llvm/lib/DebugInfo/CodeView/SymbolSerializer.cpp

   1 //===- SymbolSerializer.cpp -----------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/DebugInfo/CodeView/SymbolSerializer.h"
  10 #include "llvm/ADT/ArrayRef.h"
  11 #include "llvm/Support/Error.h"
  12 #include <cassert>
  13 #include <cstdint>
  14 #include <cstring>
  15
  16 using namespace llvm;
  17 using namespace llvm::codeview;
  18
  19 SymbolSerializer::SymbolSerializer(BumpPtrAllocator &Allocator,
  20                                    CodeViewContainer Container)
  21     : Storage(Allocator), Stream(RecordBuffer, llvm::endianness::little),
  22       Writer(Stream), Mapping(Writer, Container) {}
  23
  24 Error SymbolSerializer::visitSymbolBegin(CVSymbol &Record) {
  25   assert(!CurrentSymbol && "Already in a symbol mapping!");
  26
  27   Writer.setOffset(0);
  28
  29   if (auto EC = writeRecordPrefix(Record.kind()))
  30     return EC;
  31
  32   CurrentSymbol = Record.kind();
  33   if (auto EC = Mapping.visitSymbolBegin(Record))
  34     return EC;
  35
  36   return Error::success();
  37 }
  38
  39 Error SymbolSerializer::visitSymbolEnd(CVSymbol &Record) {
  40   assert(CurrentSymbol && "Not in a symbol mapping!");
  41
  42   if (auto EC = Mapping.visitSymbolEnd(Record))
  43     return EC;
  44
  45   uint32_t RecordEnd = Writer.getOffset();
  46   uint16_t Length = RecordEnd - 2;
  47   Writer.setOffset(0);
  48   if (auto EC = Writer.writeInteger(Length))
  49     return EC;
  50
  51   uint8_t *StableStorage = Storage.Allocate<uint8_t>(RecordEnd);
  52   ::memcpy(StableStorage, &RecordBuffer[0], RecordEnd);
  53   Record.RecordData = ArrayRef<uint8_t>(StableStorage, RecordEnd);
  54   CurrentSymbol.reset();
  55
  56   return Error::success();
  57 }