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

398 lines
12 KiB
C++

//===-- ValueObjectDynamicValue.cpp ---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/ValueObjectDynamicValue.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/Module.h"
#include "lldb/Core/ValueObjectList.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/Type.h"
#include "lldb/Symbol/Variable.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/LanguageRuntime.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
using namespace lldb_private;
lldb::ValueObjectSP
ValueObjectCast::Create (ValueObject &parent,
const ConstString &name,
const ClangASTType &cast_type)
{
ValueObjectCast *cast_valobj_ptr = new ValueObjectCast (parent, name, cast_type);
return cast_valobj_ptr->GetSP();
}
ValueObjectCast::ValueObjectCast
(
ValueObject &parent,
const ConstString &name,
const ClangASTType &cast_type
) :
ValueObject(parent),
m_cast_type (cast_type)
{
SetName (name);
m_value.SetContext (Value::eContextTypeClangType, cast_type.GetOpaqueQualType());
}
ValueObjectCast::~ValueObjectCast()
{
}
lldb::clang_type_t
ValueObjectCast::GetClangTypeImpl ()
{
return m_cast_type.GetOpaqueQualType();
}
uint32_t
ValueObjectCast::CalculateNumChildren()
{
return ClangASTContext::GetNumChildren (GetClangAST (), GetClangType(), true);
}
clang::ASTContext *
ValueObjectCast::GetClangASTImpl ()
{
return m_cast_type.GetASTContext();
}
size_t
ValueObjectCast::GetByteSize()
{
return m_value.GetValueByteSize(GetClangAST(), NULL);
}
lldb::ValueType
ValueObjectCast::GetValueType() const
{
// Let our parent answer global, local, argument, etc...
return m_parent->GetValueType();
}
bool
ValueObjectCast::UpdateValue ()
{
SetValueIsValid (false);
m_error.Clear();
if (m_parent->UpdateValueIfNeeded(false))
{
Value old_value(m_value);
m_update_point.SetUpdated();
m_value = m_parent->GetValue();
m_value.SetContext (Value::eContextTypeClangType, GetClangType());
SetAddressTypeOfChildren(m_parent->GetAddressTypeOfChildren());
if (ClangASTContext::IsAggregateType (GetClangType()))
{
// 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());
}
ExecutionContext exe_ctx (GetExecutionContextRef());
m_error = m_value.GetValueAsData(&exe_ctx, GetClangAST(), m_data, 0, GetModule().get());
SetValueDidChange (m_parent->GetValueDidChange());
return true;
}
// 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();
SetValueIsValid (false);
return false;
}
bool
ValueObjectCast::IsInScope ()
{
return m_parent->IsInScope();
}
//----------------------------------------------------------------------
ValueObjectDynamicValue::ValueObjectDynamicValue (ValueObject &parent, lldb::DynamicValueType use_dynamic) :
ValueObject(parent),
m_address (),
m_type_sp(),
m_use_dynamic (use_dynamic)
{
m_last_format_mgr_dynamic = use_dynamic;
SetName (parent.GetName());
}
ValueObjectDynamicValue::~ValueObjectDynamicValue()
{
m_owning_valobj_sp.reset();
}
lldb::clang_type_t
ValueObjectDynamicValue::GetClangTypeImpl ()
{
if (m_type_sp)
return m_value.GetClangType();
else
return m_parent->GetClangType();
}
ConstString
ValueObjectDynamicValue::GetTypeName()
{
const bool success = UpdateValueIfNeeded(false);
if (success && m_type_sp)
return ClangASTType::GetConstTypeName (GetClangAST(), GetClangType());
else
return m_parent->GetTypeName();
}
uint32_t
ValueObjectDynamicValue::CalculateNumChildren()
{
const bool success = UpdateValueIfNeeded(false);
if (success && m_type_sp)
return ClangASTContext::GetNumChildren (GetClangAST (), GetClangType(), true);
else
return m_parent->GetNumChildren();
}
clang::ASTContext *
ValueObjectDynamicValue::GetClangASTImpl ()
{
const bool success = UpdateValueIfNeeded(false);
if (success && m_type_sp)
return m_type_sp->GetClangAST();
else
return m_parent->GetClangAST ();
}
size_t
ValueObjectDynamicValue::GetByteSize()
{
const bool success = UpdateValueIfNeeded(false);
if (success && m_type_sp)
return m_value.GetValueByteSize(GetClangAST(), NULL);
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_type_sp.reset();
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;
lldb::LanguageType known_type = m_parent->GetObjectRuntimeLanguage();
if (known_type != lldb::eLanguageTypeUnknown && known_type != lldb::eLanguageTypeC)
{
LanguageRuntime *runtime = process->GetLanguageRuntime (known_type);
if (runtime)
found_dynamic_type = runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
}
else
{
LanguageRuntime *cpp_runtime = process->GetLanguageRuntime (lldb::eLanguageTypeC_plus_plus);
if (cpp_runtime)
found_dynamic_type = cpp_runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
if (!found_dynamic_type)
{
LanguageRuntime *objc_runtime = process->GetLanguageRuntime (lldb::eLanguageTypeObjC);
if (objc_runtime)
found_dynamic_type = objc_runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
}
}
lldb::TypeSP dynamic_type_sp = class_type_or_name.GetTypeSP();
// 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 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_type_sp)
SetValueDidChange(true);
m_value = m_parent->GetValue();
m_error = m_value.GetValueAsData (&exe_ctx, GetClangAST(), m_data, 0, GetModule().get());
return m_error.Success();
}
Value old_value(m_value);
if (!m_type_sp)
{
m_type_sp = dynamic_type_sp;
}
else if (dynamic_type_sp != m_type_sp)
{
// We are another type, we need to tear down our children...
m_type_sp = dynamic_type_sp;
SetValueDidChange (true);
}
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;
}
// The type will always be the type of the dynamic object. If our parent's type was a pointer,
// then our type should be a pointer to the type of the dynamic object. If a reference, then the original type
// should be okay...
lldb::clang_type_t orig_type = m_type_sp->GetClangForwardType();
lldb::clang_type_t corrected_type = orig_type;
if (m_parent->IsPointerType())
corrected_type = ClangASTContext::CreatePointerType (m_type_sp->GetClangAST(), orig_type);
else if (m_parent->IsPointerOrReferenceType())
corrected_type = ClangASTContext::CreateLValueReferenceType (m_type_sp->GetClangAST(), orig_type);
m_value.SetContext (Value::eContextTypeClangType, corrected_type);
// Our address is the location of the dynamic type stored in memory. It isn't a load address,
// because we aren't pointing to the LOCATION that stores the pointer to us, we're pointing to us...
m_value.SetValueType(Value::eValueTypeScalar);
if (m_address.IsValid() && m_type_sp)
{
// 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, GetClangAST(), m_data, 0, GetModule().get());
if (m_error.Success())
{
if (ClangASTContext::IsAggregateType (GetClangType()))
{
// 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, Error& 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;
}