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

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//===-- LibCxx.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/Debugger.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::LibcxxSmartPointerSummaryProvider (ValueObject& valobj, Stream& stream)
{
ValueObjectSP valobj_sp(valobj.GetNonSyntheticValue());
if (!valobj_sp)
return false;
ValueObjectSP ptr_sp(valobj_sp->GetChildMemberWithName(ConstString("__ptr_"), true));
ValueObjectSP count_sp(valobj_sp->GetChildAtNamePath( {ConstString("__cntrl_"),ConstString("__shared_owners_")} ));
ValueObjectSP weakcount_sp(valobj_sp->GetChildAtNamePath( {ConstString("__cntrl_"),ConstString("__shared_weak_owners_")} ));
if (!ptr_sp)
return false;
if (ptr_sp->GetValueAsUnsigned(0) == 0)
{
stream.Printf("nullptr");
return true;
}
else
{
bool print_pointee = false;
Error error;
ValueObjectSP pointee_sp = ptr_sp->Dereference(error);
if (pointee_sp && error.Success())
{
if (pointee_sp->DumpPrintableRepresentation(stream,
ValueObject::eValueObjectRepresentationStyleSummary,
lldb::eFormatInvalid,
ValueObject::ePrintableRepresentationSpecialCasesDisable,
false))
print_pointee = true;
}
if (!print_pointee)
stream.Printf("ptr = 0x%" PRIx64, ptr_sp->GetValueAsUnsigned(0));
}
if (count_sp)
stream.Printf(" strong=%" PRIu64, 1+count_sp->GetValueAsUnsigned(0));
if (weakcount_sp)
stream.Printf(" weak=%" PRIu64, 1+weakcount_sp->GetValueAsUnsigned(0));
return true;
}
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::LibcxxVectorBoolSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
SyntheticChildrenFrontEnd(*valobj_sp.get()),
m_bool_type(),
m_exe_ctx_ref(),
m_count(0),
m_base_data_address(0),
m_children()
{
if (valobj_sp)
{
Update();
m_bool_type = valobj_sp->GetClangType().GetBasicTypeFromAST(lldb::eBasicTypeBool);
}
}
size_t
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::CalculateNumChildren ()
{
return m_count;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
auto iter = m_children.find(idx),
end = m_children.end();
if (iter != end)
return iter->second;
if (idx >= m_count)
return ValueObjectSP();
if (m_base_data_address == 0 || m_count == 0)
return ValueObjectSP();
if (!m_bool_type)
return ValueObjectSP();
size_t byte_idx = (idx >> 3); // divide by 8 to get byte index
size_t bit_index = (idx & 7); // efficient idx % 8 for bit index
lldb::addr_t byte_location = m_base_data_address + byte_idx;
ProcessSP process_sp(m_exe_ctx_ref.GetProcessSP());
if (!process_sp)
return ValueObjectSP();
uint8_t byte = 0;
uint8_t mask = 0;
Error err;
size_t bytes_read = process_sp->ReadMemory(byte_location, &byte, 1, err);
if (err.Fail() || bytes_read == 0)
return ValueObjectSP();
switch (bit_index)
{
case 0:
mask = 1; break;
case 1:
mask = 2; break;
case 2:
mask = 4; break;
case 3:
mask = 8; break;
case 4:
mask = 16; break;
case 5:
mask = 32; break;
case 6:
mask = 64; break;
case 7:
mask = 128; break;
default:
return ValueObjectSP();
}
bool bit_set = ((byte & mask) != 0);
ValueObjectSP retval_sp;
DataBufferSP buffer_sp(new DataBufferHeap(m_bool_type.GetByteSize(),0));
if (bit_set && buffer_sp && buffer_sp->GetBytes())
*(buffer_sp->GetBytes()) = 1; // regardless of endianness, anything non-zero is true
StreamString name; name.Printf("[%" PRIu64 "]", (uint64_t)idx);
if (retval_sp)
m_children[idx] = retval_sp;
return retval_sp;
}
/*(std::__1::vector<std::__1::allocator<bool> >) vBool = {
__begin_ = 0x00000001001000e0
__size_ = 56
__cap_alloc_ = {
std::__1::__libcpp_compressed_pair_imp<unsigned long, std::__1::allocator<unsigned long> > = {
__first_ = 1
}
}
}*/
bool
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::Update()
{
m_children.clear();
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return false;
if (!valobj_sp)
return false;
m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
ValueObjectSP size_sp(valobj_sp->GetChildMemberWithName(ConstString("__size_"), true));
if (!size_sp)
return false;
m_count = size_sp->GetValueAsUnsigned(0);
if (!m_count)
return true;
ValueObjectSP begin_sp(valobj_sp->GetChildMemberWithName(ConstString("__begin_"), true));
if (!begin_sp)
{
m_count = 0;
return false;
}
m_base_data_address = begin_sp->GetValueAsUnsigned(0);
if (!m_base_data_address)
{
m_count = 0;
return false;
}
return false;
}
bool
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::MightHaveChildren ()
{
return true;
}
size_t
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
if (!m_count || !m_base_data_address)
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::LibcxxVectorBoolSyntheticFrontEnd::~LibcxxVectorBoolSyntheticFrontEnd ()
{}
SyntheticChildrenFrontEnd*
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
if (!valobj_sp)
return NULL;
return (new LibcxxVectorBoolSyntheticFrontEnd(valobj_sp));
}
/*
(lldb) fr var ibeg --raw --ptr-depth 1
(std::__1::__map_iterator<std::__1::__tree_iterator<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, std::__1::__tree_node<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, void *> *, long> >) ibeg = {
__i_ = {
__ptr_ = 0x0000000100103870 {
std::__1::__tree_node_base<void *> = {
std::__1::__tree_end_node<std::__1::__tree_node_base<void *> *> = {
__left_ = 0x0000000000000000
}
__right_ = 0x0000000000000000
__parent_ = 0x00000001001038b0
__is_black_ = true
}
__value_ = {
first = 0
second = { std::string }
*/
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::LibCxxMapIteratorSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
SyntheticChildrenFrontEnd(*valobj_sp.get()),
m_pair_ptr()
{
if (valobj_sp)
Update();
}
bool
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::Update()
{
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return false;
TargetSP target_sp(valobj_sp->GetTargetSP());
if (!target_sp)
return false;
if (!valobj_sp)
return false;
// this must be a ValueObject* because it is a child of the ValueObject we are producing children for
// it if were a ValueObjectSP, we would end up with a loop (iterator -> synthetic -> child -> parent == iterator)
// and that would in turn leak memory by never allowing the ValueObjects to die and free their memory
m_pair_ptr = valobj_sp->GetValueForExpressionPath(".__i_.__ptr_->__value_",
NULL,
NULL,
NULL,
ValueObject::GetValueForExpressionPathOptions().DontCheckDotVsArrowSyntax().DontAllowSyntheticChildren(),
NULL).get();
return false;
}
size_t
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::CalculateNumChildren ()
{
return 2;
}
lldb::ValueObjectSP
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
if (!m_pair_ptr)
return lldb::ValueObjectSP();
return m_pair_ptr->GetChildAtIndex(idx, true);
}
bool
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::MightHaveChildren ()
{
return true;
}
size_t
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
if (name == ConstString("first"))
return 0;
if (name == ConstString("second"))
return 1;
return UINT32_MAX;
}
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::~LibCxxMapIteratorSyntheticFrontEnd ()
{
// this will be deleted when its parent dies (since it's a child object)
//delete m_pair_ptr;
}
SyntheticChildrenFrontEnd*
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
if (!valobj_sp)
return NULL;
return (new LibCxxMapIteratorSyntheticFrontEnd(valobj_sp));
}
/*
(lldb) fr var ibeg --raw --ptr-depth 1 -T
(std::__1::__wrap_iter<int *>) ibeg = {
(std::__1::__wrap_iter<int *>::iterator_type) __i = 0x00000001001037a0 {
(int) *__i = 1
}
}
*/
SyntheticChildrenFrontEnd*
lldb_private::formatters::LibCxxVectorIteratorSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
static ConstString g_item_name;
if (!g_item_name)
g_item_name.SetCString("__i");
if (!valobj_sp)
return NULL;
return (new VectorIteratorSyntheticFrontEnd(valobj_sp,g_item_name));
}
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::LibcxxSharedPtrSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
SyntheticChildrenFrontEnd(*valobj_sp.get()),
m_cntrl(NULL),
m_count_sp(),
m_weak_count_sp(),
m_ptr_size(0),
m_byte_order(lldb::eByteOrderInvalid)
{
if (valobj_sp)
Update();
}
size_t
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::CalculateNumChildren ()
{
return (m_cntrl ? 1 : 0);
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
if (!m_cntrl)
return lldb::ValueObjectSP();
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return lldb::ValueObjectSP();
if (idx == 0)
return valobj_sp->GetChildMemberWithName(ConstString("__ptr_"), true);
if (idx > 2)
return lldb::ValueObjectSP();
if (idx == 1)
{
if (!m_count_sp)
{
ValueObjectSP shared_owners_sp(m_cntrl->GetChildMemberWithName(ConstString("__shared_owners_"),true));
if (!shared_owners_sp)
return lldb::ValueObjectSP();
uint64_t count = 1 + shared_owners_sp->GetValueAsUnsigned(0);
DataExtractor data(&count, 8, m_byte_order, m_ptr_size);
m_count_sp = ValueObject::CreateValueObjectFromData("count", data, valobj_sp->GetExecutionContextRef(), shared_owners_sp->GetClangType());
}
return m_count_sp;
}
else /* if (idx == 2) */
{
if (!m_weak_count_sp)
{
ValueObjectSP shared_weak_owners_sp(m_cntrl->GetChildMemberWithName(ConstString("__shared_weak_owners_"),true));
if (!shared_weak_owners_sp)
return lldb::ValueObjectSP();
uint64_t count = 1 + shared_weak_owners_sp->GetValueAsUnsigned(0);
DataExtractor data(&count, 8, m_byte_order, m_ptr_size);
m_weak_count_sp = ValueObject::CreateValueObjectFromData("count", data, valobj_sp->GetExecutionContextRef(), shared_weak_owners_sp->GetClangType());
}
return m_weak_count_sp;
}
}
bool
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::Update()
{
m_count_sp.reset();
m_weak_count_sp.reset();
m_cntrl = NULL;
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return false;
TargetSP target_sp(valobj_sp->GetTargetSP());
if (!target_sp)
return false;
m_byte_order = target_sp->GetArchitecture().GetByteOrder();
m_ptr_size = target_sp->GetArchitecture().GetAddressByteSize();
lldb::ValueObjectSP cntrl_sp(valobj_sp->GetChildMemberWithName(ConstString("__cntrl_"),true));
m_cntrl = cntrl_sp.get(); // need to store the raw pointer to avoid a circular dependency
return false;
}
bool
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::MightHaveChildren ()
{
return true;
}
size_t
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
if (name == ConstString("__ptr_"))
return 0;
if (name == ConstString("count"))
return 1;
if (name == ConstString("weak_count"))
return 2;
return UINT32_MAX;
}
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::~LibcxxSharedPtrSyntheticFrontEnd ()
{}
SyntheticChildrenFrontEnd*
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
if (!valobj_sp)
return NULL;
return (new LibcxxSharedPtrSyntheticFrontEnd(valobj_sp));
}
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::LibcxxStdVectorSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
SyntheticChildrenFrontEnd(*valobj_sp.get()),
m_start(NULL),
m_finish(NULL),
m_element_type(),
m_element_size(0),
m_children()
{
if (valobj_sp)
Update();
}
size_t
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::CalculateNumChildren ()
{
if (!m_start || !m_finish)
return 0;
uint64_t start_val = m_start->GetValueAsUnsigned(0);
uint64_t finish_val = m_finish->GetValueAsUnsigned(0);
if (start_val == 0 || finish_val == 0)
return 0;
if (start_val >= finish_val)
return 0;
size_t num_children = (finish_val - start_val);
if (num_children % m_element_size)
return 0;
return num_children/m_element_size;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
if (!m_start || !m_finish)
return lldb::ValueObjectSP();
auto cached = m_children.find(idx);
if (cached != m_children.end())
return cached->second;
uint64_t offset = idx * m_element_size;
offset = offset + m_start->GetValueAsUnsigned(0);
StreamString name;
name.Printf("[%" PRIu64 "]", (uint64_t)idx);
ValueObjectSP child_sp = ValueObject::CreateValueObjectFromAddress(name.GetData(), offset, m_backend.GetExecutionContextRef(), m_element_type);
m_children[idx] = child_sp;
return child_sp;
}
bool
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::Update()
{
m_start = m_finish = NULL;
m_children.clear();
ValueObjectSP data_type_finder_sp(m_backend.GetChildMemberWithName(ConstString("__end_cap_"),true));
if (!data_type_finder_sp)
return false;
data_type_finder_sp = data_type_finder_sp->GetChildMemberWithName(ConstString("__first_"),true);
if (!data_type_finder_sp)
return false;
m_element_type = data_type_finder_sp->GetClangType().GetPointeeType();
m_element_size = m_element_type.GetByteSize();
if (m_element_size > 0)
{
// store raw pointers or end up with a circular dependency
m_start = m_backend.GetChildMemberWithName(ConstString("__begin_"),true).get();
m_finish = m_backend.GetChildMemberWithName(ConstString("__end_"),true).get();
}
return false;
}
bool
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::MightHaveChildren ()
{
return true;
}
size_t
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
if (!m_start || !m_finish)
return UINT32_MAX;
return ExtractIndexFromString(name.GetCString());
}
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::~LibcxxStdVectorSyntheticFrontEnd ()
{
// these need to stay around because they are child objects who will follow their parent's life cycle
// delete m_start;
// delete m_finish;
}
SyntheticChildrenFrontEnd*
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
if (!valobj_sp)
return NULL;
return (new LibcxxStdVectorSyntheticFrontEnd(valobj_sp));
}
bool
lldb_private::formatters::LibcxxContainerSummaryProvider (ValueObject& valobj, Stream& stream)
{
if (valobj.IsPointerType())
{
uint64_t value = valobj.GetValueAsUnsigned(0);
if (!value)
return false;
stream.Printf("0x%016" PRIx64 " ", value);
}
return Debugger::FormatPrompt("size=${svar%#}", NULL, NULL, NULL, stream, &valobj);
}
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