llvm-project/lldb/source/Core/ValueObjectDynamicValue.cpp

385 lines
12 KiB
C++

//===-- ValueObjectDynamicValue.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/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 <cstring>
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());
}
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);
}
llvm::Optional<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, 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.SetCompilerType(m_dynamic_type_info.GetCompilerType());
m_value.SetValueType(value_type);
if (has_changed_type && log)
LLDB_LOGF(log, "[%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, 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.GetAddress(&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);
}