Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 616 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp b/gnu/llvm/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
new file mode 100644
index 00000000000..9efb021caa8
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
@@ -0,0 +1,616 @@
+//===-- ItaniumABILanguageRuntime.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 "ItaniumABILanguageRuntime.h"
+
+#include "lldb/Breakpoint/BreakpointLocation.h"
+#include "lldb/Core/Mangled.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Core/ValueObjectMemory.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Expression/DiagnosticManager.h"
+#include "lldb/Expression/FunctionCaller.h"
+#include "lldb/Interpreter/CommandObject.h"
+#include "lldb/Interpreter/CommandObjectMultiword.h"
+#include "lldb/Interpreter/CommandReturnObject.h"
+#include "lldb/Symbol/ClangASTContext.h"
+#include "lldb/Symbol/Symbol.h"
+#include "lldb/Symbol/SymbolFile.h"
+#include "lldb/Symbol/TypeList.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/RegisterContext.h"
+#include "lldb/Target/SectionLoadList.h"
+#include "lldb/Target/StopInfo.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Scalar.h"
+#include "lldb/Utility/Status.h"
+
+#include <vector>
+
+using namespace lldb;
+using namespace lldb_private;
+
+static const char *vtable_demangled_prefix = "vtable for ";
+
+char ItaniumABILanguageRuntime::ID = 0;
+
+bool ItaniumABILanguageRuntime::CouldHaveDynamicValue(ValueObject &in_value) {
+  const bool check_cxx = true;
+  const bool check_objc = false;
+  return in_value.GetCompilerType().IsPossibleDynamicType(nullptr, check_cxx,
+                                                          check_objc);
+}
+
+TypeAndOrName ItaniumABILanguageRuntime::GetTypeInfoFromVTableAddress(
+    ValueObject &in_value, lldb::addr_t original_ptr,
+    lldb::addr_t vtable_load_addr) {
+  if (m_process && vtable_load_addr != LLDB_INVALID_ADDRESS) {
+    // Find the symbol that contains the "vtable_load_addr" address
+    Address vtable_addr;
+    Target &target = m_process->GetTarget();
+    if (!target.GetSectionLoadList().IsEmpty()) {
+      if (target.GetSectionLoadList().ResolveLoadAddress(vtable_load_addr,
+                                                         vtable_addr)) {
+        // See if we have cached info for this type already
+        TypeAndOrName type_info = GetDynamicTypeInfo(vtable_addr);
+        if (type_info)
+          return type_info;
+
+        SymbolContext sc;
+        target.GetImages().ResolveSymbolContextForAddress(
+            vtable_addr, eSymbolContextSymbol, sc);
+        Symbol *symbol = sc.symbol;
+        if (symbol != nullptr) {
+          const char *name =
+              symbol->GetMangled()
+                  .GetDemangledName(lldb::eLanguageTypeC_plus_plus)
+                  .AsCString();
+          if (name && strstr(name, vtable_demangled_prefix) == name) {
+            Log *log(
+                lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
+            LLDB_LOGF(log,
+                      "0x%16.16" PRIx64
+                      ": static-type = '%s' has vtable symbol '%s'\n",
+                      original_ptr, in_value.GetTypeName().GetCString(), name);
+            // We are a C++ class, that's good.  Get the class name and look it
+            // up:
+            const char *class_name = name + strlen(vtable_demangled_prefix);
+            // We know the class name is absolute, so tell FindTypes that by
+            // prefixing it with the root namespace:
+            std::string lookup_name("::");
+            lookup_name.append(class_name);
+            
+            type_info.SetName(class_name);
+            const bool exact_match = true;
+            TypeList class_types;
+
+            // First look in the module that the vtable symbol came from and
+            // look for a single exact match.
+            llvm::DenseSet<SymbolFile *> searched_symbol_files;
+            if (sc.module_sp)
+              sc.module_sp->FindTypes(ConstString(lookup_name), exact_match, 1,
+                                      searched_symbol_files, class_types);
+
+            // If we didn't find a symbol, then move on to the entire module
+            // list in the target and get as many unique matches as possible
+            if (class_types.Empty())
+              target.GetImages().FindTypes(nullptr, ConstString(lookup_name),
+                                           exact_match, UINT32_MAX,
+                                           searched_symbol_files, class_types);
+
+            lldb::TypeSP type_sp;
+            if (class_types.Empty()) {
+              LLDB_LOGF(log, "0x%16.16" PRIx64 ": is not dynamic\n",
+                        original_ptr);
+              return TypeAndOrName();
+            }
+            if (class_types.GetSize() == 1) {
+              type_sp = class_types.GetTypeAtIndex(0);
+              if (type_sp) {
+                if (ClangASTContext::IsCXXClassType(
+                        type_sp->GetForwardCompilerType())) {
+                  LLDB_LOGF(
+                      log,
+                      "0x%16.16" PRIx64
+                      ": static-type = '%s' has dynamic type: uid={0x%" PRIx64
+                      "}, type-name='%s'\n",
+                      original_ptr, in_value.GetTypeName().AsCString(),
+                      type_sp->GetID(), type_sp->GetName().GetCString());
+                  type_info.SetTypeSP(type_sp);
+                }
+              }
+            } else {
+              size_t i;
+              if (log) {
+                for (i = 0; i < class_types.GetSize(); i++) {
+                  type_sp = class_types.GetTypeAtIndex(i);
+                  if (type_sp) {
+                    LLDB_LOGF(
+                        log,
+                        "0x%16.16" PRIx64
+                        ": static-type = '%s' has multiple matching dynamic "
+                        "types: uid={0x%" PRIx64 "}, type-name='%s'\n",
+                        original_ptr, in_value.GetTypeName().AsCString(),
+                        type_sp->GetID(), type_sp->GetName().GetCString());
+                  }
+                }
+              }
+
+              for (i = 0; i < class_types.GetSize(); i++) {
+                type_sp = class_types.GetTypeAtIndex(i);
+                if (type_sp) {
+                  if (ClangASTContext::IsCXXClassType(
+                          type_sp->GetForwardCompilerType())) {
+                    LLDB_LOGF(
+                        log,
+                        "0x%16.16" PRIx64 ": static-type = '%s' has multiple "
+                        "matching dynamic types, picking "
+                        "this one: uid={0x%" PRIx64 "}, type-name='%s'\n",
+                        original_ptr, in_value.GetTypeName().AsCString(),
+                        type_sp->GetID(), type_sp->GetName().GetCString());
+                    type_info.SetTypeSP(type_sp);
+                  }
+                }
+              }
+
+              if (log) {
+                LLDB_LOGF(log,
+                          "0x%16.16" PRIx64
+                          ": static-type = '%s' has multiple matching dynamic "
+                          "types, didn't find a C++ match\n",
+                          original_ptr, in_value.GetTypeName().AsCString());
+              }
+            }
+            if (type_info)
+              SetDynamicTypeInfo(vtable_addr, type_info);
+            return type_info;
+          }
+        }
+      }
+    }
+  }
+  return TypeAndOrName();
+}
+
+bool ItaniumABILanguageRuntime::GetDynamicTypeAndAddress(
+    ValueObject &in_value, lldb::DynamicValueType use_dynamic,
+    TypeAndOrName &class_type_or_name, Address &dynamic_address,
+    Value::ValueType &value_type) {
+  // For Itanium, if the type has a vtable pointer in the object, it will be at
+  // offset 0 in the object.  That will point to the "address point" within the
+  // vtable (not the beginning of the vtable.)  We can then look up the symbol
+  // containing this "address point" and that symbol's name demangled will
+  // contain the full class name. The second pointer above the "address point"
+  // is the "offset_to_top".  We'll use that to get the start of the value
+  // object which holds the dynamic type.
+  //
+
+  class_type_or_name.Clear();
+  value_type = Value::ValueType::eValueTypeScalar;
+
+  // Only a pointer or reference type can have a different dynamic and static
+  // type:
+  if (!CouldHaveDynamicValue(in_value))
+    return false;
+
+  // First job, pull out the address at 0 offset from the object.
+  AddressType address_type;
+  lldb::addr_t original_ptr = in_value.GetPointerValue(&address_type);
+  if (original_ptr == LLDB_INVALID_ADDRESS)
+    return false;
+
+  ExecutionContext exe_ctx(in_value.GetExecutionContextRef());
+
+  Process *process = exe_ctx.GetProcessPtr();
+
+  if (process == nullptr)
+    return false;
+
+  Status error;
+  const lldb::addr_t vtable_address_point =
+      process->ReadPointerFromMemory(original_ptr, error);
+
+  if (!error.Success() || vtable_address_point == LLDB_INVALID_ADDRESS)
+    return false;
+
+  class_type_or_name = GetTypeInfoFromVTableAddress(in_value, original_ptr,
+                                                    vtable_address_point);
+
+  if (!class_type_or_name)
+    return false;
+
+  CompilerType type = class_type_or_name.GetCompilerType();
+  // There can only be one type with a given name, so we've just found
+  // duplicate definitions, and this one will do as well as any other. We
+  // don't consider something to have a dynamic type if it is the same as
+  // the static type.  So compare against the value we were handed.
+  if (!type)
+    return true;
+
+  if (ClangASTContext::AreTypesSame(in_value.GetCompilerType(), type)) {
+    // The dynamic type we found was the same type, so we don't have a
+    // dynamic type here...
+    return false;
+  }
+
+  // The offset_to_top is two pointers above the vtable pointer.
+  const uint32_t addr_byte_size = process->GetAddressByteSize();
+  const lldb::addr_t offset_to_top_location =
+      vtable_address_point - 2 * addr_byte_size;
+  // Watch for underflow, offset_to_top_location should be less than
+  // vtable_address_point
+  if (offset_to_top_location >= vtable_address_point)
+    return false;
+  const int64_t offset_to_top = process->ReadSignedIntegerFromMemory(
+      offset_to_top_location, addr_byte_size, INT64_MIN, error);
+
+  if (offset_to_top == INT64_MIN)
+    return false;
+  // So the dynamic type is a value that starts at offset_to_top above
+  // the original address.
+  lldb::addr_t dynamic_addr = original_ptr + offset_to_top;
+  if (!process->GetTarget().GetSectionLoadList().ResolveLoadAddress(
+          dynamic_addr, dynamic_address)) {
+    dynamic_address.SetRawAddress(dynamic_addr);
+  }
+  return true;
+}
+
+TypeAndOrName ItaniumABILanguageRuntime::FixUpDynamicType(
+    const TypeAndOrName &type_and_or_name, ValueObject &static_value) {
+  CompilerType static_type(static_value.GetCompilerType());
+  Flags static_type_flags(static_type.GetTypeInfo());
+
+  TypeAndOrName ret(type_and_or_name);
+  if (type_and_or_name.HasType()) {
+    // The type will always be the type of the dynamic object.  If our parent's
+    // type was a pointer, then our type should be a pointer to the type of the
+    // dynamic object.  If a reference, then the original type should be
+    // okay...
+    CompilerType orig_type = type_and_or_name.GetCompilerType();
+    CompilerType corrected_type = orig_type;
+    if (static_type_flags.AllSet(eTypeIsPointer))
+      corrected_type = orig_type.GetPointerType();
+    else if (static_type_flags.AllSet(eTypeIsReference))
+      corrected_type = orig_type.GetLValueReferenceType();
+    ret.SetCompilerType(corrected_type);
+  } else {
+    // If we are here we need to adjust our dynamic type name to include the
+    // correct & or * symbol
+    std::string corrected_name(type_and_or_name.GetName().GetCString());
+    if (static_type_flags.AllSet(eTypeIsPointer))
+      corrected_name.append(" *");
+    else if (static_type_flags.AllSet(eTypeIsReference))
+      corrected_name.append(" &");
+    // the parent type should be a correctly pointer'ed or referenc'ed type
+    ret.SetCompilerType(static_type);
+    ret.SetName(corrected_name.c_str());
+  }
+  return ret;
+}
+
+// Static Functions
+LanguageRuntime *
+ItaniumABILanguageRuntime::CreateInstance(Process *process,
+                                          lldb::LanguageType language) {
+  // FIXME: We have to check the process and make sure we actually know that
+  // this process supports
+  // the Itanium ABI.
+  if (language == eLanguageTypeC_plus_plus ||
+      language == eLanguageTypeC_plus_plus_03 ||
+      language == eLanguageTypeC_plus_plus_11 ||
+      language == eLanguageTypeC_plus_plus_14)
+    return new ItaniumABILanguageRuntime(process);
+  else
+    return nullptr;
+}
+
+class CommandObjectMultiwordItaniumABI_Demangle : public CommandObjectParsed {
+public:
+  CommandObjectMultiwordItaniumABI_Demangle(CommandInterpreter &interpreter)
+      : CommandObjectParsed(interpreter, "demangle",
+                            "Demangle a C++ mangled name.",
+                            "language cplusplus demangle") {
+    CommandArgumentEntry arg;
+    CommandArgumentData index_arg;
+
+    // Define the first (and only) variant of this arg.
+    index_arg.arg_type = eArgTypeSymbol;
+    index_arg.arg_repetition = eArgRepeatPlus;
+
+    // There is only one variant this argument could be; put it into the
+    // argument entry.
+    arg.push_back(index_arg);
+
+    // Push the data for the first argument into the m_arguments vector.
+    m_arguments.push_back(arg);
+  }
+
+  ~CommandObjectMultiwordItaniumABI_Demangle() override = default;
+
+protected:
+  bool DoExecute(Args &command, CommandReturnObject &result) override {
+    bool demangled_any = false;
+    bool error_any = false;
+    for (auto &entry : command.entries()) {
+      if (entry.ref().empty())
+        continue;
+
+      // the actual Mangled class should be strict about this, but on the
+      // command line if you're copying mangled names out of 'nm' on Darwin,
+      // they will come out with an extra underscore - be willing to strip this
+      // on behalf of the user.   This is the moral equivalent of the -_/-n
+      // options to c++filt
+      auto name = entry.ref();
+      if (name.startswith("__Z"))
+        name = name.drop_front();
+
+      Mangled mangled(name);
+      if (mangled.GuessLanguage() == lldb::eLanguageTypeC_plus_plus) {
+        ConstString demangled(
+            mangled.GetDisplayDemangledName(lldb::eLanguageTypeC_plus_plus));
+        demangled_any = true;
+        result.AppendMessageWithFormat("%s ---> %s\n", entry.c_str(),
+                                       demangled.GetCString());
+      } else {
+        error_any = true;
+        result.AppendErrorWithFormat("%s is not a valid C++ mangled name\n",
+                                     entry.ref().str().c_str());
+      }
+    }
+
+    result.SetStatus(
+        error_any ? lldb::eReturnStatusFailed
+                  : (demangled_any ? lldb::eReturnStatusSuccessFinishResult
+                                   : lldb::eReturnStatusSuccessFinishNoResult));
+    return result.Succeeded();
+  }
+};
+
+class CommandObjectMultiwordItaniumABI : public CommandObjectMultiword {
+public:
+  CommandObjectMultiwordItaniumABI(CommandInterpreter &interpreter)
+      : CommandObjectMultiword(
+            interpreter, "cplusplus",
+            "Commands for operating on the C++ language runtime.",
+            "cplusplus <subcommand> [<subcommand-options>]") {
+    LoadSubCommand(
+        "demangle",
+        CommandObjectSP(
+            new CommandObjectMultiwordItaniumABI_Demangle(interpreter)));
+  }
+
+  ~CommandObjectMultiwordItaniumABI() override = default;
+};
+
+void ItaniumABILanguageRuntime::Initialize() {
+  PluginManager::RegisterPlugin(
+      GetPluginNameStatic(), "Itanium ABI for the C++ language", CreateInstance,
+      [](CommandInterpreter &interpreter) -> lldb::CommandObjectSP {
+        return CommandObjectSP(
+            new CommandObjectMultiwordItaniumABI(interpreter));
+      });
+}
+
+void ItaniumABILanguageRuntime::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+lldb_private::ConstString ItaniumABILanguageRuntime::GetPluginNameStatic() {
+  static ConstString g_name("itanium");
+  return g_name;
+}
+
+// PluginInterface protocol
+lldb_private::ConstString ItaniumABILanguageRuntime::GetPluginName() {
+  return GetPluginNameStatic();
+}
+
+uint32_t ItaniumABILanguageRuntime::GetPluginVersion() { return 1; }
+
+BreakpointResolverSP ItaniumABILanguageRuntime::CreateExceptionResolver(
+    Breakpoint *bkpt, bool catch_bp, bool throw_bp) {
+  return CreateExceptionResolver(bkpt, catch_bp, throw_bp, false);
+}
+
+BreakpointResolverSP ItaniumABILanguageRuntime::CreateExceptionResolver(
+    Breakpoint *bkpt, bool catch_bp, bool throw_bp, bool for_expressions) {
+  // One complication here is that most users DON'T want to stop at
+  // __cxa_allocate_expression, but until we can do anything better with
+  // predicting unwinding the expression parser does.  So we have two forms of
+  // the exception breakpoints, one for expressions that leaves out
+  // __cxa_allocate_exception, and one that includes it. The
+  // SetExceptionBreakpoints does the latter, the CreateExceptionBreakpoint in
+  // the runtime the former.
+  static const char *g_catch_name = "__cxa_begin_catch";
+  static const char *g_throw_name1 = "__cxa_throw";
+  static const char *g_throw_name2 = "__cxa_rethrow";
+  static const char *g_exception_throw_name = "__cxa_allocate_exception";
+  std::vector<const char *> exception_names;
+  exception_names.reserve(4);
+  if (catch_bp)
+    exception_names.push_back(g_catch_name);
+
+  if (throw_bp) {
+    exception_names.push_back(g_throw_name1);
+    exception_names.push_back(g_throw_name2);
+  }
+
+  if (for_expressions)
+    exception_names.push_back(g_exception_throw_name);
+
+  BreakpointResolverSP resolver_sp(new BreakpointResolverName(
+      bkpt, exception_names.data(), exception_names.size(),
+      eFunctionNameTypeBase, eLanguageTypeUnknown, 0, eLazyBoolNo));
+
+  return resolver_sp;
+}
+
+lldb::SearchFilterSP ItaniumABILanguageRuntime::CreateExceptionSearchFilter() {
+  Target &target = m_process->GetTarget();
+
+  FileSpecList filter_modules;
+  if (target.GetArchitecture().GetTriple().getVendor() == llvm::Triple::Apple) {
+    // Limit the number of modules that are searched for these breakpoints for
+    // Apple binaries.
+    filter_modules.EmplaceBack("libc++abi.dylib");
+    filter_modules.EmplaceBack("libSystem.B.dylib");
+  }
+  return target.GetSearchFilterForModuleList(&filter_modules);
+}
+
+lldb::BreakpointSP ItaniumABILanguageRuntime::CreateExceptionBreakpoint(
+    bool catch_bp, bool throw_bp, bool for_expressions, bool is_internal) {
+  Target &target = m_process->GetTarget();
+  FileSpecList filter_modules;
+  BreakpointResolverSP exception_resolver_sp =
+      CreateExceptionResolver(nullptr, catch_bp, throw_bp, for_expressions);
+  SearchFilterSP filter_sp(CreateExceptionSearchFilter());
+  const bool hardware = false;
+  const bool resolve_indirect_functions = false;
+  return target.CreateBreakpoint(filter_sp, exception_resolver_sp, is_internal,
+                                 hardware, resolve_indirect_functions);
+}
+
+void ItaniumABILanguageRuntime::SetExceptionBreakpoints() {
+  if (!m_process)
+    return;
+
+  const bool catch_bp = false;
+  const bool throw_bp = true;
+  const bool is_internal = true;
+  const bool for_expressions = true;
+
+  // For the exception breakpoints set by the Expression parser, we'll be a
+  // little more aggressive and stop at exception allocation as well.
+
+  if (m_cxx_exception_bp_sp) {
+    m_cxx_exception_bp_sp->SetEnabled(true);
+  } else {
+    m_cxx_exception_bp_sp = CreateExceptionBreakpoint(
+        catch_bp, throw_bp, for_expressions, is_internal);
+    if (m_cxx_exception_bp_sp)
+      m_cxx_exception_bp_sp->SetBreakpointKind("c++ exception");
+  }
+}
+
+void ItaniumABILanguageRuntime::ClearExceptionBreakpoints() {
+  if (!m_process)
+    return;
+
+  if (m_cxx_exception_bp_sp) {
+    m_cxx_exception_bp_sp->SetEnabled(false);
+  }
+}
+
+bool ItaniumABILanguageRuntime::ExceptionBreakpointsAreSet() {
+  return m_cxx_exception_bp_sp && m_cxx_exception_bp_sp->IsEnabled();
+}
+
+bool ItaniumABILanguageRuntime::ExceptionBreakpointsExplainStop(
+    lldb::StopInfoSP stop_reason) {
+  if (!m_process)
+    return false;
+
+  if (!stop_reason || stop_reason->GetStopReason() != eStopReasonBreakpoint)
+    return false;
+
+  uint64_t break_site_id = stop_reason->GetValue();
+  return m_process->GetBreakpointSiteList().BreakpointSiteContainsBreakpoint(
+      break_site_id, m_cxx_exception_bp_sp->GetID());
+}
+
+ValueObjectSP ItaniumABILanguageRuntime::GetExceptionObjectForThread(
+    ThreadSP thread_sp) {
+  if (!thread_sp->SafeToCallFunctions())
+    return {};
+
+  ClangASTContext *clang_ast_context =
+      ClangASTContext::GetScratch(m_process->GetTarget());
+  if (!clang_ast_context)
+    return {};
+
+  CompilerType voidstar =
+      clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
+
+  DiagnosticManager diagnostics;
+  ExecutionContext exe_ctx;
+  EvaluateExpressionOptions options;
+
+  options.SetUnwindOnError(true);
+  options.SetIgnoreBreakpoints(true);
+  options.SetStopOthers(true);
+  options.SetTimeout(m_process->GetUtilityExpressionTimeout());
+  options.SetTryAllThreads(false);
+  thread_sp->CalculateExecutionContext(exe_ctx);
+
+  const ModuleList &modules = m_process->GetTarget().GetImages();
+  SymbolContextList contexts;
+  SymbolContext context;
+
+  modules.FindSymbolsWithNameAndType(
+      ConstString("__cxa_current_exception_type"), eSymbolTypeCode, contexts);
+  contexts.GetContextAtIndex(0, context);
+  if (!context.symbol) {
+    return {};
+  }
+  Address addr = context.symbol->GetAddress();
+
+  Status error;
+  FunctionCaller *function_caller =
+      m_process->GetTarget().GetFunctionCallerForLanguage(
+          eLanguageTypeC, voidstar, addr, ValueList(), "caller", error);
+
+  ExpressionResults func_call_ret;
+  Value results;
+  func_call_ret = function_caller->ExecuteFunction(exe_ctx, nullptr, options,
+                                                   diagnostics, results);
+  if (func_call_ret != eExpressionCompleted || !error.Success()) {
+    return ValueObjectSP();
+  }
+
+  size_t ptr_size = m_process->GetAddressByteSize();
+  addr_t result_ptr = results.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
+  addr_t exception_addr =
+      m_process->ReadPointerFromMemory(result_ptr - ptr_size, error);
+
+  if (!error.Success()) {
+    return ValueObjectSP();
+  }
+
+  lldb_private::formatters::InferiorSizedWord exception_isw(exception_addr,
+                                                            *m_process);
+  ValueObjectSP exception = ValueObject::CreateValueObjectFromData(
+      "exception", exception_isw.GetAsData(m_process->GetByteOrder()), exe_ctx,
+      voidstar);
+  exception = exception->GetDynamicValue(eDynamicDontRunTarget);
+
+  return exception;
+}
+
+TypeAndOrName ItaniumABILanguageRuntime::GetDynamicTypeInfo(
+    const lldb_private::Address &vtable_addr) {
+  std::lock_guard<std::mutex> locker(m_dynamic_type_map_mutex);
+  DynamicTypeCache::const_iterator pos = m_dynamic_type_map.find(vtable_addr);
+  if (pos == m_dynamic_type_map.end())
+    return TypeAndOrName();
+  else
+    return pos->second;
+}
+
+void ItaniumABILanguageRuntime::SetDynamicTypeInfo(
+    const lldb_private::Address &vtable_addr, const TypeAndOrName &type_info) {
+  std::lock_guard<std::mutex> locker(m_dynamic_type_map_mutex);
+  m_dynamic_type_map[vtable_addr] = type_info;
+}