| //===- DWARFDataExtractor.cpp ---------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h" |
| #include "llvm/BinaryFormat/Dwarf.h" |
| #include "llvm/DebugInfo/DWARF/DWARFContext.h" |
| |
| using namespace llvm; |
| |
| uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint32_t *Off, |
| uint64_t *SecNdx) const { |
| if (SecNdx) |
| *SecNdx = -1ULL; |
| if (!Section) |
| return getUnsigned(Off, Size); |
| Optional<RelocAddrEntry> Rel = Obj->find(*Section, *Off); |
| if (!Rel) |
| return getUnsigned(Off, Size); |
| if (SecNdx) |
| *SecNdx = Rel->SectionIndex; |
| return getUnsigned(Off, Size) + Rel->Value; |
| } |
| |
| Optional<uint64_t> |
| DWARFDataExtractor::getEncodedPointer(uint32_t *Offset, uint8_t Encoding, |
| uint64_t PCRelOffset) const { |
| if (Encoding == dwarf::DW_EH_PE_omit) |
| return None; |
| |
| uint64_t Result = 0; |
| uint32_t OldOffset = *Offset; |
| // First get value |
| switch (Encoding & 0x0F) { |
| case dwarf::DW_EH_PE_absptr: |
| switch (getAddressSize()) { |
| case 2: |
| case 4: |
| case 8: |
| Result = getUnsigned(Offset, getAddressSize()); |
| break; |
| default: |
| return None; |
| } |
| break; |
| case dwarf::DW_EH_PE_uleb128: |
| Result = getULEB128(Offset); |
| break; |
| case dwarf::DW_EH_PE_sleb128: |
| Result = getSLEB128(Offset); |
| break; |
| case dwarf::DW_EH_PE_udata2: |
| Result = getUnsigned(Offset, 2); |
| break; |
| case dwarf::DW_EH_PE_udata4: |
| Result = getUnsigned(Offset, 4); |
| break; |
| case dwarf::DW_EH_PE_udata8: |
| Result = getUnsigned(Offset, 8); |
| break; |
| case dwarf::DW_EH_PE_sdata2: |
| Result = getSigned(Offset, 2); |
| break; |
| case dwarf::DW_EH_PE_sdata4: |
| Result = getSigned(Offset, 4); |
| break; |
| case dwarf::DW_EH_PE_sdata8: |
| Result = getSigned(Offset, 8); |
| break; |
| default: |
| return None; |
| } |
| // Then add relative offset, if required |
| switch (Encoding & 0x70) { |
| case dwarf::DW_EH_PE_absptr: |
| // do nothing |
| break; |
| case dwarf::DW_EH_PE_pcrel: |
| Result += PCRelOffset; |
| break; |
| case dwarf::DW_EH_PE_datarel: |
| case dwarf::DW_EH_PE_textrel: |
| case dwarf::DW_EH_PE_funcrel: |
| case dwarf::DW_EH_PE_aligned: |
| default: |
| *Offset = OldOffset; |
| return None; |
| } |
| |
| return Result; |
| } |