lib/DebugInfo/PDB/PDBContext.cpp

   1 //===-- PDBContext.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/PDBContext.h"
  10 #include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
  11 #include "llvm/DebugInfo/PDB/IPDBLineNumber.h"
  12 #include "llvm/DebugInfo/PDB/IPDBSourceFile.h"
  13 #include "llvm/DebugInfo/PDB/PDBSymbol.h"
  14 #include "llvm/DebugInfo/PDB/PDBSymbolData.h"
  15 #include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
  16 #include "llvm/DebugInfo/PDB/PDBSymbolPublicSymbol.h"
  17 #include "llvm/Object/COFF.h"
  18
  19 using namespace llvm;
  20 using namespace llvm::object;
  21 using namespace llvm::pdb;
  22
  23 PDBContext::PDBContext(const COFFObjectFile &Object,
  24                        std::unique_ptr<IPDBSession> PDBSession)
  25     : DIContext(CK_PDB), Session(std::move(PDBSession)) {
  26   ErrorOr<uint64_t> ImageBase = Object.getImageBase();
  27   if (ImageBase)
  28     Session->setLoadAddress(ImageBase.get());
  29 }
  30
  31 void PDBContext::dump(raw_ostream &OS, DIDumpOptions DumpOpts){}
  32
  33 DILineInfo PDBContext::getLineInfoForAddress(object::SectionedAddress Address,
  34                                              DILineInfoSpecifier Specifier) {
  35   DILineInfo Result;
  36   Result.FunctionName = getFunctionName(Address.Address, Specifier.FNKind);
  37
  38   uint32_t Length = 1;
  39   std::unique_ptr<PDBSymbol> Symbol =
  40       Session->findSymbolByAddress(Address.Address, PDB_SymType::None);
  41   if (auto Func = dyn_cast_or_null<PDBSymbolFunc>(Symbol.get())) {
  42     Length = Func->getLength();
  43   } else if (auto Data = dyn_cast_or_null<PDBSymbolData>(Symbol.get())) {
  44     Length = Data->getLength();
  45   }
  46
  47   // If we couldn't find a symbol, then just assume 1 byte, so that we get
  48   // only the line number of the first instruction.
  49   auto LineNumbers = Session->findLineNumbersByAddress(Address.Address, Length);
  50   if (!LineNumbers || LineNumbers->getChildCount() == 0)
  51     return Result;
  52
  53   auto LineInfo = LineNumbers->getNext();
  54   assert(LineInfo);
  55   auto SourceFile = Session->getSourceFileById(LineInfo->getSourceFileId());
  56
  57   if (SourceFile &&
  58       Specifier.FLIKind != DILineInfoSpecifier::FileLineInfoKind::None)
  59     Result.FileName = SourceFile->getFileName();
  60   Result.Column = LineInfo->getColumnNumber();
  61   Result.Line = LineInfo->getLineNumber();
  62   return Result;
  63 }
  64
  65 DILineInfoTable
  66 PDBContext::getLineInfoForAddressRange(object::SectionedAddress Address,
  67                                        uint64_t Size,
  68                                        DILineInfoSpecifier Specifier) {
  69   if (Size == 0)
  70     return DILineInfoTable();
  71
  72   DILineInfoTable Table;
  73   auto LineNumbers = Session->findLineNumbersByAddress(Address.Address, Size);
  74   if (!LineNumbers || LineNumbers->getChildCount() == 0)
  75     return Table;
  76
  77   while (auto LineInfo = LineNumbers->getNext()) {
  78     DILineInfo LineEntry = getLineInfoForAddress(
  79         {LineInfo->getVirtualAddress(), Address.SectionIndex}, Specifier);
  80     Table.push_back(std::make_pair(LineInfo->getVirtualAddress(), LineEntry));
  81   }
  82   return Table;
  83 }
  84
  85 DIInliningInfo
  86 PDBContext::getInliningInfoForAddress(object::SectionedAddress Address,
  87                                       DILineInfoSpecifier Specifier) {
  88   DIInliningInfo InlineInfo;
  89   DILineInfo Frame = getLineInfoForAddress(Address, Specifier);
  90   InlineInfo.addFrame(Frame);
  91   return InlineInfo;
  92 }
  93
  94 std::vector<DILocal>
  95 PDBContext::getLocalsForAddress(object::SectionedAddress Address) {
  96   return std::vector<DILocal>();
  97 }
  98
  99 std::string PDBContext::getFunctionName(uint64_t Address,
 100                                         DINameKind NameKind) const {
 101   if (NameKind == DINameKind::None)
 102     return std::string();
 103
 104   std::unique_ptr<PDBSymbol> FuncSymbol =
 105       Session->findSymbolByAddress(Address, PDB_SymType::Function);
 106   auto *Func = dyn_cast_or_null<PDBSymbolFunc>(FuncSymbol.get());
 107
 108   if (NameKind == DINameKind::LinkageName) {
 109     // It is not possible to get the mangled linkage name through a
 110     // PDBSymbolFunc.  For that we have to specifically request a
 111     // PDBSymbolPublicSymbol.
 112     auto PublicSym =
 113         Session->findSymbolByAddress(Address, PDB_SymType::PublicSymbol);
 114     if (auto *PS = dyn_cast_or_null<PDBSymbolPublicSymbol>(PublicSym.get())) {
 115       // If we also have a function symbol, prefer the use of public symbol name
 116       // only if it refers to the same address. The public symbol uses the
 117       // linkage name while the function does not.
 118       if (!Func || Func->getVirtualAddress() == PS->getVirtualAddress())
 119         return PS->getName();
 120     }
 121   }
 122
 123   return Func ? Func->getName() : std::string();
 124 }