1 files changed, 124 insertions, 0 deletions
diff --git a/llvm/lib/DebugInfo/PDB/PDBContext.cpp b/llvm/lib/DebugInfo/PDB/PDBContext.cpp
new file mode 100644
index 0000000000000..e452f1d4ced79
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/PDBContext.cpp
@@ -0,0 +1,124 @@
+//===-- PDBContext.cpp ------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===/
+
+#include "llvm/DebugInfo/PDB/PDBContext.h"
+#include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
+#include "llvm/DebugInfo/PDB/IPDBLineNumber.h"
+#include "llvm/DebugInfo/PDB/IPDBSourceFile.h"
+#include "llvm/DebugInfo/PDB/PDBSymbol.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
+#include "llvm/DebugInfo/PDB/PDBSymbolPublicSymbol.h"
+#include "llvm/Object/COFF.h"
+
+using namespace llvm;
+using namespace llvm::object;
+using namespace llvm::pdb;
+
+PDBContext::PDBContext(const COFFObjectFile &Object,
+                       std::unique_ptr<IPDBSession> PDBSession)
+    : DIContext(CK_PDB), Session(std::move(PDBSession)) {
+  ErrorOr<uint64_t> ImageBase = Object.getImageBase();
+  if (ImageBase)
+    Session->setLoadAddress(ImageBase.get());
+}
+
+void PDBContext::dump(raw_ostream &OS, DIDumpOptions DumpOpts){}
+
+DILineInfo PDBContext::getLineInfoForAddress(object::SectionedAddress Address,
+                                             DILineInfoSpecifier Specifier) {
+  DILineInfo Result;
+  Result.FunctionName = getFunctionName(Address.Address, Specifier.FNKind);
+
+  uint32_t Length = 1;
+  std::unique_ptr<PDBSymbol> Symbol =
+      Session->findSymbolByAddress(Address.Address, PDB_SymType::None);
+  if (auto Func = dyn_cast_or_null<PDBSymbolFunc>(Symbol.get())) {
+    Length = Func->getLength();
+  } else if (auto Data = dyn_cast_or_null<PDBSymbolData>(Symbol.get())) {
+    Length = Data->getLength();
+  }
+
+  // If we couldn't find a symbol, then just assume 1 byte, so that we get
+  // only the line number of the first instruction.
+  auto LineNumbers = Session->findLineNumbersByAddress(Address.Address, Length);
+  if (!LineNumbers || LineNumbers->getChildCount() == 0)
+    return Result;
+
+  auto LineInfo = LineNumbers->getNext();
+  assert(LineInfo);
+  auto SourceFile = Session->getSourceFileById(LineInfo->getSourceFileId());
+
+  if (SourceFile &&
+      Specifier.FLIKind != DILineInfoSpecifier::FileLineInfoKind::None)
+    Result.FileName = SourceFile->getFileName();
+  Result.Column = LineInfo->getColumnNumber();
+  Result.Line = LineInfo->getLineNumber();
+  return Result;
+}
+
+DILineInfoTable
+PDBContext::getLineInfoForAddressRange(object::SectionedAddress Address,
+                                       uint64_t Size,
+                                       DILineInfoSpecifier Specifier) {
+  if (Size == 0)
+    return DILineInfoTable();
+
+  DILineInfoTable Table;
+  auto LineNumbers = Session->findLineNumbersByAddress(Address.Address, Size);
+  if (!LineNumbers || LineNumbers->getChildCount() == 0)
+    return Table;
+
+  while (auto LineInfo = LineNumbers->getNext()) {
+    DILineInfo LineEntry = getLineInfoForAddress(
+        {LineInfo->getVirtualAddress(), Address.SectionIndex}, Specifier);
+    Table.push_back(std::make_pair(LineInfo->getVirtualAddress(), LineEntry));
+  }
+  return Table;
+}
+
+DIInliningInfo
+PDBContext::getInliningInfoForAddress(object::SectionedAddress Address,
+                                      DILineInfoSpecifier Specifier) {
+  DIInliningInfo InlineInfo;
+  DILineInfo Frame = getLineInfoForAddress(Address, Specifier);
+  InlineInfo.addFrame(Frame);
+  return InlineInfo;
+}
+
+std::vector<DILocal>
+PDBContext::getLocalsForAddress(object::SectionedAddress Address) {
+  return std::vector<DILocal>();
+}
+
+std::string PDBContext::getFunctionName(uint64_t Address,
+                                        DINameKind NameKind) const {
+  if (NameKind == DINameKind::None)
+    return std::string();
+
+  std::unique_ptr<PDBSymbol> FuncSymbol =
+      Session->findSymbolByAddress(Address, PDB_SymType::Function);
+  auto *Func = dyn_cast_or_null<PDBSymbolFunc>(FuncSymbol.get());
+
+  if (NameKind == DINameKind::LinkageName) {
+    // It is not possible to get the mangled linkage name through a
+    // PDBSymbolFunc.  For that we have to specifically request a
+    // PDBSymbolPublicSymbol.
+    auto PublicSym =
+        Session->findSymbolByAddress(Address, PDB_SymType::PublicSymbol);
+    if (auto *PS = dyn_cast_or_null<PDBSymbolPublicSymbol>(PublicSym.get())) {
+      // If we also have a function symbol, prefer the use of public symbol name
+      // only if it refers to the same address. The public symbol uses the
+      // linkage name while the function does not.
+      if (!Func || Func->getVirtualAddress() == PS->getVirtualAddress())
+        return PS->getName();
+    }
+  }
+
+  return Func ? Func->getName() : std::string();
+}