[NativeSession] Implement NativeSession::findSymbolByAddress.

Summary: This implements searching for function symbols and public symbols by address.

More specifically,
-Implements NativeSession::findSymbolByAddress for function symbols and
public symbols. I think data symbols are also searched for, but isn't
implemented in this patch.
-Adds classes for NativeFunctionSymbol and NativePublicSymbol
-Adds a '-use-native-pdb-reader' option to llvm-symbolizer, for testing
purposes.

Reviewers: rnk, amccarth, labath

Subscribers: mgorny, hiraditya, MaskRay, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D79269

1 files changed, 57 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/PDB/Native/NativeFunctionSymbol.cpp b/llvm/lib/DebugInfo/PDB/Native/NativeFunctionSymbol.cpp
new file mode 100644
index 0000000..2537daa
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/Native/NativeFunctionSymbol.cpp
@@ -0,0 +1,57 @@
+//===- NativeFunctionSymbol.cpp - info about function symbols----*- 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/Native/NativeFunctionSymbol.h"
+
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/DebugInfo/PDB/Native/NativeTypeBuiltin.h"
+#include "llvm/DebugInfo/PDB/Native/NativeTypeEnum.h"
+
+using namespace llvm;
+using namespace llvm::codeview;
+using namespace llvm::pdb;
+
+NativeFunctionSymbol::NativeFunctionSymbol(NativeSession &Session,
+                                           SymIndexId Id,
+                                           const codeview::ProcSym &Sym)
+    : NativeRawSymbol(Session, PDB_SymType::Data, Id), Sym(Sym) {}
+
+NativeFunctionSymbol::~NativeFunctionSymbol() {}
+
+void NativeFunctionSymbol::dump(raw_ostream &OS, int Indent,
+                                PdbSymbolIdField ShowIdFields,
+                                PdbSymbolIdField RecurseIdFields) const {
+  NativeRawSymbol::dump(OS, Indent, ShowIdFields, RecurseIdFields);
+  dumpSymbolField(OS, "name", getName(), Indent);
+  dumpSymbolField(OS, "length", getLength(), Indent);
+  dumpSymbolField(OS, "offset", getAddressOffset(), Indent);
+  dumpSymbolField(OS, "section", getAddressSection(), Indent);
+}
+
+uint32_t NativeFunctionSymbol::getAddressOffset() const {
+  return Sym.CodeOffset;
+}
+
+uint32_t NativeFunctionSymbol::getAddressSection() const { return Sym.Segment; }
+std::string NativeFunctionSymbol::getName() const {
+  return std::string(Sym.Name);
+}
+
+PDB_SymType NativeFunctionSymbol::getSymTag() const {
+  return PDB_SymType::Function;
+}
+
+uint64_t NativeFunctionSymbol::getLength() const { return Sym.CodeSize; }
+
+uint32_t NativeFunctionSymbol::getRelativeVirtualAddress() const {
+  return Session.getRVAFromSectOffset(Sym.Segment, Sym.CodeOffset);
+}
+
+uint64_t NativeFunctionSymbol::getVirtualAddress() const {
+  return Session.getVAFromSectOffset(Sym.Segment, Sym.CodeOffset);
+}