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https://github.com/c64scene-ar/llvm-6502.git
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efdbec8b0a
None of the object file formats reported error on iterator increment. In retrospect, that is not too surprising: no object format stores symbols or sections in a linked list or other structure that requires chasing pointers. As a consequence, all error checking can be done on begin() and end(). This reduces the text segment of bin/llvm-readobj in my machine from 521233 to 518526 bytes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200442 91177308-0d34-0410-b5e6-96231b3b80d8
468 lines
15 KiB
C++
468 lines
15 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/OwningPtr.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/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/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 "llvm/Support/system_error.h"
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#include <algorithm>
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#include <cstring>
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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 0;
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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
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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 (symbol_iterator SI = MachOObj->begin_symbols(),
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SE = MachOObj->end_symbols();
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SI != SE; ++SI)
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Symbols.push_back(*SI);
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for (section_iterator SI = MachOObj->begin_sections(),
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SE = MachOObj->end_sections();
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SI != SE; ++SI) {
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SectionRef SR = *SI;
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StringRef SectName;
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SR.getName(SectName);
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Sections.push_back(*SI);
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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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OwningPtr<MemoryBuffer> Buff;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
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errs() << "llvm-objdump: " << Filename << ": " << ec.message() << "\n";
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return;
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}
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OwningPtr<MachOObjectFile> MachOOF(static_cast<MachOObjectFile *>(
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ObjectFile::createMachOObjectFile(Buff.take()).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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OwningPtr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
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OwningPtr<MCInstrAnalysis>
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InstrAnalysis(TheTarget->createMCInstrAnalysis(InstrInfo.get()));
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// Set up disassembler.
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OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
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OwningPtr<const MCAsmInfo> AsmInfo(
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TheTarget->createMCAsmInfo(*MRI, TripleName));
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OwningPtr<const MCSubtargetInfo>
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STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
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OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
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int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
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OwningPtr<MCInstPrinter>
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IP(TheTarget->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *InstrInfo,
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*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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OwningPtr<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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OwningPtr<MemoryBuffer> Buf;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(DSYMFile, Buf)) {
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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.take()).get();
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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 (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
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RE = Sections[SectIdx].end_relocations();
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RI != RE; ++RI) {
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uint64_t RelocOffset, SectionAddress;
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RI->getOffset(RelocOffset);
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Sections[SectIdx].getAddress(SectionAddress);
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RelocOffset -= SectionAddress;
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symbol_iterator RelocSym = RI->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.getLine() != 0)
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outs() << "\t## " << dli.getFileName() << ':'
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<< dli.getLine() << ':' << dli.getColumn();
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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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