125 lines
4.1 KiB
C++
125 lines
4.1 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/DataFormatters/FormattersHelpers.h"
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#include "lldb/Utility/ConstString.h"
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#include "lldb/ValueObject/ValueObject.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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llvm::Expected<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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llvm::Expected<uint64_t> size_or_err = m_element_type.GetByteSize(nullptr);
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if (!size_or_err)
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LLDB_LOG_ERRORV(GetLog(LLDBLog::DataFormatters), size_or_err.takeError(),
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"{0}");
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else {
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m_element_size = *size_or_err;
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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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llvm::Expected<size_t>
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
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GetIndexOfChildWithName(ConstString name) {
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if (!m_start) {
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return llvm::createStringError("Type has no child named '%s'",
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name.AsCString());
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}
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auto optional_idx = formatters::ExtractIndexFromString(name.GetCString());
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if (!optional_idx) {
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return llvm::createStringError("Type has no child named '%s'",
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name.AsCString());
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}
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return *optional_idx;
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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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