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796506e01d
This change is intended to use for LLD in D33183. Problem we have in LLD when building .gdb_index is that we need to know section which address range belongs to. Previously it was solved on LLD side by providing fake section addresses with use of llvm::LoadedObjectInfo interface. We assigned file offsets as addressed. Then after obtaining ranges lists, for each range we had to find section ID's. That not only was slow, but also complicated implementation and was the reason of incorrect behavior when sections share the same offsets, like D33176 shows. This patch makes DWARF parsers to return section index as well. That solves problem mentioned above. Differential revision: https://reviews.llvm.org/D33184 llvm-svn: 304002
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
//===- DWARFDebugRangesList.cpp -------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.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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#include <utility>
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using namespace llvm;
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void DWARFDebugRangeList::clear() {
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Offset = -1U;
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AddressSize = 0;
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Entries.clear();
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}
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bool DWARFDebugRangeList::extract(DataExtractor data, uint32_t *offset_ptr,
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const RelocAddrMap &Relocs) {
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clear();
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if (!data.isValidOffset(*offset_ptr))
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return false;
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AddressSize = data.getAddressSize();
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if (AddressSize != 4 && AddressSize != 8)
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return false;
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Offset = *offset_ptr;
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while (true) {
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RangeListEntry entry;
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uint32_t prev_offset = *offset_ptr;
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entry.StartAddress = getRelocatedValue(data, AddressSize, offset_ptr,
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&Relocs, &entry.SectionIndex);
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entry.EndAddress =
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getRelocatedValue(data, AddressSize, offset_ptr, &Relocs);
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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 false;
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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 true;
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}
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void DWARFDebugRangeList::dump(raw_ostream &OS) const {
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for (const RangeListEntry &RLE : Entries) {
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const char *format_str = (AddressSize == 4
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? "%08x %08" PRIx64 " %08" PRIx64 "\n"
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: "%08x %016" PRIx64 " %016" PRIx64 "\n");
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OS << format(format_str, Offset, RLE.StartAddress, RLE.EndAddress);
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}
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OS << format("%08x <End of list>\n", Offset);
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}
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DWARFAddressRangesVector
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DWARFDebugRangeList::getAbsoluteRanges(uint64_t BaseAddress) const {
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DWARFAddressRangesVector Res;
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for (const RangeListEntry &RLE : Entries) {
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if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
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BaseAddress = RLE.EndAddress;
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} else {
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Res.push_back({BaseAddress + RLE.StartAddress,
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BaseAddress + RLE.EndAddress, RLE.SectionIndex});
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}
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}
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return Res;
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}
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