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https://github.com/capstone-engine/llvm-capstone.git
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1cd5e921e1
This is necessary because the byte size of an ObjC class type is not reliably statically knowable (e.g. because superclasses sit deep in frameworks that we have no debug info for) The lack of reliable size info is a problem when trying to freeze-dry an ObjC instance (not the pointer, the pointee) This commit lays the foundation for having language runtimes help in figuring out byte sizes, and having ClangASTType ask for runtime help No feature change as no runtime actually implements the logic, and nowhere is an ExecutionContext passed in yet llvm-svn: 227274
146 lines
4.3 KiB
C++
146 lines
4.3 KiB
C++
//===-- LibCxxInitializerList.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 "lldb/lldb-python.h"
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#include "lldb/DataFormatters/CXXFormatterFunctions.h"
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#include "lldb/Core/ConstString.h"
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#include "lldb/Core/ValueObject.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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namespace lldb_private {
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namespace formatters {
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class LibcxxInitializerListSyntheticFrontEnd : public SyntheticChildrenFrontEnd
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{
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public:
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LibcxxInitializerListSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp);
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virtual size_t
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CalculateNumChildren ();
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virtual lldb::ValueObjectSP
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GetChildAtIndex (size_t idx);
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virtual bool
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Update();
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virtual bool
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MightHaveChildren ();
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virtual size_t
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GetIndexOfChildWithName (const ConstString &name);
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virtual
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~LibcxxInitializerListSyntheticFrontEnd ();
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private:
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ValueObject* m_start;
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ClangASTType m_element_type;
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uint32_t m_element_size;
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size_t m_num_elements;
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std::map<size_t,lldb::ValueObjectSP> m_children;
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};
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}
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}
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::LibcxxInitializerListSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
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SyntheticChildrenFrontEnd(*valobj_sp.get()),
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m_start(NULL),
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m_element_type(),
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m_element_size(0),
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m_num_elements(0),
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m_children()
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{
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if (valobj_sp)
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Update();
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}
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size_t
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::CalculateNumChildren ()
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{
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static ConstString g___size_("__size_");
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m_num_elements = 0;
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ValueObjectSP size_sp(m_backend.GetChildMemberWithName(g___size_, true));
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if (size_sp)
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m_num_elements = size_sp->GetValueAsUnsigned(0);
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return m_num_elements;
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}
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lldb::ValueObjectSP
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::GetChildAtIndex (size_t idx)
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{
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if (!m_start)
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return lldb::ValueObjectSP();
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auto cached = m_children.find(idx);
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if (cached != m_children.end())
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return cached->second;
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uint64_t offset = idx * m_element_size;
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offset = offset + m_start->GetValueAsUnsigned(0);
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StreamString name;
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name.Printf("[%" PRIu64 "]", (uint64_t)idx);
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ValueObjectSP child_sp = CreateValueObjectFromAddress(name.GetData(), offset, m_backend.GetExecutionContextRef(), m_element_type);
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m_children[idx] = child_sp;
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return child_sp;
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}
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bool
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::Update()
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{
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static ConstString g___begin_("__begin_");
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m_start = nullptr;
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m_num_elements = 0;
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m_children.clear();
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lldb::TemplateArgumentKind kind;
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m_element_type = m_backend.GetClangType().GetTemplateArgument(0, kind);
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if (kind != lldb::eTemplateArgumentKindType || false == m_element_type.IsValid())
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return false;
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m_element_size = m_element_type.GetByteSize(nullptr);
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if (m_element_size > 0)
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m_start = m_backend.GetChildMemberWithName(g___begin_,true).get(); // store raw pointers or end up with a circular dependency
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return false;
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}
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bool
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::MightHaveChildren ()
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{
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return true;
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}
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size_t
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
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{
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if (!m_start)
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return UINT32_MAX;
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return ExtractIndexFromString(name.GetCString());
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}
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::~LibcxxInitializerListSyntheticFrontEnd ()
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{
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// this needs to stay around because it's a child object who will follow its parent's life cycle
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// delete m_start;
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}
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lldb_private::SyntheticChildrenFrontEnd*
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lldb_private::formatters::LibcxxInitializerListSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
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{
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if (!valobj_sp)
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return NULL;
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return (new LibcxxInitializerListSyntheticFrontEnd(valobj_sp));
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}
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