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59a0e79631
For regular object files this is only meaningful for common symbols. An object file format with direct support for atoms should be able to provide alignment information for all symbols. This replaces getCommonSymbolAlignment and fixes test-common-symbols-alignment.ll on darwin. This also includes a fix to MachOObjectFile::getSymbolFlags. It was marking undefined symbols as common (already tested by existing mcjit tests now that it is used). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180736 91177308-0d34-0410-b5e6-96231b3b80d8
624 lines
21 KiB
C++
624 lines
21 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/Binary.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/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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union DataRefImpl {
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struct {
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// ELF needs this for relocations. This entire union should probably be a
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// char[max(8, sizeof(uintptr_t))] and require the impl to cast.
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uint16_t a, b;
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uint32_t c;
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} w;
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struct {
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uint32_t a, b;
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} d;
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uintptr_t p;
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DataRefImpl() {
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std::memset(this, 0, sizeof(DataRefImpl));
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}
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};
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template<class content_type>
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class content_iterator {
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content_type Current;
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public:
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content_iterator(content_type symb)
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: Current(symb) {}
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const content_type* operator->() const {
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return &Current;
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}
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const content_type &operator*() const {
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return Current;
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}
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bool operator==(const content_iterator &other) const {
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return Current == other.Current;
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}
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bool operator!=(const content_iterator &other) const {
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return !(*this == other);
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}
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content_iterator& increment(error_code &err) {
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content_type next;
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if (error_code ec = Current.getNext(next))
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err = ec;
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else
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Current = next;
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return *this;
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}
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};
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inline bool operator==(const DataRefImpl &a, const DataRefImpl &b) {
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// Check bitwise identical. This is the only legal way to compare a union w/o
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// knowing which member is in use.
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return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
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}
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inline bool operator<(const DataRefImpl &a, const DataRefImpl &b) {
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// Check bitwise identical. This is the only legal way to compare a union w/o
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// knowing which member is in use.
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return std::memcmp(&a, &b, sizeof(DataRefImpl)) < 0;
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}
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class SymbolRef;
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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(NULL) { }
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RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
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bool operator==(const RelocationRef &Other) const;
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error_code getNext(RelocationRef &Result) const;
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error_code getAddress(uint64_t &Result) const;
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error_code getOffset(uint64_t &Result) const;
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error_code getSymbol(SymbolRef &Result) const;
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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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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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error_code getTypeName(SmallVectorImpl<char> &Result) const;
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error_code getAdditionalInfo(int64_t &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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error_code getValueString(SmallVectorImpl<char> &Result) const;
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DataRefImpl getRawDataRefImpl() 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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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(NULL) { }
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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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error_code getNext(SectionRef &Result) const;
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error_code getName(StringRef &Result) const;
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error_code getAddress(uint64_t &Result) const;
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error_code getSize(uint64_t &Result) const;
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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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error_code getAlignment(uint64_t &Result) const;
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// FIXME: Move to the normalization layer when it's created.
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error_code isText(bool &Result) const;
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error_code isData(bool &Result) const;
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error_code isBSS(bool &Result) const;
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error_code isRequiredForExecution(bool &Result) const;
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error_code isVirtual(bool &Result) const;
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error_code isZeroInit(bool &Result) const;
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error_code isReadOnlyData(bool &Result) const;
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error_code containsSymbol(SymbolRef S, bool &Result) const;
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relocation_iterator begin_relocations() const;
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relocation_iterator end_relocations() const;
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DataRefImpl getRawDataRefImpl() const;
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};
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typedef content_iterator<SectionRef> section_iterator;
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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 {
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friend class SectionRef;
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DataRefImpl SymbolPimpl;
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const ObjectFile *OwningObject;
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public:
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SymbolRef() : OwningObject(NULL) { }
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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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enum Flags {
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SF_None = 0,
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SF_Undefined = 1U << 0, // Symbol is defined in another object file
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SF_Global = 1U << 1, // Global symbol
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SF_Weak = 1U << 2, // Weak symbol
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SF_Absolute = 1U << 3, // Absolute symbol
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SF_ThreadLocal = 1U << 4, // Thread local symbol
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SF_Common = 1U << 5, // Symbol has common linkage
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SF_FormatSpecific = 1U << 31 // Specific to the object file format
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// (e.g. section symbols)
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};
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SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
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bool operator==(const SymbolRef &Other) const;
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bool operator<(const SymbolRef &Other) const;
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error_code getNext(SymbolRef &Result) const;
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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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error_code getAddress(uint64_t &Result) const;
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error_code getFileOffset(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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error_code getAlignment(uint32_t &Result) const;
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error_code getSize(uint64_t &Result) const;
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error_code getType(SymbolRef::Type &Result) const;
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/// Returns the ascii char that should be displayed in a symbol table dump via
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/// nm for this symbol.
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error_code getNMTypeChar(char &Result) const;
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/// Get symbol flags (bitwise OR of SymbolRef::Flags)
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error_code getFlags(uint32_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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error_code getSection(section_iterator &Result) const;
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/// @brief Get value of the symbol in the symbol table.
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error_code getValue(uint64_t &Val) const;
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DataRefImpl getRawDataRefImpl() const;
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};
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typedef content_iterator<SymbolRef> symbol_iterator;
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/// LibraryRef - This is a value type class that represents a single library in
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/// the list of libraries needed by a shared or dynamic object.
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class LibraryRef {
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friend class SectionRef;
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DataRefImpl LibraryPimpl;
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const ObjectFile *OwningObject;
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public:
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LibraryRef() : OwningObject(NULL) { }
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LibraryRef(DataRefImpl LibraryP, const ObjectFile *Owner);
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bool operator==(const LibraryRef &Other) const;
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bool operator<(const LibraryRef &Other) const;
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error_code getNext(LibraryRef &Result) const;
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// Get the path to this library, as stored in the object file.
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error_code getPath(StringRef &Result) const;
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DataRefImpl getRawDataRefImpl() const;
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};
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typedef content_iterator<LibraryRef> library_iterator;
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const uint64_t UnknownAddressOrSize = ~0ULL;
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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 Binary {
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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, MemoryBuffer *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 error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const = 0;
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virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const = 0;
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virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const = 0;
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virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res)const=0;
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virtual error_code getSymbolAlignment(DataRefImpl Symb, uint32_t &Res) const;
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virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const = 0;
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virtual error_code getSymbolType(DataRefImpl Symb,
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SymbolRef::Type &Res) const = 0;
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virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const = 0;
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virtual error_code getSymbolFlags(DataRefImpl Symb,
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uint32_t &Res) const = 0;
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virtual error_code getSymbolSection(DataRefImpl Symb,
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section_iterator &Res) const = 0;
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virtual error_code getSymbolValue(DataRefImpl Symb, uint64_t &Val) const = 0;
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// Same as above for SectionRef.
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friend class SectionRef;
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virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const = 0;
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virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const = 0;
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virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const =0;
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virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const = 0;
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virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res)const=0;
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virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res)const=0;
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virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
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bool &Res) 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 error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const =0;
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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bool &Result) const = 0;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
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virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const = 0;
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// Same as above for RelocationRef.
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friend class RelocationRef;
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virtual error_code getRelocationNext(DataRefImpl Rel,
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RelocationRef &Res) const = 0;
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virtual error_code getRelocationAddress(DataRefImpl Rel,
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uint64_t &Res) const =0;
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virtual error_code getRelocationOffset(DataRefImpl Rel,
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uint64_t &Res) const =0;
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virtual error_code getRelocationSymbol(DataRefImpl Rel,
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SymbolRef &Res) const = 0;
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virtual error_code getRelocationType(DataRefImpl Rel,
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uint64_t &Res) const = 0;
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virtual error_code getRelocationTypeName(DataRefImpl Rel,
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SmallVectorImpl<char> &Result) const = 0;
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virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
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int64_t &Res) const = 0;
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virtual error_code getRelocationValueString(DataRefImpl Rel,
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SmallVectorImpl<char> &Result) const = 0;
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virtual error_code getRelocationHidden(DataRefImpl Rel, 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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// Same for LibraryRef
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friend class LibraryRef;
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virtual error_code getLibraryNext(DataRefImpl Lib, LibraryRef &Res) const = 0;
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virtual error_code getLibraryPath(DataRefImpl Lib, StringRef &Res) const = 0;
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public:
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virtual symbol_iterator begin_symbols() const = 0;
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virtual symbol_iterator end_symbols() const = 0;
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virtual symbol_iterator begin_dynamic_symbols() const = 0;
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virtual symbol_iterator end_dynamic_symbols() const = 0;
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virtual section_iterator begin_sections() const = 0;
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virtual section_iterator end_sections() const = 0;
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virtual library_iterator begin_libraries_needed() const = 0;
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virtual library_iterator end_libraries_needed() const = 0;
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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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/// For shared objects, returns the name which this object should be
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/// loaded from at runtime. This corresponds to DT_SONAME on ELF and
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/// LC_ID_DYLIB (install name) on MachO.
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virtual StringRef getLoadName() 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 ObjectFile *createObjectFile(StringRef ObjectPath);
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static ObjectFile *createObjectFile(MemoryBuffer *Object);
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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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public:
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static ObjectFile *createCOFFObjectFile(MemoryBuffer *Object);
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static ObjectFile *createELFObjectFile(MemoryBuffer *Object);
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static ObjectFile *createMachOObjectFile(MemoryBuffer *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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: SymbolPimpl(SymbolP)
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, OwningObject(Owner) {}
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inline bool SymbolRef::operator==(const SymbolRef &Other) const {
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return SymbolPimpl == Other.SymbolPimpl;
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}
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inline bool SymbolRef::operator<(const SymbolRef &Other) const {
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return SymbolPimpl < Other.SymbolPimpl;
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}
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inline error_code SymbolRef::getNext(SymbolRef &Result) const {
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return OwningObject->getSymbolNext(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getName(StringRef &Result) const {
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return OwningObject->getSymbolName(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getAddress(uint64_t &Result) const {
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return OwningObject->getSymbolAddress(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getFileOffset(uint64_t &Result) const {
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return OwningObject->getSymbolFileOffset(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getAlignment(uint32_t &Result) const {
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return OwningObject->getSymbolAlignment(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getSize(uint64_t &Result) const {
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return OwningObject->getSymbolSize(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getNMTypeChar(char &Result) const {
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return OwningObject->getSymbolNMTypeChar(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getFlags(uint32_t &Result) const {
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return OwningObject->getSymbolFlags(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getSection(section_iterator &Result) const {
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return OwningObject->getSymbolSection(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getType(SymbolRef::Type &Result) const {
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return OwningObject->getSymbolType(SymbolPimpl, Result);
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}
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inline error_code SymbolRef::getValue(uint64_t &Val) const {
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return OwningObject->getSymbolValue(SymbolPimpl, Val);
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}
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inline DataRefImpl SymbolRef::getRawDataRefImpl() const {
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return SymbolPimpl;
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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 error_code SectionRef::getNext(SectionRef &Result) const {
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return OwningObject->getSectionNext(SectionPimpl, Result);
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}
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inline 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 error_code SectionRef::getAddress(uint64_t &Result) const {
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return OwningObject->getSectionAddress(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::getSize(uint64_t &Result) const {
|
|
return OwningObject->getSectionSize(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::getContents(StringRef &Result) const {
|
|
return OwningObject->getSectionContents(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::getAlignment(uint64_t &Result) const {
|
|
return OwningObject->getSectionAlignment(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isText(bool &Result) const {
|
|
return OwningObject->isSectionText(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isData(bool &Result) const {
|
|
return OwningObject->isSectionData(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isBSS(bool &Result) const {
|
|
return OwningObject->isSectionBSS(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isRequiredForExecution(bool &Result) const {
|
|
return OwningObject->isSectionRequiredForExecution(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isVirtual(bool &Result) const {
|
|
return OwningObject->isSectionVirtual(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isZeroInit(bool &Result) const {
|
|
return OwningObject->isSectionZeroInit(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::isReadOnlyData(bool &Result) const {
|
|
return OwningObject->isSectionReadOnlyData(SectionPimpl, Result);
|
|
}
|
|
|
|
inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
|
|
return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
|
|
Result);
|
|
}
|
|
|
|
inline relocation_iterator SectionRef::begin_relocations() const {
|
|
return OwningObject->getSectionRelBegin(SectionPimpl);
|
|
}
|
|
|
|
inline relocation_iterator SectionRef::end_relocations() const {
|
|
return OwningObject->getSectionRelEnd(SectionPimpl);
|
|
}
|
|
|
|
inline DataRefImpl SectionRef::getRawDataRefImpl() const {
|
|
return SectionPimpl;
|
|
}
|
|
|
|
/// RelocationRef
|
|
inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
|
|
const ObjectFile *Owner)
|
|
: RelocationPimpl(RelocationP)
|
|
, OwningObject(Owner) {}
|
|
|
|
inline bool RelocationRef::operator==(const RelocationRef &Other) const {
|
|
return RelocationPimpl == Other.RelocationPimpl;
|
|
}
|
|
|
|
inline error_code RelocationRef::getNext(RelocationRef &Result) const {
|
|
return OwningObject->getRelocationNext(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getAddress(uint64_t &Result) const {
|
|
return OwningObject->getRelocationAddress(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getOffset(uint64_t &Result) const {
|
|
return OwningObject->getRelocationOffset(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getSymbol(SymbolRef &Result) const {
|
|
return OwningObject->getRelocationSymbol(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getType(uint64_t &Result) const {
|
|
return OwningObject->getRelocationType(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getTypeName(SmallVectorImpl<char> &Result)
|
|
const {
|
|
return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getAdditionalInfo(int64_t &Result) const {
|
|
return OwningObject->getRelocationAdditionalInfo(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getValueString(SmallVectorImpl<char> &Result)
|
|
const {
|
|
return OwningObject->getRelocationValueString(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline error_code RelocationRef::getHidden(bool &Result) const {
|
|
return OwningObject->getRelocationHidden(RelocationPimpl, Result);
|
|
}
|
|
|
|
inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
|
|
return RelocationPimpl;
|
|
}
|
|
|
|
// Inline function definitions.
|
|
inline LibraryRef::LibraryRef(DataRefImpl LibraryP, const ObjectFile *Owner)
|
|
: LibraryPimpl(LibraryP)
|
|
, OwningObject(Owner) {}
|
|
|
|
inline bool LibraryRef::operator==(const LibraryRef &Other) const {
|
|
return LibraryPimpl == Other.LibraryPimpl;
|
|
}
|
|
|
|
inline bool LibraryRef::operator<(const LibraryRef &Other) const {
|
|
return LibraryPimpl < Other.LibraryPimpl;
|
|
}
|
|
|
|
inline error_code LibraryRef::getNext(LibraryRef &Result) const {
|
|
return OwningObject->getLibraryNext(LibraryPimpl, Result);
|
|
}
|
|
|
|
inline error_code LibraryRef::getPath(StringRef &Result) const {
|
|
return OwningObject->getLibraryPath(LibraryPimpl, Result);
|
|
}
|
|
|
|
} // end namespace object
|
|
} // end namespace llvm
|
|
|
|
#endif
|