llvm-project/lldb/source/DataFormatters/NSArray.cpp

//===-- NSArray.cpp ---------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/lldb-python.h"

#include "lldb/DataFormatters/CXXFormatterFunctions.h"

#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Stream.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Host/Endian.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Target/ObjCLanguageRuntime.h"
#include "lldb/Target/Target.h"

using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;

bool
lldb_private::formatters::NSArraySummaryProvider (ValueObject& valobj, Stream& stream)
{
    ProcessSP process_sp = valobj.GetProcessSP();
    if (!process_sp)
        return false;
    
    ObjCLanguageRuntime* runtime = (ObjCLanguageRuntime*)process_sp->GetLanguageRuntime(lldb::eLanguageTypeObjC);
    
    if (!runtime)
        return false;
    
    ObjCLanguageRuntime::ClassDescriptorSP descriptor(runtime->GetClassDescriptor(valobj));
    
    if (!descriptor.get() || !descriptor->IsValid())
        return false;
    
    uint32_t ptr_size = process_sp->GetAddressByteSize();
    
    lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
    
    if (!valobj_addr)
        return false;
    
    uint64_t value = 0;
    
    const char* class_name = descriptor->GetClassName().GetCString();
    
    if (!class_name || !*class_name)
        return false;
    
    if (!strcmp(class_name,"__NSArrayI"))
    {
        Error error;
        value = process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + ptr_size, ptr_size, 0, error);
        if (error.Fail())
            return false;
    }
    else if (!strcmp(class_name,"__NSArrayM"))
    {
        Error error;
        value = process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + ptr_size, ptr_size, 0, error);
        if (error.Fail())
            return false;
    }
    else if (!strcmp(class_name,"__NSCFArray"))
    {
        Error error;
        value = process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + 2 * ptr_size, ptr_size, 0, error);
        if (error.Fail())
            return false;
    }
    else
    {
        if (!ExtractValueFromObjCExpression(valobj, "int", "count", value))
            return false;
    }
    
    stream.Printf("@\"%" PRIu64 " object%s\"",
                  value,
                  value == 1 ? "" : "s");
    return true;
}

lldb_private::formatters::NSArrayMSyntheticFrontEnd::NSArrayMSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
    SyntheticChildrenFrontEnd(*valobj_sp.get()),
    m_exe_ctx_ref(),
    m_ptr_size(8),
    m_data_32(NULL),
    m_data_64(NULL)
{
    if (valobj_sp)
    {
        clang::ASTContext *ast = valobj_sp->GetClangType().GetASTContext();
        if (ast)
            m_id_type = ClangASTType(ast, ast->ObjCBuiltinIdTy);
    }
}

size_t
lldb_private::formatters::NSArrayMSyntheticFrontEnd::CalculateNumChildren ()
{
    if (m_data_32)
        return m_data_32->_used;
    if (m_data_64)
        return m_data_64->_used;
    return 0;
}

lldb::ValueObjectSP
lldb_private::formatters::NSArrayMSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
    if (!m_data_32 && !m_data_64)
        return lldb::ValueObjectSP();
    if (idx >= CalculateNumChildren())
        return lldb::ValueObjectSP();
    lldb::addr_t object_at_idx = (m_data_32 ? m_data_32->_data : m_data_64->_data);
    size_t pyhs_idx = idx;
    pyhs_idx += (m_data_32 ? m_data_32->offset : m_data_64->offset);
    if ((m_data_32 ? m_data_32->_size : m_data_64->_size) <= pyhs_idx)
        pyhs_idx -= (m_data_32 ? m_data_32->_size : m_data_64->_size);
    object_at_idx += (pyhs_idx * m_ptr_size);
    StreamString idx_name;
    idx_name.Printf("[%zu]",idx);
    lldb::ValueObjectSP retval_sp = ValueObject::CreateValueObjectFromAddress(idx_name.GetData(),
                                                                              object_at_idx,
                                                                              m_exe_ctx_ref,
                                                                              m_id_type);
    m_children.push_back(retval_sp);
    return retval_sp;
}

bool
lldb_private::formatters::NSArrayMSyntheticFrontEnd::Update()
{
    m_children.clear();
    ValueObjectSP valobj_sp = m_backend.GetSP();
    m_ptr_size = 0;
    delete m_data_32;
    m_data_32 = NULL;
    delete m_data_64;
    m_data_64 = NULL;
    if (!valobj_sp)
        return false;
    m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
    Error error;
    error.Clear();
    lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
    if (!process_sp)
        return false;
    m_ptr_size = process_sp->GetAddressByteSize();
    uint64_t data_location = valobj_sp->GetValueAsUnsigned(0) + m_ptr_size;
    if (m_ptr_size == 4)
    {
        m_data_32 = new DataDescriptor_32();
        process_sp->ReadMemory (data_location, m_data_32, sizeof(DataDescriptor_32), error);
    }
    else
    {
        m_data_64 = new DataDescriptor_64();
        process_sp->ReadMemory (data_location, m_data_64, sizeof(DataDescriptor_64), error);
    }
    if (error.Fail())
        return false;
    return false;
}

bool
lldb_private::formatters::NSArrayMSyntheticFrontEnd::MightHaveChildren ()
{
    return true;
}

size_t
lldb_private::formatters::NSArrayMSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
    if (!m_data_32 && !m_data_64)
        return UINT32_MAX;
    const char* item_name = name.GetCString();
    uint32_t idx = ExtractIndexFromString(item_name);
    if (idx < UINT32_MAX && idx >= CalculateNumChildren())
        return UINT32_MAX;
    return idx;
}

lldb_private::formatters::NSArrayMSyntheticFrontEnd::~NSArrayMSyntheticFrontEnd ()
{
    delete m_data_32;
    m_data_32 = NULL;
    delete m_data_64;
    m_data_64 = NULL;
}

lldb_private::formatters::NSArrayISyntheticFrontEnd::NSArrayISyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
    SyntheticChildrenFrontEnd (*valobj_sp.get()),
    m_exe_ctx_ref (),
    m_ptr_size (8),
    m_items (0),
    m_data_ptr (0)
{
    if (valobj_sp)
    {
        clang::ASTContext *ast = valobj_sp->GetClangType().GetASTContext();
        if (ast)
            m_id_type = ClangASTType(ast, ast->ObjCBuiltinIdTy);
    }
}

lldb_private::formatters::NSArrayISyntheticFrontEnd::~NSArrayISyntheticFrontEnd ()
{
}

size_t
lldb_private::formatters::NSArrayISyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
    const char* item_name = name.GetCString();
    uint32_t idx = ExtractIndexFromString(item_name);
    if (idx < UINT32_MAX && idx >= CalculateNumChildren())
        return UINT32_MAX;
    return idx;
}

size_t
lldb_private::formatters::NSArrayISyntheticFrontEnd::CalculateNumChildren ()
{
    return m_items;
}

bool
lldb_private::formatters::NSArrayISyntheticFrontEnd::Update()
{
    m_ptr_size = 0;
    m_items = 0;
    m_data_ptr = 0;
    m_children.clear();
    ValueObjectSP valobj_sp = m_backend.GetSP();
    if (!valobj_sp)
        return false;
    m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
    Error error;
    error.Clear();
    lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
    if (!process_sp)
        return false;
    m_ptr_size = process_sp->GetAddressByteSize();
    uint64_t data_location = valobj_sp->GetValueAsUnsigned(0) + m_ptr_size;
    m_items = process_sp->ReadPointerFromMemory(data_location, error);
    if (error.Fail())
        return false;
    m_data_ptr = data_location+m_ptr_size;
    return false;
}

bool
lldb_private::formatters::NSArrayISyntheticFrontEnd::MightHaveChildren ()
{
    return true;
}

lldb::ValueObjectSP
lldb_private::formatters::NSArrayISyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
    if (idx >= CalculateNumChildren())
        return lldb::ValueObjectSP();
    lldb::addr_t object_at_idx = m_data_ptr;
    object_at_idx += (idx * m_ptr_size);
    ProcessSP process_sp = m_exe_ctx_ref.GetProcessSP();
    if (!process_sp)
        return lldb::ValueObjectSP();
    Error error;
    if (error.Fail())
        return lldb::ValueObjectSP();
    StreamString idx_name;
    idx_name.Printf("[%zu]",idx);
    lldb::ValueObjectSP retval_sp = ValueObject::CreateValueObjectFromAddress(idx_name.GetData(), object_at_idx, m_exe_ctx_ref, m_id_type);
    m_children.push_back(retval_sp);
    return retval_sp;
}

SyntheticChildrenFrontEnd* lldb_private::formatters::NSArraySyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
    lldb::ProcessSP process_sp (valobj_sp->GetProcessSP());
    if (!process_sp)
        return NULL;
    ObjCLanguageRuntime *runtime = (ObjCLanguageRuntime*)process_sp->GetLanguageRuntime(lldb::eLanguageTypeObjC);
    if (!runtime)
        return NULL;
    
    if (!valobj_sp->IsPointerType())
    {
        Error error;
        valobj_sp = valobj_sp->AddressOf(error);
        if (error.Fail() || !valobj_sp)
            return NULL;
    }
    
    ObjCLanguageRuntime::ClassDescriptorSP descriptor(runtime->GetClassDescriptor(*valobj_sp.get()));
    
    if (!descriptor.get() || !descriptor->IsValid())
        return NULL;
    
    const char* class_name = descriptor->GetClassName().GetCString();
    
    if (!class_name || !*class_name)
        return NULL;
    
    if (!strcmp(class_name,"__NSArrayI"))
    {
        return (new NSArrayISyntheticFrontEnd(valobj_sp));
    }
    else if (!strcmp(class_name,"__NSArrayM"))
    {
        return (new NSArrayMSyntheticFrontEnd(valobj_sp));
    }
    else
    {
        return (new NSArrayCodeRunningSyntheticFrontEnd(valobj_sp));
    }
}

lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::NSArrayCodeRunningSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
SyntheticChildrenFrontEnd(*valobj_sp.get())
{}

size_t
lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::CalculateNumChildren ()
{
    uint64_t count = 0;
    if (ExtractValueFromObjCExpression(m_backend, "int", "count", count))
        return count;
    return 0;
}

lldb::ValueObjectSP
lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
    StreamString idx_name;
    idx_name.Printf("[%zu]",idx);
    lldb::ValueObjectSP valobj_sp = CallSelectorOnObject(m_backend,"id","objectAtIndex:",idx);
    if (valobj_sp)
        valobj_sp->SetName(ConstString(idx_name.GetData()));
    return valobj_sp;
}

bool
lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::Update()
{
    return false;
}

bool
lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::MightHaveChildren ()
{
    return true;
}

size_t
lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
    return 0;
}

lldb_private::formatters::NSArrayCodeRunningSyntheticFrontEnd::~NSArrayCodeRunningSyntheticFrontEnd ()
{}