f59056ff93
Summary: llvm::APSInt(0) asserts because it creates an int with bit-width 0 and not (as I thought) a value 0. Theoretically it should be sufficient to change this to APSInt(1), as the intention there was that the value of the first argument should be ignored if the type is invalid, but that would look dodgy. Instead, I use llvm::Optional to denote an invalid value and use a special struct instead of a std::pair, to reduce typing and increase clarity. Reviewers: clayborg Subscribers: lldb-commits Differential Revision: https://reviews.llvm.org/D40615 llvm-svn: 319414
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
//===-- LibCxxBitset.cpp ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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chunk = m_first->GetChildAtIndex(
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idx / type.GetBitSize(ctx.GetBestExecutionContextScope()), 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 ValueObjectSP();
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size_t chunk_idx = idx % type.GetBitSize(ctx.GetBestExecutionContextScope());
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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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