contrib/llvm/include/llvm/DebugInfo/CodeView/SymbolDeserializer.h

   1 //===- SymbolDeserializer.h -------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef LLVM_DEBUGINFO_CODEVIEW_SYMBOLDESERIALIZER_H
  11 #define LLVM_DEBUGINFO_CODEVIEW_SYMBOLDESERIALIZER_H
  12
  13 #include "llvm/ADT/ArrayRef.h"
  14 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
  15 #include "llvm/DebugInfo/CodeView/SymbolRecordMapping.h"
  16 #include "llvm/DebugInfo/CodeView/SymbolVisitorCallbacks.h"
  17 #include "llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h"
  18 #include "llvm/DebugInfo/MSF/ByteStream.h"
  19 #include "llvm/DebugInfo/MSF/StreamReader.h"
  20 #include "llvm/Support/Error.h"
  21
  22 namespace llvm {
  23 namespace codeview {
  24 class SymbolVisitorDelegate;
  25 class SymbolDeserializer : public SymbolVisitorCallbacks {
  26   struct MappingInfo {
  27     explicit MappingInfo(ArrayRef<uint8_t> RecordData)
  28         : Stream(RecordData), Reader(Stream), Mapping(Reader) {}
  29
  30     msf::ByteStream Stream;
  31     msf::StreamReader Reader;
  32     SymbolRecordMapping Mapping;
  33   };
  34
  35 public:
  36   explicit SymbolDeserializer(SymbolVisitorDelegate *Delegate)
  37       : Delegate(Delegate) {}
  38
  39   Error visitSymbolBegin(CVSymbol &Record) override {
  40     assert(!Mapping && "Already in a symbol mapping!");
  41     Mapping = llvm::make_unique<MappingInfo>(Record.content());
  42     return Mapping->Mapping.visitSymbolBegin(Record);
  43   }
  44   Error visitSymbolEnd(CVSymbol &Record) override {
  45     assert(Mapping && "Not in a symbol mapping!");
  46     auto EC = Mapping->Mapping.visitSymbolEnd(Record);
  47     Mapping.reset();
  48     return EC;
  49   }
  50
  51 #define SYMBOL_RECORD(EnumName, EnumVal, Name)                                 \
  52   Error visitKnownRecord(CVSymbol &CVR, Name &Record) override {               \
  53     return visitKnownRecordImpl(CVR, Record);                                  \
  54   }
  55 #define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
  56 #include "CVSymbolTypes.def"
  57
  58 private:
  59   template <typename T> Error visitKnownRecordImpl(CVSymbol &CVR, T &Record) {
  60
  61     Record.RecordOffset =
  62         Delegate ? Delegate->getRecordOffset(Mapping->Reader) : 0;
  63     if (auto EC = Mapping->Mapping.visitKnownRecord(CVR, Record))
  64       return EC;
  65     return Error::success();
  66   }
  67
  68   SymbolVisitorDelegate *Delegate;
  69   std::unique_ptr<MappingInfo> Mapping;
  70 };
  71 }
  72 }
  73
  74 #endif