DebugInfo/DWARF/DWARFRelocMap.h

0001 //===- DWARFRelocMap.h ------------------------------------------*- C++ -*-===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef LLVM_DEBUGINFO_DWARF_DWARFRELOCMAP_H
0010 #define LLVM_DEBUGINFO_DWARF_DWARFRELOCMAP_H
0011
0012 #include "llvm/ADT/DenseMap.h"
0013 #include "llvm/Object/ObjectFile.h"
0014 #include "llvm/Object/RelocationResolver.h"
0015 #include <cstdint>
0016
0017 namespace llvm {
0018
0019 /// RelocAddrEntry contains relocated value and section index.
0020 /// Section index is -1LL if relocation points to absolute symbol.
0021 struct RelocAddrEntry {
0022   uint64_t SectionIndex;
0023   object::RelocationRef Reloc;
0024   uint64_t SymbolValue;
0025   std::optional<object::RelocationRef> Reloc2;
0026   uint64_t SymbolValue2;
0027   object::RelocationResolver Resolver;
0028 };
0029
0030 /// In place of applying the relocations to the data we've read from disk we use
0031 /// a separate mapping table to the side and checking that at locations in the
0032 /// dwarf where we expect relocated values. This adds a bit of complexity to the
0033 /// dwarf parsing/extraction at the benefit of not allocating memory for the
0034 /// entire size of the debug info sections.
0035 using RelocAddrMap = DenseMap<uint64_t, RelocAddrEntry>;
0036
0037 } // end namespace llvm
0038
0039 #endif // LLVM_DEBUGINFO_DWARF_DWARFRELOCMAP_H