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//===- DWARFDebugRangesList.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/DWARFDebugRangeList.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cinttypes>
#include <cstdint>
using namespace llvm;
bool DWARFDebugRangeList::RangeListEntry::isBaseAddressSelectionEntry(
uint8_t AddressSize) const {
assert(DWARFContext::isAddressSizeSupported(AddressSize));
return StartAddress == dwarf::computeTombstoneAddress(AddressSize);
}
void DWARFDebugRangeList::clear() {
Offset = -1ULL;
AddressSize = 0;
Entries.clear();
}
Error DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
uint64_t *offset_ptr) {
clear();
if (!data.isValidOffset(*offset_ptr))
return createStringError(errc::invalid_argument,
"invalid range list offset 0x%" PRIx64, *offset_ptr);
AddressSize = data.getAddressSize();
if (Error SizeErr = DWARFContext::checkAddressSizeSupported(
AddressSize, errc::invalid_argument,
"range list at offset 0x%" PRIx64, *offset_ptr))
return SizeErr;
Offset = *offset_ptr;
while (true) {
RangeListEntry Entry;
Entry.SectionIndex = -1ULL;
uint64_t prev_offset = *offset_ptr;
Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
Entry.EndAddress =
data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);
// Check that both values were extracted correctly.
if (*offset_ptr != prev_offset + 2 * AddressSize) {
clear();
return createStringError(errc::invalid_argument,
"invalid range list entry at offset 0x%" PRIx64,
prev_offset);
}
if (Entry.isEndOfListEntry())
break;
Entries.push_back(Entry);
}
return Error::success();
}
void DWARFDebugRangeList::dump(raw_ostream &OS) const {
const char *AddrFmt;
switch (AddressSize) {
case 2:
AddrFmt = "%08" PRIx64 " %04" PRIx64 " %04" PRIx64 "\n";
break;
case 4:
AddrFmt = "%08" PRIx64 " %08" PRIx64 " %08" PRIx64 "\n";
break;
case 8:
AddrFmt = "%08" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n";
break;
default:
llvm_unreachable("unsupported address size");
}
for (const RangeListEntry &RLE : Entries)
OS << format(AddrFmt, Offset, RLE.StartAddress, RLE.EndAddress);
OS << format("%08" PRIx64 " <End of list>\n", Offset);
}
DWARFAddressRangesVector DWARFDebugRangeList::getAbsoluteRanges(
std::optional<object::SectionedAddress> BaseAddr) const {
DWARFAddressRangesVector Res;
// debug_addr can't use the max integer tombstone because that's used for the
// base address specifier entry - so use max-1.
uint64_t Tombstone = dwarf::computeTombstoneAddress(AddressSize) - 1;
for (const RangeListEntry &RLE : Entries) {
if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
BaseAddr = {RLE.EndAddress, RLE.SectionIndex};
continue;
}
DWARFAddressRange E;
E.LowPC = RLE.StartAddress;
if (E.LowPC == Tombstone)
continue;
E.HighPC = RLE.EndAddress;
E.SectionIndex = RLE.SectionIndex;
// Base address of a range list entry is determined by the closest preceding
// base address selection entry in the same range list. It defaults to the
// base address of the compilation unit if there is no such entry.
if (BaseAddr) {
if (BaseAddr->Address == Tombstone)
continue;
E.LowPC += BaseAddr->Address;
E.HighPC += BaseAddr->Address;
if (E.SectionIndex == -1ULL)
E.SectionIndex = BaseAddr->SectionIndex;
}
Res.push_back(E);
}
return Res;
}
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