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macho_relocatable_file.cpp
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/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
* Copyright (c) 2009-2010 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "MachOFileAbstraction.hpp"
#include "libunwind/DwarfInstructions.hpp"
#include "libunwind/AddressSpace.hpp"
#include "libunwind/Registers.hpp"
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include "dwarf2.h"
#include "debugline.h"
#include "Architectures.hpp"
#include "ld.hpp"
#include "macho_relocatable_file.h"
extern void throwf(const char* format, ...) __attribute__ ((noreturn,format(printf, 1, 2)));
extern void warning(const char* format, ...) __attribute__((format(printf, 1, 2)));
namespace mach_o {
namespace relocatable {
// forward reference
template <typename A> class Parser;
template <typename A> class Atom;
template <typename A> class Section;
template <typename A> class CFISection;
template <typename A> class CUSection;
template <typename A>
class File : public ld::relocatable::File
{
public:
File(const char* p, time_t mTime, const uint8_t* content, ld::File::Ordinal ord) :
ld::relocatable::File(p,mTime,ord), _fileContent(content),
_sectionsArray(NULL), _atomsArray(NULL),
_sectionsArrayCount(0), _atomsArrayCount(0),
_debugInfoKind(ld::relocatable::File::kDebugInfoNone),
_dwarfTranslationUnitPath(NULL),
_dwarfDebugInfoSect(NULL), _dwarfDebugAbbrevSect(NULL),
_dwarfDebugLineSect(NULL), _dwarfDebugStringSect(NULL),
_objConstraint(ld::File::objcConstraintNone),
_cpuSubType(0),
_canScatterAtoms(false) {}
virtual ~File();
// overrides of ld::File
virtual bool forEachAtom(ld::File::AtomHandler&) const;
virtual bool justInTimeforEachAtom(const char* name, ld::File::AtomHandler&) const
{ return false; }
// overrides of ld::relocatable::File
virtual ObjcConstraint objCConstraint() const { return _objConstraint; }
virtual uint32_t cpuSubType() const { return _cpuSubType; }
virtual DebugInfoKind debugInfo() const { return _debugInfoKind; }
virtual const std::vector<ld::relocatable::File::Stab>* stabs() const { return &_stabs; }
virtual bool canScatterAtoms() const { return _canScatterAtoms; }
virtual const char* translationUnitSource() const;
virtual LinkerOptionsList* linkerOptions() const { return &_linkerOptions; }
const uint8_t* fileContent() { return _fileContent; }
private:
friend class Atom<A>;
friend class Section<A>;
friend class Parser<A>;
friend class CFISection<A>::OAS;
typedef typename A::P P;
const uint8_t* _fileContent;
Section<A>** _sectionsArray;
uint8_t* _atomsArray;
uint32_t _sectionsArrayCount;
uint32_t _atomsArrayCount;
std::vector<ld::Fixup> _fixups;
std::vector<ld::Atom::UnwindInfo> _unwindInfos;
std::vector<ld::Atom::LineInfo> _lineInfos;
std::vector<ld::relocatable::File::Stab>_stabs;
ld::relocatable::File::DebugInfoKind _debugInfoKind;
const char* _dwarfTranslationUnitPath;
const macho_section<P>* _dwarfDebugInfoSect;
const macho_section<P>* _dwarfDebugAbbrevSect;
const macho_section<P>* _dwarfDebugLineSect;
const macho_section<P>* _dwarfDebugStringSect;
ld::File::ObjcConstraint _objConstraint;
uint32_t _cpuSubType;
bool _canScatterAtoms;
std::vector<std::vector<const char*> > _linkerOptions;
};
template <typename A>
class Section : public ld::Section
{
public:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
typedef typename A::P::E E;
virtual ~Section() { }
class File<A>& file() const { return _file; }
const macho_section<P>* machoSection() const { return _machOSection; }
uint32_t sectionNum(class Parser<A>&) const;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr);
virtual ld::Atom::ContentType contentType() { return ld::Atom::typeUnclassified; }
virtual bool dontDeadStrip() { return (this->_machOSection->flags() & S_ATTR_NO_DEAD_STRIP); }
virtual Atom<A>* findAtomByAddress(pint_t addr) { return this->findContentAtomByAddress(addr, this->_beginAtoms, this->_endAtoms); }
virtual bool addFollowOnFixups() const { return ! _file.canScatterAtoms(); }
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer,
struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&) = 0;
virtual uint32_t computeAtomCount(class Parser<A>& parser,
struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&) = 0;
virtual void makeFixups(class Parser<A>& parser, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual bool addRelocFixup(class Parser<A>& parser, const macho_relocation_info<P>*);
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const { return 0; }
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const { return false; }
virtual bool ignoreLabel(const char* label) const { return false; }
static const char* makeSectionName(const macho_section<typename A::P>* s);
protected:
Section(File<A>& f, const macho_section<typename A::P>* s)
: ld::Section(makeSegmentName(s), makeSectionName(s), sectionType(s)),
_file(f), _machOSection(s), _beginAtoms(NULL), _endAtoms(NULL), _hasAliases(false) { }
Section(File<A>& f, const char* segName, const char* sectName, ld::Section::Type t, bool hidden=false)
: ld::Section(segName, sectName, t, hidden), _file(f), _machOSection(NULL),
_beginAtoms(NULL), _endAtoms(NULL), _hasAliases(false) { }
Atom<A>* findContentAtomByAddress(pint_t addr, class Atom<A>* start, class Atom<A>* end);
uint32_t x86_64PcRelOffset(uint8_t r_type);
static const char* makeSegmentName(const macho_section<typename A::P>* s);
static bool readable(const macho_section<typename A::P>* s);
static bool writable(const macho_section<typename A::P>* s);
static bool exectuable(const macho_section<typename A::P>* s);
static ld::Section::Type sectionType(const macho_section<typename A::P>* s);
File<A>& _file;
const macho_section<P>* _machOSection;
class Atom<A>* _beginAtoms;
class Atom<A>* _endAtoms;
bool _hasAliases;
};
template <typename A>
class CFISection : public Section<A>
{
public:
CFISection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: Section<A>(f, s) { }
uint32_t cfiCount();
virtual ld::Atom::ContentType contentType() { return ld::Atom::typeCFI; }
virtual uint32_t computeAtomCount(class Parser<A>& parser, struct Parser<A>::LabelAndCFIBreakIterator& it, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer, struct Parser<A>::LabelAndCFIBreakIterator& it, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual void makeFixups(class Parser<A>& parser, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual bool addFollowOnFixups() const { return false; }
///
/// ObjectFileAddressSpace is used as a template parameter to UnwindCursor for parsing
/// dwarf CFI information in an object file.
///
class OAS
{
public:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
typedef typename A::P::E E;
typedef typename A::P::uint_t sint_t;
OAS(CFISection<A>& ehFrameSection, const uint8_t* ehFrameBuffer) :
_ehFrameSection(ehFrameSection),
_ehFrameContent(ehFrameBuffer),
_ehFrameStartAddr(ehFrameSection.machoSection()->addr()),
_ehFrameEndAddr(ehFrameSection.machoSection()->addr()+ehFrameSection.machoSection()->size()) {}
uint8_t get8(pint_t addr) { return *((uint8_t*)mappedAddress(addr)); }
uint16_t get16(pint_t addr) { return E::get16(*((uint16_t*)mappedAddress(addr))); }
uint32_t get32(pint_t addr) { return E::get32(*((uint32_t*)mappedAddress(addr))); }
uint64_t get64(pint_t addr) { return E::get64(*((uint64_t*)mappedAddress(addr))); }
pint_t getP(pint_t addr) { return P::getP(*((pint_t*)mappedAddress(addr))); }
uint64_t getULEB128(pint_t& addr, pint_t end);
int64_t getSLEB128(pint_t& addr, pint_t end);
pint_t getEncodedP(pint_t& addr, pint_t end, uint8_t encoding);
private:
const void* mappedAddress(pint_t addr);
CFISection<A>& _ehFrameSection;
const uint8_t* _ehFrameContent;
pint_t _ehFrameStartAddr;
pint_t _ehFrameEndAddr;
};
typedef typename A::P::uint_t pint_t;
typedef libunwind::CFI_Atom_Info<OAS> CFI_Atom_Info;
void cfiParse(class Parser<A>& parser, uint8_t* buffer, CFI_Atom_Info cfiArray[], uint32_t& cfiCount, const pint_t cuStarts[], uint32_t cuCount);
bool needsRelocating();
static bool bigEndian();
private:
void addCiePersonalityFixups(class Parser<A>& parser, const CFI_Atom_Info* cieInfo);
static void warnFunc(void* ref, uint64_t funcAddr, const char* msg);
};
template <typename A>
class CUSection : public Section<A>
{
public:
CUSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: Section<A>(f, s) { }
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
typedef typename A::P::E E;
virtual uint32_t computeAtomCount(class Parser<A>& parser, struct Parser<A>::LabelAndCFIBreakIterator& it, const struct Parser<A>::CFI_CU_InfoArrays&) { return 0; }
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer, struct Parser<A>::LabelAndCFIBreakIterator& it, const struct Parser<A>::CFI_CU_InfoArrays&) { return 0; }
virtual void makeFixups(class Parser<A>& parser, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual bool addFollowOnFixups() const { return false; }
struct Info {
pint_t functionStartAddress;
uint32_t functionSymbolIndex;
uint32_t rangeLength;
uint32_t compactUnwindInfo;
const char* personality;
pint_t lsdaAddress;
Atom<A>* function;
Atom<A>* lsda;
};
uint32_t count();
void parse(class Parser<A>& parser, uint32_t cnt, Info array[]);
static bool encodingMeansUseDwarf(compact_unwind_encoding_t enc);
private:
const char* personalityName(class Parser<A>& parser, const macho_relocation_info<P>* reloc);
static int infoSorter(const void* l, const void* r);
};
template <typename A>
class TentativeDefinitionSection : public Section<A>
{
public:
TentativeDefinitionSection(Parser<A>& parser, File<A>& f)
: Section<A>(f, "__DATA", "__comm/tent", ld::Section::typeTentativeDefs) {}
virtual ld::Atom::ContentType contentType() { return ld::Atom::typeZeroFill; }
virtual bool addFollowOnFixups() const { return false; }
virtual Atom<A>* findAtomByAddress(typename A::P::uint_t addr) { throw "TentativeDefinitionSection::findAtomByAddress() should never be called"; }
virtual uint32_t computeAtomCount(class Parser<A>& parser, struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&);
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer,
struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&);
virtual void makeFixups(class Parser<A>& parser, const struct Parser<A>::CFI_CU_InfoArrays&) {}
private:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
};
template <typename A>
class AbsoluteSymbolSection : public Section<A>
{
public:
AbsoluteSymbolSection(Parser<A>& parser, File<A>& f)
: Section<A>(f, "__DATA", "__abs", ld::Section::typeAbsoluteSymbols, true) {}
virtual ld::Atom::ContentType contentType() { return ld::Atom::typeUnclassified; }
virtual bool dontDeadStrip() { return false; }
virtual ld::Atom::Alignment alignmentForAddress(typename A::P::uint_t addr) { return ld::Atom::Alignment(0); }
virtual bool addFollowOnFixups() const { return false; }
virtual Atom<A>* findAtomByAddress(typename A::P::uint_t addr) { throw "AbsoluteSymbolSection::findAtomByAddress() should never be called"; }
virtual uint32_t computeAtomCount(class Parser<A>& parser, struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&);
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer,
struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&);
virtual void makeFixups(class Parser<A>& parser, const struct Parser<A>::CFI_CU_InfoArrays&) {}
virtual Atom<A>* findAbsAtomForValue(typename A::P::uint_t);
private:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
};
template <typename A>
class SymboledSection : public Section<A>
{
public:
SymboledSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s);
virtual ld::Atom::ContentType contentType() { return _type; }
virtual bool dontDeadStrip();
virtual uint32_t computeAtomCount(class Parser<A>& parser, struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&);
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer,
struct Parser<A>::LabelAndCFIBreakIterator& it,
const struct Parser<A>::CFI_CU_InfoArrays&);
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
ld::Atom::ContentType _type;
};
template <typename A>
class TLVDefsSection : public SymboledSection<A>
{
public:
TLVDefsSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s) :
SymboledSection<A>(parser, f, s) { }
private:
};
template <typename A>
class ImplicitSizeSection : public Section<A>
{
public:
ImplicitSizeSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: Section<A>(f, s) { }
virtual uint32_t computeAtomCount(class Parser<A>& parser, struct Parser<A>::LabelAndCFIBreakIterator& it, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual uint32_t appendAtoms(class Parser<A>& parser, uint8_t* buffer, struct Parser<A>::LabelAndCFIBreakIterator& it, const struct Parser<A>::CFI_CU_InfoArrays&);
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual bool addFollowOnFixups() const { return false; }
virtual const char* unlabeledAtomName(Parser<A>& parser, pint_t addr) = 0;
virtual ld::Atom::SymbolTableInclusion symbolTableInclusion();
virtual pint_t elementSizeAtAddress(pint_t addr) = 0;
virtual ld::Atom::Scope scopeAtAddress(Parser<A>& parser, pint_t addr) { return ld::Atom::scopeLinkageUnit; }
virtual bool useElementAt(Parser<A>& parser,
struct Parser<A>::LabelAndCFIBreakIterator& it, pint_t addr) = 0;
virtual ld::Atom::Definition definition() { return ld::Atom::definitionRegular; }
virtual ld::Atom::Combine combine(Parser<A>& parser, pint_t addr) = 0;
virtual bool ignoreLabel(const char* label) const { return (label[0] == 'L'); }
};
template <typename A>
class FixedSizeSection : public ImplicitSizeSection<A>
{
public:
FixedSizeSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: ImplicitSizeSection<A>(parser, f, s) { }
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
typedef typename A::P::E E;
virtual bool useElementAt(Parser<A>& parser,
struct Parser<A>::LabelAndCFIBreakIterator& it, pint_t addr)
{ return true; }
};
template <typename A>
class Literal4Section : public FixedSizeSection<A>
{
public:
Literal4Section(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(2); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "4-byte-literal"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return 4; }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndContent; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class Literal8Section : public FixedSizeSection<A>
{
public:
Literal8Section(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(3); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "8-byte-literal"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return 8; }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndContent; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class Literal16Section : public FixedSizeSection<A>
{
public:
Literal16Section(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(4); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "16-byte-literal"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return 16; }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndContent; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class NonLazyPointerSection : public FixedSizeSection<A>
{
public:
NonLazyPointerSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual void makeFixups(class Parser<A>& parser, const struct Parser<A>::CFI_CU_InfoArrays&);
virtual ld::Atom::ContentType contentType() { return ld::Atom::typeNonLazyPointer; }
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(log2(sizeof(pint_t))); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "non_lazy_ptr"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return sizeof(pint_t); }
virtual ld::Atom::Scope scopeAtAddress(Parser<A>& parser, pint_t addr);
virtual ld::Atom::Combine combine(Parser<A>&, pint_t);
virtual bool ignoreLabel(const char* label) const { return true; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
private:
static const char* targetName(const class Atom<A>* atom, const ld::IndirectBindingTable& ind);
static ld::Fixup::Kind fixupKind();
};
template <typename A>
class CFStringSection : public FixedSizeSection<A>
{
public:
CFStringSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(log2(sizeof(pint_t))); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "CFString"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return 4*sizeof(pint_t); }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndReferences; }
virtual bool ignoreLabel(const char* label) const { return true; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
private:
enum ContentType { contentUTF8, contentUTF16, contentUnknown };
static const uint8_t* targetContent(const class Atom<A>* atom, const ld::IndirectBindingTable& ind,
ContentType* ct, unsigned int* count);
};
template <typename A>
class ObjC1ClassSection : public FixedSizeSection<A>
{
public:
ObjC1ClassSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
typedef typename A::P::E E;
virtual ld::Atom::Scope scopeAtAddress(Parser<A>& , pint_t ) { return ld::Atom::scopeGlobal; }
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(2); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t);
virtual ld::Atom::SymbolTableInclusion symbolTableInclusion() { return ld::Atom::symbolTableIn; }
virtual pint_t elementSizeAtAddress(pint_t addr);
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineNever; }
virtual bool ignoreLabel(const char* label) const { return true; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const
{ return 0; }
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const { return false; }
virtual bool addRelocFixup(class Parser<A>& parser, const macho_relocation_info<P>*);
};
template <typename A>
class ObjC2ClassRefsSection : public FixedSizeSection<A>
{
public:
ObjC2ClassRefsSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(log2(sizeof(pint_t))); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "objc-class-ref"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return sizeof(pint_t); }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndReferences; }
virtual bool ignoreLabel(const char* label) const { return true; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
private:
const char* targetClassName(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class ObjC2CategoryListSection : public FixedSizeSection<A>
{
public:
ObjC2CategoryListSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(log2(sizeof(pint_t))); }
virtual ld::Atom::Scope scopeAtAddress(Parser<A>& parser, pint_t addr) { return ld::Atom::scopeTranslationUnit; }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "objc-cat-list"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return sizeof(pint_t); }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineNever; }
virtual bool ignoreLabel(const char* label) const { return true; }
private:
const char* targetClassName(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class PointerToCStringSection : public FixedSizeSection<A>
{
public:
PointerToCStringSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: FixedSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
virtual ld::Atom::Alignment alignmentForAddress(pint_t addr) { return ld::Atom::Alignment(log2(sizeof(pint_t))); }
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "pointer-to-literal-cstring"; }
virtual pint_t elementSizeAtAddress(pint_t addr) { return sizeof(pint_t); }
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndReferences; }
virtual bool ignoreLabel(const char* label) const { return true; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
virtual const char* targetCString(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class Objc1ClassReferences : public PointerToCStringSection<A>
{
public:
Objc1ClassReferences(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: PointerToCStringSection<A>(parser, f, s) {}
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "pointer-to-literal-objc-class-name"; }
virtual bool addRelocFixup(class Parser<A>& parser, const macho_relocation_info<P>*);
virtual const char* targetCString(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class CStringSection : public ImplicitSizeSection<A>
{
public:
CStringSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: ImplicitSizeSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual ld::Atom::ContentType contentType() { return ld::Atom::typeCString; }
virtual Atom<A>* findAtomByAddress(pint_t addr);
virtual const char* unlabeledAtomName(Parser<A>&, pint_t) { return "cstring"; }
virtual pint_t elementSizeAtAddress(pint_t addr);
virtual bool ignoreLabel(const char* label) const;
virtual bool useElementAt(Parser<A>& parser,
struct Parser<A>::LabelAndCFIBreakIterator& it, pint_t addr);
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndContent; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
};
template <typename A>
class UTF16StringSection : public SymboledSection<A>
{
public:
UTF16StringSection(Parser<A>& parser, File<A>& f, const macho_section<typename A::P>* s)
: SymboledSection<A>(parser, f, s) {}
protected:
typedef typename A::P::uint_t pint_t;
typedef typename A::P P;
virtual ld::Atom::Combine combine(Parser<A>&, pint_t) { return ld::Atom::combineByNameAndContent; }
virtual unsigned long contentHash(const class Atom<A>* atom, const ld::IndirectBindingTable& ind) const;
virtual bool canCoalesceWith(const class Atom<A>* atom, const ld::Atom& rhs,
const ld::IndirectBindingTable& ind) const;
};
//
// Atoms in mach-o files
//
template <typename A>
class Atom : public ld::Atom
{
public:
// overrides of ld::Atom
virtual ld::File* file() const { return §().file(); }
virtual const char* translationUnitSource() const
{ return sect().file().translationUnitSource(); }
virtual const char* name() const { return _name; }
virtual uint64_t size() const { return _size; }
virtual uint64_t objectAddress() const { return _objAddress; }
virtual void copyRawContent(uint8_t buffer[]) const;
virtual const uint8_t* rawContentPointer() const { return contentPointer(); }
virtual unsigned long contentHash(const ld::IndirectBindingTable& ind) const
{ if ( _hash == 0 ) _hash = sect().contentHash(this, ind); return _hash; }
virtual bool canCoalesceWith(const ld::Atom& rhs, const ld::IndirectBindingTable& ind) const
{ return sect().canCoalesceWith(this, rhs, ind); }
virtual ld::Fixup::iterator fixupsBegin() const { return &machofile()._fixups[_fixupsStartIndex]; }
virtual ld::Fixup::iterator fixupsEnd() const { return &machofile()._fixups[_fixupsStartIndex+_fixupsCount]; }
virtual ld::Atom::UnwindInfo::iterator beginUnwind() const { return &machofile()._unwindInfos[_unwindInfoStartIndex]; }
virtual ld::Atom::UnwindInfo::iterator endUnwind() const { return &machofile()._unwindInfos[_unwindInfoStartIndex+_unwindInfoCount]; }
virtual ld::Atom::LineInfo::iterator beginLineInfo() const{ return &machofile()._lineInfos[_lineInfoStartIndex]; }
virtual ld::Atom::LineInfo::iterator endLineInfo() const { return &machofile()._lineInfos[_lineInfoStartIndex+_lineInfoCount]; }
private:
enum { kFixupStartIndexBits = 32,
kLineInfoStartIndexBits = 32,
kUnwindInfoStartIndexBits = 24,
kFixupCountBits = 24,
kLineInfoCountBits = 12,
kUnwindInfoCountBits = 4
}; // must sum to 128
public:
// methods for all atoms from mach-o object file
Section<A>& sect() const { return (Section<A>&)section(); }
File<A>& machofile() const { return ((Section<A>*)(this->_section))->file(); }
void setFixupsRange(uint32_t s, uint32_t c);
void setUnwindInfoRange(uint32_t s, uint32_t c);
void extendUnwindInfoRange();
void setLineInfoRange(uint32_t s, uint32_t c);
bool roomForMoreLineInfoCount() { return (_lineInfoCount < ((1<<kLineInfoCountBits)-1)); }
void incrementLineInfoCount() { assert(roomForMoreLineInfoCount()); ++_lineInfoCount; }
void incrementFixupCount() { if (_fixupsCount == ((1 << kFixupCountBits)-1))
throwf("too may fixups in %s", name()); ++_fixupsCount; }
const uint8_t* contentPointer() const;
uint32_t fixupCount() const { return _fixupsCount; }
void verifyAlignment() const;
typedef typename A::P P;
typedef typename A::P::E E;
typedef typename A::P::uint_t pint_t;
// constuct via all attributes
Atom(Section<A>& sct, const char* nm, pint_t addr, uint64_t sz,
ld::Atom::Definition d, ld::Atom::Combine c, ld::Atom::Scope s,
ld::Atom::ContentType ct, ld::Atom::SymbolTableInclusion i,
bool dds, bool thumb, bool al, ld::Atom::Alignment a)
: ld::Atom((ld::Section&)sct, d, c, s, ct, i, dds, thumb, al, a),
_size(sz), _objAddress(addr), _name(nm), _hash(0),
_fixupsStartIndex(0), _lineInfoStartIndex(0),
_unwindInfoStartIndex(0), _fixupsCount(0),
_lineInfoCount(0), _unwindInfoCount(0) { }
// construct via symbol table entry
Atom(Section<A>& sct, Parser<A>& parser, const macho_nlist<P>& sym,
uint64_t sz, bool alias=false)
: ld::Atom((ld::Section&)sct, parser.definitionFromSymbol(sym),
parser.combineFromSymbol(sym), parser.scopeFromSymbol(sym),
parser.resolverFromSymbol(sym) ? ld::Atom::typeResolver : sct.contentType(),
parser.inclusionFromSymbol(sym),
parser.dontDeadStripFromSymbol(sym) || sct.dontDeadStrip(),
parser.isThumbFromSymbol(sym), alias,
sct.alignmentForAddress(sym.n_value())),
_size(sz), _objAddress(sym.n_value()),
_name(parser.nameFromSymbol(sym)), _hash(0),
_fixupsStartIndex(0), _lineInfoStartIndex(0),
_unwindInfoStartIndex(0), _fixupsCount(0),
_lineInfoCount(0), _unwindInfoCount(0) {
// <rdar://problem/6783167> support auto-hidden weak symbols
if ( _scope == ld::Atom::scopeGlobal &&
(sym.n_desc() & (N_WEAK_DEF|N_WEAK_REF)) == (N_WEAK_DEF|N_WEAK_REF) )
this->setAutoHide();
this->verifyAlignment();
}
private:
friend class Parser<A>;
friend class Section<A>;
friend class CStringSection<A>;
friend class AbsoluteSymbolSection<A>;
pint_t _size;
pint_t _objAddress;
const char* _name;
mutable unsigned long _hash;
uint64_t _fixupsStartIndex : kFixupStartIndexBits,
_lineInfoStartIndex : kLineInfoStartIndexBits,
_unwindInfoStartIndex : kUnwindInfoStartIndexBits,
_fixupsCount : kFixupCountBits,
_lineInfoCount : kLineInfoCountBits,
_unwindInfoCount : kUnwindInfoCountBits;
};
template <typename A>
void Atom<A>::setFixupsRange(uint32_t startIndex, uint32_t count)
{
if ( count >= (1 << kFixupCountBits) )
throwf("too many fixups in function %s", this->name());
if ( startIndex >= (1 << kFixupStartIndexBits) )
throwf("too many fixups in file");
assert(((startIndex+count) <= sect().file()._fixups.size()) && "fixup index out of range");
_fixupsStartIndex = startIndex;
_fixupsCount = count;
}
template <typename A>
void Atom<A>::setUnwindInfoRange(uint32_t startIndex, uint32_t count)
{
if ( count >= (1 << kUnwindInfoCountBits) )
throwf("too many compact unwind infos in function %s", this->name());
if ( startIndex >= (1 << kUnwindInfoStartIndexBits) )
throwf("too many compact unwind infos (%d) in file", startIndex);
assert((startIndex+count) <= sect().file()._unwindInfos.size() && "unwindinfo index out of range");
_unwindInfoStartIndex = startIndex;
_unwindInfoCount = count;
}
template <typename A>
void Atom<A>::extendUnwindInfoRange()
{
if ( _unwindInfoCount+1 >= (1 << kUnwindInfoCountBits) )
throwf("too many compact unwind infos in function %s", this->name());
_unwindInfoCount += 1;
}
template <typename A>
void Atom<A>::setLineInfoRange(uint32_t startIndex, uint32_t count)
{
assert((count < (1 << kLineInfoCountBits)) && "too many line infos");
assert((startIndex+count) < sect().file()._lineInfos.size() && "line info index out of range");
_lineInfoStartIndex = startIndex;
_lineInfoCount = count;
}
template <typename A>
const uint8_t* Atom<A>::contentPointer() const
{
const macho_section<P>* sct = this->sect().machoSection();
if ( this->_objAddress > sct->addr() + sct->size() )
throwf("malformed .o file, symbol has address 0x%0llX which is outside range of its section", (uint64_t)this->_objAddress);
uint32_t fileOffset = sct->offset() - sct->addr() + this->_objAddress;
return this->sect().file().fileContent()+fileOffset;
}
template <typename A>
void Atom<A>::copyRawContent(uint8_t buffer[]) const
{
// copy base bytes
if ( this->contentType() == ld::Atom::typeZeroFill ) {
bzero(buffer, _size);
}
else if ( _size != 0 ) {
memcpy(buffer, this->contentPointer(), _size);
}
}
template <>
void Atom<arm>::verifyAlignment() const
{
if ( (this->section().type() == ld::Section::typeCode) && ! isThumb() ) {
if ( ((_objAddress % 4) != 0) || (this->alignment().powerOf2 < 2) )
warning("ARM function not 4-byte aligned: %s from %s", this->name(), this->file()->path());
}
}
template <typename A>
void Atom<A>::verifyAlignment() const
{
}
template <typename A>
class Parser
{
public:
static bool validFile(const uint8_t* fileContent, bool subtypeMustMatch=false,
cpu_subtype_t subtype=0);
static const char* fileKind(const uint8_t* fileContent);
static bool hasObjC2Categories(const uint8_t* fileContent);
static bool hasObjC1Categories(const uint8_t* fileContent);
static ld::relocatable::File* parse(const uint8_t* fileContent, uint64_t fileLength,
const char* path, time_t modTime, ld::File::Ordinal ordinal,
const ParserOptions& opts) {
Parser p(fileContent, fileLength, path, modTime,
ordinal, opts.warnUnwindConversionProblems,
opts.keepDwarfUnwind, opts.forceDwarfConversion);
return p.parse(opts);
}
typedef typename A::P P;
typedef typename A::P::E E;
typedef typename A::P::uint_t pint_t;
struct SourceLocation {
SourceLocation() {}
SourceLocation(Atom<A>* a, uint32_t o) : atom(a), offsetInAtom(o) {}
Atom<A>* atom;
uint32_t offsetInAtom;
};
struct TargetDesc {
Atom<A>* atom;
const char* name; // only used if targetAtom is NULL
int64_t addend;
bool weakImport; // only used if targetAtom is NULL
};
struct FixupInAtom {
FixupInAtom(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, Atom<A>* target) :
fixup(src.offsetInAtom, c, k, target), atom(src.atom) { src.atom->incrementFixupCount(); }
FixupInAtom(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, ld::Fixup::TargetBinding b, Atom<A>* target) :
fixup(src.offsetInAtom, c, k, b, target), atom(src.atom) { src.atom->incrementFixupCount(); }
FixupInAtom(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, bool wi, const char* name) :
fixup(src.offsetInAtom, c, k, wi, name), atom(src.atom) { src.atom->incrementFixupCount(); }
FixupInAtom(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, ld::Fixup::TargetBinding b, const char* name) :
fixup(src.offsetInAtom, c, k, b, name), atom(src.atom) { src.atom->incrementFixupCount(); }
FixupInAtom(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, uint64_t addend) :
fixup(src.offsetInAtom, c, k, addend), atom(src.atom) { src.atom->incrementFixupCount(); }
FixupInAtom(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k) :
fixup(src.offsetInAtom, c, k, (uint64_t)0), atom(src.atom) { src.atom->incrementFixupCount(); }
ld::Fixup fixup;
Atom<A>* atom;
};
void addFixup(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, Atom<A>* target) {
_allFixups.push_back(FixupInAtom(src, c, k, target));
}
void addFixup(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, ld::Fixup::TargetBinding b, Atom<A>* target) {
_allFixups.push_back(FixupInAtom(src, c, k, b, target));
}
void addFixup(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, bool wi, const char* name) {
_allFixups.push_back(FixupInAtom(src, c, k, wi, name));
}
void addFixup(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, ld::Fixup::TargetBinding b, const char* name) {
_allFixups.push_back(FixupInAtom(src, c, k, b, name));
}
void addFixup(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k, uint64_t addend) {
_allFixups.push_back(FixupInAtom(src, c, k, addend));
}
void addFixup(const SourceLocation& src, ld::Fixup::Cluster c, ld::Fixup::Kind k) {
_allFixups.push_back(FixupInAtom(src, c, k));
}
const char* path() { return _path; }
uint32_t symbolCount() { return _symbolCount; }
uint32_t indirectSymbol(uint32_t indirectIndex);
const macho_nlist<P>& symbolFromIndex(uint32_t index);
const char* nameFromSymbol(const macho_nlist<P>& sym);
ld::Atom::Scope scopeFromSymbol(const macho_nlist<P>& sym);
static ld::Atom::Definition definitionFromSymbol(const macho_nlist<P>& sym);
static ld::Atom::Combine combineFromSymbol(const macho_nlist<P>& sym);
ld::Atom::SymbolTableInclusion inclusionFromSymbol(const macho_nlist<P>& sym);
static bool dontDeadStripFromSymbol(const macho_nlist<P>& sym);
static bool isThumbFromSymbol(const macho_nlist<P>& sym);
static bool weakImportFromSymbol(const macho_nlist<P>& sym);
static bool resolverFromSymbol(const macho_nlist<P>& sym);
uint32_t symbolIndexFromIndirectSectionAddress(pint_t,const macho_section<P>*);
const macho_section<P>* firstMachOSection() { return _sectionsStart; }
const macho_section<P>* machOSectionFromSectionIndex(uint32_t index);
uint32_t machOSectionCount() { return _machOSectionsCount; }
uint32_t undefinedStartIndex() { return _undefinedStartIndex; }
uint32_t undefinedEndIndex() { return _undefinedEndIndex; }
void addFixup(FixupInAtom f) { _allFixups.push_back(f); }
Section<A>* sectionForNum(unsigned int sectNum);
Section<A>* sectionForAddress(pint_t addr);
Atom<A>* findAtomByAddress(pint_t addr);
Atom<A>* findAtomByAddressOrNullIfStub(pint_t addr);
Atom<A>* findAtomByAddressOrLocalTargetOfStub(pint_t addr, uint32_t* offsetInAtom);
Atom<A>* findAtomByName(const char* name); // slow!
void findTargetFromAddress(pint_t addr, TargetDesc& target);
void findTargetFromAddress(pint_t baseAddr, pint_t addr, TargetDesc& target);
void findTargetFromAddressAndSectionNum(pint_t addr, unsigned int sectNum,
TargetDesc& target);
uint32_t tentativeDefinitionCount() { return _tentativeDefinitionCount; }
uint32_t absoluteSymbolCount() { return _absoluteSymbolCount; }
bool hasStubsSection() { return (_stubsSectionNum != 0); }
unsigned int stubsSectionNum() { return _stubsSectionNum; }
void addDtraceExtraInfos(const SourceLocation& src, const char* provider);
const char* scanSymbolTableForAddress(uint64_t addr);
bool warnUnwindConversionProblems() { return _warnUnwindConversionProblems; }
bool hasDataInCodeLabels() { return _hasDataInCodeLabels; }
bool keepDwarfUnwind() { return _keepDwarfUnwind; }
bool forceDwarfConversion() { return _forceDwarfConversion; }
macho_data_in_code_entry<P>* dataInCodeStart() { return _dataInCodeStart; }
macho_data_in_code_entry<P>* dataInCodeEnd() { return _dataInCodeEnd; }
void addFixups(const SourceLocation& src, ld::Fixup::Kind kind, const TargetDesc& target);
void addFixups(const SourceLocation& src, ld::Fixup::Kind kind, const TargetDesc& target, const TargetDesc& picBase);
struct LabelAndCFIBreakIterator {
typedef typename CFISection<A>::CFI_Atom_Info CFI_Atom_Info;
LabelAndCFIBreakIterator(const uint32_t* ssa, uint32_t ssc, const pint_t* cfisa,
uint32_t cfisc, bool ols)
: sortedSymbolIndexes(ssa), sortedSymbolCount(ssc), cfiStartsArray(cfisa),
cfiStartsCount(cfisc), fileHasOverlappingSymbols(ols),
newSection(false), cfiIndex(0), symIndex(0) {}
bool next(Parser<A>& parser, const Section<A>& sect, uint32_t sectNum, pint_t startAddr, pint_t endAddr,