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).
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
//===-- LibCxxQueue.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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using namespace lldb;
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using namespace lldb_private;
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namespace {
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class QueueFrontEnd : public SyntheticChildrenFrontEnd {
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public:
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QueueFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
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Update();
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}
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llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
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if (m_container_sp)
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return m_container_sp->GetIndexOfChildWithName(name);
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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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lldb::ChildCacheState Update() override;
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llvm::Expected<uint32_t> CalculateNumChildren() override {
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return m_container_sp ? m_container_sp->GetNumChildren() : 0;
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}
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ValueObjectSP GetChildAtIndex(uint32_t idx) override {
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return m_container_sp ? m_container_sp->GetChildAtIndex(idx)
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: nullptr;
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}
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private:
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// The lifetime of a ValueObject and all its derivative ValueObjects
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// (children, clones, etc.) is managed by a ClusterManager. These
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// objects are only destroyed when every shared pointer to any of them
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// is destroyed, so we must not store a shared pointer to any ValueObject
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// derived from our backend ValueObject (since we're in the same cluster).
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ValueObject* m_container_sp = nullptr;
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};
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} // namespace
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lldb::ChildCacheState QueueFrontEnd::Update() {
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m_container_sp = nullptr;
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ValueObjectSP c_sp = m_backend.GetChildMemberWithName("c");
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if (!c_sp)
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return lldb::ChildCacheState::eRefetch;
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m_container_sp = c_sp->GetSyntheticValue().get();
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return lldb::ChildCacheState::eRefetch;
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}
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SyntheticChildrenFrontEnd *
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formatters::LibcxxQueueFrontEndCreator(CXXSyntheticChildren *,
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lldb::ValueObjectSP valobj_sp) {
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if (valobj_sp)
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return new QueueFrontEnd(*valobj_sp);
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return nullptr;
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}
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