71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
//===- DWARFDataExtractor.h -------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTOR_H
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#define LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTOR_H
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/DebugInfo/DWARF/DWARFObject.h"
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#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
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#include "llvm/DebugInfo/DWARF/DWARFSection.h"
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#include "llvm/DebugInfo/DWARF/LowLevel/DWARFDataExtractorSimple.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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/// A DWARFDataExtractor (typically for an in-memory copy of an object-file
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/// section) plus a relocation map for that section, if there is one.
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class DWARFDataExtractor : public DWARFDataExtractorBase<DWARFDataExtractor> {
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const DWARFObject *Obj = nullptr;
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const DWARFSection *Section = nullptr;
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public:
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using DWARFDataExtractorBase::DWARFDataExtractorBase;
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/// Constructor for the normal case of extracting data from a DWARF section.
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/// The DWARFSection's lifetime must be at least as long as the extractor's.
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DWARFDataExtractor(const DWARFObject &Obj, const DWARFSection &Section,
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bool IsLittleEndian, uint8_t AddressSize)
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: DWARFDataExtractorBase(Section.Data, IsLittleEndian, AddressSize),
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Obj(&Obj), Section(&Section) {}
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/// Truncating constructor
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DWARFDataExtractor(const DWARFDataExtractor &Other, size_t Length)
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: DWARFDataExtractorBase(Other.getData().substr(0, Length),
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Other.isLittleEndian(), Other.getAddressSize()),
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Obj(Other.Obj), Section(Other.Section) {}
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/// Extracts a value and applies a relocation to the result if
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/// one exists for the given offset.
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uint64_t getRelocatedValueImpl(uint32_t Size, uint64_t *Off, uint64_t *SecNdx,
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Error *Err) const {
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if (SecNdx)
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*SecNdx = object::SectionedAddress::UndefSection;
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if (!Section)
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return getUnsigned(Off, Size, Err);
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ErrorAsOutParameter ErrAsOut(Err);
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std::optional<RelocAddrEntry> E = Obj->find(*Section, *Off);
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uint64_t LocData = getUnsigned(Off, Size, Err);
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if (!E || (Err && *Err))
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return LocData;
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if (SecNdx)
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*SecNdx = E->SectionIndex;
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uint64_t R = object::resolveRelocation(E->Resolver, E->Reloc,
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E->SymbolValue, LocData);
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if (E->Reloc2)
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R = object::resolveRelocation(E->Resolver, *E->Reloc2, E->SymbolValue2,
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R);
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return R;
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}
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};
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} // end namespace llvm
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#endif // LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTOR_H
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