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llvm-6502/tools/llvm-readobj/MachODumper.cpp
Tim Northover 5b003bb869 llvm-readobj: fix MachO relocatoin printing a bit. 
There were two issues here:
1. At the very least, scattered relocations cannot use the same code to
   determine the corresponding symbol being referred to. For some reason we
   pretend there is no symbol, even when one actually exists in the symtab, so to
   match this behaviour getRelocationSymbol should simply return symbols_end for
   scattered relocations.
2. Printing "-" when we can't get a symbol (including the scattered case, but
   not exclusively), isn't that helpful. In both cases there *is* interesting
   information in that field, so we should print it. As hex will do.

Small part of rdar://problem/17553104

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212332 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-04 10:57:56 +00:00

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//===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the MachO-specific dumper for llvm-readobj.
//
//===----------------------------------------------------------------------===//
#include "llvm-readobj.h"
#include "Error.h"
#include "ObjDumper.h"
#include "StreamWriter.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/Casting.h"
using namespace llvm;
using namespace object;
namespace {
class MachODumper : public ObjDumper {
public:
MachODumper(const MachOObjectFile *Obj, StreamWriter& Writer)
: ObjDumper(Writer)
, Obj(Obj) { }
virtual void printFileHeaders() override;
virtual void printSections() override;
virtual void printRelocations() override;
virtual void printSymbols() override;
virtual void printDynamicSymbols() override;
virtual void printUnwindInfo() override;
private:
void printSymbol(const SymbolRef &Symbol);
void printRelocation(const RelocationRef &Reloc);
void printRelocation(const MachOObjectFile *Obj, const RelocationRef &Reloc);
void printSections(const MachOObjectFile *Obj);
const MachOObjectFile *Obj;
};
} // namespace
namespace llvm {
std::error_code createMachODumper(const object::ObjectFile *Obj,
StreamWriter &Writer,
std::unique_ptr<ObjDumper> &Result) {
const MachOObjectFile *MachOObj = dyn_cast<MachOObjectFile>(Obj);
if (!MachOObj)
return readobj_error::unsupported_obj_file_format;
Result.reset(new MachODumper(MachOObj, Writer));
return readobj_error::success;
}
} // namespace llvm
static const EnumEntry<unsigned> MachOSectionTypes[] = {
{ "Regular" , 0x00 },
{ "ZeroFill" , 0x01 },
{ "CStringLiterals" , 0x02 },
{ "4ByteLiterals" , 0x03 },
{ "8ByteLiterals" , 0x04 },
{ "LiteralPointers" , 0x05 },
{ "NonLazySymbolPointers" , 0x06 },
{ "LazySymbolPointers" , 0x07 },
{ "SymbolStubs" , 0x08 },
{ "ModInitFuncs" , 0x09 },
{ "ModTermFuncs" , 0x0A },
{ "Coalesced" , 0x0B },
{ "GBZeroFill" , 0x0C },
{ "Interposing" , 0x0D },
{ "16ByteLiterals" , 0x0E },
{ "DTraceDOF" , 0x0F },
{ "LazyDylibSymbolPoints" , 0x10 },
{ "ThreadLocalRegular" , 0x11 },
{ "ThreadLocalZerofill" , 0x12 },
{ "ThreadLocalVariables" , 0x13 },
{ "ThreadLocalVariablePointers" , 0x14 },
{ "ThreadLocalInitFunctionPointers", 0x15 }
};
static const EnumEntry<unsigned> MachOSectionAttributes[] = {
{ "LocReloc" , 1 << 0 /*S_ATTR_LOC_RELOC */ },
{ "ExtReloc" , 1 << 1 /*S_ATTR_EXT_RELOC */ },
{ "SomeInstructions" , 1 << 2 /*S_ATTR_SOME_INSTRUCTIONS */ },
{ "Debug" , 1 << 17 /*S_ATTR_DEBUG */ },
{ "SelfModifyingCode", 1 << 18 /*S_ATTR_SELF_MODIFYING_CODE*/ },
{ "LiveSupport" , 1 << 19 /*S_ATTR_LIVE_SUPPORT */ },
{ "NoDeadStrip" , 1 << 20 /*S_ATTR_NO_DEAD_STRIP */ },
{ "StripStaticSyms" , 1 << 21 /*S_ATTR_STRIP_STATIC_SYMS */ },
{ "NoTOC" , 1 << 22 /*S_ATTR_NO_TOC */ },
{ "PureInstructions" , 1 << 23 /*S_ATTR_PURE_INSTRUCTIONS */ },
};
static const EnumEntry<unsigned> MachOSymbolRefTypes[] = {
{ "UndefinedNonLazy", 0 },
{ "ReferenceFlagUndefinedLazy", 1 },
{ "ReferenceFlagDefined", 2 },
{ "ReferenceFlagPrivateDefined", 3 },
{ "ReferenceFlagPrivateUndefinedNonLazy", 4 },
{ "ReferenceFlagPrivateUndefinedLazy", 5 }
};
static const EnumEntry<unsigned> MachOSymbolFlags[] = {
{ "ReferencedDynamically", 0x10 },
{ "NoDeadStrip", 0x20 },
{ "WeakRef", 0x40 },
{ "WeakDef", 0x80 }
};
static const EnumEntry<unsigned> MachOSymbolTypes[] = {
{ "Undef", 0x0 },
{ "Abs", 0x2 },
{ "Indirect", 0xA },
{ "PreboundUndef", 0xC },
{ "Section", 0xE }
};
namespace {
struct MachOSection {
ArrayRef<char> Name;
ArrayRef<char> SegmentName;
uint64_t Address;
uint64_t Size;
uint32_t Offset;
uint32_t Alignment;
uint32_t RelocationTableOffset;
uint32_t NumRelocationTableEntries;
uint32_t Flags;
uint32_t Reserved1;
uint32_t Reserved2;
};
struct MachOSymbol {
uint32_t StringIndex;
uint8_t Type;
uint8_t SectionIndex;
uint16_t Flags;
uint64_t Value;
};
}
static void getSection(const MachOObjectFile *Obj,
DataRefImpl Sec,
MachOSection &Section) {
if (!Obj->is64Bit()) {
MachO::section Sect = Obj->getSection(Sec);
Section.Address = Sect.addr;
Section.Size = Sect.size;
Section.Offset = Sect.offset;
Section.Alignment = Sect.align;
Section.RelocationTableOffset = Sect.reloff;
Section.NumRelocationTableEntries = Sect.nreloc;
Section.Flags = Sect.flags;
Section.Reserved1 = Sect.reserved1;
Section.Reserved2 = Sect.reserved2;
return;
}
MachO::section_64 Sect = Obj->getSection64(Sec);
Section.Address = Sect.addr;
Section.Size = Sect.size;
Section.Offset = Sect.offset;
Section.Alignment = Sect.align;
Section.RelocationTableOffset = Sect.reloff;
Section.NumRelocationTableEntries = Sect.nreloc;
Section.Flags = Sect.flags;
Section.Reserved1 = Sect.reserved1;
Section.Reserved2 = Sect.reserved2;
}
static void getSymbol(const MachOObjectFile *Obj,
DataRefImpl DRI,
MachOSymbol &Symbol) {
if (!Obj->is64Bit()) {
MachO::nlist Entry = Obj->getSymbolTableEntry(DRI);
Symbol.StringIndex = Entry.n_strx;
Symbol.Type = Entry.n_type;
Symbol.SectionIndex = Entry.n_sect;
Symbol.Flags = Entry.n_desc;
Symbol.Value = Entry.n_value;
return;
}
MachO::nlist_64 Entry = Obj->getSymbol64TableEntry(DRI);
Symbol.StringIndex = Entry.n_strx;
Symbol.Type = Entry.n_type;
Symbol.SectionIndex = Entry.n_sect;
Symbol.Flags = Entry.n_desc;
Symbol.Value = Entry.n_value;
}
void MachODumper::printFileHeaders() {
W.startLine() << "FileHeaders not implemented.\n";
}
void MachODumper::printSections() {
return printSections(Obj);
}
void MachODumper::printSections(const MachOObjectFile *Obj) {
ListScope Group(W, "Sections");
int SectionIndex = -1;
for (const SectionRef &Section : Obj->sections()) {
++SectionIndex;
MachOSection MOSection;
getSection(Obj, Section.getRawDataRefImpl(), MOSection);
DataRefImpl DR = Section.getRawDataRefImpl();
StringRef Name;
if (error(Section.getName(Name)))
Name = "";
ArrayRef<char> RawName = Obj->getSectionRawName(DR);
StringRef SegmentName = Obj->getSectionFinalSegmentName(DR);
ArrayRef<char> RawSegmentName = Obj->getSectionRawFinalSegmentName(DR);
DictScope SectionD(W, "Section");
W.printNumber("Index", SectionIndex);
W.printBinary("Name", Name, RawName);
W.printBinary("Segment", SegmentName, RawSegmentName);
W.printHex("Address", MOSection.Address);
W.printHex("Size", MOSection.Size);
W.printNumber("Offset", MOSection.Offset);
W.printNumber("Alignment", MOSection.Alignment);
W.printHex("RelocationOffset", MOSection.RelocationTableOffset);
W.printNumber("RelocationCount", MOSection.NumRelocationTableEntries);
W.printEnum("Type", MOSection.Flags & 0xFF,
makeArrayRef(MachOSectionAttributes));
W.printFlags("Attributes", MOSection.Flags >> 8,
makeArrayRef(MachOSectionAttributes));
W.printHex("Reserved1", MOSection.Reserved1);
W.printHex("Reserved2", MOSection.Reserved2);
if (opts::SectionRelocations) {
ListScope D(W, "Relocations");
for (const RelocationRef &Reloc : Section.relocations())
printRelocation(Reloc);
}
if (opts::SectionSymbols) {
ListScope D(W, "Symbols");
for (const SymbolRef &Symbol : Obj->symbols()) {
bool Contained = false;
if (Section.containsSymbol(Symbol, Contained) || !Contained)
continue;
printSymbol(Symbol);
}
}
if (opts::SectionData) {
StringRef Data;
if (error(Section.getContents(Data)))
break;
W.printBinaryBlock("SectionData", Data);
}
}
}
void MachODumper::printRelocations() {
ListScope D(W, "Relocations");
std::error_code EC;
for (const SectionRef &Section : Obj->sections()) {
StringRef Name;
if (error(Section.getName(Name)))
continue;
bool PrintedGroup = false;
for (const RelocationRef &Reloc : Section.relocations()) {
if (!PrintedGroup) {
W.startLine() << "Section " << Name << " {\n";
W.indent();
PrintedGroup = true;
}
printRelocation(Reloc);
}
if (PrintedGroup) {
W.unindent();
W.startLine() << "}\n";
}
}
}
void MachODumper::printRelocation(const RelocationRef &Reloc) {
return printRelocation(Obj, Reloc);
}
void MachODumper::printRelocation(const MachOObjectFile *Obj,
const RelocationRef &Reloc) {
uint64_t Offset;
SmallString<32> RelocName;
if (error(Reloc.getOffset(Offset)))
return;
if (error(Reloc.getTypeName(RelocName)))
return;
DataRefImpl DR = Reloc.getRawDataRefImpl();
MachO::any_relocation_info RE = Obj->getRelocation(DR);
bool IsScattered = Obj->isRelocationScattered(RE);
SmallString<32> SymbolNameOrOffset("0x");
if (IsScattered) {
// Scattered relocations don't really have an associated symbol
// for some reason, even if one exists in the symtab at the correct address.
SymbolNameOrOffset += utohexstr(Obj->getScatteredRelocationValue(RE));
} else {
symbol_iterator Symbol = Reloc.getSymbol();
if (Symbol != Obj->symbol_end()) {
StringRef SymbolName;
if (error(Symbol->getName(SymbolName)))
return;
SymbolNameOrOffset = SymbolName;
} else
SymbolNameOrOffset += utohexstr(Obj->getPlainRelocationSymbolNum(RE));
}
if (opts::ExpandRelocs) {
DictScope Group(W, "Relocation");
W.printHex("Offset", Offset);
W.printNumber("PCRel", Obj->getAnyRelocationPCRel(RE));
W.printNumber("Length", Obj->getAnyRelocationLength(RE));
if (IsScattered)
W.printString("Extern", StringRef("N/A"));
else
W.printNumber("Extern", Obj->getPlainRelocationExternal(RE));
W.printNumber("Type", RelocName, Obj->getAnyRelocationType(RE));
W.printString("Symbol", SymbolNameOrOffset);
W.printNumber("Scattered", IsScattered);
} else {
raw_ostream& OS = W.startLine();
OS << W.hex(Offset)
<< " " << Obj->getAnyRelocationPCRel(RE)
<< " " << Obj->getAnyRelocationLength(RE);
if (IsScattered)
OS << " n/a";
else
OS << " " << Obj->getPlainRelocationExternal(RE);
OS << " " << RelocName
<< " " << IsScattered
<< " " << SymbolNameOrOffset
<< "\n";
}
}
void MachODumper::printSymbols() {
ListScope Group(W, "Symbols");
for (const SymbolRef &Symbol : Obj->symbols()) {
printSymbol(Symbol);
}
}
void MachODumper::printDynamicSymbols() {
ListScope Group(W, "DynamicSymbols");
}
void MachODumper::printSymbol(const SymbolRef &Symbol) {
StringRef SymbolName;
if (Symbol.getName(SymbolName))
SymbolName = "";
MachOSymbol MOSymbol;
getSymbol(Obj, Symbol.getRawDataRefImpl(), MOSymbol);
StringRef SectionName = "";
section_iterator SecI(Obj->section_begin());
if (!error(Symbol.getSection(SecI)) && SecI != Obj->section_end())
error(SecI->getName(SectionName));
DictScope D(W, "Symbol");
W.printNumber("Name", SymbolName, MOSymbol.StringIndex);
if (MOSymbol.Type & MachO::N_STAB) {
W.printHex("Type", "SymDebugTable", MOSymbol.Type);
} else {
if (MOSymbol.Type & MachO::N_PEXT)
W.startLine() << "PrivateExtern\n";
if (MOSymbol.Type & MachO::N_EXT)
W.startLine() << "Extern\n";
W.printEnum("Type", uint8_t(MOSymbol.Type & MachO::N_TYPE),
makeArrayRef(MachOSymbolTypes));
}
W.printHex("Section", SectionName, MOSymbol.SectionIndex);
W.printEnum("RefType", static_cast<uint16_t>(MOSymbol.Flags & 0xF),
makeArrayRef(MachOSymbolRefTypes));
W.printFlags("Flags", static_cast<uint16_t>(MOSymbol.Flags & ~0xF),
makeArrayRef(MachOSymbolFlags));
W.printHex("Value", MOSymbol.Value);
}
void MachODumper::printUnwindInfo() {
W.startLine() << "UnwindInfo not implemented.\n";
}
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