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

//===-- ValueObjectConstResultImpl.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/ValueObjectConstResultImpl.h"

#include "lldb/Core/ValueObjectChild.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Core/ValueObjectConstResultCast.h"
#include "lldb/Core/ValueObjectConstResultChild.h"
#include "lldb/Core/ValueObjectMemory.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ValueObjectList.h"

#include "lldb/Symbol/CompilerType.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/Process.h"
#include "lldb/Target/Target.h"

using namespace lldb;
using namespace lldb_private;

ValueObjectConstResultImpl::ValueObjectConstResultImpl (ValueObject* valobj,
                                                        lldb::addr_t live_address) :
    m_impl_backend(valobj),
    m_live_address(live_address),
    m_live_address_type(eAddressTypeLoad),
    m_load_addr_backend(),
    m_address_of_backend()
{
}

lldb::ValueObjectSP
ValueObjectConstResultImpl::Dereference (Error &error)
{
    if (m_impl_backend == NULL)
        return lldb::ValueObjectSP();
    
    return m_impl_backend->ValueObject::Dereference(error);
}

ValueObject *
ValueObjectConstResultImpl::CreateChildAtIndex (size_t idx, bool synthetic_array_member, int32_t synthetic_index)
{
    if (m_impl_backend == NULL)
        return NULL;

    m_impl_backend->UpdateValueIfNeeded(false);
    
    ValueObjectConstResultChild *valobj = NULL;
    
    bool omit_empty_base_classes = true;
    bool ignore_array_bounds = synthetic_array_member;
    std::string child_name_str;
    uint32_t child_byte_size = 0;
    int32_t child_byte_offset = 0;
    uint32_t child_bitfield_bit_size = 0;
    uint32_t child_bitfield_bit_offset = 0;
    bool child_is_base_class = false;
    bool child_is_deref_of_parent = false;
    
    const bool transparent_pointers = synthetic_array_member == false;
    CompilerType compiler_type = m_impl_backend->GetCompilerType();
    CompilerType child_compiler_type;
    
    ExecutionContext exe_ctx (m_impl_backend->GetExecutionContextRef());
    
    child_compiler_type = compiler_type.GetChildCompilerTypeAtIndex (&exe_ctx,
                                                                     idx,
                                                                     transparent_pointers,
                                                                     omit_empty_base_classes,
                                                                     ignore_array_bounds,
                                                                     child_name_str,
                                                                     child_byte_size,
                                                                     child_byte_offset,
                                                                     child_bitfield_bit_size,
                                                                     child_bitfield_bit_offset,
                                                                     child_is_base_class,
                                                                     child_is_deref_of_parent,
                                                                     m_impl_backend);
    if (child_compiler_type && child_byte_size)
    {
        if (synthetic_index)
            child_byte_offset += child_byte_size * synthetic_index;
        
        ConstString child_name;
        if (!child_name_str.empty())
            child_name.SetCString (child_name_str.c_str());

        valobj = new ValueObjectConstResultChild (*m_impl_backend,
                                                  child_compiler_type,
                                                  child_name,
                                                  child_byte_size,
                                                  child_byte_offset,
                                                  child_bitfield_bit_size,
                                                  child_bitfield_bit_offset,
                                                  child_is_base_class,
                                                  child_is_deref_of_parent,
                                                  m_live_address == LLDB_INVALID_ADDRESS ? m_live_address : m_live_address+child_byte_offset);
    }
    
    return valobj;
}

lldb::ValueObjectSP
ValueObjectConstResultImpl::GetSyntheticChildAtOffset (uint32_t offset, const CompilerType& type, bool can_create)
{
    if (m_impl_backend == NULL)
        return lldb::ValueObjectSP();

    return m_impl_backend->ValueObject::GetSyntheticChildAtOffset(offset, type, can_create);
}

lldb::ValueObjectSP
ValueObjectConstResultImpl::AddressOf (Error &error)
{
    if (m_address_of_backend.get() != NULL)
        return m_address_of_backend;
    
    if (m_impl_backend == NULL)
        return lldb::ValueObjectSP();
    if (m_live_address != LLDB_INVALID_ADDRESS)
    {
        CompilerType compiler_type(m_impl_backend->GetCompilerType());
        
        lldb::DataBufferSP buffer(new lldb_private::DataBufferHeap(&m_live_address,sizeof(lldb::addr_t)));
        
        std::string new_name("&");
        new_name.append(m_impl_backend->GetName().AsCString(""));
        ExecutionContext exe_ctx (m_impl_backend->GetExecutionContextRef());
        m_address_of_backend = ValueObjectConstResult::Create (exe_ctx.GetBestExecutionContextScope(),
                                                               compiler_type.GetPointerType(),
                                                               ConstString(new_name.c_str()),
                                                               buffer,
                                                               lldb::endian::InlHostByteOrder(), 
                                                               exe_ctx.GetAddressByteSize());
        
        m_address_of_backend->GetValue().SetValueType(Value::eValueTypeScalar);
        m_address_of_backend->GetValue().GetScalar() = m_live_address;
        
        return m_address_of_backend;
    }
    else
        return m_impl_backend->ValueObject::AddressOf(error);
}

lldb::ValueObjectSP
ValueObjectConstResultImpl::Cast (const CompilerType &compiler_type)
{
    if (m_impl_backend == NULL)
        return lldb::ValueObjectSP();

    ValueObjectConstResultCast *result_cast = new ValueObjectConstResultCast(
        *m_impl_backend, m_impl_backend->GetName(), compiler_type, m_live_address);
    return result_cast->GetSP();
}

lldb::addr_t
ValueObjectConstResultImpl::GetAddressOf (bool scalar_is_load_address,
                                          AddressType *address_type)
{
    
    if (m_impl_backend == NULL)
        return 0;
    
    if (m_live_address == LLDB_INVALID_ADDRESS)
    {
        return m_impl_backend->ValueObject::GetAddressOf (scalar_is_load_address,
                                                          address_type);
    }
    
    if (address_type)
        *address_type = m_live_address_type;
        
    return m_live_address;
}

size_t
ValueObjectConstResultImpl::GetPointeeData (DataExtractor& data,
                                            uint32_t item_idx,
                                            uint32_t item_count)
{
    if (m_impl_backend == NULL)
        return 0;
    return m_impl_backend->ValueObject::GetPointeeData(data, item_idx, item_count);
}