lib/DebugInfo/CodeView/SimpleTypeSerializer.cpp

   1 #include "llvm/DebugInfo/CodeView/SimpleTypeSerializer.h"
   2
   3 using namespace llvm;
   4 using namespace llvm::codeview;
   5
   6 static void addPadding(BinaryStreamWriter &Writer) {
   7   uint32_t Align = Writer.getOffset() % 4;
   8   if (Align == 0)
   9     return;
  10
  11   int PaddingBytes = 4 - Align;
  12   while (PaddingBytes > 0) {
  13     uint8_t Pad = static_cast<uint8_t>(LF_PAD0 + PaddingBytes);
  14     cantFail(Writer.writeInteger(Pad));
  15     --PaddingBytes;
  16   }
  17 }
  18
  19 SimpleTypeSerializer::SimpleTypeSerializer() : ScratchBuffer(MaxRecordLength) {}
  20
  21 SimpleTypeSerializer::~SimpleTypeSerializer() {}
  22
  23 template <typename T>
  24 ArrayRef<uint8_t> SimpleTypeSerializer::serialize(T &Record) {
  25   BinaryStreamWriter Writer(ScratchBuffer, support::little);
  26   TypeRecordMapping Mapping(Writer);
  27
  28   // Write the record prefix first with a dummy length but real kind.
  29   RecordPrefix DummyPrefix(uint16_t(Record.getKind()));
  30   cantFail(Writer.writeObject(DummyPrefix));
  31
  32   RecordPrefix *Prefix = reinterpret_cast<RecordPrefix *>(ScratchBuffer.data());
  33   CVType CVT(Prefix, sizeof(RecordPrefix));
  34
  35   cantFail(Mapping.visitTypeBegin(CVT));
  36   cantFail(Mapping.visitKnownRecord(CVT, Record));
  37   cantFail(Mapping.visitTypeEnd(CVT));
  38
  39   addPadding(Writer);
  40
  41   // Update the size and kind after serialization.
  42   Prefix->RecordKind = CVT.kind();
  43   Prefix->RecordLen = Writer.getOffset() - sizeof(uint16_t);
  44
  45   return {ScratchBuffer.data(), Writer.getOffset()};
  46 }
  47
  48 // Explicitly instantiate the member function for each known type so that we can
  49 // implement this in the cpp file.
  50 #define TYPE_RECORD(EnumName, EnumVal, Name)                                   \
  51   template ArrayRef<uint8_t> llvm::codeview::SimpleTypeSerializer::serialize(  \
  52       Name##Record &Record);
  53 #define TYPE_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
  54 #define MEMBER_RECORD(EnumName, EnumVal, Name)
  55 #define MEMBER_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
  56 #include "llvm/DebugInfo/CodeView/CodeViewTypes.def"