1 files changed, 389 insertions, 0 deletions

diff --git a/contrib/llvm-project/lldb/source/Core/ValueObjectDynamicValue.cpp b/contrib/llvm-project/lldb/source/Core/ValueObjectDynamicValue.cpp
new file mode 100644
index 000000000000..90b46d1f170d
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Core/ValueObjectDynamicValue.cpp
@@ -0,0 +1,389 @@
+//===-- ValueObjectDynamicValue.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 "lldb/Core/ValueObjectDynamicValue.h"
+#include "lldb/Core/Value.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Symbol/CompilerType.h"
+#include "lldb/Symbol/Type.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/LanguageRuntime.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/DataExtractor.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Logging.h"
+#include "lldb/Utility/Scalar.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/lldb-types.h"
+
+#include <string.h>
+namespace lldb_private {
+class Declaration;
+}
+
+using namespace lldb_private;
+
+ValueObjectDynamicValue::ValueObjectDynamicValue(
+    ValueObject &parent, lldb::DynamicValueType use_dynamic)
+    : ValueObject(parent), m_address(), m_dynamic_type_info(),
+      m_use_dynamic(use_dynamic) {
+  SetName(parent.GetName());
+}
+
+ValueObjectDynamicValue::~ValueObjectDynamicValue() {
+  m_owning_valobj_sp.reset();
+}
+
+CompilerType ValueObjectDynamicValue::GetCompilerTypeImpl() {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success) {
+    if (m_dynamic_type_info.HasType())
+      return m_value.GetCompilerType();
+    else
+      return m_parent->GetCompilerType();
+  }
+  return m_parent->GetCompilerType();
+}
+
+ConstString ValueObjectDynamicValue::GetTypeName() {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success) {
+    if (m_dynamic_type_info.HasName())
+      return m_dynamic_type_info.GetName();
+  }
+  return m_parent->GetTypeName();
+}
+
+TypeImpl ValueObjectDynamicValue::GetTypeImpl() {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success && m_type_impl.IsValid()) {
+    return m_type_impl;
+  }
+  return m_parent->GetTypeImpl();
+}
+
+ConstString ValueObjectDynamicValue::GetQualifiedTypeName() {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success) {
+    if (m_dynamic_type_info.HasName())
+      return m_dynamic_type_info.GetName();
+  }
+  return m_parent->GetQualifiedTypeName();
+}
+
+ConstString ValueObjectDynamicValue::GetDisplayTypeName() {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success) {
+    if (m_dynamic_type_info.HasType())
+      return GetCompilerType().GetDisplayTypeName();
+    if (m_dynamic_type_info.HasName())
+      return m_dynamic_type_info.GetName();
+  }
+  return m_parent->GetDisplayTypeName();
+}
+
+size_t ValueObjectDynamicValue::CalculateNumChildren(uint32_t max) {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success && m_dynamic_type_info.HasType()) {
+    ExecutionContext exe_ctx(GetExecutionContextRef());
+    auto children_count = GetCompilerType().GetNumChildren(true, &exe_ctx);
+    return children_count <= max ? children_count : max;
+  } else
+    return m_parent->GetNumChildren(max);
+}
+
+uint64_t ValueObjectDynamicValue::GetByteSize() {
+  const bool success = UpdateValueIfNeeded(false);
+  if (success && m_dynamic_type_info.HasType()) {
+    ExecutionContext exe_ctx(GetExecutionContextRef());
+    return m_value.GetValueByteSize(nullptr, &exe_ctx);
+  } else
+    return m_parent->GetByteSize();
+}
+
+lldb::ValueType ValueObjectDynamicValue::GetValueType() const {
+  return m_parent->GetValueType();
+}
+
+bool ValueObjectDynamicValue::UpdateValue() {
+  SetValueIsValid(false);
+  m_error.Clear();
+
+  if (!m_parent->UpdateValueIfNeeded(false)) {
+    // The dynamic value failed to get an error, pass the error along
+    if (m_error.Success() && m_parent->GetError().Fail())
+      m_error = m_parent->GetError();
+    return false;
+  }
+
+  // Setting our type_sp to NULL will route everything back through our parent
+  // which is equivalent to not using dynamic values.
+  if (m_use_dynamic == lldb::eNoDynamicValues) {
+    m_dynamic_type_info.Clear();
+    return true;
+  }
+
+  ExecutionContext exe_ctx(GetExecutionContextRef());
+  Target *target = exe_ctx.GetTargetPtr();
+  if (target) {
+    m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
+    m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
+  }
+
+  // First make sure our Type and/or Address haven't changed:
+  Process *process = exe_ctx.GetProcessPtr();
+  if (!process)
+    return false;
+
+  TypeAndOrName class_type_or_name;
+  Address dynamic_address;
+  bool found_dynamic_type = false;
+  Value::ValueType value_type;
+
+  LanguageRuntime *runtime = nullptr;
+
+  lldb::LanguageType known_type = m_parent->GetObjectRuntimeLanguage();
+  if (known_type != lldb::eLanguageTypeUnknown &&
+      known_type != lldb::eLanguageTypeC) {
+    runtime = process->GetLanguageRuntime(known_type);
+    if (runtime)
+      found_dynamic_type = runtime->GetDynamicTypeAndAddress(
+          *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
+          value_type);
+  } else {
+    runtime = process->GetLanguageRuntime(lldb::eLanguageTypeC_plus_plus);
+    if (runtime)
+      found_dynamic_type = runtime->GetDynamicTypeAndAddress(
+          *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
+          value_type);
+
+    if (!found_dynamic_type) {
+      runtime = process->GetLanguageRuntime(lldb::eLanguageTypeObjC);
+      if (runtime)
+        found_dynamic_type = runtime->GetDynamicTypeAndAddress(
+            *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
+            value_type);
+    }
+  }
+
+  // Getting the dynamic value may have run the program a bit, and so marked us
+  // as needing updating, but we really don't...
+
+  m_update_point.SetUpdated();
+
+  if (runtime && found_dynamic_type) {
+    if (class_type_or_name.HasType()) {
+      m_type_impl =
+          TypeImpl(m_parent->GetCompilerType(),
+                   runtime->FixUpDynamicType(class_type_or_name, *m_parent)
+                       .GetCompilerType());
+    } else {
+      m_type_impl.Clear();
+    }
+  } else {
+    m_type_impl.Clear();
+  }
+
+  // If we don't have a dynamic type, then make ourselves just a echo of our
+  // parent. Or we could return false, and make ourselves an echo of our
+  // parent?
+  if (!found_dynamic_type) {
+    if (m_dynamic_type_info)
+      SetValueDidChange(true);
+    ClearDynamicTypeInformation();
+    m_dynamic_type_info.Clear();
+    m_value = m_parent->GetValue();
+    m_error = m_value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
+    return m_error.Success();
+  }
+
+  Value old_value(m_value);
+
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_TYPES));
+
+  bool has_changed_type = false;
+
+  if (!m_dynamic_type_info) {
+    m_dynamic_type_info = class_type_or_name;
+    has_changed_type = true;
+  } else if (class_type_or_name != m_dynamic_type_info) {
+    // We are another type, we need to tear down our children...
+    m_dynamic_type_info = class_type_or_name;
+    SetValueDidChange(true);
+    has_changed_type = true;
+  }
+
+  if (has_changed_type)
+    ClearDynamicTypeInformation();
+
+  if (!m_address.IsValid() || m_address != dynamic_address) {
+    if (m_address.IsValid())
+      SetValueDidChange(true);
+
+    // We've moved, so we should be fine...
+    m_address = dynamic_address;
+    lldb::TargetSP target_sp(GetTargetSP());
+    lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
+    m_value.GetScalar() = load_address;
+  }
+
+  if (runtime)
+    m_dynamic_type_info =
+        runtime->FixUpDynamicType(m_dynamic_type_info, *m_parent);
+
+  // m_value.SetContext (Value::eContextTypeClangType, corrected_type);
+  m_value.SetCompilerType(m_dynamic_type_info.GetCompilerType());
+
+  m_value.SetValueType(value_type);
+
+  if (has_changed_type && log)
+    log->Printf("[%s %p] has a new dynamic type %s", GetName().GetCString(),
+                static_cast<void *>(this), GetTypeName().GetCString());
+
+  if (m_address.IsValid() && m_dynamic_type_info) {
+    // The variable value is in the Scalar value inside the m_value. We can
+    // point our m_data right to it.
+    m_error = m_value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
+    if (m_error.Success()) {
+      if (!CanProvideValue()) {
+        // this value object represents an aggregate type whose children have
+        // values, but this object does not. So we say we are changed if our
+        // location has changed.
+        SetValueDidChange(m_value.GetValueType() != old_value.GetValueType() ||
+                          m_value.GetScalar() != old_value.GetScalar());
+      }
+
+      SetValueIsValid(true);
+      return true;
+    }
+  }
+
+  // We get here if we've failed above...
+  SetValueIsValid(false);
+  return false;
+}
+
+bool ValueObjectDynamicValue::IsInScope() { return m_parent->IsInScope(); }
+
+bool ValueObjectDynamicValue::SetValueFromCString(const char *value_str,
+                                                  Status &error) {
+  if (!UpdateValueIfNeeded(false)) {
+    error.SetErrorString("unable to read value");
+    return false;
+  }
+
+  uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
+  uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
+
+  if (my_value == UINT64_MAX || parent_value == UINT64_MAX) {
+    error.SetErrorString("unable to read value");
+    return false;
+  }
+
+  // if we are at an offset from our parent, in order to set ourselves
+  // correctly we would need to change the new value so that it refers to the
+  // correct dynamic type. we choose not to deal with that - if anything more
+  // than a value overwrite is required, you should be using the expression
+  // parser instead of the value editing facility
+  if (my_value != parent_value) {
+    // but NULL'ing out a value should always be allowed
+    if (strcmp(value_str, "0")) {
+      error.SetErrorString(
+          "unable to modify dynamic value, use 'expression' command");
+      return false;
+    }
+  }
+
+  bool ret_val = m_parent->SetValueFromCString(value_str, error);
+  SetNeedsUpdate();
+  return ret_val;
+}
+
+bool ValueObjectDynamicValue::SetData(DataExtractor &data, Status &error) {
+  if (!UpdateValueIfNeeded(false)) {
+    error.SetErrorString("unable to read value");
+    return false;
+  }
+
+  uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
+  uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
+
+  if (my_value == UINT64_MAX || parent_value == UINT64_MAX) {
+    error.SetErrorString("unable to read value");
+    return false;
+  }
+
+  // if we are at an offset from our parent, in order to set ourselves
+  // correctly we would need to change the new value so that it refers to the
+  // correct dynamic type. we choose not to deal with that - if anything more
+  // than a value overwrite is required, you should be using the expression
+  // parser instead of the value editing facility
+  if (my_value != parent_value) {
+    // but NULL'ing out a value should always be allowed
+    lldb::offset_t offset = 0;
+
+    if (data.GetPointer(&offset) != 0) {
+      error.SetErrorString(
+          "unable to modify dynamic value, use 'expression' command");
+      return false;
+    }
+  }
+
+  bool ret_val = m_parent->SetData(data, error);
+  SetNeedsUpdate();
+  return ret_val;
+}
+
+void ValueObjectDynamicValue::SetPreferredDisplayLanguage(
+    lldb::LanguageType lang) {
+  this->ValueObject::SetPreferredDisplayLanguage(lang);
+  if (m_parent)
+    m_parent->SetPreferredDisplayLanguage(lang);
+}
+
+lldb::LanguageType ValueObjectDynamicValue::GetPreferredDisplayLanguage() {
+  if (m_preferred_display_language == lldb::eLanguageTypeUnknown) {
+    if (m_parent)
+      return m_parent->GetPreferredDisplayLanguage();
+    return lldb::eLanguageTypeUnknown;
+  } else
+    return m_preferred_display_language;
+}
+
+bool ValueObjectDynamicValue::IsSyntheticChildrenGenerated() {
+  if (m_parent)
+    return m_parent->IsSyntheticChildrenGenerated();
+  return false;
+}
+
+void ValueObjectDynamicValue::SetSyntheticChildrenGenerated(bool b) {
+  if (m_parent)
+    m_parent->SetSyntheticChildrenGenerated(b);
+  this->ValueObject::SetSyntheticChildrenGenerated(b);
+}
+
+bool ValueObjectDynamicValue::GetDeclaration(Declaration &decl) {
+  if (m_parent)
+    return m_parent->GetDeclaration(decl);
+
+  return ValueObject::GetDeclaration(decl);
+}
+
+uint64_t ValueObjectDynamicValue::GetLanguageFlags() {
+  if (m_parent)
+    return m_parent->GetLanguageFlags();
+  return this->ValueObject::GetLanguageFlags();
+}
+
+void ValueObjectDynamicValue::SetLanguageFlags(uint64_t flags) {
+  if (m_parent)
+    m_parent->SetLanguageFlags(flags);
+  else
+    this->ValueObject::SetLanguageFlags(flags);
+}