624ea68cbc
Change GetNumChildren()/CalculateNumChildren() methods return llvm::Expected This is an NFC change that does not yet add any error handling or change any code to return any errors. This is the second big change in the patch series started with https://github.com/llvm/llvm-project/pull/83501 A follow-up PR will wire up error handling.
120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
//===-- LibCxxInitializerList.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 "LibCxx.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/DataFormatters/FormattersHelpers.h"
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#include "lldb/Utility/ConstString.h"
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#include <optional>
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::formatters;
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namespace lldb_private {
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namespace formatters {
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class LibcxxInitializerListSyntheticFrontEnd
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: public SyntheticChildrenFrontEnd {
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public:
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LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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~LibcxxInitializerListSyntheticFrontEnd() override;
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llvm::Expected<uint32_t> CalculateNumChildren() override;
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lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
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lldb::ChildCacheState Update() override;
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bool MightHaveChildren() override;
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size_t GetIndexOfChildWithName(ConstString name) override;
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private:
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ValueObject *m_start = nullptr;
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CompilerType m_element_type;
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uint32_t m_element_size = 0;
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size_t m_num_elements = 0;
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};
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} // namespace formatters
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} // namespace lldb_private
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
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LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
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: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
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if (valobj_sp)
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Update();
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}
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
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~LibcxxInitializerListSyntheticFrontEnd() {
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// this needs to stay around because it's a child object who will follow its
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// parent's life cycle
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// delete m_start;
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}
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llvm::Expected<uint32_t> lldb_private::formatters::
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LibcxxInitializerListSyntheticFrontEnd::CalculateNumChildren() {
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m_num_elements = 0;
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ValueObjectSP size_sp(m_backend.GetChildMemberWithName("__size_"));
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if (size_sp)
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m_num_elements = size_sp->GetValueAsUnsigned(0);
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return m_num_elements;
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}
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lldb::ValueObjectSP lldb_private::formatters::
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LibcxxInitializerListSyntheticFrontEnd::GetChildAtIndex(uint32_t idx) {
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if (!m_start)
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return lldb::ValueObjectSP();
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uint64_t offset = idx * m_element_size;
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offset = offset + m_start->GetValueAsUnsigned(0);
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StreamString name;
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name.Printf("[%" PRIu64 "]", (uint64_t)idx);
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return CreateValueObjectFromAddress(name.GetString(), offset,
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m_backend.GetExecutionContextRef(),
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m_element_type);
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}
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lldb::ChildCacheState
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::Update() {
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m_start = nullptr;
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m_num_elements = 0;
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m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
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if (!m_element_type.IsValid())
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return lldb::ChildCacheState::eRefetch;
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if (std::optional<uint64_t> size = m_element_type.GetByteSize(nullptr)) {
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m_element_size = *size;
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// Store raw pointers or end up with a circular dependency.
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m_start = m_backend.GetChildMemberWithName("__begin_").get();
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}
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return lldb::ChildCacheState::eRefetch;
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}
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bool lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
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MightHaveChildren() {
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return true;
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}
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size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
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GetIndexOfChildWithName(ConstString name) {
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if (!m_start)
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return UINT32_MAX;
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return ExtractIndexFromString(name.GetCString());
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}
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lldb_private::SyntheticChildrenFrontEnd *
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEndCreator(
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CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
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return (valobj_sp ? new LibcxxInitializerListSyntheticFrontEnd(valobj_sp)
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: nullptr);
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}
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