lib/DebugInfo/CodeView/CVSymbolVisitor.cpp

   1 //===- CVSymbolVisitor.cpp --------------------------------------*- 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 #include "llvm/DebugInfo/CodeView/CVSymbolVisitor.h"
  11
  12 #include "llvm/DebugInfo/CodeView/CodeViewError.h"
  13 #include "llvm/DebugInfo/CodeView/SymbolVisitorCallbacks.h"
  14
  15 using namespace llvm;
  16 using namespace llvm::codeview;
  17
  18 CVSymbolVisitor::CVSymbolVisitor(SymbolVisitorCallbacks &Callbacks)
  19     : Callbacks(Callbacks) {}
  20
  21 template <typename T>
  22 static Error visitKnownRecord(CVSymbol &Record,
  23                               SymbolVisitorCallbacks &Callbacks) {
  24   SymbolRecordKind RK = static_cast<SymbolRecordKind>(Record.Type);
  25   T KnownRecord(RK);
  26   if (auto EC = Callbacks.visitKnownRecord(Record, KnownRecord))
  27     return EC;
  28   return Error::success();
  29 }
  30
  31 static Error finishVisitation(CVSymbol &Record,
  32                               SymbolVisitorCallbacks &Callbacks) {
  33   switch (Record.Type) {
  34   default:
  35     if (auto EC = Callbacks.visitUnknownSymbol(Record))
  36       return EC;
  37     break;
  38 #define SYMBOL_RECORD(EnumName, EnumVal, Name)                                 \
  39   case EnumName: {                                                             \
  40     if (auto EC = visitKnownRecord<Name>(Record, Callbacks))                   \
  41       return EC;                                                               \
  42     break;                                                                     \
  43   }
  44 #define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)                \
  45   SYMBOL_RECORD(EnumVal, EnumVal, AliasName)
  46 #include "llvm/DebugInfo/CodeView/CodeViewSymbols.def"
  47   }
  48
  49   if (auto EC = Callbacks.visitSymbolEnd(Record))
  50     return EC;
  51
  52   return Error::success();
  53 }
  54
  55 Error CVSymbolVisitor::visitSymbolRecord(CVSymbol &Record) {
  56   if (auto EC = Callbacks.visitSymbolBegin(Record))
  57     return EC;
  58   return finishVisitation(Record, Callbacks);
  59 }
  60
  61 Error CVSymbolVisitor::visitSymbolRecord(CVSymbol &Record, uint32_t Offset) {
  62   if (auto EC = Callbacks.visitSymbolBegin(Record, Offset))
  63     return EC;
  64   return finishVisitation(Record, Callbacks);
  65 }
  66
  67 Error CVSymbolVisitor::visitSymbolStream(const CVSymbolArray &Symbols) {
  68   for (auto I : Symbols) {
  69     if (auto EC = visitSymbolRecord(I))
  70       return EC;
  71   }
  72   return Error::success();
  73 }
  74
  75 Error CVSymbolVisitor::visitSymbolStream(const CVSymbolArray &Symbols,
  76                                          uint32_t InitialOffset) {
  77   for (auto I : Symbols) {
  78     if (auto EC = visitSymbolRecord(I, InitialOffset))
  79       return EC;
  80     InitialOffset += I.length();
  81   }
  82   return Error::success();
  83 }