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8175be535a
There are two methods in SectionRef that can fail: * getName: The index into the string table can be invalid. * getContents: The section might point to invalid contents. Every other method will always succeed and returning and std::error_code just complicates the code. For example, a section can have an invalid alignment, but if we are able to get to the section structure at all and create a SectionRef, we will always be able to read that invalid alignment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219314 91177308-0d34-0410-b5e6-96231b3b80d8
514 lines
17 KiB
C++
514 lines
17 KiB
C++
//===- ObjectFile.h - File format independent object file -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares a file format independent ObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_OBJECTFILE_H
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#define LLVM_OBJECT_OBJECTFILE_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/SymbolicFile.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cstring>
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#include <vector>
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namespace llvm {
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namespace object {
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class ObjectFile;
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class COFFObjectFile;
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class MachOObjectFile;
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class SymbolRef;
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class symbol_iterator;
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/// RelocationRef - This is a value type class that represents a single
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/// relocation in the list of relocations in the object file.
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class RelocationRef {
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DataRefImpl RelocationPimpl;
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const ObjectFile *OwningObject;
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public:
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RelocationRef() : OwningObject(nullptr) { }
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RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
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bool operator==(const RelocationRef &Other) const;
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void moveNext();
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std::error_code getAddress(uint64_t &Result) const;
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std::error_code getOffset(uint64_t &Result) const;
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symbol_iterator getSymbol() const;
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std::error_code getType(uint64_t &Result) const;
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/// @brief Indicates whether this relocation should hidden when listing
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/// relocations, usually because it is the trailing part of a multipart
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/// relocation that will be printed as part of the leading relocation.
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std::error_code getHidden(bool &Result) const;
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/// @brief Get a string that represents the type of this relocation.
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///
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/// This is for display purposes only.
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std::error_code getTypeName(SmallVectorImpl<char> &Result) const;
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/// @brief Get a string that represents the calculation of the value of this
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/// relocation.
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///
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/// This is for display purposes only.
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std::error_code getValueString(SmallVectorImpl<char> &Result) const;
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DataRefImpl getRawDataRefImpl() const;
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const ObjectFile *getObjectFile() const;
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};
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typedef content_iterator<RelocationRef> relocation_iterator;
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/// SectionRef - This is a value type class that represents a single section in
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/// the list of sections in the object file.
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class SectionRef;
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typedef content_iterator<SectionRef> section_iterator;
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class SectionRef {
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friend class SymbolRef;
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DataRefImpl SectionPimpl;
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const ObjectFile *OwningObject;
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public:
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SectionRef() : OwningObject(nullptr) { }
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SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
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bool operator==(const SectionRef &Other) const;
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bool operator!=(const SectionRef &Other) const;
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bool operator<(const SectionRef &Other) const;
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void moveNext();
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std::error_code getName(StringRef &Result) const;
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uint64_t getAddress() const;
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uint64_t getSize() const;
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std::error_code getContents(StringRef &Result) const;
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/// @brief Get the alignment of this section as the actual value (not log 2).
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uint64_t getAlignment() const;
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bool isText() const;
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bool isData() const;
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bool isBSS() const;
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bool isRequiredForExecution() const;
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bool isVirtual() const;
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bool isZeroInit() const;
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bool isReadOnlyData() const;
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bool containsSymbol(SymbolRef S) const;
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relocation_iterator relocation_begin() const;
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relocation_iterator relocation_end() const;
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iterator_range<relocation_iterator> relocations() const {
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return iterator_range<relocation_iterator>(relocation_begin(),
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relocation_end());
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}
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section_iterator getRelocatedSection() const;
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DataRefImpl getRawDataRefImpl() const;
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};
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/// SymbolRef - This is a value type class that represents a single symbol in
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/// the list of symbols in the object file.
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class SymbolRef : public BasicSymbolRef {
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friend class SectionRef;
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public:
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SymbolRef() : BasicSymbolRef() {}
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enum Type {
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ST_Unknown, // Type not specified
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ST_Data,
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ST_Debug,
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ST_File,
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ST_Function,
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ST_Other
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};
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SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
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std::error_code getName(StringRef &Result) const;
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/// Returns the symbol virtual address (i.e. address at which it will be
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/// mapped).
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std::error_code getAddress(uint64_t &Result) const;
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/// @brief Get the alignment of this symbol as the actual value (not log 2).
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std::error_code getAlignment(uint32_t &Result) const;
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std::error_code getSize(uint64_t &Result) const;
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std::error_code getType(SymbolRef::Type &Result) const;
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std::error_code getOther(uint8_t &Result) const;
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/// @brief Get section this symbol is defined in reference to. Result is
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/// end_sections() if it is undefined or is an absolute symbol.
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std::error_code getSection(section_iterator &Result) const;
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const ObjectFile *getObject() const;
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};
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class symbol_iterator : public basic_symbol_iterator {
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public:
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symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {}
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symbol_iterator(const basic_symbol_iterator &B)
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: basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
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cast<ObjectFile>(B->getObject()))) {}
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const SymbolRef *operator->() const {
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const BasicSymbolRef &P = basic_symbol_iterator::operator *();
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return static_cast<const SymbolRef*>(&P);
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}
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const SymbolRef &operator*() const {
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const BasicSymbolRef &P = basic_symbol_iterator::operator *();
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return static_cast<const SymbolRef&>(P);
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}
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};
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/// ObjectFile - This class is the base class for all object file types.
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/// Concrete instances of this object are created by createObjectFile, which
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/// figures out which type to create.
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class ObjectFile : public SymbolicFile {
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virtual void anchor();
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ObjectFile() LLVM_DELETED_FUNCTION;
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ObjectFile(const ObjectFile &other) LLVM_DELETED_FUNCTION;
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protected:
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ObjectFile(unsigned int Type, MemoryBufferRef Source);
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const uint8_t *base() const {
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return reinterpret_cast<const uint8_t *>(Data.getBufferStart());
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}
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// These functions are for SymbolRef to call internally. The main goal of
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// this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
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// entry in the memory mapped object file. SymbolPimpl cannot contain any
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// virtual functions because then it could not point into the memory mapped
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// file.
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//
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// Implementations assume that the DataRefImpl is valid and has not been
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// modified externally. It's UB otherwise.
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friend class SymbolRef;
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virtual std::error_code getSymbolName(DataRefImpl Symb,
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StringRef &Res) const = 0;
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std::error_code printSymbolName(raw_ostream &OS,
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DataRefImpl Symb) const override;
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virtual std::error_code getSymbolAddress(DataRefImpl Symb,
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uint64_t &Res) const = 0;
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virtual std::error_code getSymbolAlignment(DataRefImpl Symb,
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uint32_t &Res) const;
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virtual std::error_code getSymbolSize(DataRefImpl Symb,
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uint64_t &Res) const = 0;
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virtual std::error_code getSymbolType(DataRefImpl Symb,
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SymbolRef::Type &Res) const = 0;
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virtual std::error_code getSymbolSection(DataRefImpl Symb,
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section_iterator &Res) const = 0;
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virtual std::error_code getSymbolOther(DataRefImpl Symb,
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uint8_t &Res) const {
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return object_error::invalid_file_type;
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}
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// Same as above for SectionRef.
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friend class SectionRef;
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virtual void moveSectionNext(DataRefImpl &Sec) const = 0;
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virtual std::error_code getSectionName(DataRefImpl Sec,
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StringRef &Res) const = 0;
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virtual uint64_t getSectionAddress(DataRefImpl Sec) const = 0;
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virtual uint64_t getSectionSize(DataRefImpl Sec) const = 0;
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virtual std::error_code getSectionContents(DataRefImpl Sec,
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StringRef &Res) const = 0;
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virtual uint64_t getSectionAlignment(DataRefImpl Sec) const = 0;
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virtual bool isSectionText(DataRefImpl Sec) const = 0;
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virtual bool isSectionData(DataRefImpl Sec) const = 0;
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virtual bool isSectionBSS(DataRefImpl Sec) const = 0;
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virtual bool isSectionRequiredForExecution(DataRefImpl Sec) const = 0;
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// A section is 'virtual' if its contents aren't present in the object image.
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virtual bool isSectionVirtual(DataRefImpl Sec) const = 0;
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virtual bool isSectionZeroInit(DataRefImpl Sec) const = 0;
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virtual bool isSectionReadOnlyData(DataRefImpl Sec) const = 0;
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virtual bool sectionContainsSymbol(DataRefImpl Sec,
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DataRefImpl Symb) const = 0;
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virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0;
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virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0;
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virtual section_iterator getRelocatedSection(DataRefImpl Sec) const;
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// Same as above for RelocationRef.
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friend class RelocationRef;
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virtual void moveRelocationNext(DataRefImpl &Rel) const = 0;
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virtual std::error_code getRelocationAddress(DataRefImpl Rel,
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uint64_t &Res) const = 0;
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virtual std::error_code getRelocationOffset(DataRefImpl Rel,
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uint64_t &Res) const = 0;
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virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
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virtual std::error_code getRelocationType(DataRefImpl Rel,
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uint64_t &Res) const = 0;
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virtual std::error_code
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getRelocationTypeName(DataRefImpl Rel,
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SmallVectorImpl<char> &Result) const = 0;
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virtual std::error_code
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getRelocationValueString(DataRefImpl Rel,
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SmallVectorImpl<char> &Result) const = 0;
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virtual std::error_code getRelocationHidden(DataRefImpl Rel,
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bool &Result) const {
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Result = false;
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return object_error::success;
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}
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public:
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typedef iterator_range<symbol_iterator> symbol_iterator_range;
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symbol_iterator_range symbols() const {
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return symbol_iterator_range(symbol_begin(), symbol_end());
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}
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virtual section_iterator section_begin() const = 0;
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virtual section_iterator section_end() const = 0;
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typedef iterator_range<section_iterator> section_iterator_range;
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section_iterator_range sections() const {
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return section_iterator_range(section_begin(), section_end());
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}
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/// @brief The number of bytes used to represent an address in this object
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/// file format.
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virtual uint8_t getBytesInAddress() const = 0;
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virtual StringRef getFileFormatName() const = 0;
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virtual /* Triple::ArchType */ unsigned getArch() const = 0;
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/// Returns platform-specific object flags, if any.
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virtual std::error_code getPlatformFlags(unsigned &Result) const {
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Result = 0;
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return object_error::invalid_file_type;
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}
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/// True if this is a relocatable object (.o/.obj).
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virtual bool isRelocatableObject() const = 0;
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/// @returns Pointer to ObjectFile subclass to handle this type of object.
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/// @param ObjectPath The path to the object file. ObjectPath.isObject must
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/// return true.
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/// @brief Create ObjectFile from path.
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static ErrorOr<OwningBinary<ObjectFile>>
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createObjectFile(StringRef ObjectPath);
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static ErrorOr<std::unique_ptr<ObjectFile>>
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createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type);
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static ErrorOr<std::unique_ptr<ObjectFile>>
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createObjectFile(MemoryBufferRef Object) {
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return createObjectFile(Object, sys::fs::file_magic::unknown);
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}
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static inline bool classof(const Binary *v) {
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return v->isObject();
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}
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static ErrorOr<std::unique_ptr<COFFObjectFile>>
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createCOFFObjectFile(MemoryBufferRef Object);
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static ErrorOr<std::unique_ptr<ObjectFile>>
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createELFObjectFile(MemoryBufferRef Object);
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static ErrorOr<std::unique_ptr<MachOObjectFile>>
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createMachOObjectFile(MemoryBufferRef Object);
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};
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// Inline function definitions.
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inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
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: BasicSymbolRef(SymbolP, Owner) {}
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inline std::error_code SymbolRef::getName(StringRef &Result) const {
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return getObject()->getSymbolName(getRawDataRefImpl(), Result);
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}
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inline std::error_code SymbolRef::getAddress(uint64_t &Result) const {
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return getObject()->getSymbolAddress(getRawDataRefImpl(), Result);
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}
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inline std::error_code SymbolRef::getAlignment(uint32_t &Result) const {
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return getObject()->getSymbolAlignment(getRawDataRefImpl(), Result);
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}
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inline std::error_code SymbolRef::getSize(uint64_t &Result) const {
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return getObject()->getSymbolSize(getRawDataRefImpl(), Result);
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}
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inline std::error_code SymbolRef::getSection(section_iterator &Result) const {
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return getObject()->getSymbolSection(getRawDataRefImpl(), Result);
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}
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inline std::error_code SymbolRef::getType(SymbolRef::Type &Result) const {
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return getObject()->getSymbolType(getRawDataRefImpl(), Result);
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}
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inline std::error_code SymbolRef::getOther(uint8_t &Result) const {
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return getObject()->getSymbolOther(getRawDataRefImpl(), Result);
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}
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inline const ObjectFile *SymbolRef::getObject() const {
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const SymbolicFile *O = BasicSymbolRef::getObject();
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return cast<ObjectFile>(O);
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}
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/// SectionRef
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inline SectionRef::SectionRef(DataRefImpl SectionP,
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const ObjectFile *Owner)
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: SectionPimpl(SectionP)
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, OwningObject(Owner) {}
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inline bool SectionRef::operator==(const SectionRef &Other) const {
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return SectionPimpl == Other.SectionPimpl;
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}
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inline bool SectionRef::operator!=(const SectionRef &Other) const {
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return SectionPimpl != Other.SectionPimpl;
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}
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inline bool SectionRef::operator<(const SectionRef &Other) const {
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return SectionPimpl < Other.SectionPimpl;
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}
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inline void SectionRef::moveNext() {
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return OwningObject->moveSectionNext(SectionPimpl);
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}
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inline std::error_code SectionRef::getName(StringRef &Result) const {
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return OwningObject->getSectionName(SectionPimpl, Result);
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}
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inline uint64_t SectionRef::getAddress() const {
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return OwningObject->getSectionAddress(SectionPimpl);
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}
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inline uint64_t SectionRef::getSize() const {
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return OwningObject->getSectionSize(SectionPimpl);
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}
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inline std::error_code SectionRef::getContents(StringRef &Result) const {
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return OwningObject->getSectionContents(SectionPimpl, Result);
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}
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inline uint64_t SectionRef::getAlignment() const {
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return OwningObject->getSectionAlignment(SectionPimpl);
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}
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inline bool SectionRef::isText() const {
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return OwningObject->isSectionText(SectionPimpl);
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}
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inline bool SectionRef::isData() const {
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return OwningObject->isSectionData(SectionPimpl);
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}
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inline bool SectionRef::isBSS() const {
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return OwningObject->isSectionBSS(SectionPimpl);
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}
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inline bool SectionRef::isRequiredForExecution() const {
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return OwningObject->isSectionRequiredForExecution(SectionPimpl);
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}
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inline bool SectionRef::isVirtual() const {
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return OwningObject->isSectionVirtual(SectionPimpl);
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}
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inline bool SectionRef::isZeroInit() const {
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return OwningObject->isSectionZeroInit(SectionPimpl);
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}
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inline bool SectionRef::isReadOnlyData() const {
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return OwningObject->isSectionReadOnlyData(SectionPimpl);
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}
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inline bool SectionRef::containsSymbol(SymbolRef S) const {
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return OwningObject->sectionContainsSymbol(SectionPimpl,
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S.getRawDataRefImpl());
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}
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inline relocation_iterator SectionRef::relocation_begin() const {
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return OwningObject->section_rel_begin(SectionPimpl);
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}
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inline relocation_iterator SectionRef::relocation_end() const {
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return OwningObject->section_rel_end(SectionPimpl);
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}
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inline section_iterator SectionRef::getRelocatedSection() const {
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return OwningObject->getRelocatedSection(SectionPimpl);
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}
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inline DataRefImpl SectionRef::getRawDataRefImpl() const {
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return SectionPimpl;
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}
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/// RelocationRef
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inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
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const ObjectFile *Owner)
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: RelocationPimpl(RelocationP)
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, OwningObject(Owner) {}
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inline bool RelocationRef::operator==(const RelocationRef &Other) const {
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return RelocationPimpl == Other.RelocationPimpl;
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}
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inline void RelocationRef::moveNext() {
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return OwningObject->moveRelocationNext(RelocationPimpl);
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}
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inline std::error_code RelocationRef::getAddress(uint64_t &Result) const {
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return OwningObject->getRelocationAddress(RelocationPimpl, Result);
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}
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inline std::error_code RelocationRef::getOffset(uint64_t &Result) const {
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return OwningObject->getRelocationOffset(RelocationPimpl, Result);
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}
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inline symbol_iterator RelocationRef::getSymbol() const {
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return OwningObject->getRelocationSymbol(RelocationPimpl);
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}
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inline std::error_code RelocationRef::getType(uint64_t &Result) const {
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return OwningObject->getRelocationType(RelocationPimpl, Result);
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}
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inline std::error_code
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RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const {
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return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
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}
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inline std::error_code
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RelocationRef::getValueString(SmallVectorImpl<char> &Result) const {
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return OwningObject->getRelocationValueString(RelocationPimpl, Result);
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}
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inline std::error_code RelocationRef::getHidden(bool &Result) const {
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return OwningObject->getRelocationHidden(RelocationPimpl, Result);
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}
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inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
|
|
return RelocationPimpl;
|
|
}
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|
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inline const ObjectFile *RelocationRef::getObjectFile() const {
|
|
return OwningObject;
|
|
}
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} // end namespace object
|
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} // end namespace llvm
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#endif
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