llvm/lib/DebugInfo/PDB/PDBSymbolFunc.cpp

   1 //===- PDBSymbolFunc.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/PDBSymbolFunc.h"
  10
  11 #include "llvm/DebugInfo/PDB/ConcreteSymbolEnumerator.h"
  12 #include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
  13 #include "llvm/DebugInfo/PDB/IPDBLineNumber.h"
  14 #include "llvm/DebugInfo/PDB/IPDBSession.h"
  15 #include "llvm/DebugInfo/PDB/Native/NativeTypeFunctionSig.h"
  16 #include "llvm/DebugInfo/PDB/PDBSymDumper.h"
  17 #include "llvm/DebugInfo/PDB/PDBSymbolData.h"
  18 #include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionSig.h"
  19 #include "llvm/DebugInfo/PDB/PDBTypes.h"
  20
  21 #include <unordered_set>
  22 #include <utility>
  23 #include <vector>
  24
  25 using namespace llvm;
  26 using namespace llvm::pdb;
  27
  28 namespace {
  29 class FunctionArgEnumerator : public IPDBEnumChildren<PDBSymbolData> {
  30 public:
  31   typedef ConcreteSymbolEnumerator<PDBSymbolData> ArgEnumeratorType;
  32
  33   FunctionArgEnumerator(const IPDBSession &PDBSession,
  34                         const PDBSymbolFunc &PDBFunc)
  35       : Session(PDBSession), Func(PDBFunc) {
  36     // Arguments can appear multiple times if they have live range
  37     // information, so we only take the first occurrence.
  38     std::unordered_set<std::string> SeenNames;
  39     auto DataChildren = Func.findAllChildren<PDBSymbolData>();
  40     while (auto Child = DataChildren->getNext()) {
  41       if (Child->getDataKind() == PDB_DataKind::Param) {
  42         std::string Name = Child->getName();
  43         if (SeenNames.find(Name) != SeenNames.end())
  44           continue;
  45         Args.push_back(std::move(Child));
  46         SeenNames.insert(Name);
  47       }
  48     }
  49     reset();
  50   }
  51
  52   uint32_t getChildCount() const override { return Args.size(); }
  53
  54   std::unique_ptr<PDBSymbolData>
  55   getChildAtIndex(uint32_t Index) const override {
  56     if (Index >= Args.size())
  57       return nullptr;
  58
  59     return Session.getConcreteSymbolById<PDBSymbolData>(
  60         Args[Index]->getSymIndexId());
  61   }
  62
  63   std::unique_ptr<PDBSymbolData> getNext() override {
  64     if (CurIter == Args.end())
  65       return nullptr;
  66     const auto &Result = **CurIter;
  67     ++CurIter;
  68     return Session.getConcreteSymbolById<PDBSymbolData>(Result.getSymIndexId());
  69   }
  70
  71   void reset() override { CurIter = Args.empty() ? Args.end() : Args.begin(); }
  72
  73 private:
  74   typedef std::vector<std::unique_ptr<PDBSymbolData>> ArgListType;
  75   const IPDBSession &Session;
  76   const PDBSymbolFunc &Func;
  77   ArgListType Args;
  78   ArgListType::const_iterator CurIter;
  79 };
  80 }
  81
  82 std::unique_ptr<IPDBEnumChildren<PDBSymbolData>>
  83 PDBSymbolFunc::getArguments() const {
  84   return std::make_unique<FunctionArgEnumerator>(Session, *this);
  85 }
  86
  87 void PDBSymbolFunc::dump(PDBSymDumper &Dumper) const { Dumper.dump(*this); }
  88
  89 bool PDBSymbolFunc::isDestructor() const {
  90   std::string Name = getName();
  91   if (Name.empty())
  92     return false;
  93   if (Name[0] == '~')
  94     return true;
  95   if (Name == "__vecDelDtor")
  96     return true;
  97   return false;
  98 }
  99
 100 std::unique_ptr<IPDBEnumLineNumbers> PDBSymbolFunc::getLineNumbers() const {
 101   auto Len = RawSymbol->getLength();
 102   return Session.findLineNumbersByAddress(RawSymbol->getVirtualAddress(),
 103                                           Len ? Len : 1);
 104 }
 105
 106 uint32_t PDBSymbolFunc::getCompilandId() const {
 107   if (auto Lines = getLineNumbers()) {
 108     if (auto FirstLine = Lines->getNext()) {
 109       return FirstLine->getCompilandId();
 110     }
 111   }
 112   return 0;
 113 }