b852fb1ec5
ValueObject is part of lldbCore for historical reasons, but conceptually
it deserves to be its own library. This does introduce a (link-time) circular
dependency between lldbCore and lldbValueObject, which is unfortunate
but probably unavoidable because so many things in LLDB rely on
ValueObject. We already have cycles and these libraries are never built
as dylibs so while this doesn't improve the situation, it also doesn't
make things worse.
The header includes were updated with the following command:
```
find . -type f -exec sed -i.bak "s%include \"lldb/Core/ValueObject%include \"lldb/ValueObject/ValueObject%" '{}' \;
```
235 lines
9.0 KiB
C++
235 lines
9.0 KiB
C++
//===-- ValueObjectConstResultImpl.cpp ------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/ValueObject/ValueObjectConstResultImpl.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Symbol/CompilerType.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/Endian.h"
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#include "lldb/Utility/LLDBLog.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Scalar.h"
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#include "lldb/ValueObject/ValueObject.h"
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#include "lldb/ValueObject/ValueObjectConstResult.h"
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#include "lldb/ValueObject/ValueObjectConstResultCast.h"
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#include "lldb/ValueObject/ValueObjectConstResultChild.h"
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#include <string>
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namespace lldb_private {
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class DataExtractor;
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}
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namespace lldb_private {
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class Status;
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}
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using namespace lldb;
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using namespace lldb_private;
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ValueObjectConstResultImpl::ValueObjectConstResultImpl(
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ValueObject *valobj, lldb::addr_t live_address)
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: m_impl_backend(valobj), m_live_address(live_address),
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m_live_address_type(eAddressTypeLoad), m_address_of_backend() {}
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lldb::ValueObjectSP ValueObjectConstResultImpl::Dereference(Status &error) {
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if (m_impl_backend == nullptr)
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return lldb::ValueObjectSP();
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return m_impl_backend->ValueObject::Dereference(error);
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}
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ValueObject *ValueObjectConstResultImpl::CreateChildAtIndex(size_t idx) {
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if (m_impl_backend == nullptr)
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return nullptr;
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m_impl_backend->UpdateValueIfNeeded(false);
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bool omit_empty_base_classes = true;
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bool ignore_array_bounds = false;
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std::string child_name;
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uint32_t child_byte_size = 0;
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int32_t child_byte_offset = 0;
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uint32_t child_bitfield_bit_size = 0;
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uint32_t child_bitfield_bit_offset = 0;
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bool child_is_base_class = false;
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bool child_is_deref_of_parent = false;
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uint64_t language_flags;
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const bool transparent_pointers = true;
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CompilerType compiler_type = m_impl_backend->GetCompilerType();
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ExecutionContext exe_ctx(m_impl_backend->GetExecutionContextRef());
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auto child_compiler_type_or_err = compiler_type.GetChildCompilerTypeAtIndex(
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&exe_ctx, idx, transparent_pointers, omit_empty_base_classes,
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ignore_array_bounds, child_name, child_byte_size, child_byte_offset,
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child_bitfield_bit_size, child_bitfield_bit_offset, child_is_base_class,
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child_is_deref_of_parent, m_impl_backend, language_flags);
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// One might think we should check that the size of the children
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// is always strictly positive, hence we could avoid creating a
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// ValueObject if that's not the case, but it turns out there
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// are languages out there which allow zero-size types with
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// children (e.g. Swift).
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if (!child_compiler_type_or_err || !child_compiler_type_or_err->IsValid()) {
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LLDB_LOG_ERROR(GetLog(LLDBLog::Types),
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child_compiler_type_or_err.takeError(),
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"could not find child: {0}");
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return nullptr;
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}
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lldb::addr_t child_live_addr = LLDB_INVALID_ADDRESS;
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// Transfer the live address (with offset) to the child. But if
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// the parent is a pointer, the live address is where that pointer
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// value lives in memory, so the children live addresses aren't
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// offsets from that value, they are just other load addresses that
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// are recorded in the Value of the child ValueObjects.
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if (m_live_address != LLDB_INVALID_ADDRESS && !compiler_type.IsPointerType())
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child_live_addr = m_live_address + child_byte_offset;
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return new ValueObjectConstResultChild(
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*m_impl_backend, *child_compiler_type_or_err, ConstString(child_name),
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child_byte_size, child_byte_offset, child_bitfield_bit_size,
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child_bitfield_bit_offset, child_is_base_class, child_is_deref_of_parent,
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child_live_addr, language_flags);
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}
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ValueObject *
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ValueObjectConstResultImpl::CreateSyntheticArrayMember(size_t idx) {
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if (m_impl_backend == nullptr)
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return nullptr;
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m_impl_backend->UpdateValueIfNeeded(false);
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bool omit_empty_base_classes = true;
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bool ignore_array_bounds = true;
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std::string child_name;
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uint32_t child_byte_size = 0;
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int32_t child_byte_offset = 0;
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uint32_t child_bitfield_bit_size = 0;
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uint32_t child_bitfield_bit_offset = 0;
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bool child_is_base_class = false;
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bool child_is_deref_of_parent = false;
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uint64_t language_flags;
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const bool transparent_pointers = false;
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CompilerType compiler_type = m_impl_backend->GetCompilerType();
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ExecutionContext exe_ctx(m_impl_backend->GetExecutionContextRef());
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auto child_compiler_type_or_err = compiler_type.GetChildCompilerTypeAtIndex(
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&exe_ctx, 0, transparent_pointers, omit_empty_base_classes,
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ignore_array_bounds, child_name, child_byte_size, child_byte_offset,
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child_bitfield_bit_size, child_bitfield_bit_offset, child_is_base_class,
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child_is_deref_of_parent, m_impl_backend, language_flags);
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// One might think we should check that the size of the children
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// is always strictly positive, hence we could avoid creating a
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// ValueObject if that's not the case, but it turns out there
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// are languages out there which allow zero-size types with
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// children (e.g. Swift).
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if (!child_compiler_type_or_err || !child_compiler_type_or_err->IsValid()) {
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LLDB_LOG_ERROR(GetLog(LLDBLog::Types),
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child_compiler_type_or_err.takeError(),
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"could not find child: {0}");
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return nullptr;
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}
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child_byte_offset += child_byte_size * idx;
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lldb::addr_t child_live_addr = LLDB_INVALID_ADDRESS;
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// Transfer the live address (with offset) to the child. But if
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// the parent is a pointer, the live address is where that pointer
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// value lives in memory, so the children live addresses aren't
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// offsets from that value, they are just other load addresses that
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// are recorded in the Value of the child ValueObjects.
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if (m_live_address != LLDB_INVALID_ADDRESS && !compiler_type.IsPointerType())
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child_live_addr = m_live_address + child_byte_offset;
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return new ValueObjectConstResultChild(
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*m_impl_backend, *child_compiler_type_or_err, ConstString(child_name),
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child_byte_size, child_byte_offset, child_bitfield_bit_size,
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child_bitfield_bit_offset, child_is_base_class, child_is_deref_of_parent,
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child_live_addr, language_flags);
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}
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lldb::ValueObjectSP ValueObjectConstResultImpl::GetSyntheticChildAtOffset(
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uint32_t offset, const CompilerType &type, bool can_create,
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ConstString name_const_str) {
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if (m_impl_backend == nullptr)
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return lldb::ValueObjectSP();
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return m_impl_backend->ValueObject::GetSyntheticChildAtOffset(
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offset, type, can_create, name_const_str);
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}
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lldb::ValueObjectSP ValueObjectConstResultImpl::AddressOf(Status &error) {
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if (m_address_of_backend.get() != nullptr)
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return m_address_of_backend;
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if (m_impl_backend == nullptr)
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return lldb::ValueObjectSP();
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if (m_live_address != LLDB_INVALID_ADDRESS) {
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CompilerType compiler_type(m_impl_backend->GetCompilerType());
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lldb::DataBufferSP buffer(new lldb_private::DataBufferHeap(
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&m_live_address, sizeof(lldb::addr_t)));
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std::string new_name("&");
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new_name.append(m_impl_backend->GetName().AsCString(""));
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ExecutionContext exe_ctx(m_impl_backend->GetExecutionContextRef());
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m_address_of_backend = ValueObjectConstResult::Create(
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exe_ctx.GetBestExecutionContextScope(), compiler_type.GetPointerType(),
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ConstString(new_name.c_str()), buffer, endian::InlHostByteOrder(),
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exe_ctx.GetAddressByteSize());
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m_address_of_backend->GetValue().SetValueType(Value::ValueType::Scalar);
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m_address_of_backend->GetValue().GetScalar() = m_live_address;
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return m_address_of_backend;
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} else
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return m_impl_backend->ValueObject::AddressOf(error);
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}
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lldb::ValueObjectSP
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ValueObjectConstResultImpl::Cast(const CompilerType &compiler_type) {
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if (m_impl_backend == nullptr)
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return lldb::ValueObjectSP();
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ValueObjectConstResultCast *result_cast =
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new ValueObjectConstResultCast(*m_impl_backend, m_impl_backend->GetName(),
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compiler_type, m_live_address);
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return result_cast->GetSP();
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}
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lldb::addr_t
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ValueObjectConstResultImpl::GetAddressOf(bool scalar_is_load_address,
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AddressType *address_type) {
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if (m_impl_backend == nullptr)
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return 0;
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if (m_live_address == LLDB_INVALID_ADDRESS) {
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return m_impl_backend->ValueObject::GetAddressOf(scalar_is_load_address,
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address_type);
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}
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if (address_type)
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*address_type = m_live_address_type;
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return m_live_address;
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}
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size_t ValueObjectConstResultImpl::GetPointeeData(DataExtractor &data,
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uint32_t item_idx,
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uint32_t item_count) {
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if (m_impl_backend == nullptr)
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return 0;
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return m_impl_backend->ValueObject::GetPointeeData(data, item_idx,
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item_count);
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}
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