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//===- DWARFDebugRangesList.cpp -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cinttypes>
#include <cstdint>
#include <utility>
using namespace llvm;
void DWARFDebugRangeList::clear() {
Offset = -1U;
AddressSize = 0;
Entries.clear();
}
bool DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
uint32_t *offset_ptr) {
clear();
if (!data.isValidOffset(*offset_ptr))
return false;
AddressSize = data.getAddressSize();
if (AddressSize != 4 && AddressSize != 8)
return false;
Offset = *offset_ptr;
while (true) {
RangeListEntry Entry;
Entry.SectionIndex = -1ULL;
uint32_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 false;
}
if (Entry.isEndOfListEntry())
break;
Entries.push_back(Entry);
}
return true;
}
void DWARFDebugRangeList::dump(raw_ostream &OS) const {
for (const RangeListEntry &RLE : Entries) {
const char *format_str = (AddressSize == 4
? "%08x %08" PRIx64 " %08" PRIx64 "\n"
: "%08x %016" PRIx64 " %016" PRIx64 "\n");
OS << format(format_str, Offset, RLE.StartAddress, RLE.EndAddress);
}
OS << format("%08x <End of list>\n", Offset);
}
DWARFAddressRangesVector DWARFDebugRangeList::getAbsoluteRanges(
llvm::Optional<BaseAddress> BaseAddr) const {
DWARFAddressRangesVector Res;
for (const RangeListEntry &RLE : Entries) {
if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
BaseAddr = {RLE.EndAddress, RLE.SectionIndex};
continue;
}
DWARFAddressRange E;
E.LowPC = RLE.StartAddress;
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) {
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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