mirror of
https://github.com/c64scene-ar/llvm-6502.git
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48bfab80aa
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215437 91177308-0d34-0410-b5e6-96231b3b80d8
933 lines
32 KiB
C++
933 lines
32 KiB
C++
//===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
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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 implements the MachO-specific dumper for llvm-objdump.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-objdump.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/DebugInfo/DIContext.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCInstrAnalysis.h"
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#include "llvm/MC/MCInstrDesc.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Support/MachO.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cstring>
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#include <system_error>
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using namespace llvm;
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using namespace object;
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static cl::opt<bool>
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UseDbg("g", cl::desc("Print line information from debug info if available"));
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static cl::opt<std::string>
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DSYMFile("dsym", cl::desc("Use .dSYM file for debug info"));
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static const Target *GetTarget(const MachOObjectFile *MachOObj) {
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// Figure out the target triple.
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if (TripleName.empty()) {
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llvm::Triple TT("unknown-unknown-unknown");
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TT.setArch(Triple::ArchType(MachOObj->getArch()));
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TripleName = TT.str();
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}
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// Get the target specific parser.
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
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if (TheTarget)
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return TheTarget;
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errs() << "llvm-objdump: error: unable to get target for '" << TripleName
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<< "', see --version and --triple.\n";
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return nullptr;
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}
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struct SymbolSorter {
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bool operator()(const SymbolRef &A, const SymbolRef &B) {
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SymbolRef::Type AType, BType;
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A.getType(AType);
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B.getType(BType);
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uint64_t AAddr, BAddr;
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if (AType != SymbolRef::ST_Function)
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AAddr = 0;
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else
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A.getAddress(AAddr);
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if (BType != SymbolRef::ST_Function)
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BAddr = 0;
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else
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B.getAddress(BAddr);
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return AAddr < BAddr;
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}
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};
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// Types for the storted data in code table that is built before disassembly
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// and the predicate function to sort them.
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typedef std::pair<uint64_t, DiceRef> DiceTableEntry;
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typedef std::vector<DiceTableEntry> DiceTable;
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typedef DiceTable::iterator dice_table_iterator;
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static bool
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compareDiceTableEntries(const DiceTableEntry i,
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const DiceTableEntry j) {
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return i.first == j.first;
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}
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static void DumpDataInCode(const char *bytes, uint64_t Size,
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unsigned short Kind) {
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uint64_t Value;
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switch (Kind) {
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case MachO::DICE_KIND_DATA:
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switch (Size) {
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case 4:
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Value = bytes[3] << 24 |
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bytes[2] << 16 |
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bytes[1] << 8 |
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bytes[0];
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outs() << "\t.long " << Value;
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break;
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case 2:
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Value = bytes[1] << 8 |
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bytes[0];
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outs() << "\t.short " << Value;
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break;
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case 1:
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Value = bytes[0];
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outs() << "\t.byte " << Value;
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break;
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}
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outs() << "\t@ KIND_DATA\n";
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break;
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case MachO::DICE_KIND_JUMP_TABLE8:
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Value = bytes[0];
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outs() << "\t.byte " << Value << "\t@ KIND_JUMP_TABLE8";
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break;
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case MachO::DICE_KIND_JUMP_TABLE16:
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Value = bytes[1] << 8 |
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bytes[0];
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outs() << "\t.short " << Value << "\t@ KIND_JUMP_TABLE16";
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break;
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case MachO::DICE_KIND_JUMP_TABLE32:
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Value = bytes[3] << 24 |
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bytes[2] << 16 |
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bytes[1] << 8 |
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bytes[0];
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outs() << "\t.long " << Value << "\t@ KIND_JUMP_TABLE32";
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break;
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default:
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outs() << "\t@ data in code kind = " << Kind << "\n";
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break;
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}
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}
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static void getSectionsAndSymbols(const MachO::mach_header Header,
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MachOObjectFile *MachOObj,
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std::vector<SectionRef> &Sections,
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std::vector<SymbolRef> &Symbols,
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SmallVectorImpl<uint64_t> &FoundFns,
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uint64_t &BaseSegmentAddress) {
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for (const SymbolRef &Symbol : MachOObj->symbols())
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Symbols.push_back(Symbol);
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for (const SectionRef &Section : MachOObj->sections()) {
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StringRef SectName;
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Section.getName(SectName);
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Sections.push_back(Section);
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}
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MachOObjectFile::LoadCommandInfo Command =
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MachOObj->getFirstLoadCommandInfo();
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bool BaseSegmentAddressSet = false;
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for (unsigned i = 0; ; ++i) {
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if (Command.C.cmd == MachO::LC_FUNCTION_STARTS) {
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// We found a function starts segment, parse the addresses for later
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// consumption.
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MachO::linkedit_data_command LLC =
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MachOObj->getLinkeditDataLoadCommand(Command);
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MachOObj->ReadULEB128s(LLC.dataoff, FoundFns);
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}
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else if (Command.C.cmd == MachO::LC_SEGMENT) {
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MachO::segment_command SLC =
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MachOObj->getSegmentLoadCommand(Command);
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StringRef SegName = SLC.segname;
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if(!BaseSegmentAddressSet && SegName != "__PAGEZERO") {
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BaseSegmentAddressSet = true;
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BaseSegmentAddress = SLC.vmaddr;
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}
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}
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if (i == Header.ncmds - 1)
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break;
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else
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Command = MachOObj->getNextLoadCommandInfo(Command);
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}
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}
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static void DisassembleInputMachO2(StringRef Filename,
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MachOObjectFile *MachOOF);
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void llvm::DisassembleInputMachO(StringRef Filename) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> Buff =
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MemoryBuffer::getFileOrSTDIN(Filename);
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if (std::error_code EC = Buff.getError()) {
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errs() << "llvm-objdump: " << Filename << ": " << EC.message() << "\n";
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return;
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}
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std::unique_ptr<MachOObjectFile> MachOOF =
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std::move(ObjectFile::createMachOObjectFile(Buff.get()).get());
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DisassembleInputMachO2(Filename, MachOOF.get());
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}
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static void DisassembleInputMachO2(StringRef Filename,
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MachOObjectFile *MachOOF) {
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const Target *TheTarget = GetTarget(MachOOF);
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if (!TheTarget) {
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// GetTarget prints out stuff.
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return;
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}
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std::unique_ptr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
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std::unique_ptr<MCInstrAnalysis> InstrAnalysis(
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TheTarget->createMCInstrAnalysis(InstrInfo.get()));
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MAttrs.size()) {
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SubtargetFeatures Features;
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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// Set up disassembler.
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std::unique_ptr<const MCRegisterInfo> MRI(
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TheTarget->createMCRegInfo(TripleName));
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std::unique_ptr<const MCAsmInfo> AsmInfo(
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TheTarget->createMCAsmInfo(*MRI, TripleName));
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std::unique_ptr<const MCSubtargetInfo> STI(
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TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
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MCContext Ctx(AsmInfo.get(), MRI.get(), nullptr);
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std::unique_ptr<const MCDisassembler> DisAsm(
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TheTarget->createMCDisassembler(*STI, Ctx));
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int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
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std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
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AsmPrinterVariant, *AsmInfo, *InstrInfo, *MRI, *STI));
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if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
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errs() << "error: couldn't initialize disassembler for target "
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<< TripleName << '\n';
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return;
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}
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outs() << '\n' << Filename << ":\n\n";
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MachO::mach_header Header = MachOOF->getHeader();
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// FIXME: FoundFns isn't used anymore. Using symbols/LC_FUNCTION_STARTS to
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// determine function locations will eventually go in MCObjectDisassembler.
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// FIXME: Using the -cfg command line option, this code used to be able to
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// annotate relocations with the referenced symbol's name, and if this was
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// inside a __[cf]string section, the data it points to. This is now replaced
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// by the upcoming MCSymbolizer, which needs the appropriate setup done above.
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std::vector<SectionRef> Sections;
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std::vector<SymbolRef> Symbols;
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SmallVector<uint64_t, 8> FoundFns;
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uint64_t BaseSegmentAddress;
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getSectionsAndSymbols(Header, MachOOF, Sections, Symbols, FoundFns,
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BaseSegmentAddress);
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// Sort the symbols by address, just in case they didn't come in that way.
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std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
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// Build a data in code table that is sorted on by the address of each entry.
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uint64_t BaseAddress = 0;
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if (Header.filetype == MachO::MH_OBJECT)
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Sections[0].getAddress(BaseAddress);
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else
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BaseAddress = BaseSegmentAddress;
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DiceTable Dices;
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for (dice_iterator DI = MachOOF->begin_dices(), DE = MachOOF->end_dices();
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DI != DE; ++DI) {
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uint32_t Offset;
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DI->getOffset(Offset);
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Dices.push_back(std::make_pair(BaseAddress + Offset, *DI));
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}
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array_pod_sort(Dices.begin(), Dices.end());
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#ifndef NDEBUG
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raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
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#else
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raw_ostream &DebugOut = nulls();
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#endif
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std::unique_ptr<DIContext> diContext;
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ObjectFile *DbgObj = MachOOF;
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// Try to find debug info and set up the DIContext for it.
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if (UseDbg) {
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// A separate DSym file path was specified, parse it as a macho file,
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// get the sections and supply it to the section name parsing machinery.
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if (!DSYMFile.empty()) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
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MemoryBuffer::getFileOrSTDIN(DSYMFile);
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if (std::error_code EC = Buf.getError()) {
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errs() << "llvm-objdump: " << Filename << ": " << EC.message() << '\n';
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return;
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}
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DbgObj = ObjectFile::createMachOObjectFile(Buf.get()).get().release();
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}
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// Setup the DIContext
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diContext.reset(DIContext::getDWARFContext(*DbgObj));
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}
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for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
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bool SectIsText = false;
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Sections[SectIdx].isText(SectIsText);
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if (SectIsText == false)
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continue;
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StringRef SectName;
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if (Sections[SectIdx].getName(SectName) ||
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SectName != "__text")
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continue; // Skip non-text sections
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DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
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StringRef SegmentName = MachOOF->getSectionFinalSegmentName(DR);
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if (SegmentName != "__TEXT")
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continue;
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StringRef Bytes;
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Sections[SectIdx].getContents(Bytes);
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StringRefMemoryObject memoryObject(Bytes);
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bool symbolTableWorked = false;
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// Parse relocations.
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std::vector<std::pair<uint64_t, SymbolRef>> Relocs;
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for (const RelocationRef &Reloc : Sections[SectIdx].relocations()) {
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uint64_t RelocOffset, SectionAddress;
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Reloc.getOffset(RelocOffset);
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Sections[SectIdx].getAddress(SectionAddress);
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RelocOffset -= SectionAddress;
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symbol_iterator RelocSym = Reloc.getSymbol();
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Relocs.push_back(std::make_pair(RelocOffset, *RelocSym));
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}
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array_pod_sort(Relocs.begin(), Relocs.end());
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// Disassemble symbol by symbol.
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for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
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StringRef SymName;
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Symbols[SymIdx].getName(SymName);
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SymbolRef::Type ST;
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Symbols[SymIdx].getType(ST);
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if (ST != SymbolRef::ST_Function)
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continue;
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// Make sure the symbol is defined in this section.
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bool containsSym = false;
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Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
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if (!containsSym)
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continue;
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// Start at the address of the symbol relative to the section's address.
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uint64_t SectionAddress = 0;
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uint64_t Start = 0;
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Sections[SectIdx].getAddress(SectionAddress);
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Symbols[SymIdx].getAddress(Start);
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Start -= SectionAddress;
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// Stop disassembling either at the beginning of the next symbol or at
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// the end of the section.
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bool containsNextSym = false;
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uint64_t NextSym = 0;
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uint64_t NextSymIdx = SymIdx+1;
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while (Symbols.size() > NextSymIdx) {
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SymbolRef::Type NextSymType;
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Symbols[NextSymIdx].getType(NextSymType);
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if (NextSymType == SymbolRef::ST_Function) {
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Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
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containsNextSym);
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Symbols[NextSymIdx].getAddress(NextSym);
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NextSym -= SectionAddress;
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break;
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}
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++NextSymIdx;
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}
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uint64_t SectSize;
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Sections[SectIdx].getSize(SectSize);
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uint64_t End = containsNextSym ? NextSym : SectSize;
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uint64_t Size;
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symbolTableWorked = true;
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outs() << SymName << ":\n";
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DILineInfo lastLine;
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for (uint64_t Index = Start; Index < End; Index += Size) {
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MCInst Inst;
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uint64_t SectAddress = 0;
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Sections[SectIdx].getAddress(SectAddress);
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outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
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// Check the data in code table here to see if this is data not an
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// instruction to be disassembled.
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DiceTable Dice;
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Dice.push_back(std::make_pair(SectAddress + Index, DiceRef()));
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dice_table_iterator DTI = std::search(Dices.begin(), Dices.end(),
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Dice.begin(), Dice.end(),
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compareDiceTableEntries);
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if (DTI != Dices.end()){
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uint16_t Length;
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DTI->second.getLength(Length);
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DumpBytes(StringRef(Bytes.data() + Index, Length));
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uint16_t Kind;
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DTI->second.getKind(Kind);
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DumpDataInCode(Bytes.data() + Index, Length, Kind);
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continue;
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}
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if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
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DebugOut, nulls())) {
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DumpBytes(StringRef(Bytes.data() + Index, Size));
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IP->printInst(&Inst, outs(), "");
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// Print debug info.
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if (diContext) {
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DILineInfo dli =
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diContext->getLineInfoForAddress(SectAddress + Index);
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// Print valid line info if it changed.
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if (dli != lastLine && dli.Line != 0)
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outs() << "\t## " << dli.FileName << ':' << dli.Line << ':'
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<< dli.Column;
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lastLine = dli;
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}
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outs() << "\n";
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} else {
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errs() << "llvm-objdump: warning: invalid instruction encoding\n";
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if (Size == 0)
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Size = 1; // skip illegible bytes
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}
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}
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}
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if (!symbolTableWorked) {
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// Reading the symbol table didn't work, disassemble the whole section.
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uint64_t SectAddress;
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Sections[SectIdx].getAddress(SectAddress);
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uint64_t SectSize;
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Sections[SectIdx].getSize(SectSize);
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uint64_t InstSize;
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for (uint64_t Index = 0; Index < SectSize; Index += InstSize) {
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MCInst Inst;
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if (DisAsm->getInstruction(Inst, InstSize, memoryObject, Index,
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DebugOut, nulls())) {
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outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
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DumpBytes(StringRef(Bytes.data() + Index, InstSize));
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IP->printInst(&Inst, outs(), "");
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outs() << "\n";
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} else {
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errs() << "llvm-objdump: warning: invalid instruction encoding\n";
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if (InstSize == 0)
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InstSize = 1; // skip illegible bytes
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}
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}
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// __compact_unwind section dumping
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//===----------------------------------------------------------------------===//
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namespace {
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template <typename T> static uint64_t readNext(const char *&Buf) {
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using llvm::support::little;
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using llvm::support::unaligned;
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uint64_t Val = support::endian::read<T, little, unaligned>(Buf);
|
|
Buf += sizeof(T);
|
|
return Val;
|
|
}
|
|
|
|
struct CompactUnwindEntry {
|
|
uint32_t OffsetInSection;
|
|
|
|
uint64_t FunctionAddr;
|
|
uint32_t Length;
|
|
uint32_t CompactEncoding;
|
|
uint64_t PersonalityAddr;
|
|
uint64_t LSDAAddr;
|
|
|
|
RelocationRef FunctionReloc;
|
|
RelocationRef PersonalityReloc;
|
|
RelocationRef LSDAReloc;
|
|
|
|
CompactUnwindEntry(StringRef Contents, unsigned Offset, bool Is64)
|
|
: OffsetInSection(Offset) {
|
|
if (Is64)
|
|
read<uint64_t>(Contents.data() + Offset);
|
|
else
|
|
read<uint32_t>(Contents.data() + Offset);
|
|
}
|
|
|
|
private:
|
|
template<typename UIntPtr>
|
|
void read(const char *Buf) {
|
|
FunctionAddr = readNext<UIntPtr>(Buf);
|
|
Length = readNext<uint32_t>(Buf);
|
|
CompactEncoding = readNext<uint32_t>(Buf);
|
|
PersonalityAddr = readNext<UIntPtr>(Buf);
|
|
LSDAAddr = readNext<UIntPtr>(Buf);
|
|
}
|
|
};
|
|
}
|
|
|
|
/// Given a relocation from __compact_unwind, consisting of the RelocationRef
|
|
/// and data being relocated, determine the best base Name and Addend to use for
|
|
/// display purposes.
|
|
///
|
|
/// 1. An Extern relocation will directly reference a symbol (and the data is
|
|
/// then already an addend), so use that.
|
|
/// 2. Otherwise the data is an offset in the object file's layout; try to find
|
|
// a symbol before it in the same section, and use the offset from there.
|
|
/// 3. Finally, if all that fails, fall back to an offset from the start of the
|
|
/// referenced section.
|
|
static void findUnwindRelocNameAddend(const MachOObjectFile *Obj,
|
|
std::map<uint64_t, SymbolRef> &Symbols,
|
|
const RelocationRef &Reloc,
|
|
uint64_t Addr,
|
|
StringRef &Name, uint64_t &Addend) {
|
|
if (Reloc.getSymbol() != Obj->symbol_end()) {
|
|
Reloc.getSymbol()->getName(Name);
|
|
Addend = Addr;
|
|
return;
|
|
}
|
|
|
|
auto RE = Obj->getRelocation(Reloc.getRawDataRefImpl());
|
|
SectionRef RelocSection = Obj->getRelocationSection(RE);
|
|
|
|
uint64_t SectionAddr;
|
|
RelocSection.getAddress(SectionAddr);
|
|
|
|
auto Sym = Symbols.upper_bound(Addr);
|
|
if (Sym == Symbols.begin()) {
|
|
// The first symbol in the object is after this reference, the best we can
|
|
// do is section-relative notation.
|
|
RelocSection.getName(Name);
|
|
Addend = Addr - SectionAddr;
|
|
return;
|
|
}
|
|
|
|
// Go back one so that SymbolAddress <= Addr.
|
|
--Sym;
|
|
|
|
section_iterator SymSection = Obj->section_end();
|
|
Sym->second.getSection(SymSection);
|
|
if (RelocSection == *SymSection) {
|
|
// There's a valid symbol in the same section before this reference.
|
|
Sym->second.getName(Name);
|
|
Addend = Addr - Sym->first;
|
|
return;
|
|
}
|
|
|
|
// There is a symbol before this reference, but it's in a different
|
|
// section. Probably not helpful to mention it, so use the section name.
|
|
RelocSection.getName(Name);
|
|
Addend = Addr - SectionAddr;
|
|
}
|
|
|
|
static void printUnwindRelocDest(const MachOObjectFile *Obj,
|
|
std::map<uint64_t, SymbolRef> &Symbols,
|
|
const RelocationRef &Reloc,
|
|
uint64_t Addr) {
|
|
StringRef Name;
|
|
uint64_t Addend;
|
|
|
|
findUnwindRelocNameAddend(Obj, Symbols, Reloc, Addr, Name, Addend);
|
|
|
|
outs() << Name;
|
|
if (Addend)
|
|
outs() << " + " << format("0x%" PRIx64, Addend);
|
|
}
|
|
|
|
static void
|
|
printMachOCompactUnwindSection(const MachOObjectFile *Obj,
|
|
std::map<uint64_t, SymbolRef> &Symbols,
|
|
const SectionRef &CompactUnwind) {
|
|
|
|
assert(Obj->isLittleEndian() &&
|
|
"There should not be a big-endian .o with __compact_unwind");
|
|
|
|
bool Is64 = Obj->is64Bit();
|
|
uint32_t PointerSize = Is64 ? sizeof(uint64_t) : sizeof(uint32_t);
|
|
uint32_t EntrySize = 3 * PointerSize + 2 * sizeof(uint32_t);
|
|
|
|
StringRef Contents;
|
|
CompactUnwind.getContents(Contents);
|
|
|
|
SmallVector<CompactUnwindEntry, 4> CompactUnwinds;
|
|
|
|
// First populate the initial raw offsets, encodings and so on from the entry.
|
|
for (unsigned Offset = 0; Offset < Contents.size(); Offset += EntrySize) {
|
|
CompactUnwindEntry Entry(Contents.data(), Offset, Is64);
|
|
CompactUnwinds.push_back(Entry);
|
|
}
|
|
|
|
// Next we need to look at the relocations to find out what objects are
|
|
// actually being referred to.
|
|
for (const RelocationRef &Reloc : CompactUnwind.relocations()) {
|
|
uint64_t RelocAddress;
|
|
Reloc.getOffset(RelocAddress);
|
|
|
|
uint32_t EntryIdx = RelocAddress / EntrySize;
|
|
uint32_t OffsetInEntry = RelocAddress - EntryIdx * EntrySize;
|
|
CompactUnwindEntry &Entry = CompactUnwinds[EntryIdx];
|
|
|
|
if (OffsetInEntry == 0)
|
|
Entry.FunctionReloc = Reloc;
|
|
else if (OffsetInEntry == PointerSize + 2 * sizeof(uint32_t))
|
|
Entry.PersonalityReloc = Reloc;
|
|
else if (OffsetInEntry == 2 * PointerSize + 2 * sizeof(uint32_t))
|
|
Entry.LSDAReloc = Reloc;
|
|
else
|
|
llvm_unreachable("Unexpected relocation in __compact_unwind section");
|
|
}
|
|
|
|
// Finally, we're ready to print the data we've gathered.
|
|
outs() << "Contents of __compact_unwind section:\n";
|
|
for (auto &Entry : CompactUnwinds) {
|
|
outs() << " Entry at offset "
|
|
<< format("0x%" PRIx32, Entry.OffsetInSection) << ":\n";
|
|
|
|
// 1. Start of the region this entry applies to.
|
|
outs() << " start: "
|
|
<< format("0x%" PRIx64, Entry.FunctionAddr) << ' ';
|
|
printUnwindRelocDest(Obj, Symbols, Entry.FunctionReloc,
|
|
Entry.FunctionAddr);
|
|
outs() << '\n';
|
|
|
|
// 2. Length of the region this entry applies to.
|
|
outs() << " length: "
|
|
<< format("0x%" PRIx32, Entry.Length) << '\n';
|
|
// 3. The 32-bit compact encoding.
|
|
outs() << " compact encoding: "
|
|
<< format("0x%08" PRIx32, Entry.CompactEncoding) << '\n';
|
|
|
|
// 4. The personality function, if present.
|
|
if (Entry.PersonalityReloc.getObjectFile()) {
|
|
outs() << " personality function: "
|
|
<< format("0x%" PRIx64, Entry.PersonalityAddr) << ' ';
|
|
printUnwindRelocDest(Obj, Symbols, Entry.PersonalityReloc,
|
|
Entry.PersonalityAddr);
|
|
outs() << '\n';
|
|
}
|
|
|
|
// 5. This entry's language-specific data area.
|
|
if (Entry.LSDAReloc.getObjectFile()) {
|
|
outs() << " LSDA: "
|
|
<< format("0x%" PRIx64, Entry.LSDAAddr) << ' ';
|
|
printUnwindRelocDest(Obj, Symbols, Entry.LSDAReloc, Entry.LSDAAddr);
|
|
outs() << '\n';
|
|
}
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// __unwind_info section dumping
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static void printRegularSecondLevelUnwindPage(const char *PageStart) {
|
|
const char *Pos = PageStart;
|
|
uint32_t Kind = readNext<uint32_t>(Pos);
|
|
(void)Kind;
|
|
assert(Kind == 2 && "kind for a regular 2nd level index should be 2");
|
|
|
|
uint16_t EntriesStart = readNext<uint16_t>(Pos);
|
|
uint16_t NumEntries = readNext<uint16_t>(Pos);
|
|
|
|
Pos = PageStart + EntriesStart;
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
uint32_t FunctionOffset = readNext<uint32_t>(Pos);
|
|
uint32_t Encoding = readNext<uint32_t>(Pos);
|
|
|
|
outs() << " [" << i << "]: "
|
|
<< "function offset="
|
|
<< format("0x%08" PRIx32, FunctionOffset) << ", "
|
|
<< "encoding="
|
|
<< format("0x%08" PRIx32, Encoding)
|
|
<< '\n';
|
|
}
|
|
}
|
|
|
|
static void printCompressedSecondLevelUnwindPage(
|
|
const char *PageStart, uint32_t FunctionBase,
|
|
const SmallVectorImpl<uint32_t> &CommonEncodings) {
|
|
const char *Pos = PageStart;
|
|
uint32_t Kind = readNext<uint32_t>(Pos);
|
|
(void)Kind;
|
|
assert(Kind == 3 && "kind for a compressed 2nd level index should be 3");
|
|
|
|
uint16_t EntriesStart = readNext<uint16_t>(Pos);
|
|
uint16_t NumEntries = readNext<uint16_t>(Pos);
|
|
|
|
uint16_t EncodingsStart = readNext<uint16_t>(Pos);
|
|
readNext<uint16_t>(Pos);
|
|
auto PageEncodings = (support::ulittle32_t *)(PageStart + EncodingsStart);
|
|
|
|
Pos = PageStart + EntriesStart;
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
uint32_t Entry = readNext<uint32_t>(Pos);
|
|
uint32_t FunctionOffset = FunctionBase + (Entry & 0xffffff);
|
|
uint32_t EncodingIdx = Entry >> 24;
|
|
|
|
uint32_t Encoding;
|
|
if (EncodingIdx < CommonEncodings.size())
|
|
Encoding = CommonEncodings[EncodingIdx];
|
|
else
|
|
Encoding = PageEncodings[EncodingIdx - CommonEncodings.size()];
|
|
|
|
outs() << " [" << i << "]: "
|
|
<< "function offset="
|
|
<< format("0x%08" PRIx32, FunctionOffset) << ", "
|
|
<< "encoding[" << EncodingIdx << "]="
|
|
<< format("0x%08" PRIx32, Encoding)
|
|
<< '\n';
|
|
}
|
|
}
|
|
|
|
static void
|
|
printMachOUnwindInfoSection(const MachOObjectFile *Obj,
|
|
std::map<uint64_t, SymbolRef> &Symbols,
|
|
const SectionRef &UnwindInfo) {
|
|
|
|
assert(Obj->isLittleEndian() &&
|
|
"There should not be a big-endian .o with __unwind_info");
|
|
|
|
outs() << "Contents of __unwind_info section:\n";
|
|
|
|
StringRef Contents;
|
|
UnwindInfo.getContents(Contents);
|
|
const char *Pos = Contents.data();
|
|
|
|
//===----------------------------------
|
|
// Section header
|
|
//===----------------------------------
|
|
|
|
uint32_t Version = readNext<uint32_t>(Pos);
|
|
outs() << " Version: "
|
|
<< format("0x%" PRIx32, Version) << '\n';
|
|
assert(Version == 1 && "only understand version 1");
|
|
|
|
uint32_t CommonEncodingsStart = readNext<uint32_t>(Pos);
|
|
outs() << " Common encodings array section offset: "
|
|
<< format("0x%" PRIx32, CommonEncodingsStart) << '\n';
|
|
uint32_t NumCommonEncodings = readNext<uint32_t>(Pos);
|
|
outs() << " Number of common encodings in array: "
|
|
<< format("0x%" PRIx32, NumCommonEncodings) << '\n';
|
|
|
|
uint32_t PersonalitiesStart = readNext<uint32_t>(Pos);
|
|
outs() << " Personality function array section offset: "
|
|
<< format("0x%" PRIx32, PersonalitiesStart) << '\n';
|
|
uint32_t NumPersonalities = readNext<uint32_t>(Pos);
|
|
outs() << " Number of personality functions in array: "
|
|
<< format("0x%" PRIx32, NumPersonalities) << '\n';
|
|
|
|
uint32_t IndicesStart = readNext<uint32_t>(Pos);
|
|
outs() << " Index array section offset: "
|
|
<< format("0x%" PRIx32, IndicesStart) << '\n';
|
|
uint32_t NumIndices = readNext<uint32_t>(Pos);
|
|
outs() << " Number of indices in array: "
|
|
<< format("0x%" PRIx32, NumIndices) << '\n';
|
|
|
|
//===----------------------------------
|
|
// A shared list of common encodings
|
|
//===----------------------------------
|
|
|
|
// These occupy indices in the range [0, N] whenever an encoding is referenced
|
|
// from a compressed 2nd level index table. In practice the linker only
|
|
// creates ~128 of these, so that indices are available to embed encodings in
|
|
// the 2nd level index.
|
|
|
|
SmallVector<uint32_t, 64> CommonEncodings;
|
|
outs() << " Common encodings: (count = " << NumCommonEncodings << ")\n";
|
|
Pos = Contents.data() + CommonEncodingsStart;
|
|
for (unsigned i = 0; i < NumCommonEncodings; ++i) {
|
|
uint32_t Encoding = readNext<uint32_t>(Pos);
|
|
CommonEncodings.push_back(Encoding);
|
|
|
|
outs() << " encoding[" << i << "]: " << format("0x%08" PRIx32, Encoding)
|
|
<< '\n';
|
|
}
|
|
|
|
|
|
//===----------------------------------
|
|
// Personality functions used in this executable
|
|
//===----------------------------------
|
|
|
|
// There should be only a handful of these (one per source language,
|
|
// roughly). Particularly since they only get 2 bits in the compact encoding.
|
|
|
|
outs() << " Personality functions: (count = " << NumPersonalities << ")\n";
|
|
Pos = Contents.data() + PersonalitiesStart;
|
|
for (unsigned i = 0; i < NumPersonalities; ++i) {
|
|
uint32_t PersonalityFn = readNext<uint32_t>(Pos);
|
|
outs() << " personality[" << i + 1
|
|
<< "]: " << format("0x%08" PRIx32, PersonalityFn) << '\n';
|
|
}
|
|
|
|
//===----------------------------------
|
|
// The level 1 index entries
|
|
//===----------------------------------
|
|
|
|
// These specify an approximate place to start searching for the more detailed
|
|
// information, sorted by PC.
|
|
|
|
struct IndexEntry {
|
|
uint32_t FunctionOffset;
|
|
uint32_t SecondLevelPageStart;
|
|
uint32_t LSDAStart;
|
|
};
|
|
|
|
SmallVector<IndexEntry, 4> IndexEntries;
|
|
|
|
outs() << " Top level indices: (count = " << NumIndices << ")\n";
|
|
Pos = Contents.data() + IndicesStart;
|
|
for (unsigned i = 0; i < NumIndices; ++i) {
|
|
IndexEntry Entry;
|
|
|
|
Entry.FunctionOffset = readNext<uint32_t>(Pos);
|
|
Entry.SecondLevelPageStart = readNext<uint32_t>(Pos);
|
|
Entry.LSDAStart = readNext<uint32_t>(Pos);
|
|
IndexEntries.push_back(Entry);
|
|
|
|
outs() << " [" << i << "]: "
|
|
<< "function offset="
|
|
<< format("0x%08" PRIx32, Entry.FunctionOffset) << ", "
|
|
<< "2nd level page offset="
|
|
<< format("0x%08" PRIx32, Entry.SecondLevelPageStart) << ", "
|
|
<< "LSDA offset="
|
|
<< format("0x%08" PRIx32, Entry.LSDAStart) << '\n';
|
|
}
|
|
|
|
|
|
//===----------------------------------
|
|
// Next come the LSDA tables
|
|
//===----------------------------------
|
|
|
|
// The LSDA layout is rather implicit: it's a contiguous array of entries from
|
|
// the first top-level index's LSDAOffset to the last (sentinel).
|
|
|
|
outs() << " LSDA descriptors:\n";
|
|
Pos = Contents.data() + IndexEntries[0].LSDAStart;
|
|
int NumLSDAs = (IndexEntries.back().LSDAStart - IndexEntries[0].LSDAStart) /
|
|
(2 * sizeof(uint32_t));
|
|
for (int i = 0; i < NumLSDAs; ++i) {
|
|
uint32_t FunctionOffset = readNext<uint32_t>(Pos);
|
|
uint32_t LSDAOffset = readNext<uint32_t>(Pos);
|
|
outs() << " [" << i << "]: "
|
|
<< "function offset="
|
|
<< format("0x%08" PRIx32, FunctionOffset) << ", "
|
|
<< "LSDA offset="
|
|
<< format("0x%08" PRIx32, LSDAOffset) << '\n';
|
|
}
|
|
|
|
//===----------------------------------
|
|
// Finally, the 2nd level indices
|
|
//===----------------------------------
|
|
|
|
// Generally these are 4K in size, and have 2 possible forms:
|
|
// + Regular stores up to 511 entries with disparate encodings
|
|
// + Compressed stores up to 1021 entries if few enough compact encoding
|
|
// values are used.
|
|
outs() << " Second level indices:\n";
|
|
for (unsigned i = 0; i < IndexEntries.size() - 1; ++i) {
|
|
// The final sentinel top-level index has no associated 2nd level page
|
|
if (IndexEntries[i].SecondLevelPageStart == 0)
|
|
break;
|
|
|
|
outs() << " Second level index[" << i << "]: "
|
|
<< "offset in section="
|
|
<< format("0x%08" PRIx32, IndexEntries[i].SecondLevelPageStart)
|
|
<< ", "
|
|
<< "base function offset="
|
|
<< format("0x%08" PRIx32, IndexEntries[i].FunctionOffset) << '\n';
|
|
|
|
Pos = Contents.data() + IndexEntries[i].SecondLevelPageStart;
|
|
uint32_t Kind = *(support::ulittle32_t *)Pos;
|
|
if (Kind == 2)
|
|
printRegularSecondLevelUnwindPage(Pos);
|
|
else if (Kind == 3)
|
|
printCompressedSecondLevelUnwindPage(Pos, IndexEntries[i].FunctionOffset,
|
|
CommonEncodings);
|
|
else
|
|
llvm_unreachable("Do not know how to print this kind of 2nd level page");
|
|
|
|
}
|
|
}
|
|
|
|
void llvm::printMachOUnwindInfo(const MachOObjectFile *Obj) {
|
|
std::map<uint64_t, SymbolRef> Symbols;
|
|
for (const SymbolRef &SymRef : Obj->symbols()) {
|
|
// Discard any undefined or absolute symbols. They're not going to take part
|
|
// in the convenience lookup for unwind info and just take up resources.
|
|
section_iterator Section = Obj->section_end();
|
|
SymRef.getSection(Section);
|
|
if (Section == Obj->section_end())
|
|
continue;
|
|
|
|
uint64_t Addr;
|
|
SymRef.getAddress(Addr);
|
|
Symbols.insert(std::make_pair(Addr, SymRef));
|
|
}
|
|
|
|
for (const SectionRef &Section : Obj->sections()) {
|
|
StringRef SectName;
|
|
Section.getName(SectName);
|
|
if (SectName == "__compact_unwind")
|
|
printMachOCompactUnwindSection(Obj, Symbols, Section);
|
|
else if (SectName == "__unwind_info")
|
|
printMachOUnwindInfoSection(Obj, Symbols, Section);
|
|
else if (SectName == "__eh_frame")
|
|
outs() << "llvm-objdump: warning: unhandled __eh_frame section\n";
|
|
|
|
}
|
|
}
|