6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
//===-- ValueObjectVTable.h -------------------------------------*- 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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#ifndef LLDB_CORE_VALUEOBJECTVTABLE_H
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#define LLDB_CORE_VALUEOBJECTVTABLE_H
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#include "lldb/Core/ValueObject.h"
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namespace lldb_private {
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/// A class that represents a virtual function table for a C++ class.
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///
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/// ValueObject::GetError() will be in the success state if this value
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/// represents a C++ class with a vtable, or an appropriate error describing
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/// that the object isn't a C++ class with a vtable or not a C++ class.
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///
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/// ValueObject::GetName() will be the demangled symbol name for the virtual
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/// function table like "vtable for <classname>".
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///
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/// ValueObject::GetValueAsCString() will be the address of the first vtable
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/// entry if the current ValueObject is a class with a vtable, or nothing the
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/// current ValueObject is not a C++ class or not a C++ class that has a
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/// vtable.
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///
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/// ValueObject::GetValueAtUnsigned(...) will return the address of the first
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/// vtable entry.
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///
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/// ValueObject::GetAddressOf() will return the address of the vtable pointer
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/// found in the parent ValueObject.
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///
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/// ValueObject::GetNumChildren() will return the number of virtual function
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/// pointers in the vtable, or zero on error.
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///
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/// ValueObject::GetChildAtIndex(...) will return each virtual function pointer
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/// as a ValueObject object.
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///
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/// The child ValueObjects will have the following values:
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///
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/// ValueObject::GetError() will indicate success if the vtable entry was
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/// successfully read from memory, or an error if not.
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///
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/// ValueObject::GetName() will be the vtable function index in the form "[%u]"
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/// where %u is the index.
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///
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/// ValueObject::GetValueAsCString() will be the virtual function pointer value
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///
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/// ValueObject::GetValueAtUnsigned(...) will return the virtual function
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/// pointer value.
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///
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/// ValueObject::GetAddressOf() will return the address of the virtual function
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/// pointer.
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///
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/// ValueObject::GetNumChildren() returns 0
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class ValueObjectVTable : public ValueObject {
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public:
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~ValueObjectVTable() override;
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static lldb::ValueObjectSP Create(ValueObject &parent);
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std::optional<uint64_t> GetByteSize() override;
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llvm::Expected<uint32_t> CalculateNumChildren(uint32_t max) override;
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lldb::ValueType GetValueType() const override;
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ConstString GetTypeName() override;
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ConstString GetQualifiedTypeName() override;
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ConstString GetDisplayTypeName() override;
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bool IsInScope() override;
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protected:
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bool UpdateValue() override;
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CompilerType GetCompilerTypeImpl() override;
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/// The symbol for the C++ virtual function table.
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const Symbol *m_vtable_symbol = nullptr;
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/// Cache the number of vtable children when we update the value.
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uint32_t m_num_vtable_entries = 0;
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/// Cache the address size in bytes to avoid checking with the process to
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/// many times.
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uint32_t m_addr_size = 0;
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private:
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ValueObjectVTable(ValueObject &parent);
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ValueObject *CreateChildAtIndex(size_t idx) override;
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ValueObject *CreateSyntheticArrayMember(size_t idx) override {
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return nullptr;
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}
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// For ValueObject only
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ValueObjectVTable(const ValueObjectVTable &) = delete;
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const ValueObjectVTable &operator=(const ValueObjectVTable &) = delete;
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};
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} // namespace lldb_private
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#endif // LLDB_CORE_VALUEOBJECTVTABLE_H
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