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//===-- BlockPointer.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 "BlockPointer.h"
#include "Plugins/ExpressionParser/Clang/ClangASTImporter.h"
#include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Symbol/TypeSystem.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/Utility/Log.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private {
namespace formatters {
class BlockPointerSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
BlockPointerSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_block_struct_type() {
CompilerType block_pointer_type(m_backend.GetCompilerType());
CompilerType function_pointer_type;
block_pointer_type.IsBlockPointerType(&function_pointer_type);
TargetSP target_sp(m_backend.GetTargetSP());
if (!target_sp) {
return;
}
auto type_system_or_err = target_sp->GetScratchTypeSystemForLanguage(
lldb::eLanguageTypeC_plus_plus);
if (auto err = type_system_or_err.takeError()) {
LLDB_LOG_ERROR(
lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DATAFORMATTERS),
std::move(err), "Failed to get scratch TypeSystemClang");
return;
}
TypeSystemClang *clang_ast_context =
llvm::dyn_cast<TypeSystemClang>(&type_system_or_err.get());
if (!clang_ast_context) {
return;
}
std::shared_ptr<ClangASTImporter> clang_ast_importer;
auto *state = target_sp->GetPersistentExpressionStateForLanguage(
lldb::eLanguageTypeC_plus_plus);
if (state) {
auto *persistent_vars = llvm::cast<ClangPersistentVariables>(state);
clang_ast_importer = persistent_vars->GetClangASTImporter();
}
if (!clang_ast_importer) {
return;
}
const char *const isa_name("__isa");
const CompilerType isa_type =
clang_ast_context->GetBasicType(lldb::eBasicTypeObjCClass);
const char *const flags_name("__flags");
const CompilerType flags_type =
clang_ast_context->GetBasicType(lldb::eBasicTypeInt);
const char *const reserved_name("__reserved");
const CompilerType reserved_type =
clang_ast_context->GetBasicType(lldb::eBasicTypeInt);
const char *const FuncPtr_name("__FuncPtr");
const CompilerType FuncPtr_type =
clang_ast_importer->CopyType(*clang_ast_context, function_pointer_type);
m_block_struct_type = clang_ast_context->CreateStructForIdentifier(
ConstString(), {{isa_name, isa_type},
{flags_name, flags_type},
{reserved_name, reserved_type},
{FuncPtr_name, FuncPtr_type}});
}
~BlockPointerSyntheticFrontEnd() override = default;
size_t CalculateNumChildren() override {
const bool omit_empty_base_classes = false;
return m_block_struct_type.GetNumChildren(omit_empty_base_classes, nullptr);
}
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {
if (!m_block_struct_type.IsValid()) {
return lldb::ValueObjectSP();
}
if (idx >= CalculateNumChildren()) {
return lldb::ValueObjectSP();
}
const bool thread_and_frame_only_if_stopped = true;
ExecutionContext exe_ctx = m_backend.GetExecutionContextRef().Lock(
thread_and_frame_only_if_stopped);
const bool transparent_pointers = false;
const bool omit_empty_base_classes = false;
const bool ignore_array_bounds = false;
ValueObject *value_object = nullptr;
std::string child_name;
uint32_t child_byte_size = 0;
int32_t child_byte_offset = 0;
uint32_t child_bitfield_bit_size = 0;
uint32_t child_bitfield_bit_offset = 0;
bool child_is_base_class = false;
bool child_is_deref_of_parent = false;
uint64_t language_flags = 0;
const CompilerType child_type =
m_block_struct_type.GetChildCompilerTypeAtIndex(
&exe_ctx, idx, transparent_pointers, omit_empty_base_classes,
ignore_array_bounds, child_name, child_byte_size, child_byte_offset,
child_bitfield_bit_size, child_bitfield_bit_offset,
child_is_base_class, child_is_deref_of_parent, value_object,
language_flags);
ValueObjectSP struct_pointer_sp =
m_backend.Cast(m_block_struct_type.GetPointerType());
if (!struct_pointer_sp) {
return lldb::ValueObjectSP();
}
Status err;
ValueObjectSP struct_sp = struct_pointer_sp->Dereference(err);
if (!struct_sp || !err.Success()) {
return lldb::ValueObjectSP();
}
ValueObjectSP child_sp(struct_sp->GetSyntheticChildAtOffset(
child_byte_offset, child_type, true,
ConstString(child_name.c_str(), child_name.size())));
return child_sp;
}
// return true if this object is now safe to use forever without ever
// updating again; the typical (and tested) answer here is 'false'
bool Update() override { return false; }
// maybe return false if the block pointer is, say, null
bool MightHaveChildren() override { return true; }
size_t GetIndexOfChildWithName(ConstString name) override {
if (!m_block_struct_type.IsValid())
return UINT32_MAX;
const bool omit_empty_base_classes = false;
return m_block_struct_type.GetIndexOfChildWithName(name.AsCString(),
omit_empty_base_classes);
}
private:
CompilerType m_block_struct_type;
};
} // namespace formatters
} // namespace lldb_private
bool lldb_private::formatters::BlockPointerSummaryProvider(
ValueObject &valobj, Stream &s, const TypeSummaryOptions &) {
lldb_private::SyntheticChildrenFrontEnd *synthetic_children =
BlockPointerSyntheticFrontEndCreator(nullptr, valobj.GetSP());
if (!synthetic_children) {
return false;
}
synthetic_children->Update();
static const ConstString s_FuncPtr_name("__FuncPtr");
lldb::ValueObjectSP child_sp = synthetic_children->GetChildAtIndex(
synthetic_children->GetIndexOfChildWithName(s_FuncPtr_name));
if (!child_sp) {
return false;
}
lldb::ValueObjectSP qualified_child_representation_sp =
child_sp->GetQualifiedRepresentationIfAvailable(
lldb::eDynamicDontRunTarget, true);
const char *child_value =
qualified_child_representation_sp->GetValueAsCString();
s.Printf("%s", child_value);
return true;
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::BlockPointerSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new BlockPointerSyntheticFrontEnd(valobj_sp);
}
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