forked from OSchip/llvm-project
92 lines
2.8 KiB
C++
92 lines
2.8 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/DWARFDebugRangeList.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.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(const DWARFDataExtractor &data,
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uint32_t *offset_ptr) {
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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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Entry.SectionIndex = -1ULL;
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uint32_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 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 DWARFDebugRangeList::getAbsoluteRanges(
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llvm::Optional<BaseAddress> BaseAddr) 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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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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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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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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