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//===-- ValueObjectConstResultImpl.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/ValueObjectConstResultImpl.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Core/ValueObjectConstResultCast.h"
#include "lldb/Core/ValueObjectConstResultChild.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/Scalar.h"
#include <string>
namespace lldb_private {
class DataExtractor;
}
namespace lldb_private {
class Status;
}
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_address_of_backend() {}
lldb::ValueObjectSP ValueObjectConstResultImpl::Dereference(Status &error) {
if (m_impl_backend == nullptr)
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 == nullptr)
return nullptr;
m_impl_backend->UpdateValueIfNeeded(false);
ValueObjectConstResultChild *valobj = nullptr;
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;
uint64_t language_flags;
const bool transparent_pointers = !synthetic_array_member;
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, language_flags);
// One might think we should check that the size of the children
// is always strictly positive, hence we could avoid creating a
// ValueObject if that's not the case, but it turns out there
// are languages out there which allow zero-size types with
// children (e.g. Swift).
if (child_compiler_type) {
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());
lldb::addr_t child_live_addr = LLDB_INVALID_ADDRESS;
// Transfer the live address (with offset) to the child. But if
// the parent is a pointer, the live address is where that pointer
// value lives in memory, so the children live addresses aren't
// offsets from that value, they are just other load addresses that
// are recorded in the Value of the child ValueObjects.
if (m_live_address != LLDB_INVALID_ADDRESS) {
if (!compiler_type.IsPointerType())
child_live_addr = m_live_address + child_byte_offset;
}
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, child_live_addr,
language_flags);
}
return valobj;
}
lldb::ValueObjectSP ValueObjectConstResultImpl::GetSyntheticChildAtOffset(
uint32_t offset, const CompilerType &type, bool can_create,
ConstString name_const_str) {
if (m_impl_backend == nullptr)
return lldb::ValueObjectSP();
return m_impl_backend->ValueObject::GetSyntheticChildAtOffset(
offset, type, can_create, name_const_str);
}
lldb::ValueObjectSP ValueObjectConstResultImpl::AddressOf(Status &error) {
if (m_address_of_backend.get() != nullptr)
return m_address_of_backend;
if (m_impl_backend == nullptr)
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, endian::InlHostByteOrder(),
exe_ctx.GetAddressByteSize());
m_address_of_backend->GetValue().SetValueType(Value::ValueType::Scalar);
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 == nullptr)
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 == nullptr)
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 == nullptr)
return 0;
return m_impl_backend->ValueObject::GetPointeeData(data, item_idx,
item_count);
}
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