contrib/llvm/lib/DebugInfo/PDB/Native/NativeEnumGlobals.cpp

   1 //==- NativeEnumGlobals.cpp - Native Global Enumerator impl ------*- 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/PDB/Native/NativeEnumGlobals.h"
  11
  12 #include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
  13 #include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
  14 #include "llvm/DebugInfo/PDB/Native/GlobalsStream.h"
  15 #include "llvm/DebugInfo/PDB/Native/NativeSession.h"
  16 #include "llvm/DebugInfo/PDB/Native/PDBFile.h"
  17 #include "llvm/DebugInfo/PDB/Native/SymbolStream.h"
  18 #include "llvm/DebugInfo/PDB/PDBSymbol.h"
  19
  20 using namespace llvm;
  21 using namespace llvm::codeview;
  22 using namespace llvm::pdb;
  23
  24 NativeEnumGlobals::NativeEnumGlobals(NativeSession &PDBSession,
  25                                      std::vector<codeview::SymbolKind> Kinds)
  26     : Index(0), Session(PDBSession) {
  27   GlobalsStream &GS = cantFail(Session.getPDBFile().getPDBGlobalsStream());
  28   SymbolStream &SS = cantFail(Session.getPDBFile().getPDBSymbolStream());
  29   for (uint32_t Off : GS.getGlobalsTable()) {
  30     CVSymbol S = SS.readRecord(Off);
  31     if (!llvm::is_contained(Kinds, S.kind()))
  32       continue;
  33     MatchOffsets.push_back(Off);
  34   }
  35 }
  36
  37 uint32_t NativeEnumGlobals::getChildCount() const {
  38   return static_cast<uint32_t>(MatchOffsets.size());
  39 }
  40
  41 std::unique_ptr<PDBSymbol>
  42 NativeEnumGlobals::getChildAtIndex(uint32_t N) const {
  43   if (N >= MatchOffsets.size())
  44     return nullptr;
  45
  46   SymIndexId Id =
  47       Session.getSymbolCache().getOrCreateGlobalSymbolByOffset(MatchOffsets[N]);
  48   return Session.getSymbolCache().getSymbolById(Id);
  49 }
  50
  51 std::unique_ptr<PDBSymbol> NativeEnumGlobals::getNext() {
  52   return getChildAtIndex(Index++);
  53 }
  54
  55 void NativeEnumGlobals::reset() { Index = 0; }