624ea68cbc
Change GetNumChildren()/CalculateNumChildren() methods return llvm::Expected This is an NFC change that does not yet add any error handling or change any code to return any errors. This is the second big change in the patch series started with https://github.com/llvm/llvm-project/pull/83501 A follow-up PR will wire up error handling.
152 lines
4.4 KiB
C++
152 lines
4.4 KiB
C++
//===-- LibCxxAtomic.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 "LibCxxAtomic.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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using namespace lldb_private::formatters;
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//
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// We are supporting two versions of libc++ std::atomic
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//
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// Given std::atomic<int> i;
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//
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// The previous version of std::atomic was laid out like this
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//
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// (lldb) frame var -L -R i
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// 0x00007ffeefbff9a0: (std::__1::atomic<int>) i = {
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// 0x00007ffeefbff9a0: std::__1::__atomic_base<int, true> = {
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// 0x00007ffeefbff9a0: std::__1::__atomic_base<int, false> = {
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// 0x00007ffeefbff9a0: __a_ = 5
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// }
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// }
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// }
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//
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// In this case we need to obtain __a_ and the current version is laid out as so
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//
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// (lldb) frame var -L -R i
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// 0x00007ffeefbff9b0: (std::__1::atomic<int>) i = {
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// 0x00007ffeefbff9b0: std::__1::__atomic_base<int, true> = {
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// 0x00007ffeefbff9b0: std::__1::__atomic_base<int, false> = {
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// 0x00007ffeefbff9b0: __a_ = {
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// 0x00007ffeefbff9b0: std::__1::__cxx_atomic_base_impl<int> = {
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// 0x00007ffeefbff9b0: __a_value = 5
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// }
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// }
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// }
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// }
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//}
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//
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// In this case we need to obtain __a_value
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//
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// The below method covers both cases and returns the relevant member as a
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// ValueObjectSP
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//
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ValueObjectSP
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lldb_private::formatters::GetLibCxxAtomicValue(ValueObject &valobj) {
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ValueObjectSP non_sythetic = valobj.GetNonSyntheticValue();
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if (!non_sythetic)
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return {};
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ValueObjectSP member__a_ = non_sythetic->GetChildMemberWithName("__a_");
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if (!member__a_)
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return {};
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ValueObjectSP member__a_value =
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member__a_->GetChildMemberWithName("__a_value");
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if (!member__a_value)
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return member__a_;
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return member__a_value;
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}
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bool lldb_private::formatters::LibCxxAtomicSummaryProvider(
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ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
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if (ValueObjectSP atomic_value = GetLibCxxAtomicValue(valobj)) {
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std::string summary;
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if (atomic_value->GetSummaryAsCString(summary, options) &&
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summary.size() > 0) {
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stream.Printf("%s", summary.c_str());
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return true;
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}
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}
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return false;
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}
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namespace lldb_private {
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namespace formatters {
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class LibcxxStdAtomicSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
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public:
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LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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~LibcxxStdAtomicSyntheticFrontEnd() override = default;
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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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ValueObject *m_real_child = nullptr;
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};
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} // namespace formatters
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} // namespace lldb_private
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lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
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LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
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: SyntheticChildrenFrontEnd(*valobj_sp) {}
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lldb::ChildCacheState
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lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::Update() {
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ValueObjectSP atomic_value = GetLibCxxAtomicValue(m_backend);
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if (atomic_value)
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m_real_child = GetLibCxxAtomicValue(m_backend).get();
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return lldb::ChildCacheState::eRefetch;
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}
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bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
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MightHaveChildren() {
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return true;
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}
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llvm::Expected<uint32_t> lldb_private::formatters::
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LibcxxStdAtomicSyntheticFrontEnd::CalculateNumChildren() {
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return m_real_child ? 1 : 0;
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}
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lldb::ValueObjectSP
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lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::GetChildAtIndex(
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uint32_t idx) {
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if (idx == 0)
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return m_real_child->GetSP()->Clone(ConstString("Value"));
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return nullptr;
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}
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size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
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GetIndexOfChildWithName(ConstString name) {
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return name == "Value" ? 0 : UINT32_MAX;
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}
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SyntheticChildrenFrontEnd *
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lldb_private::formatters::LibcxxAtomicSyntheticFrontEndCreator(
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CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
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if (valobj_sp)
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return new LibcxxStdAtomicSyntheticFrontEnd(valobj_sp);
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return nullptr;
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}
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