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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===-- LibCxxOptional.cpp --------------------------------------*- C++ -*-===//
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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 OptionalFrontEnd : public SyntheticChildrenFrontEnd {
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public:
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OptionalFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
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Update();
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}
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size_t GetIndexOfChildWithName(const ConstString &name) override {
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return formatters::ExtractIndexFromString(name.GetCString());
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}
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bool MightHaveChildren() override { return true; }
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bool Update() override;
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size_t CalculateNumChildren() override { return m_size; }
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ValueObjectSP GetChildAtIndex(size_t idx) override;
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private:
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size_t m_size = 0;
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ValueObjectSP m_base_sp;
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};
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} // namespace
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bool OptionalFrontEnd::Update() {
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ValueObjectSP engaged_sp(
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m_backend.GetChildMemberWithName(ConstString("__engaged_"), true));
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if (!engaged_sp)
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return false;
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// __engaged_ is a bool flag and is true if the optional contains a value.
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// Converting it to unsigned gives us a size of 1 if it contains a value
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// and 0 if not.
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m_size = engaged_sp->GetValueAsUnsigned(0);
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return false;
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}
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ValueObjectSP OptionalFrontEnd::GetChildAtIndex(size_t idx) {
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if (idx >= m_size)
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return ValueObjectSP();
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// __val_ contains the underlying value of an optional if it has one.
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// Currently because it is part of an anonymous union GetChildMemberWithName()
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// does not peer through and find it unless we are at the parent itself.
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// We can obtain the parent through __engaged_.
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ValueObjectSP val_sp(
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m_backend.GetChildMemberWithName(ConstString("__engaged_"), true)
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->GetParent()
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->GetChildAtIndex(0, true)
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->GetChildMemberWithName(ConstString("__val_"), true));
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if (!val_sp)
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return ValueObjectSP();
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CompilerType holder_type = val_sp->GetCompilerType();
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if (!holder_type)
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return ValueObjectSP();
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return val_sp->Clone(ConstString(llvm::formatv("Value").str()));
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}
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SyntheticChildrenFrontEnd *
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formatters::LibcxxOptionalFrontEndCreator(CXXSyntheticChildren *,
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lldb::ValueObjectSP valobj_sp) {
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if (valobj_sp)
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return new OptionalFrontEnd(*valobj_sp);
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return nullptr;
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}
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