contrib/llvm/lib/DebugInfo/PDB/PDBSymbolTypeFunctionSig.cpp

   1 //===- PDBSymbolTypeFunctionSig.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/PDB/PDBSymbolTypeFunctionSig.h"
  11
  12 #include "llvm/DebugInfo/PDB/ConcreteSymbolEnumerator.h"
  13 #include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
  14 #include "llvm/DebugInfo/PDB/IPDBSession.h"
  15 #include "llvm/DebugInfo/PDB/PDBSymDumper.h"
  16 #include "llvm/DebugInfo/PDB/PDBSymbol.h"
  17 #include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
  18 #include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionArg.h"
  19
  20 #include <utility>
  21
  22 using namespace llvm;
  23 using namespace llvm::pdb;
  24
  25 namespace {
  26 class FunctionArgEnumerator : public IPDBEnumSymbols {
  27 public:
  28   typedef ConcreteSymbolEnumerator<PDBSymbolTypeFunctionArg> ArgEnumeratorType;
  29
  30   FunctionArgEnumerator(const IPDBSession &PDBSession,
  31                         const PDBSymbolTypeFunctionSig &Sig)
  32       : Session(PDBSession),
  33         Enumerator(Sig.findAllChildren<PDBSymbolTypeFunctionArg>()) {}
  34
  35   FunctionArgEnumerator(const IPDBSession &PDBSession,
  36                         std::unique_ptr<ArgEnumeratorType> ArgEnumerator)
  37       : Session(PDBSession), Enumerator(std::move(ArgEnumerator)) {}
  38
  39   uint32_t getChildCount() const override {
  40     return Enumerator->getChildCount();
  41   }
  42
  43   std::unique_ptr<PDBSymbol> getChildAtIndex(uint32_t Index) const override {
  44     auto FunctionArgSymbol = Enumerator->getChildAtIndex(Index);
  45     if (!FunctionArgSymbol)
  46       return nullptr;
  47     return Session.getSymbolById(FunctionArgSymbol->getTypeId());
  48   }
  49
  50   std::unique_ptr<PDBSymbol> getNext() override {
  51     auto FunctionArgSymbol = Enumerator->getNext();
  52     if (!FunctionArgSymbol)
  53       return nullptr;
  54     return Session.getSymbolById(FunctionArgSymbol->getTypeId());
  55   }
  56
  57   void reset() override { Enumerator->reset(); }
  58
  59 private:
  60   const IPDBSession &Session;
  61   std::unique_ptr<ArgEnumeratorType> Enumerator;
  62 };
  63 }
  64
  65 std::unique_ptr<IPDBEnumSymbols>
  66 PDBSymbolTypeFunctionSig::getArguments() const {
  67   return llvm::make_unique<FunctionArgEnumerator>(Session, *this);
  68 }
  69
  70 void PDBSymbolTypeFunctionSig::dump(PDBSymDumper &Dumper) const {
  71   Dumper.dump(*this);
  72 }
  73
  74 void PDBSymbolTypeFunctionSig::dumpRight(PDBSymDumper &Dumper) const {
  75   Dumper.dumpRight(*this);
  76 }
  77
  78 bool PDBSymbolTypeFunctionSig::isCVarArgs() const {
  79   auto SigArguments = getArguments();
  80   if (!SigArguments)
  81     return false;
  82   uint32_t NumArgs = SigArguments->getChildCount();
  83   if (NumArgs == 0)
  84     return false;
  85   auto Last = SigArguments->getChildAtIndex(NumArgs - 1);
  86   if (auto Builtin = llvm::dyn_cast_or_null<PDBSymbolTypeBuiltin>(Last.get())) {
  87     if (Builtin->getBuiltinType() == PDB_BuiltinType::None)
  88       return true;
  89   }
  90
  91   // Note that for a variadic template signature, this method always returns
  92   // false since the parameters of the template are specialized.
  93   return false;
  94 }