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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
114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//===-- LibCxxBitset.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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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Target/Target.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 BitsetFrontEnd : public SyntheticChildrenFrontEnd {
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public:
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BitsetFrontEnd(ValueObject &valobj);
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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_elements.size(); }
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ValueObjectSP GetChildAtIndex(size_t idx) override;
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private:
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std::vector<ValueObjectSP> m_elements;
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ValueObjectSP m_first;
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CompilerType m_bool_type;
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ByteOrder m_byte_order = eByteOrderInvalid;
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uint8_t m_byte_size = 0;
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};
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} // namespace
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BitsetFrontEnd::BitsetFrontEnd(ValueObject &valobj)
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: SyntheticChildrenFrontEnd(valobj) {
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m_bool_type = valobj.GetCompilerType().GetBasicTypeFromAST(eBasicTypeBool);
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if (auto target_sp = m_backend.GetTargetSP()) {
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m_byte_order = target_sp->GetArchitecture().GetByteOrder();
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m_byte_size = target_sp->GetArchitecture().GetAddressByteSize();
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Update();
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}
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}
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bool BitsetFrontEnd::Update() {
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m_elements.clear();
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m_first.reset();
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TargetSP target_sp = m_backend.GetTargetSP();
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if (!target_sp)
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return false;
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size_t capping_size = target_sp->GetMaximumNumberOfChildrenToDisplay();
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size_t size = 0;
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if (auto arg = m_backend.GetCompilerType().GetIntegralTemplateArgument(0))
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size = arg->value.getLimitedValue(capping_size);
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m_elements.assign(size, ValueObjectSP());
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m_first = m_backend.GetChildMemberWithName(ConstString("__first_"), true);
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return false;
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}
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ValueObjectSP BitsetFrontEnd::GetChildAtIndex(size_t idx) {
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if (idx >= m_elements.size() || !m_first)
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return ValueObjectSP();
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if (m_elements[idx])
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return m_elements[idx];
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ExecutionContext ctx = m_backend.GetExecutionContextRef().Lock(false);
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CompilerType type;
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ValueObjectSP chunk;
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// For small bitsets __first_ is not an array, but a plain size_t.
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if (m_first->GetCompilerType().IsArrayType(&type, nullptr, nullptr)) {
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llvm::Optional<uint64_t> bit_size =
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type.GetBitSize(ctx.GetBestExecutionContextScope());
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if (!bit_size || *bit_size == 0)
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return {};
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chunk = m_first->GetChildAtIndex(idx / *bit_size, true);
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} else {
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type = m_first->GetCompilerType();
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chunk = m_first;
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}
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if (!type || !chunk)
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return {};
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llvm::Optional<uint64_t> bit_size =
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type.GetBitSize(ctx.GetBestExecutionContextScope());
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if (!bit_size || *bit_size == 0)
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return {};
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size_t chunk_idx = idx % *bit_size;
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uint8_t value = !!(chunk->GetValueAsUnsigned(0) & (uint64_t(1) << chunk_idx));
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DataExtractor data(&value, sizeof(value), m_byte_order, m_byte_size);
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m_elements[idx] = CreateValueObjectFromData(llvm::formatv("[{0}]", idx).str(),
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data, ctx, m_bool_type);
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return m_elements[idx];
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}
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SyntheticChildrenFrontEnd *formatters::LibcxxBitsetSyntheticFrontEndCreator(
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CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
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if (valobj_sp)
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return new BitsetFrontEnd(*valobj_sp);
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return nullptr;
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}
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