120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
//===- DWARFDebugRangesList.cpp -------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cinttypes>
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#include <cstdint>
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using namespace llvm;
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bool DWARFDebugRangeList::RangeListEntry::isBaseAddressSelectionEntry(
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uint8_t AddressSize) const {
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assert(DWARFContext::isAddressSizeSupported(AddressSize));
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return StartAddress == dwarf::computeTombstoneAddress(AddressSize);
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}
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void DWARFDebugRangeList::clear() {
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Offset = -1ULL;
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AddressSize = 0;
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Entries.clear();
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}
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Error DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
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uint64_t *offset_ptr) {
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clear();
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if (!data.isValidOffset(*offset_ptr))
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return createStringError(errc::invalid_argument,
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"invalid range list offset 0x%" PRIx64, *offset_ptr);
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AddressSize = data.getAddressSize();
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if (Error SizeErr = DWARFContext::checkAddressSizeSupported(
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AddressSize, errc::invalid_argument,
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"range list at offset 0x%" PRIx64, *offset_ptr))
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return SizeErr;
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Offset = *offset_ptr;
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while (true) {
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RangeListEntry Entry;
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Entry.SectionIndex = -1ULL;
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uint64_t prev_offset = *offset_ptr;
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Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
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Entry.EndAddress =
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data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);
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// Check that both values were extracted correctly.
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if (*offset_ptr != prev_offset + 2 * AddressSize) {
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clear();
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return createStringError(errc::invalid_argument,
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"invalid range list entry at offset 0x%" PRIx64,
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prev_offset);
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}
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if (Entry.isEndOfListEntry())
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break;
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Entries.push_back(Entry);
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}
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return Error::success();
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}
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void DWARFDebugRangeList::dump(raw_ostream &OS) const {
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const char *AddrFmt;
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switch (AddressSize) {
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case 2:
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AddrFmt = "%08" PRIx64 " %04" PRIx64 " %04" PRIx64 "\n";
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break;
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case 4:
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AddrFmt = "%08" PRIx64 " %08" PRIx64 " %08" PRIx64 "\n";
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break;
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case 8:
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AddrFmt = "%08" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n";
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break;
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default:
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llvm_unreachable("unsupported address size");
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}
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for (const RangeListEntry &RLE : Entries)
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OS << format(AddrFmt, Offset, RLE.StartAddress, RLE.EndAddress);
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OS << format("%08" PRIx64 " <End of list>\n", Offset);
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}
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DWARFAddressRangesVector DWARFDebugRangeList::getAbsoluteRanges(
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llvm::Optional<object::SectionedAddress> BaseAddr) const {
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DWARFAddressRangesVector Res;
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// debug_addr can't use the max integer tombstone because that's used for the
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// base address specifier entry - so use max-1.
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uint64_t Tombstone = dwarf::computeTombstoneAddress(AddressSize) - 1;
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for (const RangeListEntry &RLE : Entries) {
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if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
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BaseAddr = {RLE.EndAddress, RLE.SectionIndex};
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continue;
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}
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DWARFAddressRange E;
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E.LowPC = RLE.StartAddress;
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if (E.LowPC == Tombstone)
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continue;
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E.HighPC = RLE.EndAddress;
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E.SectionIndex = RLE.SectionIndex;
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// Base address of a range list entry is determined by the closest preceding
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// base address selection entry in the same range list. It defaults to the
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// base address of the compilation unit if there is no such entry.
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if (BaseAddr) {
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if (BaseAddr->Address == Tombstone)
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continue;
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E.LowPC += BaseAddr->Address;
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E.HighPC += BaseAddr->Address;
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if (E.SectionIndex == -1ULL)
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E.SectionIndex = BaseAddr->SectionIndex;
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}
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Res.push_back(E);
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}
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return Res;
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}
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