136 lines
3.7 KiB
C++
136 lines
3.7 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/DebugInfo/DWARF/DWARFContext.h"
|
|
|
|
using namespace llvm;
|
|
|
|
std::pair<uint64_t, dwarf::DwarfFormat>
|
|
DWARFDataExtractor::getInitialLength(uint64_t *Off, Error *Err) const {
|
|
ErrorAsOutParameter ErrAsOut(Err);
|
|
if (Err && *Err)
|
|
return {0, dwarf::DWARF32};
|
|
|
|
Cursor C(*Off);
|
|
uint64_t Length = getRelocatedValue(C, 4);
|
|
dwarf::DwarfFormat Format = dwarf::DWARF32;
|
|
if (Length == dwarf::DW_LENGTH_DWARF64) {
|
|
Length = getRelocatedValue(C, 8);
|
|
Format = dwarf::DWARF64;
|
|
} else if (Length >= dwarf::DW_LENGTH_lo_reserved) {
|
|
cantFail(C.takeError());
|
|
if (Err)
|
|
*Err = createStringError(
|
|
errc::invalid_argument,
|
|
"unsupported reserved unit length of value 0x%8.8" PRIx64, Length);
|
|
return {0, dwarf::DWARF32};
|
|
}
|
|
|
|
if (C) {
|
|
*Off = C.tell();
|
|
return {Length, Format};
|
|
}
|
|
if (Err)
|
|
*Err = C.takeError();
|
|
else
|
|
consumeError(C.takeError());
|
|
return {0, dwarf::DWARF32};
|
|
}
|
|
|
|
uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint64_t *Off,
|
|
uint64_t *SecNdx,
|
|
Error *Err) const {
|
|
if (SecNdx)
|
|
*SecNdx = object::SectionedAddress::UndefSection;
|
|
if (!Section)
|
|
return getUnsigned(Off, Size, Err);
|
|
|
|
ErrorAsOutParameter ErrAsOut(Err);
|
|
Optional<RelocAddrEntry> E = Obj->find(*Section, *Off);
|
|
uint64_t LocData = getUnsigned(Off, Size, Err);
|
|
if (!E || (Err && *Err))
|
|
return LocData;
|
|
if (SecNdx)
|
|
*SecNdx = E->SectionIndex;
|
|
|
|
uint64_t R =
|
|
object::resolveRelocation(E->Resolver, E->Reloc, E->SymbolValue, LocData);
|
|
if (E->Reloc2)
|
|
R = object::resolveRelocation(E->Resolver, *E->Reloc2, E->SymbolValue2, R);
|
|
return R;
|
|
}
|
|
|
|
Optional<uint64_t>
|
|
DWARFDataExtractor::getEncodedPointer(uint64_t *Offset, uint8_t Encoding,
|
|
uint64_t PCRelOffset) const {
|
|
if (Encoding == dwarf::DW_EH_PE_omit)
|
|
return None;
|
|
|
|
uint64_t Result = 0;
|
|
uint64_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 = SignExtend64<32>(getRelocatedValue(4, Offset));
|
|
break;
|
|
case dwarf::DW_EH_PE_sdata8:
|
|
Result = getRelocatedValue(8, Offset);
|
|
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;
|
|
}
|