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   MyType *clone() const override {
  60     std::unique_ptr<ArgEnumeratorType> Clone(Enumerator->clone());
  61     return new FunctionArgEnumerator(Session, std::move(Clone));
  62   }
  63
  64 private:
  65   const IPDBSession &Session;
  66   std::unique_ptr<ArgEnumeratorType> Enumerator;
  67 };
  68 }
  69
  70 PDBSymbolTypeFunctionSig::PDBSymbolTypeFunctionSig(
  71     const IPDBSession &PDBSession, std::unique_ptr<IPDBRawSymbol> Symbol)
  72     : PDBSymbol(PDBSession, std::move(Symbol)) {
  73   assert(RawSymbol->getSymTag() == PDB_SymType::FunctionSig);
  74 }
  75
  76 std::unique_ptr<IPDBEnumSymbols>
  77 PDBSymbolTypeFunctionSig::getArguments() const {
  78   return llvm::make_unique<FunctionArgEnumerator>(Session, *this);
  79 }
  80
  81 void PDBSymbolTypeFunctionSig::dump(PDBSymDumper &Dumper) const {
  82   Dumper.dump(*this);
  83 }
  84
  85 void PDBSymbolTypeFunctionSig::dumpRight(PDBSymDumper &Dumper) const {
  86   Dumper.dumpRight(*this);
  87 }
  88
  89 bool PDBSymbolTypeFunctionSig::isCVarArgs() const {
  90   auto SigArguments = getArguments();
  91   if (!SigArguments)
  92     return false;
  93   uint32_t NumArgs = SigArguments->getChildCount();
  94   if (NumArgs == 0)
  95     return false;
  96   auto Last = SigArguments->getChildAtIndex(NumArgs - 1);
  97   if (auto Builtin = llvm::dyn_cast_or_null<PDBSymbolTypeBuiltin>(Last.get())) {
  98     if (Builtin->getBuiltinType() == PDB_BuiltinType::None)
  99       return true;
 100   }
 101
 102   // Note that for a variadic template signature, this method always returns
 103   // false since the parameters of the template are specialized.
 104   return false;
 105 }