Line data    Source code

       1             : //===- DWARFDataExtractor.cpp ---------------------------------------------===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : 
      10             : #include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
      11             : #include "llvm/BinaryFormat/Dwarf.h"
      12             : #include "llvm/DebugInfo/DWARF/DWARFContext.h"
      13             : 
      14             : using namespace llvm;
      15             : 
      16       77432 : uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint32_t *Off,
      17             :                                                uint64_t *SecNdx) const {
      18       77432 :   if (SecNdx)
      19       16783 :     *SecNdx = -1ULL;
      20       77432 :   if (!Section)
      21        3867 :     return getUnsigned(Off, Size);
      22       73565 :   Optional<RelocAddrEntry> Rel = Obj->find(*Section, *Off);
      23       73565 :   if (!Rel)
      24       59643 :     return getUnsigned(Off, Size);
      25       13922 :   if (SecNdx)
      26        1233 :     *SecNdx = Rel->SectionIndex;
      27       13922 :   return getUnsigned(Off, Size) + Rel->Value;
      28             : }
      29             : 
      30             : Optional<uint64_t>
      31         498 : DWARFDataExtractor::getEncodedPointer(uint32_t *Offset, uint8_t Encoding,
      32             :                                       uint64_t PCRelOffset) const {
      33         498 :   if (Encoding == dwarf::DW_EH_PE_omit)
      34             :     return None;
      35             : 
      36             :   uint64_t Result = 0;
      37         498 :   uint32_t OldOffset = *Offset;
      38             :   // First get value
      39         498 :   switch (Encoding & 0x0F) {
      40         207 :   case dwarf::DW_EH_PE_absptr:
      41         207 :     switch (getAddressSize()) {
      42         207 :     case 2:
      43             :     case 4:
      44             :     case 8:
      45         207 :       Result = getUnsigned(Offset, getAddressSize());
      46             :       break;
      47             :     default:
      48             :       return None;
      49             :     }
      50         207 :     break;
      51           0 :   case dwarf::DW_EH_PE_uleb128:
      52           0 :     Result = getULEB128(Offset);
      53           0 :     break;
      54           0 :   case dwarf::DW_EH_PE_sleb128:
      55           0 :     Result = getSLEB128(Offset);
      56           0 :     break;
      57           0 :   case dwarf::DW_EH_PE_udata2:
      58           0 :     Result = getUnsigned(Offset, 2);
      59           0 :     break;
      60           7 :   case dwarf::DW_EH_PE_udata4:
      61           7 :     Result = getUnsigned(Offset, 4);
      62           7 :     break;
      63           0 :   case dwarf::DW_EH_PE_udata8:
      64           0 :     Result = getUnsigned(Offset, 8);
      65           0 :     break;
      66           0 :   case dwarf::DW_EH_PE_sdata2:
      67           0 :     Result = getSigned(Offset, 2);
      68           0 :     break;
      69         280 :   case dwarf::DW_EH_PE_sdata4:
      70         280 :     Result = getSigned(Offset, 4);
      71         280 :     break;
      72           4 :   case dwarf::DW_EH_PE_sdata8:
      73           4 :     Result = getSigned(Offset, 8);
      74           4 :     break;
      75             :   default:
      76             :     return None;
      77             :   }
      78             :   // Then add relative offset, if required
      79         498 :   switch (Encoding & 0x70) {
      80             :   case dwarf::DW_EH_PE_absptr:
      81             :     // do nothing
      82             :     break;
      83         468 :   case dwarf::DW_EH_PE_pcrel:
      84         468 :     Result += PCRelOffset;
      85         468 :     break;
      86           0 :   case dwarf::DW_EH_PE_datarel:
      87             :   case dwarf::DW_EH_PE_textrel:
      88             :   case dwarf::DW_EH_PE_funcrel:
      89             :   case dwarf::DW_EH_PE_aligned:
      90             :   default:
      91           0 :     *Offset = OldOffset;
      92             :     return None;
      93             :   }
      94             : 
      95             :   return Result;
      96             : }