printLazyBindTable(MachOOF);
if (WeakBind)
printWeakBindTable(MachOOF);
-
- if (DwarfDumpType != DIDT_Null) {
- std::unique_ptr<DIContext> DICtx(new DWARFContextInMemory(*MachOOF));
- // Dump the complete DWARF structure.
- DICtx->dump(outs(), DwarfDumpType, true /* DumpEH */);
- }
}
// printUnknownCPUType() helps print_fat_headers for unknown CPU's.
}
}
+static unsigned getSizeForEncoding(bool is64Bit,
+ unsigned symbolEncoding) {
+ unsigned format = symbolEncoding & 0x0f;
+ switch (format) {
+ default: llvm_unreachable("Unknown Encoding");
+ case dwarf::DW_EH_PE_absptr:
+ case dwarf::DW_EH_PE_signed:
+ return is64Bit ? 8 : 4;
+ case dwarf::DW_EH_PE_udata2:
+ case dwarf::DW_EH_PE_sdata2:
+ return 2;
+ case dwarf::DW_EH_PE_udata4:
+ case dwarf::DW_EH_PE_sdata4:
+ return 4;
+ case dwarf::DW_EH_PE_udata8:
+ case dwarf::DW_EH_PE_sdata8:
+ return 8;
+ }
+}
+
+static uint64_t readPointer(const char *&Pos, bool is64Bit, unsigned Encoding) {
+ switch (getSizeForEncoding(is64Bit, Encoding)) {
+ case 2:
+ return readNext<uint16_t>(Pos);
+ break;
+ case 4:
+ return readNext<uint32_t>(Pos);
+ break;
+ case 8:
+ return readNext<uint64_t>(Pos);
+ break;
+ default:
+ llvm_unreachable("Illegal data size");
+ }
+}
+
+static void printMachOEHFrameSection(const MachOObjectFile *Obj,
+ std::map<uint64_t, SymbolRef> &Symbols,
+ const SectionRef &EHFrame) {
+ if (!Obj->isLittleEndian()) {
+ outs() << "warning: cannot handle big endian __eh_frame section\n";
+ return;
+ }
+
+ bool is64Bit = Obj->is64Bit();
+
+ outs() << "Contents of __eh_frame section:\n";
+
+ StringRef Contents;
+ EHFrame.getContents(Contents);
+
+ /// A few fields of the CIE are used when decoding the FDE's. This struct
+ /// will cache those fields we need so that we don't have to decode it
+ /// repeatedly for each FDE that references it.
+ struct DecodedCIE {
+ Optional<uint32_t> FDEPointerEncoding;
+ Optional<uint32_t> LSDAPointerEncoding;
+ bool hasAugmentationLength;
+ };
+
+ // Map from the start offset of the CIE to the cached data for that CIE.
+ DenseMap<uint64_t, DecodedCIE> CachedCIEs;
+
+ for (const char *Pos = Contents.data(), *End = Contents.end(); Pos != End; ) {
+
+ const char *EntryStartPos = Pos;
+
+ uint64_t Length = readNext<uint32_t>(Pos);
+ if (Length == 0xffffffff)
+ Length = readNext<uint64_t>(Pos);
+
+ // Save the Pos so that we can check the length we encoded against what we
+ // end up decoding.
+ const char *PosAfterLength = Pos;
+ const char *EntryEndPos = PosAfterLength + Length;
+
+ assert(EntryEndPos <= End &&
+ "__eh_frame entry length exceeds section size");
+
+ uint32_t ID = readNext<uint32_t>(Pos);
+ if (ID == 0) {
+ // This is a CIE.
+
+ uint32_t Version = readNext<uint8_t>(Pos);
+
+ // Parse a null terminated augmentation string
+ SmallString<8> AugmentationString;
+ for (uint8_t Char = readNext<uint8_t>(Pos); Char;
+ Char = readNext<uint8_t>(Pos))
+ AugmentationString.push_back(Char);
+
+ // Optionally parse the EH data if the augmentation string says it's there.
+ Optional<uint64_t> EHData;
+ if (StringRef(AugmentationString).count("eh"))
+ EHData = is64Bit ? readNext<uint64_t>(Pos) : readNext<uint32_t>(Pos);
+
+ unsigned ULEBByteCount;
+ uint64_t CodeAlignmentFactor = decodeULEB128((const uint8_t *)Pos,
+ &ULEBByteCount);
+ Pos += ULEBByteCount;
+
+ int64_t DataAlignmentFactor = decodeSLEB128((const uint8_t *)Pos,
+ &ULEBByteCount);
+ Pos += ULEBByteCount;
+
+ uint32_t ReturnAddressRegister = readNext<uint8_t>(Pos);
+
+ Optional<uint64_t> AugmentationLength;
+ Optional<uint32_t> LSDAPointerEncoding;
+ Optional<uint32_t> PersonalityEncoding;
+ Optional<uint64_t> Personality;
+ Optional<uint32_t> FDEPointerEncoding;
+ if (!AugmentationString.empty() && AugmentationString.front() == 'z') {
+ AugmentationLength = decodeULEB128((const uint8_t *)Pos,
+ &ULEBByteCount);
+ Pos += ULEBByteCount;
+
+ // Walk the augmentation string to get all the augmentation data.
+ for (unsigned i = 1, e = AugmentationString.size(); i != e; ++i) {
+ char Char = AugmentationString[i];
+ switch (Char) {
+ case 'e':
+ assert((i + 1) != e && AugmentationString[i + 1] == 'h' &&
+ "Expected 'eh' in augmentation string");
+ break;
+ case 'L':
+ assert(!LSDAPointerEncoding && "Duplicate LSDA encoding");
+ LSDAPointerEncoding = readNext<uint8_t>(Pos);
+ break;
+ case 'P': {
+ assert(!Personality && "Duplicate personality");
+ PersonalityEncoding = readNext<uint8_t>(Pos);
+ Personality = readPointer(Pos, is64Bit, *PersonalityEncoding);
+ break;
+ }
+ case 'R':
+ assert(!FDEPointerEncoding && "Duplicate FDE encoding");
+ FDEPointerEncoding = readNext<uint8_t>(Pos);
+ break;
+ case 'z':
+ llvm_unreachable("'z' must be first in the augmentation string");
+ }
+ }
+ }
+
+ outs() << "CIE:\n";
+ outs() << " Length: " << Length << "\n";
+ outs() << " CIE ID: " << ID << "\n";
+ outs() << " Version: " << Version << "\n";
+ outs() << " Augmentation String: " << AugmentationString << "\n";
+ if (EHData)
+ outs() << " EHData: " << *EHData << "\n";
+ outs() << " Code Alignment Factor: " << CodeAlignmentFactor << "\n";
+ outs() << " Data Alignment Factor: " << DataAlignmentFactor << "\n";
+ outs() << " Return Address Register: " << ReturnAddressRegister << "\n";
+ if (AugmentationLength) {
+ outs() << " Augmentation Data Length: " << *AugmentationLength << "\n";
+ if (LSDAPointerEncoding) {
+ outs() << " FDE LSDA Pointer Encoding: "
+ << *LSDAPointerEncoding << "\n";
+ }
+ if (Personality) {
+ outs() << " Personality Encoding: " << *PersonalityEncoding << "\n";
+ outs() << " Personality: " << *Personality << "\n";
+ }
+ if (FDEPointerEncoding) {
+ outs() << " FDE Address Pointer Encoding: "
+ << *FDEPointerEncoding << "\n";
+ }
+ }
+ // FIXME: Handle instructions.
+ // For now just emit some bytes
+ outs() << " Instructions:\n ";
+ dumpBytes(makeArrayRef((const uint8_t*)Pos, (const uint8_t*)EntryEndPos),
+ outs());
+ outs() << "\n";
+ Pos = EntryEndPos;
+
+ // Cache this entry.
+ uint64_t Offset = EntryStartPos - Contents.data();
+ CachedCIEs[Offset] = { FDEPointerEncoding, LSDAPointerEncoding,
+ AugmentationLength.hasValue() };
+ continue;
+ }
+
+ // This is an FDE.
+ // The CIE pointer for an FDE is the same location as the ID which we
+ // already read.
+ uint32_t CIEPointer = ID;
+
+ const char *CIEStart = PosAfterLength - CIEPointer;
+ assert(CIEStart >= Contents.data() &&
+ "FDE points to CIE before the __eh_frame start");
+
+ uint64_t CIEOffset = CIEStart - Contents.data();
+ auto CIEIt = CachedCIEs.find(CIEOffset);
+ if (CIEIt == CachedCIEs.end())
+ llvm_unreachable("Couldn't find CIE at offset in to __eh_frame section");
+
+ const DecodedCIE &CIE = CIEIt->getSecond();
+ assert(CIE.FDEPointerEncoding &&
+ "FDE references CIE which did not set pointer encoding");
+
+ uint64_t PCPointerSize = getSizeForEncoding(is64Bit,
+ *CIE.FDEPointerEncoding);
+
+ uint64_t PCBegin = readPointer(Pos, is64Bit, *CIE.FDEPointerEncoding);
+ uint64_t PCRange = readPointer(Pos, is64Bit, *CIE.FDEPointerEncoding);
+
+ Optional<uint64_t> AugmentationLength;
+ uint32_t LSDAPointerSize;
+ Optional<uint64_t> LSDAPointer;
+ if (CIE.hasAugmentationLength) {
+ unsigned ULEBByteCount;
+ AugmentationLength = decodeULEB128((const uint8_t *)Pos,
+ &ULEBByteCount);
+ Pos += ULEBByteCount;
+
+ // Decode the LSDA if the CIE augmentation string said we should.
+ if (CIE.LSDAPointerEncoding) {
+ LSDAPointerSize = getSizeForEncoding(is64Bit, *CIE.LSDAPointerEncoding);
+ LSDAPointer = readPointer(Pos, is64Bit, *CIE.LSDAPointerEncoding);
+ }
+ }
+
+ outs() << "FDE:\n";
+ outs() << " Length: " << Length << "\n";
+ outs() << " CIE Offset: " << CIEOffset << "\n";
+
+ if (PCPointerSize == 8) {
+ outs() << format(" PC Begin: %016" PRIx64, PCBegin) << "\n";
+ outs() << format(" PC Range: %016" PRIx64, PCRange) << "\n";
+ } else {
+ outs() << format(" PC Begin: %08" PRIx64, PCBegin) << "\n";
+ outs() << format(" PC Range: %08" PRIx64, PCRange) << "\n";
+ }
+ if (AugmentationLength) {
+ outs() << " Augmentation Data Length: " << *AugmentationLength << "\n";
+ if (LSDAPointer) {
+ if (LSDAPointerSize == 8)
+ outs() << format(" LSDA Pointer: %016\n" PRIx64, *LSDAPointer);
+ else
+ outs() << format(" LSDA Pointer: %08\n" PRIx64, *LSDAPointer);
+ }
+ }
+
+ // FIXME: Handle instructions.
+ // For now just emit some bytes
+ outs() << " Instructions:\n ";
+ dumpBytes(makeArrayRef((const uint8_t*)Pos, (const uint8_t*)EntryEndPos),
+ outs());
+ outs() << "\n";
+ Pos = EntryEndPos;
+ }
+}
+
void llvm::printMachOUnwindInfo(const MachOObjectFile *Obj) {
std::map<uint64_t, SymbolRef> Symbols;
for (const SymbolRef &SymRef : Obj->symbols()) {
printMachOCompactUnwindSection(Obj, Symbols, Section);
else if (SectName == "__unwind_info")
printMachOUnwindInfoSection(Obj, Symbols, Section);
+ else if (SectName == "__eh_frame")
+ printMachOEHFrameSection(Obj, Symbols, Section);
}
}
projects / oota-llvm.git / blobdiff