin,std::unique_ptr<MemoryBuffer> Buf)203 OwningBinary<T>::OwningBinary(std::unique_ptr<T> Bin,
204                               std::unique_ptr<MemoryBuffer> Buf)
205     : Bin(std::move(Bin)), Buf(std::move(Buf)) {}
206 
207 template <typename T> OwningBinary<T>::OwningBinary() = default;
208 
209 template <typename T>
OwningBinary(OwningBinary && Other)210 OwningBinary<T>::OwningBinary(OwningBinary &&Other)
211     : Bin(std::move(Other.Bin)), Buf(std::move(Other.Buf)) {}
212 
213 template <typename T>
214 OwningBinary<T> &OwningBinary<T>::operator=(OwningBinary &&Other) {
215   Bin = std::move(Other.Bin);
216   Buf = std::move(Other.Buf);
217   return *this;
218 }
219 
220 template <typename T>
221 std::pair<std::unique_ptr<T>, std::unique_ptr<MemoryBuffer>>
takeBinary()222 OwningBinary<T>::takeBinary() {
223   return std::make_pair(std::move(Bin), std::move(Buf));
224 }
225 
getBinary()226 template <typename T> T* OwningBinary<T>::getBinary() {
227   return Bin.get();
228 }
229 
getBinary()230 template <typename T> const T* OwningBinary<T>::getBinary() const {
231   return Bin.get();
232 }
233 
234 Expected<OwningBinary<Binary>> createBinary(StringRef Path,
235                                             LLVMContext *Context = nullptr,
236                                             bool InitContent = true);
237 
238 } // end namespace object
239 
240 } // end namespace llvm
241 
242 #endif // LLVM_OBJECT_BINARY_H
243