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1 //===- DWARFDebugRangesList.cpp -------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
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10 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
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11 #include "llvm/Support/Errc.h"
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12 #include "llvm/Support/Format.h"
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13 #include "llvm/Support/raw_ostream.h"
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14 #include <cinttypes>
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15 #include <cstdint>
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16
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17 using namespace llvm;
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18
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19 void DWARFDebugRangeList::clear() {
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20 Offset = -1ULL;
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21 AddressSize = 0;
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22 Entries.clear();
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23 }
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24
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25 Error DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
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26 uint64_t *offset_ptr) {
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27 clear();
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28 if (!data.isValidOffset(*offset_ptr))
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29 return createStringError(errc::invalid_argument,
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30 "invalid range list offset 0x%" PRIx64, *offset_ptr);
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31
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32 AddressSize = data.getAddressSize();
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33 if (AddressSize != 4 && AddressSize != 8)
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34 return createStringError(errc::invalid_argument,
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35 "invalid address size: %" PRIu8, AddressSize);
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36 Offset = *offset_ptr;
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37 while (true) {
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38 RangeListEntry Entry;
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39 Entry.SectionIndex = -1ULL;
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40
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41 uint64_t prev_offset = *offset_ptr;
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42 Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
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43 Entry.EndAddress =
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44 data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);
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45
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46 // Check that both values were extracted correctly.
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47 if (*offset_ptr != prev_offset + 2 * AddressSize) {
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48 clear();
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49 return createStringError(errc::invalid_argument,
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50 "invalid range list entry at offset 0x%" PRIx64,
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51 prev_offset);
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52 }
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53 if (Entry.isEndOfListEntry())
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54 break;
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55 Entries.push_back(Entry);
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56 }
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57 return Error::success();
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58 }
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59
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60 void DWARFDebugRangeList::dump(raw_ostream &OS) const {
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61 for (const RangeListEntry &RLE : Entries) {
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62 const char *format_str =
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63 (AddressSize == 4 ? "%08" PRIx64 " %08" PRIx64 " %08" PRIx64 "\n"
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64 : "%08" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n");
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65 OS << format(format_str, Offset, RLE.StartAddress, RLE.EndAddress);
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66 }
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67 OS << format("%08" PRIx64 " <End of list>\n", Offset);
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68 }
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69
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70 DWARFAddressRangesVector DWARFDebugRangeList::getAbsoluteRanges(
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71 llvm::Optional<object::SectionedAddress> BaseAddr) const {
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72 DWARFAddressRangesVector Res;
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73 for (const RangeListEntry &RLE : Entries) {
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74 if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
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75 BaseAddr = {RLE.EndAddress, RLE.SectionIndex};
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76 continue;
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77 }
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78
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79 DWARFAddressRange E;
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80 E.LowPC = RLE.StartAddress;
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81 E.HighPC = RLE.EndAddress;
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82 E.SectionIndex = RLE.SectionIndex;
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83 // Base address of a range list entry is determined by the closest preceding
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84 // base address selection entry in the same range list. It defaults to the
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85 // base address of the compilation unit if there is no such entry.
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86 if (BaseAddr) {
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87 E.LowPC += BaseAddr->Address;
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88 E.HighPC += BaseAddr->Address;
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89 if (E.SectionIndex == -1ULL)
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90 E.SectionIndex = BaseAddr->SectionIndex;
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91 }
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92 Res.push_back(E);
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93 }
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94 return Res;
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95 }
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