--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lldb/source/Target/StackFrame.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,1971 @@
+//===-- StackFrame.cpp ----------------------------------------------------===//
+//
+// 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 "lldb/Target/StackFrame.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Disassembler.h"
+#include "lldb/Core/FormatEntity.h"
+#include "lldb/Core/Mangled.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/Value.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/Core/ValueObjectMemory.h"
+#include "lldb/Core/ValueObjectVariable.h"
+#include "lldb/Symbol/CompileUnit.h"
+#include "lldb/Symbol/Function.h"
+#include "lldb/Symbol/Symbol.h"
+#include "lldb/Symbol/SymbolContextScope.h"
+#include "lldb/Symbol/Type.h"
+#include "lldb/Symbol/VariableList.h"
+#include "lldb/Target/ABI.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/RegisterContext.h"
+#include "lldb/Target/StackFrameRecognizer.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/RegisterValue.h"
+
+#include "lldb/lldb-enumerations.h"
+
+#include <memory>
+
+using namespace lldb;
+using namespace lldb_private;
+
+// The first bits in the flags are reserved for the SymbolContext::Scope bits
+// so we know if we have tried to look up information in our internal symbol
+// context (m_sc) already.
+#define RESOLVED_FRAME_CODE_ADDR (uint32_t(eSymbolContextEverything + 1))
+#define RESOLVED_FRAME_ID_SYMBOL_SCOPE (RESOLVED_FRAME_CODE_ADDR << 1)
+#define GOT_FRAME_BASE (RESOLVED_FRAME_ID_SYMBOL_SCOPE << 1)
+#define RESOLVED_VARIABLES (GOT_FRAME_BASE << 1)
+#define RESOLVED_GLOBAL_VARIABLES (RESOLVED_VARIABLES << 1)
+
+StackFrame::StackFrame(const ThreadSP &thread_sp, user_id_t frame_idx,
+                       user_id_t unwind_frame_index, addr_t cfa,
+                       bool cfa_is_valid, addr_t pc, StackFrame::Kind kind,
+                       bool behaves_like_zeroth_frame,
+                       const SymbolContext *sc_ptr)
+    : m_thread_wp(thread_sp), m_frame_index(frame_idx),
+      m_concrete_frame_index(unwind_frame_index), m_reg_context_sp(),
+      m_id(pc, cfa, nullptr), m_frame_code_addr(pc), m_sc(), m_flags(),
+      m_frame_base(), m_frame_base_error(), m_cfa_is_valid(cfa_is_valid),
+      m_stack_frame_kind(kind),
+      m_behaves_like_zeroth_frame(behaves_like_zeroth_frame),
+      m_variable_list_sp(), m_variable_list_value_objects(),
+      m_recognized_frame_sp(), m_disassembly(), m_mutex() {
+  // If we don't have a CFA value, use the frame index for our StackID so that
+  // recursive functions properly aren't confused with one another on a history
+  // stack.
+  if (IsHistorical() && !m_cfa_is_valid) {
+    m_id.SetCFA(m_frame_index);
+  }
+
+  if (sc_ptr != nullptr) {
+    m_sc = *sc_ptr;
+    m_flags.Set(m_sc.GetResolvedMask());
+  }
+}
+
+StackFrame::StackFrame(const ThreadSP &thread_sp, user_id_t frame_idx,
+                       user_id_t unwind_frame_index,
+                       const RegisterContextSP &reg_context_sp, addr_t cfa,
+                       addr_t pc, bool behaves_like_zeroth_frame,
+                       const SymbolContext *sc_ptr)
+    : m_thread_wp(thread_sp), m_frame_index(frame_idx),
+      m_concrete_frame_index(unwind_frame_index),
+      m_reg_context_sp(reg_context_sp), m_id(pc, cfa, nullptr),
+      m_frame_code_addr(pc), m_sc(), m_flags(), m_frame_base(),
+      m_frame_base_error(), m_cfa_is_valid(true),
+      m_stack_frame_kind(StackFrame::Kind::Regular),
+      m_behaves_like_zeroth_frame(behaves_like_zeroth_frame),
+      m_variable_list_sp(), m_variable_list_value_objects(),
+      m_recognized_frame_sp(), m_disassembly(), m_mutex() {
+  if (sc_ptr != nullptr) {
+    m_sc = *sc_ptr;
+    m_flags.Set(m_sc.GetResolvedMask());
+  }
+
+  if (reg_context_sp && !m_sc.target_sp) {
+    m_sc.target_sp = reg_context_sp->CalculateTarget();
+    if (m_sc.target_sp)
+      m_flags.Set(eSymbolContextTarget);
+  }
+}
+
+StackFrame::StackFrame(const ThreadSP &thread_sp, user_id_t frame_idx,
+                       user_id_t unwind_frame_index,
+                       const RegisterContextSP &reg_context_sp, addr_t cfa,
+                       const Address &pc_addr, bool behaves_like_zeroth_frame,
+                       const SymbolContext *sc_ptr)
+    : m_thread_wp(thread_sp), m_frame_index(frame_idx),
+      m_concrete_frame_index(unwind_frame_index),
+      m_reg_context_sp(reg_context_sp),
+      m_id(pc_addr.GetLoadAddress(thread_sp->CalculateTarget().get()), cfa,
+           nullptr),
+      m_frame_code_addr(pc_addr), m_sc(), m_flags(), m_frame_base(),
+      m_frame_base_error(), m_cfa_is_valid(true),
+      m_stack_frame_kind(StackFrame::Kind::Regular),
+      m_behaves_like_zeroth_frame(behaves_like_zeroth_frame),
+      m_variable_list_sp(), m_variable_list_value_objects(),
+      m_recognized_frame_sp(), m_disassembly(), m_mutex() {
+  if (sc_ptr != nullptr) {
+    m_sc = *sc_ptr;
+    m_flags.Set(m_sc.GetResolvedMask());
+  }
+
+  if (!m_sc.target_sp && reg_context_sp) {
+    m_sc.target_sp = reg_context_sp->CalculateTarget();
+    if (m_sc.target_sp)
+      m_flags.Set(eSymbolContextTarget);
+  }
+
+  ModuleSP pc_module_sp(pc_addr.GetModule());
+  if (!m_sc.module_sp || m_sc.module_sp != pc_module_sp) {
+    if (pc_module_sp) {
+      m_sc.module_sp = pc_module_sp;
+      m_flags.Set(eSymbolContextModule);
+    } else {
+      m_sc.module_sp.reset();
+    }
+  }
+}
+
+StackFrame::~StackFrame() = default;
+
+StackID &StackFrame::GetStackID() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  // Make sure we have resolved the StackID object's symbol context scope if we
+  // already haven't looked it up.
+
+  if (m_flags.IsClear(RESOLVED_FRAME_ID_SYMBOL_SCOPE)) {
+    if (m_id.GetSymbolContextScope()) {
+      // We already have a symbol context scope, we just don't have our flag
+      // bit set.
+      m_flags.Set(RESOLVED_FRAME_ID_SYMBOL_SCOPE);
+    } else {
+      // Calculate the frame block and use this for the stack ID symbol context
+      // scope if we have one.
+      SymbolContextScope *scope = GetFrameBlock();
+      if (scope == nullptr) {
+        // We don't have a block, so use the symbol
+        if (m_flags.IsClear(eSymbolContextSymbol))
+          GetSymbolContext(eSymbolContextSymbol);
+
+        // It is ok if m_sc.symbol is nullptr here
+        scope = m_sc.symbol;
+      }
+      // Set the symbol context scope (the accessor will set the
+      // RESOLVED_FRAME_ID_SYMBOL_SCOPE bit in m_flags).
+      SetSymbolContextScope(scope);
+    }
+  }
+  return m_id;
+}
+
+uint32_t StackFrame::GetFrameIndex() const {
+  ThreadSP thread_sp = GetThread();
+  if (thread_sp)
+    return thread_sp->GetStackFrameList()->GetVisibleStackFrameIndex(
+        m_frame_index);
+  else
+    return m_frame_index;
+}
+
+void StackFrame::SetSymbolContextScope(SymbolContextScope *symbol_scope) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  m_flags.Set(RESOLVED_FRAME_ID_SYMBOL_SCOPE);
+  m_id.SetSymbolContextScope(symbol_scope);
+}
+
+const Address &StackFrame::GetFrameCodeAddress() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  if (m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR) &&
+      !m_frame_code_addr.IsSectionOffset()) {
+    m_flags.Set(RESOLVED_FRAME_CODE_ADDR);
+
+    // Resolve the PC into a temporary address because if ResolveLoadAddress
+    // fails to resolve the address, it will clear the address object...
+    ThreadSP thread_sp(GetThread());
+    if (thread_sp) {
+      TargetSP target_sp(thread_sp->CalculateTarget());
+      if (target_sp) {
+        const bool allow_section_end = true;
+        if (m_frame_code_addr.SetOpcodeLoadAddress(
+                m_frame_code_addr.GetOffset(), target_sp.get(),
+                AddressClass::eCode, allow_section_end)) {
+          ModuleSP module_sp(m_frame_code_addr.GetModule());
+          if (module_sp) {
+            m_sc.module_sp = module_sp;
+            m_flags.Set(eSymbolContextModule);
+          }
+        }
+      }
+    }
+  }
+  return m_frame_code_addr;
+}
+
+bool StackFrame::ChangePC(addr_t pc) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  // We can't change the pc value of a history stack frame - it is immutable.
+  if (IsHistorical())
+    return false;
+  m_frame_code_addr.SetRawAddress(pc);
+  m_sc.Clear(false);
+  m_flags.Reset(0);
+  ThreadSP thread_sp(GetThread());
+  if (thread_sp)
+    thread_sp->ClearStackFrames();
+  return true;
+}
+
+const char *StackFrame::Disassemble() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  if (m_disassembly.Empty()) {
+    ExecutionContext exe_ctx(shared_from_this());
+    Target *target = exe_ctx.GetTargetPtr();
+    if (target) {
+      const char *plugin_name = nullptr;
+      const char *flavor = nullptr;
+      Disassembler::Disassemble(target->GetDebugger(),
+                                target->GetArchitecture(), plugin_name, flavor,
+                                exe_ctx, 0, false, 0, 0, m_disassembly);
+    }
+    if (m_disassembly.Empty())
+      return nullptr;
+  }
+
+  return m_disassembly.GetData();
+}
+
+Block *StackFrame::GetFrameBlock() {
+  if (m_sc.block == nullptr && m_flags.IsClear(eSymbolContextBlock))
+    GetSymbolContext(eSymbolContextBlock);
+
+  if (m_sc.block) {
+    Block *inline_block = m_sc.block->GetContainingInlinedBlock();
+    if (inline_block) {
+      // Use the block with the inlined function info as the frame block we
+      // want this frame to have only the variables for the inlined function
+      // and its non-inlined block child blocks.
+      return inline_block;
+    } else {
+      // This block is not contained within any inlined function blocks with so
+      // we want to use the top most function block.
+      return &m_sc.function->GetBlock(false);
+    }
+  }
+  return nullptr;
+}
+
+// Get the symbol context if we already haven't done so by resolving the
+// PC address as much as possible. This way when we pass around a
+// StackFrame object, everyone will have as much information as possible and no
+// one will ever have to look things up manually.
+const SymbolContext &
+StackFrame::GetSymbolContext(SymbolContextItem resolve_scope) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  // Copy our internal symbol context into "sc".
+  if ((m_flags.Get() & resolve_scope) != resolve_scope) {
+    uint32_t resolved = 0;
+
+    // If the target was requested add that:
+    if (!m_sc.target_sp) {
+      m_sc.target_sp = CalculateTarget();
+      if (m_sc.target_sp)
+        resolved |= eSymbolContextTarget;
+    }
+
+    // Resolve our PC to section offset if we haven't already done so and if we
+    // don't have a module. The resolved address section will contain the
+    // module to which it belongs
+    if (!m_sc.module_sp && m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR))
+      GetFrameCodeAddress();
+
+    // If this is not frame zero, then we need to subtract 1 from the PC value
+    // when doing address lookups since the PC will be on the instruction
+    // following the function call instruction...
+
+    Address lookup_addr(GetFrameCodeAddress());
+    if (!m_behaves_like_zeroth_frame && lookup_addr.IsValid()) {
+      addr_t offset = lookup_addr.GetOffset();
+      if (offset > 0) {
+        lookup_addr.SetOffset(offset - 1);
+
+      } else {
+        // lookup_addr is the start of a section.  We need do the math on the
+        // actual load address and re-compute the section.  We're working with
+        // a 'noreturn' function at the end of a section.
+        ThreadSP thread_sp(GetThread());
+        if (thread_sp) {
+          TargetSP target_sp(thread_sp->CalculateTarget());
+          if (target_sp) {
+            addr_t addr_minus_one =
+                lookup_addr.GetLoadAddress(target_sp.get()) - 1;
+            lookup_addr.SetLoadAddress(addr_minus_one, target_sp.get());
+          } else {
+            lookup_addr.SetOffset(offset - 1);
+          }
+        }
+      }
+    }
+
+    if (m_sc.module_sp) {
+      // We have something in our stack frame symbol context, lets check if we
+      // haven't already tried to lookup one of those things. If we haven't
+      // then we will do the query.
+
+      SymbolContextItem actual_resolve_scope = SymbolContextItem(0);
+
+      if (resolve_scope & eSymbolContextCompUnit) {
+        if (m_flags.IsClear(eSymbolContextCompUnit)) {
+          if (m_sc.comp_unit)
+            resolved |= eSymbolContextCompUnit;
+          else
+            actual_resolve_scope |= eSymbolContextCompUnit;
+        }
+      }
+
+      if (resolve_scope & eSymbolContextFunction) {
+        if (m_flags.IsClear(eSymbolContextFunction)) {
+          if (m_sc.function)
+            resolved |= eSymbolContextFunction;
+          else
+            actual_resolve_scope |= eSymbolContextFunction;
+        }
+      }
+
+      if (resolve_scope & eSymbolContextBlock) {
+        if (m_flags.IsClear(eSymbolContextBlock)) {
+          if (m_sc.block)
+            resolved |= eSymbolContextBlock;
+          else
+            actual_resolve_scope |= eSymbolContextBlock;
+        }
+      }
+
+      if (resolve_scope & eSymbolContextSymbol) {
+        if (m_flags.IsClear(eSymbolContextSymbol)) {
+          if (m_sc.symbol)
+            resolved |= eSymbolContextSymbol;
+          else
+            actual_resolve_scope |= eSymbolContextSymbol;
+        }
+      }
+
+      if (resolve_scope & eSymbolContextLineEntry) {
+        if (m_flags.IsClear(eSymbolContextLineEntry)) {
+          if (m_sc.line_entry.IsValid())
+            resolved |= eSymbolContextLineEntry;
+          else
+            actual_resolve_scope |= eSymbolContextLineEntry;
+        }
+      }
+
+      if (actual_resolve_scope) {
+        // We might be resolving less information than what is already in our
+        // current symbol context so resolve into a temporary symbol context
+        // "sc" so we don't clear out data we have already found in "m_sc"
+        SymbolContext sc;
+        // Set flags that indicate what we have tried to resolve
+        resolved |= m_sc.module_sp->ResolveSymbolContextForAddress(
+            lookup_addr, actual_resolve_scope, sc);
+        // Only replace what we didn't already have as we may have information
+        // for an inlined function scope that won't match what a standard
+        // lookup by address would match
+        if ((resolved & eSymbolContextCompUnit) && m_sc.comp_unit == nullptr)
+          m_sc.comp_unit = sc.comp_unit;
+        if ((resolved & eSymbolContextFunction) && m_sc.function == nullptr)
+          m_sc.function = sc.function;
+        if ((resolved & eSymbolContextBlock) && m_sc.block == nullptr)
+          m_sc.block = sc.block;
+        if ((resolved & eSymbolContextSymbol) && m_sc.symbol == nullptr)
+          m_sc.symbol = sc.symbol;
+        if ((resolved & eSymbolContextLineEntry) &&
+            !m_sc.line_entry.IsValid()) {
+          m_sc.line_entry = sc.line_entry;
+          m_sc.line_entry.ApplyFileMappings(m_sc.target_sp);
+        }
+      }
+    } else {
+      // If we don't have a module, then we can't have the compile unit,
+      // function, block, line entry or symbol, so we can safely call
+      // ResolveSymbolContextForAddress with our symbol context member m_sc.
+      if (m_sc.target_sp) {
+        resolved |= m_sc.target_sp->GetImages().ResolveSymbolContextForAddress(
+            lookup_addr, resolve_scope, m_sc);
+      }
+    }
+
+    // Update our internal flags so we remember what we have tried to locate so
+    // we don't have to keep trying when more calls to this function are made.
+    // We might have dug up more information that was requested (for example if
+    // we were asked to only get the block, we will have gotten the compile
+    // unit, and function) so set any additional bits that we resolved
+    m_flags.Set(resolve_scope | resolved);
+  }
+
+  // Return the symbol context with everything that was possible to resolve
+  // resolved.
+  return m_sc;
+}
+
+VariableList *StackFrame::GetVariableList(bool get_file_globals) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  if (m_flags.IsClear(RESOLVED_VARIABLES)) {
+    m_flags.Set(RESOLVED_VARIABLES);
+
+    Block *frame_block = GetFrameBlock();
+
+    if (frame_block) {
+      const bool get_child_variables = true;
+      const bool can_create = true;
+      const bool stop_if_child_block_is_inlined_function = true;
+      m_variable_list_sp = std::make_shared<VariableList>();
+      frame_block->AppendBlockVariables(can_create, get_child_variables,
+                                        stop_if_child_block_is_inlined_function,
+                                        [](Variable *v) { return true; },
+                                        m_variable_list_sp.get());
+    }
+  }
+
+  if (m_flags.IsClear(RESOLVED_GLOBAL_VARIABLES) && get_file_globals) {
+    m_flags.Set(RESOLVED_GLOBAL_VARIABLES);
+
+    if (m_flags.IsClear(eSymbolContextCompUnit))
+      GetSymbolContext(eSymbolContextCompUnit);
+
+    if (m_sc.comp_unit) {
+      VariableListSP global_variable_list_sp(
+          m_sc.comp_unit->GetVariableList(true));
+      if (m_variable_list_sp)
+        m_variable_list_sp->AddVariables(global_variable_list_sp.get());
+      else
+        m_variable_list_sp = global_variable_list_sp;
+    }
+  }
+
+  return m_variable_list_sp.get();
+}
+
+VariableListSP
+StackFrame::GetInScopeVariableList(bool get_file_globals,
+                                   bool must_have_valid_location) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  // We can't fetch variable information for a history stack frame.
+  if (IsHistorical())
+    return VariableListSP();
+
+  VariableListSP var_list_sp(new VariableList);
+  GetSymbolContext(eSymbolContextCompUnit | eSymbolContextBlock);
+
+  if (m_sc.block) {
+    const bool can_create = true;
+    const bool get_parent_variables = true;
+    const bool stop_if_block_is_inlined_function = true;
+    m_sc.block->AppendVariables(
+        can_create, get_parent_variables, stop_if_block_is_inlined_function,
+        [this, must_have_valid_location](Variable *v) {
+          return v->IsInScope(this) && (!must_have_valid_location ||
+                                        v->LocationIsValidForFrame(this));
+        },
+        var_list_sp.get());
+  }
+
+  if (m_sc.comp_unit && get_file_globals) {
+    VariableListSP global_variable_list_sp(
+        m_sc.comp_unit->GetVariableList(true));
+    if (global_variable_list_sp)
+      var_list_sp->AddVariables(global_variable_list_sp.get());
+  }
+
+  return var_list_sp;
+}
+
+ValueObjectSP StackFrame::GetValueForVariableExpressionPath(
+    llvm::StringRef var_expr, DynamicValueType use_dynamic, uint32_t options,
+    VariableSP &var_sp, Status &error) {
+  llvm::StringRef original_var_expr = var_expr;
+  // We can't fetch variable information for a history stack frame.
+  if (IsHistorical())
+    return ValueObjectSP();
+
+  if (var_expr.empty()) {
+    error.SetErrorStringWithFormat("invalid variable path '%s'",
+                                   var_expr.str().c_str());
+    return ValueObjectSP();
+  }
+
+  const bool check_ptr_vs_member =
+      (options & eExpressionPathOptionCheckPtrVsMember) != 0;
+  const bool no_fragile_ivar =
+      (options & eExpressionPathOptionsNoFragileObjcIvar) != 0;
+  const bool no_synth_child =
+      (options & eExpressionPathOptionsNoSyntheticChildren) != 0;
+  // const bool no_synth_array = (options &
+  // eExpressionPathOptionsNoSyntheticArrayRange) != 0;
+  error.Clear();
+  bool deref = false;
+  bool address_of = false;
+  ValueObjectSP valobj_sp;
+  const bool get_file_globals = true;
+  // When looking up a variable for an expression, we need only consider the
+  // variables that are in scope.
+  VariableListSP var_list_sp(GetInScopeVariableList(get_file_globals));
+  VariableList *variable_list = var_list_sp.get();
+
+  if (!variable_list)
+    return ValueObjectSP();
+
+  // If first character is a '*', then show pointer contents
+  std::string var_expr_storage;
+  if (var_expr[0] == '*') {
+    deref = true;
+    var_expr = var_expr.drop_front(); // Skip the '*'
+  } else if (var_expr[0] == '&') {
+    address_of = true;
+    var_expr = var_expr.drop_front(); // Skip the '&'
+  }
+
+  size_t separator_idx = var_expr.find_first_of(".-[=+~|&^%#@!/?,<>{}");
+  StreamString var_expr_path_strm;
+
+  ConstString name_const_string(var_expr.substr(0, separator_idx));
+
+  var_sp = variable_list->FindVariable(name_const_string, false);
+
+  bool synthetically_added_instance_object = false;
+
+  if (var_sp) {
+    var_expr = var_expr.drop_front(name_const_string.GetLength());
+  }
+
+  if (!var_sp && (options & eExpressionPathOptionsAllowDirectIVarAccess)) {
+    // Check for direct ivars access which helps us with implicit access to
+    // ivars with the "this->" or "self->"
+    GetSymbolContext(eSymbolContextFunction | eSymbolContextBlock);
+    lldb::LanguageType method_language = eLanguageTypeUnknown;
+    bool is_instance_method = false;
+    ConstString method_object_name;
+    if (m_sc.GetFunctionMethodInfo(method_language, is_instance_method,
+                                   method_object_name)) {
+      if (is_instance_method && method_object_name) {
+        var_sp = variable_list->FindVariable(method_object_name);
+        if (var_sp) {
+          separator_idx = 0;
+          var_expr_storage = "->";
+          var_expr_storage += var_expr;
+          var_expr = var_expr_storage;
+          synthetically_added_instance_object = true;
+        }
+      }
+    }
+  }
+
+  if (!var_sp && (options & eExpressionPathOptionsInspectAnonymousUnions)) {
+    // Check if any anonymous unions are there which contain a variable with
+    // the name we need
+    for (const VariableSP &variable_sp : *variable_list) {
+      if (!variable_sp)
+        continue;
+      if (!variable_sp->GetName().IsEmpty())
+        continue;
+
+      Type *var_type = variable_sp->GetType();
+      if (!var_type)
+        continue;
+
+      if (!var_type->GetForwardCompilerType().IsAnonymousType())
+        continue;
+      valobj_sp = GetValueObjectForFrameVariable(variable_sp, use_dynamic);
+      if (!valobj_sp)
+        return valobj_sp;
+      valobj_sp = valobj_sp->GetChildMemberWithName(name_const_string, true);
+      if (valobj_sp)
+        break;
+    }
+  }
+
+  if (var_sp && !valobj_sp) {
+    valobj_sp = GetValueObjectForFrameVariable(var_sp, use_dynamic);
+    if (!valobj_sp)
+      return valobj_sp;
+  }
+  if (!valobj_sp) {
+    error.SetErrorStringWithFormat("no variable named '%s' found in this frame",
+                                   name_const_string.GetCString());
+    return ValueObjectSP();
+  }
+
+  // We are dumping at least one child
+  while (separator_idx != std::string::npos) {
+    // Calculate the next separator index ahead of time
+    ValueObjectSP child_valobj_sp;
+    const char separator_type = var_expr[0];
+    bool expr_is_ptr = false;
+    switch (separator_type) {
+    case '-':
+      expr_is_ptr = true;
+      if (var_expr.size() >= 2 && var_expr[1] != '>')
+        return ValueObjectSP();
+
+      if (no_fragile_ivar) {
+        // Make sure we aren't trying to deref an objective
+        // C ivar if this is not allowed
+        const uint32_t pointer_type_flags =
+            valobj_sp->GetCompilerType().GetTypeInfo(nullptr);
+        if ((pointer_type_flags & eTypeIsObjC) &&
+            (pointer_type_flags & eTypeIsPointer)) {
+          // This was an objective C object pointer and it was requested we
+          // skip any fragile ivars so return nothing here
+          return ValueObjectSP();
+        }
+      }
+
+      // If we have a non pointer type with a sythetic value then lets check if
+      // we have an sythetic dereference specified.
+      if (!valobj_sp->IsPointerType() && valobj_sp->HasSyntheticValue()) {
+        Status deref_error;
+        if (valobj_sp->GetCompilerType().IsReferenceType()) {
+          valobj_sp = valobj_sp->GetSyntheticValue()->Dereference(deref_error);
+          if (error.Fail()) {
+            error.SetErrorStringWithFormatv(
+                "Failed to dereference reference type: %s", deref_error);
+            return ValueObjectSP();
+          }
+        }
+
+        valobj_sp = valobj_sp->Dereference(deref_error);
+        if (error.Fail()) {
+          error.SetErrorStringWithFormatv(
+              "Failed to dereference sythetic value: {0}", deref_error);
+          return ValueObjectSP();
+        }
+        // Some synthetic plug-ins fail to set the error in Dereference
+        if (!valobj_sp) {
+          error.SetErrorString("Failed to dereference sythetic value");
+          return ValueObjectSP();
+        }
+        expr_is_ptr = false;
+      }
+
+      var_expr = var_expr.drop_front(); // Remove the '-'
+      LLVM_FALLTHROUGH;
+    case '.': {
+      var_expr = var_expr.drop_front(); // Remove the '.' or '>'
+      separator_idx = var_expr.find_first_of(".-[");
+      ConstString child_name(var_expr.substr(0, var_expr.find_first_of(".-[")));
+
+      if (check_ptr_vs_member) {
+        // We either have a pointer type and need to verify valobj_sp is a
+        // pointer, or we have a member of a class/union/struct being accessed
+        // with the . syntax and need to verify we don't have a pointer.
+        const bool actual_is_ptr = valobj_sp->IsPointerType();
+
+        if (actual_is_ptr != expr_is_ptr) {
+          // Incorrect use of "." with a pointer, or "->" with a
+          // class/union/struct instance or reference.
+          valobj_sp->GetExpressionPath(var_expr_path_strm);
+          if (actual_is_ptr)
+            error.SetErrorStringWithFormat(
+                "\"%s\" is a pointer and . was used to attempt to access "
+                "\"%s\". Did you mean \"%s->%s\"?",
+                var_expr_path_strm.GetData(), child_name.GetCString(),
+                var_expr_path_strm.GetData(), var_expr.str().c_str());
+          else
+            error.SetErrorStringWithFormat(
+                "\"%s\" is not a pointer and -> was used to attempt to "
+                "access \"%s\". Did you mean \"%s.%s\"?",
+                var_expr_path_strm.GetData(), child_name.GetCString(),
+                var_expr_path_strm.GetData(), var_expr.str().c_str());
+          return ValueObjectSP();
+        }
+      }
+      child_valobj_sp = valobj_sp->GetChildMemberWithName(child_name, true);
+      if (!child_valobj_sp) {
+        if (!no_synth_child) {
+          child_valobj_sp = valobj_sp->GetSyntheticValue();
+          if (child_valobj_sp)
+            child_valobj_sp =
+                child_valobj_sp->GetChildMemberWithName(child_name, true);
+        }
+
+        if (no_synth_child || !child_valobj_sp) {
+          // No child member with name "child_name"
+          if (synthetically_added_instance_object) {
+            // We added a "this->" or "self->" to the beginning of the
+            // expression and this is the first pointer ivar access, so just
+            // return the normal error
+            error.SetErrorStringWithFormat(
+                "no variable or instance variable named '%s' found in "
+                "this frame",
+                name_const_string.GetCString());
+          } else {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            if (child_name) {
+              error.SetErrorStringWithFormat(
+                  "\"%s\" is not a member of \"(%s) %s\"",
+                  child_name.GetCString(),
+                  valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                  var_expr_path_strm.GetData());
+            } else {
+              error.SetErrorStringWithFormat(
+                  "incomplete expression path after \"%s\" in \"%s\"",
+                  var_expr_path_strm.GetData(),
+                  original_var_expr.str().c_str());
+            }
+          }
+          return ValueObjectSP();
+        }
+      }
+      synthetically_added_instance_object = false;
+      // Remove the child name from the path
+      var_expr = var_expr.drop_front(child_name.GetLength());
+      if (use_dynamic != eNoDynamicValues) {
+        ValueObjectSP dynamic_value_sp(
+            child_valobj_sp->GetDynamicValue(use_dynamic));
+        if (dynamic_value_sp)
+          child_valobj_sp = dynamic_value_sp;
+      }
+    } break;
+
+    case '[': {
+      // Array member access, or treating pointer as an array Need at least two
+      // brackets and a number
+      if (var_expr.size() <= 2) {
+        error.SetErrorStringWithFormat(
+            "invalid square bracket encountered after \"%s\" in \"%s\"",
+            var_expr_path_strm.GetData(), var_expr.str().c_str());
+        return ValueObjectSP();
+      }
+
+      // Drop the open brace.
+      var_expr = var_expr.drop_front();
+      long child_index = 0;
+
+      // If there's no closing brace, this is an invalid expression.
+      size_t end_pos = var_expr.find_first_of(']');
+      if (end_pos == llvm::StringRef::npos) {
+        error.SetErrorStringWithFormat(
+            "missing closing square bracket in expression \"%s\"",
+            var_expr_path_strm.GetData());
+        return ValueObjectSP();
+      }
+      llvm::StringRef index_expr = var_expr.take_front(end_pos);
+      llvm::StringRef original_index_expr = index_expr;
+      // Drop all of "[index_expr]"
+      var_expr = var_expr.drop_front(end_pos + 1);
+
+      if (index_expr.consumeInteger(0, child_index)) {
+        // If there was no integer anywhere in the index expression, this is
+        // erroneous expression.
+        error.SetErrorStringWithFormat("invalid index expression \"%s\"",
+                                       index_expr.str().c_str());
+        return ValueObjectSP();
+      }
+
+      if (index_expr.empty()) {
+        // The entire index expression was a single integer.
+
+        if (valobj_sp->GetCompilerType().IsPointerToScalarType() && deref) {
+          // what we have is *ptr[low]. the most similar C++ syntax is to deref
+          // ptr and extract bit low out of it. reading array item low would be
+          // done by saying ptr[low], without a deref * sign
+          Status error;
+          ValueObjectSP temp(valobj_sp->Dereference(error));
+          if (error.Fail()) {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            error.SetErrorStringWithFormat(
+                "could not dereference \"(%s) %s\"",
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+            return ValueObjectSP();
+          }
+          valobj_sp = temp;
+          deref = false;
+        } else if (valobj_sp->GetCompilerType().IsArrayOfScalarType() &&
+                   deref) {
+          // what we have is *arr[low]. the most similar C++ syntax is to get
+          // arr[0] (an operation that is equivalent to deref-ing arr) and
+          // extract bit low out of it. reading array item low would be done by
+          // saying arr[low], without a deref * sign
+          Status error;
+          ValueObjectSP temp(valobj_sp->GetChildAtIndex(0, true));
+          if (error.Fail()) {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            error.SetErrorStringWithFormat(
+                "could not get item 0 for \"(%s) %s\"",
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+            return ValueObjectSP();
+          }
+          valobj_sp = temp;
+          deref = false;
+        }
+
+        bool is_incomplete_array = false;
+        if (valobj_sp->IsPointerType()) {
+          bool is_objc_pointer = true;
+
+          if (valobj_sp->GetCompilerType().GetMinimumLanguage() !=
+              eLanguageTypeObjC)
+            is_objc_pointer = false;
+          else if (!valobj_sp->GetCompilerType().IsPointerType())
+            is_objc_pointer = false;
+
+          if (no_synth_child && is_objc_pointer) {
+            error.SetErrorStringWithFormat(
+                "\"(%s) %s\" is an Objective-C pointer, and cannot be "
+                "subscripted",
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+
+            return ValueObjectSP();
+          } else if (is_objc_pointer) {
+            // dereferencing ObjC variables is not valid.. so let's try and
+            // recur to synthetic children
+            ValueObjectSP synthetic = valobj_sp->GetSyntheticValue();
+            if (!synthetic                 /* no synthetic */
+                || synthetic == valobj_sp) /* synthetic is the same as
+                                              the original object */
+            {
+              valobj_sp->GetExpressionPath(var_expr_path_strm);
+              error.SetErrorStringWithFormat(
+                  "\"(%s) %s\" is not an array type",
+                  valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                  var_expr_path_strm.GetData());
+            } else if (
+                static_cast<uint32_t>(child_index) >=
+                synthetic
+                    ->GetNumChildren() /* synthetic does not have that many values */) {
+              valobj_sp->GetExpressionPath(var_expr_path_strm);
+              error.SetErrorStringWithFormat(
+                  "array index %ld is not valid for \"(%s) %s\"", child_index,
+                  valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                  var_expr_path_strm.GetData());
+            } else {
+              child_valobj_sp = synthetic->GetChildAtIndex(child_index, true);
+              if (!child_valobj_sp) {
+                valobj_sp->GetExpressionPath(var_expr_path_strm);
+                error.SetErrorStringWithFormat(
+                    "array index %ld is not valid for \"(%s) %s\"", child_index,
+                    valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                    var_expr_path_strm.GetData());
+              }
+            }
+          } else {
+            child_valobj_sp =
+                valobj_sp->GetSyntheticArrayMember(child_index, true);
+            if (!child_valobj_sp) {
+              valobj_sp->GetExpressionPath(var_expr_path_strm);
+              error.SetErrorStringWithFormat(
+                  "failed to use pointer as array for index %ld for "
+                  "\"(%s) %s\"",
+                  child_index,
+                  valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                  var_expr_path_strm.GetData());
+            }
+          }
+        } else if (valobj_sp->GetCompilerType().IsArrayType(
+                       nullptr, nullptr, &is_incomplete_array)) {
+          // Pass false to dynamic_value here so we can tell the difference
+          // between no dynamic value and no member of this type...
+          child_valobj_sp = valobj_sp->GetChildAtIndex(child_index, true);
+          if (!child_valobj_sp && (is_incomplete_array || !no_synth_child))
+            child_valobj_sp =
+                valobj_sp->GetSyntheticArrayMember(child_index, true);
+
+          if (!child_valobj_sp) {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            error.SetErrorStringWithFormat(
+                "array index %ld is not valid for \"(%s) %s\"", child_index,
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+          }
+        } else if (valobj_sp->GetCompilerType().IsScalarType()) {
+          // this is a bitfield asking to display just one bit
+          child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(
+              child_index, child_index, true);
+          if (!child_valobj_sp) {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            error.SetErrorStringWithFormat(
+                "bitfield range %ld-%ld is not valid for \"(%s) %s\"",
+                child_index, child_index,
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+          }
+        } else {
+          ValueObjectSP synthetic = valobj_sp->GetSyntheticValue();
+          if (no_synth_child /* synthetic is forbidden */ ||
+              !synthetic                 /* no synthetic */
+              || synthetic == valobj_sp) /* synthetic is the same as the
+                                            original object */
+          {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            error.SetErrorStringWithFormat(
+                "\"(%s) %s\" is not an array type",
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+          } else if (
+              static_cast<uint32_t>(child_index) >=
+              synthetic
+                  ->GetNumChildren() /* synthetic does not have that many values */) {
+            valobj_sp->GetExpressionPath(var_expr_path_strm);
+            error.SetErrorStringWithFormat(
+                "array index %ld is not valid for \"(%s) %s\"", child_index,
+                valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                var_expr_path_strm.GetData());
+          } else {
+            child_valobj_sp = synthetic->GetChildAtIndex(child_index, true);
+            if (!child_valobj_sp) {
+              valobj_sp->GetExpressionPath(var_expr_path_strm);
+              error.SetErrorStringWithFormat(
+                  "array index %ld is not valid for \"(%s) %s\"", child_index,
+                  valobj_sp->GetTypeName().AsCString("<invalid type>"),
+                  var_expr_path_strm.GetData());
+            }
+          }
+        }
+
+        if (!child_valobj_sp) {
+          // Invalid array index...
+          return ValueObjectSP();
+        }
+
+        separator_idx = var_expr.find_first_of(".-[");
+        if (use_dynamic != eNoDynamicValues) {
+          ValueObjectSP dynamic_value_sp(
+              child_valobj_sp->GetDynamicValue(use_dynamic));
+          if (dynamic_value_sp)
+            child_valobj_sp = dynamic_value_sp;
+        }
+        // Break out early from the switch since we were able to find the child
+        // member
+        break;
+      }
+
+      // this is most probably a BitField, let's take a look
+      if (index_expr.front() != '-') {
+        error.SetErrorStringWithFormat("invalid range expression \"'%s'\"",
+                                       original_index_expr.str().c_str());
+        return ValueObjectSP();
+      }
+
+      index_expr = index_expr.drop_front();
+      long final_index = 0;
+      if (index_expr.getAsInteger(0, final_index)) {
+        error.SetErrorStringWithFormat("invalid range expression \"'%s'\"",
+                                       original_index_expr.str().c_str());
+        return ValueObjectSP();
+      }
+
+      // if the format given is [high-low], swap range
+      if (child_index > final_index) {
+        long temp = child_index;
+        child_index = final_index;
+        final_index = temp;
+      }
+
+      if (valobj_sp->GetCompilerType().IsPointerToScalarType() && deref) {
+        // what we have is *ptr[low-high]. the most similar C++ syntax is to
+        // deref ptr and extract bits low thru high out of it. reading array
+        // items low thru high would be done by saying ptr[low-high], without a
+        // deref * sign
+        Status error;
+        ValueObjectSP temp(valobj_sp->Dereference(error));
+        if (error.Fail()) {
+          valobj_sp->GetExpressionPath(var_expr_path_strm);
+          error.SetErrorStringWithFormat(
+              "could not dereference \"(%s) %s\"",
+              valobj_sp->GetTypeName().AsCString("<invalid type>"),
+              var_expr_path_strm.GetData());
+          return ValueObjectSP();
+        }
+        valobj_sp = temp;
+        deref = false;
+      } else if (valobj_sp->GetCompilerType().IsArrayOfScalarType() && deref) {
+        // what we have is *arr[low-high]. the most similar C++ syntax is to
+        // get arr[0] (an operation that is equivalent to deref-ing arr) and
+        // extract bits low thru high out of it. reading array items low thru
+        // high would be done by saying arr[low-high], without a deref * sign
+        Status error;
+        ValueObjectSP temp(valobj_sp->GetChildAtIndex(0, true));
+        if (error.Fail()) {
+          valobj_sp->GetExpressionPath(var_expr_path_strm);
+          error.SetErrorStringWithFormat(
+              "could not get item 0 for \"(%s) %s\"",
+              valobj_sp->GetTypeName().AsCString("<invalid type>"),
+              var_expr_path_strm.GetData());
+          return ValueObjectSP();
+        }
+        valobj_sp = temp;
+        deref = false;
+      }
+
+      child_valobj_sp =
+          valobj_sp->GetSyntheticBitFieldChild(child_index, final_index, true);
+      if (!child_valobj_sp) {
+        valobj_sp->GetExpressionPath(var_expr_path_strm);
+        error.SetErrorStringWithFormat(
+            "bitfield range %ld-%ld is not valid for \"(%s) %s\"", child_index,
+            final_index, valobj_sp->GetTypeName().AsCString("<invalid type>"),
+            var_expr_path_strm.GetData());
+      }
+
+      if (!child_valobj_sp) {
+        // Invalid bitfield range...
+        return ValueObjectSP();
+      }
+
+      separator_idx = var_expr.find_first_of(".-[");
+      if (use_dynamic != eNoDynamicValues) {
+        ValueObjectSP dynamic_value_sp(
+            child_valobj_sp->GetDynamicValue(use_dynamic));
+        if (dynamic_value_sp)
+          child_valobj_sp = dynamic_value_sp;
+      }
+      // Break out early from the switch since we were able to find the child
+      // member
+      break;
+    }
+    default:
+      // Failure...
+      {
+        valobj_sp->GetExpressionPath(var_expr_path_strm);
+        error.SetErrorStringWithFormat(
+            "unexpected char '%c' encountered after \"%s\" in \"%s\"",
+            separator_type, var_expr_path_strm.GetData(),
+            var_expr.str().c_str());
+
+        return ValueObjectSP();
+      }
+    }
+
+    if (child_valobj_sp)
+      valobj_sp = child_valobj_sp;
+
+    if (var_expr.empty())
+      break;
+  }
+  if (valobj_sp) {
+    if (deref) {
+      ValueObjectSP deref_valobj_sp(valobj_sp->Dereference(error));
+      valobj_sp = deref_valobj_sp;
+    } else if (address_of) {
+      ValueObjectSP address_of_valobj_sp(valobj_sp->AddressOf(error));
+      valobj_sp = address_of_valobj_sp;
+    }
+  }
+  return valobj_sp;
+}
+
+bool StackFrame::GetFrameBaseValue(Scalar &frame_base, Status *error_ptr) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  if (!m_cfa_is_valid) {
+    m_frame_base_error.SetErrorString(
+        "No frame base available for this historical stack frame.");
+    return false;
+  }
+
+  if (m_flags.IsClear(GOT_FRAME_BASE)) {
+    if (m_sc.function) {
+      m_frame_base.Clear();
+      m_frame_base_error.Clear();
+
+      m_flags.Set(GOT_FRAME_BASE);
+      ExecutionContext exe_ctx(shared_from_this());
+      Value expr_value;
+      addr_t loclist_base_addr = LLDB_INVALID_ADDRESS;
+      if (m_sc.function->GetFrameBaseExpression().IsLocationList())
+        loclist_base_addr =
+            m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress(
+                exe_ctx.GetTargetPtr());
+
+      if (!m_sc.function->GetFrameBaseExpression().Evaluate(
+              &exe_ctx, nullptr, loclist_base_addr, nullptr, nullptr,
+              expr_value, &m_frame_base_error)) {
+        // We should really have an error if evaluate returns, but in case we
+        // don't, lets set the error to something at least.
+        if (m_frame_base_error.Success())
+          m_frame_base_error.SetErrorString(
+              "Evaluation of the frame base expression failed.");
+      } else {
+        m_frame_base = expr_value.ResolveValue(&exe_ctx);
+      }
+    } else {
+      m_frame_base_error.SetErrorString("No function in symbol context.");
+    }
+  }
+
+  if (m_frame_base_error.Success())
+    frame_base = m_frame_base;
+
+  if (error_ptr)
+    *error_ptr = m_frame_base_error;
+  return m_frame_base_error.Success();
+}
+
+DWARFExpression *StackFrame::GetFrameBaseExpression(Status *error_ptr) {
+  if (!m_sc.function) {
+    if (error_ptr) {
+      error_ptr->SetErrorString("No function in symbol context.");
+    }
+    return nullptr;
+  }
+
+  return &m_sc.function->GetFrameBaseExpression();
+}
+
+RegisterContextSP StackFrame::GetRegisterContext() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  if (!m_reg_context_sp) {
+    ThreadSP thread_sp(GetThread());
+    if (thread_sp)
+      m_reg_context_sp = thread_sp->CreateRegisterContextForFrame(this);
+  }
+  return m_reg_context_sp;
+}
+
+bool StackFrame::HasDebugInformation() {
+  GetSymbolContext(eSymbolContextLineEntry);
+  return m_sc.line_entry.IsValid();
+}
+
+ValueObjectSP
+StackFrame::GetValueObjectForFrameVariable(const VariableSP &variable_sp,
+                                           DynamicValueType use_dynamic) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  ValueObjectSP valobj_sp;
+  if (IsHistorical()) {
+    return valobj_sp;
+  }
+  VariableList *var_list = GetVariableList(true);
+  if (var_list) {
+    // Make sure the variable is a frame variable
+    const uint32_t var_idx = var_list->FindIndexForVariable(variable_sp.get());
+    const uint32_t num_variables = var_list->GetSize();
+    if (var_idx < num_variables) {
+      valobj_sp = m_variable_list_value_objects.GetValueObjectAtIndex(var_idx);
+      if (!valobj_sp) {
+        if (m_variable_list_value_objects.GetSize() < num_variables)
+          m_variable_list_value_objects.Resize(num_variables);
+        valobj_sp = ValueObjectVariable::Create(this, variable_sp);
+        m_variable_list_value_objects.SetValueObjectAtIndex(var_idx, valobj_sp);
+      }
+    }
+  }
+  if (use_dynamic != eNoDynamicValues && valobj_sp) {
+    ValueObjectSP dynamic_sp = valobj_sp->GetDynamicValue(use_dynamic);
+    if (dynamic_sp)
+      return dynamic_sp;
+  }
+  return valobj_sp;
+}
+
+ValueObjectSP StackFrame::TrackGlobalVariable(const VariableSP &variable_sp,
+                                              DynamicValueType use_dynamic) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  if (IsHistorical())
+    return ValueObjectSP();
+
+  // Check to make sure we aren't already tracking this variable?
+  ValueObjectSP valobj_sp(
+      GetValueObjectForFrameVariable(variable_sp, use_dynamic));
+  if (!valobj_sp) {
+    // We aren't already tracking this global
+    VariableList *var_list = GetVariableList(true);
+    // If this frame has no variables, create a new list
+    if (var_list == nullptr)
+      m_variable_list_sp = std::make_shared<VariableList>();
+
+    // Add the global/static variable to this frame
+    m_variable_list_sp->AddVariable(variable_sp);
+
+    // Now make a value object for it so we can track its changes
+    valobj_sp = GetValueObjectForFrameVariable(variable_sp, use_dynamic);
+  }
+  return valobj_sp;
+}
+
+bool StackFrame::IsInlined() {
+  if (m_sc.block == nullptr)
+    GetSymbolContext(eSymbolContextBlock);
+  if (m_sc.block)
+    return m_sc.block->GetContainingInlinedBlock() != nullptr;
+  return false;
+}
+
+bool StackFrame::IsHistorical() const {
+  return m_stack_frame_kind == StackFrame::Kind::History;
+}
+
+bool StackFrame::IsArtificial() const {
+  return m_stack_frame_kind == StackFrame::Kind::Artificial;
+}
+
+lldb::LanguageType StackFrame::GetLanguage() {
+  CompileUnit *cu = GetSymbolContext(eSymbolContextCompUnit).comp_unit;
+  if (cu)
+    return cu->GetLanguage();
+  return lldb::eLanguageTypeUnknown;
+}
+
+lldb::LanguageType StackFrame::GuessLanguage() {
+  LanguageType lang_type = GetLanguage();
+
+  if (lang_type == eLanguageTypeUnknown) {
+    SymbolContext sc = GetSymbolContext(eSymbolContextFunction 
+                                        | eSymbolContextSymbol);
+    if (sc.function) {
+      lang_type = sc.function->GetMangled().GuessLanguage();
+    }
+    else if (sc.symbol)
+    {
+      lang_type = sc.symbol->GetMangled().GuessLanguage();
+    }
+  }
+
+  return lang_type;
+}
+
+namespace {
+std::pair<const Instruction::Operand *, int64_t>
+GetBaseExplainingValue(const Instruction::Operand &operand,
+                       RegisterContext &register_context, lldb::addr_t value) {
+  switch (operand.m_type) {
+  case Instruction::Operand::Type::Dereference:
+  case Instruction::Operand::Type::Immediate:
+  case Instruction::Operand::Type::Invalid:
+  case Instruction::Operand::Type::Product:
+    // These are not currently interesting
+    return std::make_pair(nullptr, 0);
+  case Instruction::Operand::Type::Sum: {
+    const Instruction::Operand *immediate_child = nullptr;
+    const Instruction::Operand *variable_child = nullptr;
+    if (operand.m_children[0].m_type == Instruction::Operand::Type::Immediate) {
+      immediate_child = &operand.m_children[0];
+      variable_child = &operand.m_children[1];
+    } else if (operand.m_children[1].m_type ==
+               Instruction::Operand::Type::Immediate) {
+      immediate_child = &operand.m_children[1];
+      variable_child = &operand.m_children[0];
+    }
+    if (!immediate_child) {
+      return std::make_pair(nullptr, 0);
+    }
+    lldb::addr_t adjusted_value = value;
+    if (immediate_child->m_negative) {
+      adjusted_value += immediate_child->m_immediate;
+    } else {
+      adjusted_value -= immediate_child->m_immediate;
+    }
+    std::pair<const Instruction::Operand *, int64_t> base_and_offset =
+        GetBaseExplainingValue(*variable_child, register_context,
+                               adjusted_value);
+    if (!base_and_offset.first) {
+      return std::make_pair(nullptr, 0);
+    }
+    if (immediate_child->m_negative) {
+      base_and_offset.second -= immediate_child->m_immediate;
+    } else {
+      base_and_offset.second += immediate_child->m_immediate;
+    }
+    return base_and_offset;
+  }
+  case Instruction::Operand::Type::Register: {
+    const RegisterInfo *info =
+        register_context.GetRegisterInfoByName(operand.m_register.AsCString());
+    if (!info) {
+      return std::make_pair(nullptr, 0);
+    }
+    RegisterValue reg_value;
+    if (!register_context.ReadRegister(info, reg_value)) {
+      return std::make_pair(nullptr, 0);
+    }
+    if (reg_value.GetAsUInt64() == value) {
+      return std::make_pair(&operand, 0);
+    } else {
+      return std::make_pair(nullptr, 0);
+    }
+  }
+  }
+  return std::make_pair(nullptr, 0);
+}
+
+std::pair<const Instruction::Operand *, int64_t>
+GetBaseExplainingDereference(const Instruction::Operand &operand,
+                             RegisterContext &register_context,
+                             lldb::addr_t addr) {
+  if (operand.m_type == Instruction::Operand::Type::Dereference) {
+    return GetBaseExplainingValue(operand.m_children[0], register_context,
+                                  addr);
+  }
+  return std::make_pair(nullptr, 0);
+}
+}
+
+lldb::ValueObjectSP StackFrame::GuessValueForAddress(lldb::addr_t addr) {
+  TargetSP target_sp = CalculateTarget();
+
+  const ArchSpec &target_arch = target_sp->GetArchitecture();
+
+  AddressRange pc_range;
+  pc_range.GetBaseAddress() = GetFrameCodeAddress();
+  pc_range.SetByteSize(target_arch.GetMaximumOpcodeByteSize());
+
+  ExecutionContext exe_ctx(shared_from_this());
+
+  const char *plugin_name = nullptr;
+  const char *flavor = nullptr;
+  const bool prefer_file_cache = false;
+
+  DisassemblerSP disassembler_sp = Disassembler::DisassembleRange(
+      target_arch, plugin_name, flavor, exe_ctx, pc_range, prefer_file_cache);
+
+  if (!disassembler_sp || !disassembler_sp->GetInstructionList().GetSize()) {
+    return ValueObjectSP();
+  }
+
+  InstructionSP instruction_sp =
+      disassembler_sp->GetInstructionList().GetInstructionAtIndex(0);
+
+  llvm::SmallVector<Instruction::Operand, 3> operands;
+
+  if (!instruction_sp->ParseOperands(operands)) {
+    return ValueObjectSP();
+  }
+
+  RegisterContextSP register_context_sp = GetRegisterContext();
+
+  if (!register_context_sp) {
+    return ValueObjectSP();
+  }
+
+  for (const Instruction::Operand &operand : operands) {
+    std::pair<const Instruction::Operand *, int64_t> base_and_offset =
+        GetBaseExplainingDereference(operand, *register_context_sp, addr);
+
+    if (!base_and_offset.first) {
+      continue;
+    }
+
+    switch (base_and_offset.first->m_type) {
+    case Instruction::Operand::Type::Immediate: {
+      lldb_private::Address addr;
+      if (target_sp->ResolveLoadAddress(base_and_offset.first->m_immediate +
+                                            base_and_offset.second,
+                                        addr)) {
+        auto c_type_system_or_err =
+            target_sp->GetScratchTypeSystemForLanguage(eLanguageTypeC);
+        if (auto err = c_type_system_or_err.takeError()) {
+          LLDB_LOG_ERROR(
+              lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_THREAD),
+              std::move(err), "Unable to guess value for given address");
+          return ValueObjectSP();
+        } else {
+          CompilerType void_ptr_type =
+              c_type_system_or_err
+                  ->GetBasicTypeFromAST(lldb::BasicType::eBasicTypeChar)
+                  .GetPointerType();
+          return ValueObjectMemory::Create(this, "", addr, void_ptr_type);
+        }
+      } else {
+        return ValueObjectSP();
+      }
+      break;
+    }
+    case Instruction::Operand::Type::Register: {
+      return GuessValueForRegisterAndOffset(base_and_offset.first->m_register,
+                                            base_and_offset.second);
+    }
+    default:
+      return ValueObjectSP();
+    }
+  }
+
+  return ValueObjectSP();
+}
+
+namespace {
+ValueObjectSP GetValueForOffset(StackFrame &frame, ValueObjectSP &parent,
+                                int64_t offset) {
+  if (offset < 0 || uint64_t(offset) >= parent->GetByteSize()) {
+    return ValueObjectSP();
+  }
+
+  if (parent->IsPointerOrReferenceType()) {
+    return parent;
+  }
+
+  for (int ci = 0, ce = parent->GetNumChildren(); ci != ce; ++ci) {
+    const bool can_create = true;
+    ValueObjectSP child_sp = parent->GetChildAtIndex(ci, can_create);
+
+    if (!child_sp) {
+      return ValueObjectSP();
+    }
+
+    int64_t child_offset = child_sp->GetByteOffset();
+    int64_t child_size = child_sp->GetByteSize();
+
+    if (offset >= child_offset && offset < (child_offset + child_size)) {
+      return GetValueForOffset(frame, child_sp, offset - child_offset);
+    }
+  }
+
+  if (offset == 0) {
+    return parent;
+  } else {
+    return ValueObjectSP();
+  }
+}
+
+ValueObjectSP GetValueForDereferincingOffset(StackFrame &frame,
+                                             ValueObjectSP &base,
+                                             int64_t offset) {
+  // base is a pointer to something
+  // offset is the thing to add to the pointer We return the most sensible
+  // ValueObject for the result of *(base+offset)
+
+  if (!base->IsPointerOrReferenceType()) {
+    return ValueObjectSP();
+  }
+
+  Status error;
+  ValueObjectSP pointee = base->Dereference(error);
+    
+  if (!pointee) {
+    return ValueObjectSP();
+  }
+
+  if (offset >= 0 && uint64_t(offset) >= pointee->GetByteSize()) {
+    int64_t index = offset / pointee->GetByteSize();
+    offset = offset % pointee->GetByteSize();
+    const bool can_create = true;
+    pointee = base->GetSyntheticArrayMember(index, can_create);
+  }
+
+  if (!pointee || error.Fail()) {
+    return ValueObjectSP();
+  }
+
+  return GetValueForOffset(frame, pointee, offset);
+}
+
+/// Attempt to reconstruct the ValueObject for the address contained in a
+/// given register plus an offset.
+///
+/// \params [in] frame
+///   The current stack frame.
+///
+/// \params [in] reg
+///   The register.
+///
+/// \params [in] offset
+///   The offset from the register.
+///
+/// \param [in] disassembler
+///   A disassembler containing instructions valid up to the current PC.
+///
+/// \param [in] variables
+///   The variable list from the current frame,
+///
+/// \param [in] pc
+///   The program counter for the instruction considered the 'user'.
+///
+/// \return
+///   A string describing the base for the ExpressionPath.  This could be a
+///     variable, a register value, an argument, or a function return value.
+///   The ValueObject if found.  If valid, it has a valid ExpressionPath.
+lldb::ValueObjectSP DoGuessValueAt(StackFrame &frame, ConstString reg,
+                                   int64_t offset, Disassembler &disassembler,
+                                   VariableList &variables, const Address &pc) {
+  // Example of operation for Intel:
+  //
+  // +14: movq   -0x8(%rbp), %rdi
+  // +18: movq   0x8(%rdi), %rdi
+  // +22: addl   0x4(%rdi), %eax
+  //
+  // f, a pointer to a struct, is known to be at -0x8(%rbp).
+  //
+  // DoGuessValueAt(frame, rdi, 4, dis, vars, 0x22) finds the instruction at
+  // +18 that assigns to rdi, and calls itself recursively for that dereference
+  //   DoGuessValueAt(frame, rdi, 8, dis, vars, 0x18) finds the instruction at
+  //   +14 that assigns to rdi, and calls itself recursively for that
+  //   derefernece
+  //     DoGuessValueAt(frame, rbp, -8, dis, vars, 0x14) finds "f" in the
+  //     variable list.
+  //     Returns a ValueObject for f.  (That's what was stored at rbp-8 at +14)
+  //   Returns a ValueObject for *(f+8) or f->b (That's what was stored at rdi+8
+  //   at +18)
+  // Returns a ValueObject for *(f->b+4) or f->b->a (That's what was stored at
+  // rdi+4 at +22)
+
+  // First, check the variable list to see if anything is at the specified
+  // location.
+
+  using namespace OperandMatchers;
+
+  const RegisterInfo *reg_info =
+      frame.GetRegisterContext()->GetRegisterInfoByName(reg.AsCString());
+  if (!reg_info) {
+    return ValueObjectSP();
+  }
+
+  Instruction::Operand op =
+      offset ? Instruction::Operand::BuildDereference(
+                   Instruction::Operand::BuildSum(
+                       Instruction::Operand::BuildRegister(reg),
+                       Instruction::Operand::BuildImmediate(offset)))
+             : Instruction::Operand::BuildDereference(
+                   Instruction::Operand::BuildRegister(reg));
+
+  for (VariableSP var_sp : variables) {
+    if (var_sp->LocationExpression().MatchesOperand(frame, op))
+      return frame.GetValueObjectForFrameVariable(var_sp, eNoDynamicValues);
+  }
+
+  const uint32_t current_inst =
+      disassembler.GetInstructionList().GetIndexOfInstructionAtAddress(pc);
+  if (current_inst == UINT32_MAX) {
+    return ValueObjectSP();
+  }
+
+  for (uint32_t ii = current_inst - 1; ii != (uint32_t)-1; --ii) {
+    // This is not an exact algorithm, and it sacrifices accuracy for
+    // generality.  Recognizing "mov" and "ld" instructions –– and which
+    // are their source and destination operands -- is something the
+    // disassembler should do for us.
+    InstructionSP instruction_sp =
+        disassembler.GetInstructionList().GetInstructionAtIndex(ii);
+
+    if (instruction_sp->IsCall()) {
+      ABISP abi_sp = frame.CalculateProcess()->GetABI();
+      if (!abi_sp) {
+        continue;
+      }
+
+      const char *return_register_name;
+      if (!abi_sp->GetPointerReturnRegister(return_register_name)) {
+        continue;
+      }
+
+      const RegisterInfo *return_register_info =
+          frame.GetRegisterContext()->GetRegisterInfoByName(
+              return_register_name);
+      if (!return_register_info) {
+        continue;
+      }
+
+      int64_t offset = 0;
+
+      if (!MatchUnaryOp(MatchOpType(Instruction::Operand::Type::Dereference),
+                        MatchRegOp(*return_register_info))(op) &&
+          !MatchUnaryOp(
+              MatchOpType(Instruction::Operand::Type::Dereference),
+              MatchBinaryOp(MatchOpType(Instruction::Operand::Type::Sum),
+                            MatchRegOp(*return_register_info),
+                            FetchImmOp(offset)))(op)) {
+        continue;
+      }
+
+      llvm::SmallVector<Instruction::Operand, 1> operands;
+      if (!instruction_sp->ParseOperands(operands) || operands.size() != 1) {
+        continue;
+      }
+
+      switch (operands[0].m_type) {
+      default:
+        break;
+      case Instruction::Operand::Type::Immediate: {
+        SymbolContext sc;
+        Address load_address;
+        if (!frame.CalculateTarget()->ResolveLoadAddress(
+                operands[0].m_immediate, load_address)) {
+          break;
+        }
+        frame.CalculateTarget()->GetImages().ResolveSymbolContextForAddress(
+            load_address, eSymbolContextFunction, sc);
+        if (!sc.function) {
+          break;
+        }
+        CompilerType function_type = sc.function->GetCompilerType();
+        if (!function_type.IsFunctionType()) {
+          break;
+        }
+        CompilerType return_type = function_type.GetFunctionReturnType();
+        RegisterValue return_value;
+        if (!frame.GetRegisterContext()->ReadRegister(return_register_info,
+                                                      return_value)) {
+          break;
+        }
+        std::string name_str(
+            sc.function->GetName().AsCString("<unknown function>"));
+        name_str.append("()");
+        Address return_value_address(return_value.GetAsUInt64());
+        ValueObjectSP return_value_sp = ValueObjectMemory::Create(
+            &frame, name_str, return_value_address, return_type);
+        return GetValueForDereferincingOffset(frame, return_value_sp, offset);
+      }
+      }
+
+      continue;
+    }
+
+    llvm::SmallVector<Instruction::Operand, 2> operands;
+    if (!instruction_sp->ParseOperands(operands) || operands.size() != 2) {
+      continue;
+    }
+
+    Instruction::Operand *origin_operand = nullptr;
+    auto clobbered_reg_matcher = [reg_info](const Instruction::Operand &op) {
+      return MatchRegOp(*reg_info)(op) && op.m_clobbered;
+    };
+
+    if (clobbered_reg_matcher(operands[0])) {
+      origin_operand = &operands[1];
+    }
+    else if (clobbered_reg_matcher(operands[1])) {
+      origin_operand = &operands[0];
+    }
+    else {
+      continue;
+    }
+
+    // We have an origin operand.  Can we track its value down?
+    ValueObjectSP source_path;
+    ConstString origin_register;
+    int64_t origin_offset = 0;
+
+    if (FetchRegOp(origin_register)(*origin_operand)) {
+      source_path = DoGuessValueAt(frame, origin_register, 0, disassembler,
+                                   variables, instruction_sp->GetAddress());
+    } else if (MatchUnaryOp(
+                   MatchOpType(Instruction::Operand::Type::Dereference),
+                   FetchRegOp(origin_register))(*origin_operand) ||
+               MatchUnaryOp(
+                   MatchOpType(Instruction::Operand::Type::Dereference),
+                   MatchBinaryOp(MatchOpType(Instruction::Operand::Type::Sum),
+                                 FetchRegOp(origin_register),
+                                 FetchImmOp(origin_offset)))(*origin_operand)) {
+      source_path =
+          DoGuessValueAt(frame, origin_register, origin_offset, disassembler,
+                         variables, instruction_sp->GetAddress());
+      if (!source_path) {
+        continue;
+      }
+      source_path =
+          GetValueForDereferincingOffset(frame, source_path, offset);
+    }
+
+    if (source_path) {
+      return source_path;
+    }
+  }
+
+  return ValueObjectSP();
+}
+}
+
+lldb::ValueObjectSP StackFrame::GuessValueForRegisterAndOffset(ConstString reg,
+                                                               int64_t offset) {
+  TargetSP target_sp = CalculateTarget();
+
+  const ArchSpec &target_arch = target_sp->GetArchitecture();
+
+  Block *frame_block = GetFrameBlock();
+
+  if (!frame_block) {
+    return ValueObjectSP();
+  }
+
+  Function *function = frame_block->CalculateSymbolContextFunction();
+  if (!function) {
+    return ValueObjectSP();
+  }
+
+  AddressRange pc_range = function->GetAddressRange();
+
+  if (GetFrameCodeAddress().GetFileAddress() <
+          pc_range.GetBaseAddress().GetFileAddress() ||
+      GetFrameCodeAddress().GetFileAddress() -
+              pc_range.GetBaseAddress().GetFileAddress() >=
+          pc_range.GetByteSize()) {
+    return ValueObjectSP();
+  }
+
+  ExecutionContext exe_ctx(shared_from_this());
+
+  const char *plugin_name = nullptr;
+  const char *flavor = nullptr;
+  const bool prefer_file_cache = false;
+  DisassemblerSP disassembler_sp = Disassembler::DisassembleRange(
+      target_arch, plugin_name, flavor, exe_ctx, pc_range, prefer_file_cache);
+
+  if (!disassembler_sp || !disassembler_sp->GetInstructionList().GetSize()) {
+    return ValueObjectSP();
+  }
+
+  const bool get_file_globals = false;
+  VariableList *variables = GetVariableList(get_file_globals);
+
+  if (!variables) {
+    return ValueObjectSP();
+  }
+
+  return DoGuessValueAt(*this, reg, offset, *disassembler_sp, *variables,
+                        GetFrameCodeAddress());
+}
+
+lldb::ValueObjectSP StackFrame::FindVariable(ConstString name) {
+  ValueObjectSP value_sp;
+
+  if (!name)
+    return value_sp;
+
+  TargetSP target_sp = CalculateTarget();
+  ProcessSP process_sp = CalculateProcess();
+
+  if (!target_sp && !process_sp)
+    return value_sp;
+
+  VariableList variable_list;
+  VariableSP var_sp;
+  SymbolContext sc(GetSymbolContext(eSymbolContextBlock));
+
+  if (sc.block) {
+    const bool can_create = true;
+    const bool get_parent_variables = true;
+    const bool stop_if_block_is_inlined_function = true;
+
+    if (sc.block->AppendVariables(
+            can_create, get_parent_variables, stop_if_block_is_inlined_function,
+            [this](Variable *v) { return v->IsInScope(this); },
+            &variable_list)) {
+      var_sp = variable_list.FindVariable(name);
+    }
+
+    if (var_sp)
+      value_sp = GetValueObjectForFrameVariable(var_sp, eNoDynamicValues);
+  }
+
+  return value_sp;
+}
+
+TargetSP StackFrame::CalculateTarget() {
+  TargetSP target_sp;
+  ThreadSP thread_sp(GetThread());
+  if (thread_sp) {
+    ProcessSP process_sp(thread_sp->CalculateProcess());
+    if (process_sp)
+      target_sp = process_sp->CalculateTarget();
+  }
+  return target_sp;
+}
+
+ProcessSP StackFrame::CalculateProcess() {
+  ProcessSP process_sp;
+  ThreadSP thread_sp(GetThread());
+  if (thread_sp)
+    process_sp = thread_sp->CalculateProcess();
+  return process_sp;
+}
+
+ThreadSP StackFrame::CalculateThread() { return GetThread(); }
+
+StackFrameSP StackFrame::CalculateStackFrame() { return shared_from_this(); }
+
+void StackFrame::CalculateExecutionContext(ExecutionContext &exe_ctx) {
+  exe_ctx.SetContext(shared_from_this());
+}
+
+void StackFrame::DumpUsingSettingsFormat(Stream *strm, bool show_unique,
+                                         const char *frame_marker) {
+  if (strm == nullptr)
+    return;
+
+  GetSymbolContext(eSymbolContextEverything);
+  ExecutionContext exe_ctx(shared_from_this());
+  StreamString s;
+
+  if (frame_marker)
+    s.PutCString(frame_marker);
+
+  const FormatEntity::Entry *frame_format = nullptr;
+  Target *target = exe_ctx.GetTargetPtr();
+  if (target) {
+    if (show_unique) {
+      frame_format = target->GetDebugger().GetFrameFormatUnique();
+    } else {
+      frame_format = target->GetDebugger().GetFrameFormat();
+    }
+  }
+  if (frame_format && FormatEntity::Format(*frame_format, s, &m_sc, &exe_ctx,
+                                           nullptr, nullptr, false, false)) {
+    strm->PutCString(s.GetString());
+  } else {
+    Dump(strm, true, false);
+    strm->EOL();
+  }
+}
+
+void StackFrame::Dump(Stream *strm, bool show_frame_index,
+                      bool show_fullpaths) {
+  if (strm == nullptr)
+    return;
+
+  if (show_frame_index)
+    strm->Printf("frame #%u: ", m_frame_index);
+  ExecutionContext exe_ctx(shared_from_this());
+  Target *target = exe_ctx.GetTargetPtr();
+  strm->Printf("0x%0*" PRIx64 " ",
+               target ? (target->GetArchitecture().GetAddressByteSize() * 2)
+                      : 16,
+               GetFrameCodeAddress().GetLoadAddress(target));
+  GetSymbolContext(eSymbolContextEverything);
+  const bool show_module = true;
+  const bool show_inline = true;
+  const bool show_function_arguments = true;
+  const bool show_function_name = true;
+  m_sc.DumpStopContext(strm, exe_ctx.GetBestExecutionContextScope(),
+                       GetFrameCodeAddress(), show_fullpaths, show_module,
+                       show_inline, show_function_arguments,
+                       show_function_name);
+}
+
+void StackFrame::UpdateCurrentFrameFromPreviousFrame(StackFrame &prev_frame) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  assert(GetStackID() ==
+         prev_frame.GetStackID()); // TODO: remove this after some testing
+  m_variable_list_sp = prev_frame.m_variable_list_sp;
+  m_variable_list_value_objects.Swap(prev_frame.m_variable_list_value_objects);
+  if (!m_disassembly.GetString().empty()) {
+    m_disassembly.Clear();
+    m_disassembly.PutCString(prev_frame.m_disassembly.GetString());
+  }
+}
+
+void StackFrame::UpdatePreviousFrameFromCurrentFrame(StackFrame &curr_frame) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  assert(GetStackID() ==
+         curr_frame.GetStackID());     // TODO: remove this after some testing
+  m_id.SetPC(curr_frame.m_id.GetPC()); // Update the Stack ID PC value
+  assert(GetThread() == curr_frame.GetThread());
+  m_frame_index = curr_frame.m_frame_index;
+  m_concrete_frame_index = curr_frame.m_concrete_frame_index;
+  m_reg_context_sp = curr_frame.m_reg_context_sp;
+  m_frame_code_addr = curr_frame.m_frame_code_addr;
+  assert(!m_sc.target_sp || !curr_frame.m_sc.target_sp ||
+         m_sc.target_sp.get() == curr_frame.m_sc.target_sp.get());
+  assert(!m_sc.module_sp || !curr_frame.m_sc.module_sp ||
+         m_sc.module_sp.get() == curr_frame.m_sc.module_sp.get());
+  assert(m_sc.comp_unit == nullptr || curr_frame.m_sc.comp_unit == nullptr ||
+         m_sc.comp_unit == curr_frame.m_sc.comp_unit);
+  assert(m_sc.function == nullptr || curr_frame.m_sc.function == nullptr ||
+         m_sc.function == curr_frame.m_sc.function);
+  m_sc = curr_frame.m_sc;
+  m_flags.Clear(GOT_FRAME_BASE | eSymbolContextEverything);
+  m_flags.Set(m_sc.GetResolvedMask());
+  m_frame_base.Clear();
+  m_frame_base_error.Clear();
+}
+
+bool StackFrame::HasCachedData() const {
+  if (m_variable_list_sp)
+    return true;
+  if (m_variable_list_value_objects.GetSize() > 0)
+    return true;
+  if (!m_disassembly.GetString().empty())
+    return true;
+  return false;
+}
+
+bool StackFrame::GetStatus(Stream &strm, bool show_frame_info, bool show_source,
+                           bool show_unique, const char *frame_marker) {
+  if (show_frame_info) {
+    strm.Indent();
+    DumpUsingSettingsFormat(&strm, show_unique, frame_marker);
+  }
+
+  if (show_source) {
+    ExecutionContext exe_ctx(shared_from_this());
+    bool have_source = false, have_debuginfo = false;
+    Debugger::StopDisassemblyType disasm_display =
+        Debugger::eStopDisassemblyTypeNever;
+    Target *target = exe_ctx.GetTargetPtr();
+    if (target) {
+      Debugger &debugger = target->GetDebugger();
+      const uint32_t source_lines_before =
+          debugger.GetStopSourceLineCount(true);
+      const uint32_t source_lines_after =
+          debugger.GetStopSourceLineCount(false);
+      disasm_display = debugger.GetStopDisassemblyDisplay();
+
+      GetSymbolContext(eSymbolContextCompUnit | eSymbolContextLineEntry);
+      if (m_sc.comp_unit && m_sc.line_entry.IsValid()) {
+        have_debuginfo = true;
+        if (source_lines_before > 0 || source_lines_after > 0) {
+          size_t num_lines =
+              target->GetSourceManager().DisplaySourceLinesWithLineNumbers(
+                  m_sc.line_entry.file, m_sc.line_entry.line,
+                  m_sc.line_entry.column, source_lines_before,
+                  source_lines_after, "->", &strm);
+          if (num_lines != 0)
+            have_source = true;
+          // TODO: Give here a one time warning if source file is missing.
+        }
+      }
+      switch (disasm_display) {
+      case Debugger::eStopDisassemblyTypeNever:
+        break;
+
+      case Debugger::eStopDisassemblyTypeNoDebugInfo:
+        if (have_debuginfo)
+          break;
+        LLVM_FALLTHROUGH;
+
+      case Debugger::eStopDisassemblyTypeNoSource:
+        if (have_source)
+          break;
+        LLVM_FALLTHROUGH;
+
+      case Debugger::eStopDisassemblyTypeAlways:
+        if (target) {
+          const uint32_t disasm_lines = debugger.GetDisassemblyLineCount();
+          if (disasm_lines > 0) {
+            const ArchSpec &target_arch = target->GetArchitecture();
+            AddressRange pc_range;
+            pc_range.GetBaseAddress() = GetFrameCodeAddress();
+            pc_range.SetByteSize(disasm_lines *
+                                 target_arch.GetMaximumOpcodeByteSize());
+            const char *plugin_name = nullptr;
+            const char *flavor = nullptr;
+            const bool mixed_source_and_assembly = false;
+            Disassembler::Disassemble(
+                target->GetDebugger(), target_arch, plugin_name, flavor,
+                exe_ctx, pc_range, disasm_lines, mixed_source_and_assembly, 0,
+                Disassembler::eOptionMarkPCAddress, strm);
+          }
+        }
+        break;
+      }
+    }
+  }
+  return true;
+}
+
+RecognizedStackFrameSP StackFrame::GetRecognizedFrame() {
+  if (!m_recognized_frame_sp) {
+    m_recognized_frame_sp =
+        StackFrameRecognizerManager::RecognizeFrame(CalculateStackFrame());
+  }
+  return m_recognized_frame_sp;
+}