b3d130279f
This patch replaces the use of `UINT32_MAX` as the error return value of `GetIndexOfChildWithName` with `llvm::Expected`. # Tasks to do in another PR 1. Replace `CalculateNumChildrenIgnoringErrors` with `CalculateNumChildren`. See [this comment](https://github.com/llvm/llvm-project/pull/136693#discussion_r2056319358). 2. Update `lldb_private::formatters::ExtractIndexFromString` to use `llvm::Expected`. See [this comment](https://github.com/llvm/llvm-project/pull/136693#discussion_r2054217536). 3. Create a new class which carries both user and internal errors. See [this comment](https://github.com/llvm/llvm-project/pull/136693#discussion_r2056439608).
87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
//===-- LibCxxRangesRefView.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 "llvm/ADT/APSInt.h"
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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 LibcxxStdRangesRefViewSyntheticFrontEnd
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: public SyntheticChildrenFrontEnd {
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public:
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LibcxxStdRangesRefViewSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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~LibcxxStdRangesRefViewSyntheticFrontEnd() override = default;
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llvm::Expected<uint32_t> CalculateNumChildren() override {
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// __range_ will be the sole child of this type
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return 1;
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}
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lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override {
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// Since we only have a single child, return it
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assert(idx == 0);
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return m_range_sp;
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}
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lldb::ChildCacheState Update() override;
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llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
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// We only have a single child
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return 0;
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}
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private:
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/// Pointer to the dereferenced __range_ member
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lldb::ValueObjectSP m_range_sp = nullptr;
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};
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lldb_private::formatters::LibcxxStdRangesRefViewSyntheticFrontEnd::
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LibcxxStdRangesRefViewSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
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: SyntheticChildrenFrontEnd(*valobj_sp) {
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if (valobj_sp)
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Update();
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}
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lldb::ChildCacheState
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lldb_private::formatters::LibcxxStdRangesRefViewSyntheticFrontEnd::Update() {
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ValueObjectSP range_ptr =
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GetChildMemberWithName(m_backend, {ConstString("__range_")});
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if (!range_ptr)
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return lldb::ChildCacheState::eRefetch;
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lldb_private::Status error;
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m_range_sp = range_ptr->Dereference(error);
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return error.Success() ? lldb::ChildCacheState::eReuse
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: lldb::ChildCacheState::eRefetch;
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}
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lldb_private::SyntheticChildrenFrontEnd *
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LibcxxStdRangesRefViewSyntheticFrontEndCreator(CXXSyntheticChildren *,
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lldb::ValueObjectSP valobj_sp) {
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if (!valobj_sp)
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return nullptr;
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CompilerType type = valobj_sp->GetCompilerType();
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if (!type.IsValid())
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return nullptr;
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return new LibcxxStdRangesRefViewSyntheticFrontEnd(valobj_sp);
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}
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} // namespace formatters
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} // namespace lldb_private
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