878a64f94a
This patch pushes the error handling boundary for the GetBitSize() methods from Runtime into the Type and CompilerType APIs. This makes it easier to diagnose problems thanks to more meaningful error messages being available. GetBitSize() is often the first thing LLDB asks about a type, so this method is particularly important for a better user experience. rdar://145667239
140 lines
4.3 KiB
C++
140 lines
4.3 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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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 =
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llvm::expectedToOptional(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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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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