lib/DebugInfo/PDB/PDBSymbolTypeFunctionSig.cpp

   1 //===- PDBSymbolTypeFunctionSig.cpp - --------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionSig.h"
  10
  11 #include "llvm/DebugInfo/PDB/ConcreteSymbolEnumerator.h"
  12 #include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
  13 #include "llvm/DebugInfo/PDB/IPDBSession.h"
  14 #include "llvm/DebugInfo/PDB/PDBSymDumper.h"
  15 #include "llvm/DebugInfo/PDB/PDBSymbol.h"
  16 #include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
  17 #include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionArg.h"
  18
  19 #include <utility>
  20
  21 using namespace llvm;
  22 using namespace llvm::pdb;
  23
  24 namespace {
  25 class FunctionArgEnumerator : public IPDBEnumSymbols {
  26 public:
  27   typedef ConcreteSymbolEnumerator<PDBSymbolTypeFunctionArg> ArgEnumeratorType;
  28
  29   FunctionArgEnumerator(const IPDBSession &PDBSession,
  30                         const PDBSymbolTypeFunctionSig &Sig)
  31       : Session(PDBSession),
  32         Enumerator(Sig.findAllChildren<PDBSymbolTypeFunctionArg>()) {}
  33
  34   FunctionArgEnumerator(const IPDBSession &PDBSession,
  35                         std::unique_ptr<ArgEnumeratorType> ArgEnumerator)
  36       : Session(PDBSession), Enumerator(std::move(ArgEnumerator)) {}
  37
  38   uint32_t getChildCount() const override {
  39     return Enumerator->getChildCount();
  40   }
  41
  42   std::unique_ptr<PDBSymbol> getChildAtIndex(uint32_t Index) const override {
  43     auto FunctionArgSymbol = Enumerator->getChildAtIndex(Index);
  44     if (!FunctionArgSymbol)
  45       return nullptr;
  46     return Session.getSymbolById(FunctionArgSymbol->getTypeId());
  47   }
  48
  49   std::unique_ptr<PDBSymbol> getNext() override {
  50     auto FunctionArgSymbol = Enumerator->getNext();
  51     if (!FunctionArgSymbol)
  52       return nullptr;
  53     return Session.getSymbolById(FunctionArgSymbol->getTypeId());
  54   }
  55
  56   void reset() override { Enumerator->reset(); }
  57
  58 private:
  59   const IPDBSession &Session;
  60   std::unique_ptr<ArgEnumeratorType> Enumerator;
  61 };
  62 }
  63
  64 std::unique_ptr<IPDBEnumSymbols>
  65 PDBSymbolTypeFunctionSig::getArguments() const {
  66   return std::make_unique<FunctionArgEnumerator>(Session, *this);
  67 }
  68
  69 void PDBSymbolTypeFunctionSig::dump(PDBSymDumper &Dumper) const {
  70   Dumper.dump(*this);
  71 }
  72
  73 void PDBSymbolTypeFunctionSig::dumpRight(PDBSymDumper &Dumper) const {
  74   Dumper.dumpRight(*this);
  75 }
  76
  77 bool PDBSymbolTypeFunctionSig::isCVarArgs() const {
  78   auto SigArguments = getArguments();
  79   if (!SigArguments)
  80     return false;
  81   uint32_t NumArgs = SigArguments->getChildCount();
  82   if (NumArgs == 0)
  83     return false;
  84   auto Last = SigArguments->getChildAtIndex(NumArgs - 1);
  85   if (auto Builtin = llvm::dyn_cast_or_null<PDBSymbolTypeBuiltin>(Last.get())) {
  86     if (Builtin->getBuiltinType() == PDB_BuiltinType::None)
  87       return true;
  88   }
  89
  90   // Note that for a variadic template signature, this method always returns
  91   // false since the parameters of the template are specialized.
  92   return false;
  93 }