2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
//===- DWARFDataExtractor.cpp ---------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#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;
|
|
}
|