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//===-- LibCxxUnorderedMap.cpp --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "LibCxx.h"
#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private {
namespace formatters {
class LibcxxStdUnorderedMapSyntheticFrontEnd
: public SyntheticChildrenFrontEnd {
public:
LibcxxStdUnorderedMapSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdUnorderedMapSyntheticFrontEnd() override = default;
size_t CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
bool Update() override;
bool MightHaveChildren() override;
size_t GetIndexOfChildWithName(ConstString name) override;
private:
CompilerType m_element_type;
CompilerType m_node_type;
ValueObject *m_tree;
size_t m_num_elements;
ValueObject *m_next_element;
std::vector<std::pair<ValueObject *, uint64_t>> m_elements_cache;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEnd::
LibcxxStdUnorderedMapSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type(), m_tree(nullptr),
m_num_elements(0), m_next_element(nullptr), m_elements_cache() {
if (valobj_sp)
Update();
}
size_t lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEnd::
CalculateNumChildren() {
if (m_num_elements != UINT32_MAX)
return m_num_elements;
return 0;
}
lldb::ValueObjectSP lldb_private::formatters::
LibcxxStdUnorderedMapSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
if (idx >= CalculateNumChildren())
return lldb::ValueObjectSP();
if (m_tree == nullptr)
return lldb::ValueObjectSP();
while (idx >= m_elements_cache.size()) {
if (m_next_element == nullptr)
return lldb::ValueObjectSP();
Status error;
ValueObjectSP node_sp = m_next_element->Dereference(error);
if (!node_sp || error.Fail())
return lldb::ValueObjectSP();
ValueObjectSP value_sp =
node_sp->GetChildMemberWithName(ConstString("__value_"), true);
ValueObjectSP hash_sp =
node_sp->GetChildMemberWithName(ConstString("__hash_"), true);
if (!hash_sp || !value_sp) {
if (!m_element_type) {
auto p1_sp = m_backend.GetChildAtNamePath({ConstString("__table_"),
ConstString("__p1_")});
if (!p1_sp)
return nullptr;
ValueObjectSP first_sp = nullptr;
switch (p1_sp->GetCompilerType().GetNumDirectBaseClasses()) {
case 1:
// Assume a pre llvm r300140 __compressed_pair implementation:
first_sp = p1_sp->GetChildMemberWithName(ConstString("__first_"),
true);
break;
case 2: {
// Assume a post llvm r300140 __compressed_pair implementation:
ValueObjectSP first_elem_parent_sp =
p1_sp->GetChildAtIndex(0, true);
first_sp = p1_sp->GetChildMemberWithName(ConstString("__value_"),
true);
break;
}
default:
return nullptr;
}
if (!first_sp)
return nullptr;
m_element_type = first_sp->GetCompilerType();
m_element_type = m_element_type.GetTypeTemplateArgument(0);
m_element_type = m_element_type.GetPointeeType();
m_node_type = m_element_type;
m_element_type = m_element_type.GetTypeTemplateArgument(0);
std::string name;
m_element_type =
m_element_type.GetFieldAtIndex(0, name, nullptr, nullptr, nullptr);
m_element_type = m_element_type.GetTypedefedType();
}
if (!m_node_type)
return nullptr;
node_sp = node_sp->Cast(m_node_type);
value_sp = node_sp->GetChildMemberWithName(ConstString("__value_"), true);
hash_sp = node_sp->GetChildMemberWithName(ConstString("__hash_"), true);
if (!value_sp || !hash_sp)
return nullptr;
}
m_elements_cache.push_back(
{value_sp.get(), hash_sp->GetValueAsUnsigned(0)});
m_next_element =
node_sp->GetChildMemberWithName(ConstString("__next_"), true).get();
if (!m_next_element || m_next_element->GetValueAsUnsigned(0) == 0)
m_next_element = nullptr;
}
std::pair<ValueObject *, uint64_t> val_hash = m_elements_cache[idx];
if (!val_hash.first)
return lldb::ValueObjectSP();
StreamString stream;
stream.Printf("[%" PRIu64 "]", (uint64_t)idx);
DataExtractor data;
Status error;
val_hash.first->GetData(data, error);
if (error.Fail())
return lldb::ValueObjectSP();
const bool thread_and_frame_only_if_stopped = true;
ExecutionContext exe_ctx = val_hash.first->GetExecutionContextRef().Lock(
thread_and_frame_only_if_stopped);
return CreateValueObjectFromData(stream.GetString(), data, exe_ctx,
val_hash.first->GetCompilerType());
}
bool lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEnd::
Update() {
m_num_elements = UINT32_MAX;
m_next_element = nullptr;
m_elements_cache.clear();
ValueObjectSP table_sp =
m_backend.GetChildMemberWithName(ConstString("__table_"), true);
if (!table_sp)
return false;
ValueObjectSP p2_sp = table_sp->GetChildMemberWithName(
ConstString("__p2_"), true);
ValueObjectSP num_elements_sp = nullptr;
llvm::SmallVector<ConstString, 3> next_path;
switch (p2_sp->GetCompilerType().GetNumDirectBaseClasses()) {
case 1:
// Assume a pre llvm r300140 __compressed_pair implementation:
num_elements_sp = p2_sp->GetChildMemberWithName(
ConstString("__first_"), true);
next_path.append({ConstString("__p1_"), ConstString("__first_"),
ConstString("__next_")});
break;
case 2: {
// Assume a post llvm r300140 __compressed_pair implementation:
ValueObjectSP first_elem_parent = p2_sp->GetChildAtIndex(0, true);
num_elements_sp = first_elem_parent->GetChildMemberWithName(
ConstString("__value_"), true);
next_path.append({ConstString("__p1_"), ConstString("__value_"),
ConstString("__next_")});
break;
}
default:
return false;
}
if (!num_elements_sp)
return false;
m_num_elements = num_elements_sp->GetValueAsUnsigned(0);
m_tree = table_sp->GetChildAtNamePath(next_path).get();
if (m_num_elements > 0)
m_next_element =
table_sp->GetChildAtNamePath(next_path).get();
return false;
}
bool lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
return ExtractIndexFromString(name.GetCString());
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibcxxStdUnorderedMapSyntheticFrontEnd(valobj_sp)
: nullptr);
}
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