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%" '{}' \;
```
146 lines
4.4 KiB
C++
146 lines
4.4 KiB
C++
//===-- LibCxxValarray.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/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 LibcxxStdValarraySyntheticFrontEnd : public SyntheticChildrenFrontEnd {
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public:
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LibcxxStdValarraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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~LibcxxStdValarraySyntheticFrontEnd() 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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/// A non-owning pointer to valarray's __begin_ member.
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ValueObject *m_start = nullptr;
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/// A non-owning pointer to valarray's __end_ member.
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ValueObject *m_finish = nullptr;
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/// The type of valarray's template argument T.
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CompilerType m_element_type;
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/// The sizeof valarray's template argument T.
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uint32_t m_element_size = 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::LibcxxStdValarraySyntheticFrontEnd::
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LibcxxStdValarraySyntheticFrontEnd(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::LibcxxStdValarraySyntheticFrontEnd::
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~LibcxxStdValarraySyntheticFrontEnd() {
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// these need to stay around because they are child objects who will follow
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// their parent's life cycle
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// delete m_start;
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// delete m_finish;
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}
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llvm::Expected<uint32_t> lldb_private::formatters::
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LibcxxStdValarraySyntheticFrontEnd::CalculateNumChildren() {
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if (!m_start || !m_finish)
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return 0;
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uint64_t start_val = m_start->GetValueAsUnsigned(0);
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uint64_t finish_val = m_finish->GetValueAsUnsigned(0);
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if (start_val == 0 || finish_val == 0)
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return 0;
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if (start_val >= finish_val)
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return 0;
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size_t num_children = (finish_val - start_val);
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if (num_children % m_element_size)
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return 0;
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return num_children / m_element_size;
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}
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lldb::ValueObjectSP
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lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::GetChildAtIndex(
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uint32_t idx) {
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if (!m_start || !m_finish)
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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::LibcxxStdValarraySyntheticFrontEnd::Update() {
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m_start = m_finish = nullptr;
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CompilerType type = m_backend.GetCompilerType();
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if (type.GetNumTemplateArguments() == 0)
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return ChildCacheState::eRefetch;
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m_element_type = type.GetTypeTemplateArgument(0);
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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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if (m_element_size == 0)
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return ChildCacheState::eRefetch;
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ValueObjectSP start = m_backend.GetChildMemberWithName("__begin_");
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ValueObjectSP finish = m_backend.GetChildMemberWithName("__end_");
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if (!start || !finish)
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return ChildCacheState::eRefetch;
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m_start = start.get();
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m_finish = finish.get();
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return ChildCacheState::eRefetch;
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}
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bool lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::
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MightHaveChildren() {
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return true;
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}
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size_t lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::
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GetIndexOfChildWithName(ConstString name) {
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if (!m_start || !m_finish)
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return std::numeric_limits<size_t>::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::LibcxxStdValarraySyntheticFrontEndCreator(
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CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
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if (!valobj_sp)
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return nullptr;
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return new LibcxxStdValarraySyntheticFrontEnd(valobj_sp);
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}
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