CompactUnwindSupport.cpp Source File (original) (raw)

23 size_t RecordSize) {

25 std::vector<Block *> OriginalBlocks(CompactUnwindSection.blocks().begin(),

26 CompactUnwindSection.blocks().end());

28 dbgs() << "In " << G.getName() << " splitting compact unwind section "

29 << CompactUnwindSection.getName() << " containing "

30 << OriginalBlocks.size() << " initial blocks...\n";

31 });

33 while (!OriginalBlocks.empty()) {

34 auto *B = OriginalBlocks.back();

35 OriginalBlocks.pop_back();

37 if (B->getSize() == 0) {

39 dbgs() << " Skipping empty block at "

40 << formatv("{0:x16}", B->getAddress()) << "\n";

41 });

42 continue;

43 }

45 unsigned NumBlocks = B->getSize() / RecordSize;

48 dbgs() << " Splitting block at " << formatv("{0:x16}", B->getAddress())

49 << " into " << NumBlocks << " compact unwind record(s)\n";

50 });

52 if (B->getSize() % RecordSize)

54 "Error splitting compact unwind record in " + G.getName() +

55 ": block at " + formatv("{0:x}", B->getAddress()) + " has size " +

56 formatv("{0:x}", B->getSize()) +

57 " (not a multiple of CU record size of " +

58 formatv("{0:x}", RecordSize) + ")");

60 auto Blocks =

61 G.splitBlock(*B, map_range(seq(1U, NumBlocks), [=](Edge::OffsetT Idx) {

62 return Idx * RecordSize;

63 }));

65 for (auto *CURec : Blocks) {

66 bool AddedKeepAlive = false;

68 for (auto &E : CURec->edges()) {

69 if (E.getOffset() == 0) {

71 dbgs() << " Updating compact unwind record at "

72 << CURec->getAddress() << " to point to "

73 << (E.getTarget().hasName() ? *E.getTarget().getName()

75 << " (at " << E.getTarget().getAddress() << ")\n";

76 });

78 if (E.getTarget().isExternal())

80 "Error adding keep-alive edge for compact unwind record at " +

81 formatv("{0:x}", CURec->getAddress()) + ": target " +

82 *E.getTarget().getName() + " is an external symbol");

83 auto &TgtBlock = E.getTarget().getBlock();

84 auto &CURecSym =

85 G.addAnonymousSymbol(*CURec, 0, RecordSize, false, false);

86 TgtBlock.addEdge(Edge::KeepAlive, 0, CURecSym, 0);

87 AddedKeepAlive = true;

88 }

89 }

91 if (!AddedKeepAlive)

93 "Error adding keep-alive edge for compact unwind record at " +

94 formatv("{0:x}", CURec->getAddress()) +

95 ": no outgoing target edge at offset 0");

96 }

97 }

100}