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llvm-mirror/tools/llvm-readobj/MachODumper.cpp
Rafael Espindola d01a093e4e Remove bogus std::error_code returns form SectionRef. 
There are two methods in SectionRef that can fail:

* getName: The index into the string table can be invalid.
* getContents: The section might point to invalid contents.

Every other method will always succeed and returning and std::error_code just
complicates the code. For example, a section can have an invalid alignment,
but if we are able to get to the section structure at all and create a
SectionRef, we will always be able to read that invalid alignment.

llvm-svn: 219314
2014-10-08 15:28:58 +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) { }
void printFileHeaders() override;
void printSections() override;
void printRelocations() override;
void printSymbols() override;
void printDynamicSymbols() override;
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()) {
if (!Section.containsSymbol(Symbol))
continue;
printSymbol(Symbol);
}
}
if (opts::SectionData) {
bool IsBSS = Section.isBSS();
if (!IsBSS) {
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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