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//===- DWARFDebugRnglists.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/DWARFDebugRnglists.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
Error RangeListEntry::extract(DWARFDataExtractor Data, uint64_t *OffsetPtr) {
Offset = *OffsetPtr;
SectionIndex = -1ULL;
// The caller should guarantee that we have at least 1 byte available, so
// we just assert instead of revalidate.
assert(*OffsetPtr < Data.size() &&
"not enough space to extract a rangelist encoding");
uint8_t Encoding = Data.getU8(OffsetPtr);
DataExtractor::Cursor C(*OffsetPtr);
switch (Encoding) {
case dwarf::DW_RLE_end_of_list:
Value0 = Value1 = 0;
break;
// TODO: Support other encodings.
case dwarf::DW_RLE_base_addressx: {
Value0 = Data.getULEB128(C);
break;
}
case dwarf::DW_RLE_startx_endx:
Value0 = Data.getULEB128(C);
Value1 = Data.getULEB128(C);
break;
case dwarf::DW_RLE_startx_length: {
Value0 = Data.getULEB128(C);
Value1 = Data.getULEB128(C);
break;
}
case dwarf::DW_RLE_offset_pair: {
Value0 = Data.getULEB128(C);
Value1 = Data.getULEB128(C);
break;
}
case dwarf::DW_RLE_base_address: {
Value0 = Data.getRelocatedAddress(C, &SectionIndex);
break;
}
case dwarf::DW_RLE_start_end: {
Value0 = Data.getRelocatedAddress(C, &SectionIndex);
Value1 = Data.getRelocatedAddress(C);
break;
}
case dwarf::DW_RLE_start_length: {
Value0 = Data.getRelocatedAddress(C, &SectionIndex);
Value1 = Data.getULEB128(C);
break;
}
default:
consumeError(C.takeError());
return createStringError(errc::not_supported,
"unknown rnglists encoding 0x%" PRIx32
" at offset 0x%" PRIx64,
uint32_t(Encoding), Offset);
}
if (!C) {
consumeError(C.takeError());
return createStringError(
errc::invalid_argument,
"read past end of table when reading %s encoding at offset 0x%" PRIx64,
dwarf::RLEString(Encoding).data(), Offset);
}
*OffsetPtr = C.tell();
EntryKind = Encoding;
return Error::success();
}
DWARFAddressRangesVector DWARFDebugRnglist::getAbsoluteRanges(
std::optional<object::SectionedAddress> BaseAddr, DWARFUnit &U) const {
return getAbsoluteRanges(
BaseAddr, U.getAddressByteSize(),
[&](uint32_t Index) { return U.getAddrOffsetSectionItem(Index); });
}
DWARFAddressRangesVector DWARFDebugRnglist::getAbsoluteRanges(
std::optional<object::SectionedAddress> BaseAddr, uint8_t AddressByteSize,
function_ref<std::optional<object::SectionedAddress>(uint32_t)>
LookupPooledAddress) const {
DWARFAddressRangesVector Res;
uint64_t Tombstone = dwarf::computeTombstoneAddress(AddressByteSize);
for (const RangeListEntry &RLE : Entries) {
if (RLE.EntryKind == dwarf::DW_RLE_end_of_list)
break;
if (RLE.EntryKind == dwarf::DW_RLE_base_addressx) {
BaseAddr = LookupPooledAddress(RLE.Value0);
if (!BaseAddr)
BaseAddr = {RLE.Value0, -1ULL};
continue;
}
if (RLE.EntryKind == dwarf::DW_RLE_base_address) {
BaseAddr = {RLE.Value0, RLE.SectionIndex};
continue;
}
DWARFAddressRange E;
E.SectionIndex = RLE.SectionIndex;
if (BaseAddr && E.SectionIndex == -1ULL)
E.SectionIndex = BaseAddr->SectionIndex;
switch (RLE.EntryKind) {
case dwarf::DW_RLE_offset_pair:
E.LowPC = RLE.Value0;
if (E.LowPC == Tombstone)
continue;
E.HighPC = RLE.Value1;
if (BaseAddr) {
if (BaseAddr->Address == Tombstone)
continue;
E.LowPC += BaseAddr->Address;
E.HighPC += BaseAddr->Address;
}
break;
case dwarf::DW_RLE_start_end:
E.LowPC = RLE.Value0;
E.HighPC = RLE.Value1;
break;
case dwarf::DW_RLE_start_length:
E.LowPC = RLE.Value0;
E.HighPC = E.LowPC + RLE.Value1;
break;
case dwarf::DW_RLE_startx_length: {
auto Start = LookupPooledAddress(RLE.Value0);
if (!Start)
Start = {0, -1ULL};
E.SectionIndex = Start->SectionIndex;
E.LowPC = Start->Address;
E.HighPC = E.LowPC + RLE.Value1;
break;
}
case dwarf::DW_RLE_startx_endx: {
auto Start = LookupPooledAddress(RLE.Value0);
if (!Start)
Start = {0, -1ULL};
auto End = LookupPooledAddress(RLE.Value1);
if (!End)
End = {0, -1ULL};
// FIXME: Some error handling if Start.SectionIndex != End.SectionIndex
E.SectionIndex = Start->SectionIndex;
E.LowPC = Start->Address;
E.HighPC = End->Address;
break;
}
default:
// Unsupported encodings should have been reported during extraction,
// so we should not run into any here.
llvm_unreachable("Unsupported range list encoding");
}
if (E.LowPC == Tombstone)
continue;
Res.push_back(E);
}
return Res;
}
void RangeListEntry::dump(
raw_ostream &OS, uint8_t AddrSize, uint8_t MaxEncodingStringLength,
uint64_t &CurrentBase, DIDumpOptions DumpOpts,
llvm::function_ref<std::optional<object::SectionedAddress>(uint32_t)>
LookupPooledAddress) const {
auto PrintRawEntry = [](raw_ostream &OS, const RangeListEntry &Entry,
uint8_t AddrSize, DIDumpOptions DumpOpts) {
if (DumpOpts.Verbose) {
DumpOpts.DisplayRawContents = true;
DWARFAddressRange(Entry.Value0, Entry.Value1)
.dump(OS, AddrSize, DumpOpts);
OS << " => ";
}
};
if (DumpOpts.Verbose) {
// Print the section offset in verbose mode.
OS << format("0x%8.8" PRIx64 ":", Offset);
auto EncodingString = dwarf::RangeListEncodingString(EntryKind);
// Unsupported encodings should have been reported during parsing.
assert(!EncodingString.empty() && "Unknown range entry encoding");
OS << format(" [%s%*c", EncodingString.data(),
MaxEncodingStringLength - EncodingString.size() + 1, ']');
if (EntryKind != dwarf::DW_RLE_end_of_list)
OS << ": ";
}
uint64_t Tombstone = dwarf::computeTombstoneAddress(AddrSize);
switch (EntryKind) {
case dwarf::DW_RLE_end_of_list:
OS << (DumpOpts.Verbose ? "" : "<End of list>");
break;
case dwarf::DW_RLE_base_addressx: {
if (auto SA = LookupPooledAddress(Value0))
CurrentBase = SA->Address;
else
CurrentBase = Value0;
if (!DumpOpts.Verbose)
return;
DWARFFormValue::dumpAddress(OS << ' ', AddrSize, Value0);
break;
}
case dwarf::DW_RLE_base_address:
// In non-verbose mode we do not print anything for this entry.
CurrentBase = Value0;
if (!DumpOpts.Verbose)
return;
DWARFFormValue::dumpAddress(OS << ' ', AddrSize, Value0);
break;
case dwarf::DW_RLE_start_length:
PrintRawEntry(OS, *this, AddrSize, DumpOpts);
DWARFAddressRange(Value0, Value0 + Value1).dump(OS, AddrSize, DumpOpts);
break;
case dwarf::DW_RLE_offset_pair:
PrintRawEntry(OS, *this, AddrSize, DumpOpts);
if (CurrentBase != Tombstone)
DWARFAddressRange(Value0 + CurrentBase, Value1 + CurrentBase)
.dump(OS, AddrSize, DumpOpts);
else
OS << "dead code";
break;
case dwarf::DW_RLE_start_end:
DWARFAddressRange(Value0, Value1).dump(OS, AddrSize, DumpOpts);
break;
case dwarf::DW_RLE_startx_length: {
PrintRawEntry(OS, *this, AddrSize, DumpOpts);
uint64_t Start = 0;
if (auto SA = LookupPooledAddress(Value0))
Start = SA->Address;
DWARFAddressRange(Start, Start + Value1).dump(OS, AddrSize, DumpOpts);
break;
}
case dwarf::DW_RLE_startx_endx: {
PrintRawEntry(OS, *this, AddrSize, DumpOpts);
uint64_t Start = 0;
if (auto SA = LookupPooledAddress(Value0))
Start = SA->Address;
uint64_t End = 0;
if (auto SA = LookupPooledAddress(Value1))
End = SA->Address;
DWARFAddressRange(Start, End).dump(OS, AddrSize, DumpOpts);
break;
}
default:
llvm_unreachable("Unsupported range list encoding");
}
OS << "\n";
}
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