cc4d0146b4
internals. The first part of this is to use a new class: lldb_private::ExecutionContextRef This class holds onto weak pointers to the target, process, thread and frame and it also contains the thread ID and frame Stack ID in case the thread and frame objects go away and come back as new objects that represent the same logical thread/frame. ExecutionContextRef objcets have accessors to access shared pointers for the target, process, thread and frame which might return NULL if the backing object is no longer available. This allows for references to persistent program state without needing to hold a shared pointer to each object and potentially keeping that object around for longer than it needs to be. You can also "Lock" and ExecutionContextRef (which contains weak pointers) object into an ExecutionContext (which contains strong, or shared pointers) with code like ExecutionContext exe_ctx (my_obj->GetExectionContextRef().Lock()); llvm-svn: 150801
243 lines
9.8 KiB
C++
243 lines
9.8 KiB
C++
//===-- ValueObjectConstResultImpl.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/Core/ValueObjectConstResultImpl.h"
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#include "lldb/Core/ValueObjectChild.h"
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#include "lldb/Core/ValueObjectConstResult.h"
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#include "lldb/Core/ValueObjectConstResultChild.h"
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#include "lldb/Core/ValueObjectMemory.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ValueObjectList.h"
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#include "lldb/Symbol/ClangASTType.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Symbol/Type.h"
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#include "lldb/Symbol/Variable.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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using namespace lldb;
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using namespace lldb_private;
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// this macro enables a simpler implementation for some method calls in this object that relies only upon
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// ValueObject knowning how to set the address type of its children correctly. the alternative implementation
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// relies on being able to create a target copy of the frozen object, which makes it less bug-prone but less
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// efficient as well. once we are confident the faster implementation is bug-free, this macro (and the slower
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// implementations) can go
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#define TRIVIAL_IMPL 1
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ValueObjectConstResultImpl::ValueObjectConstResultImpl (ValueObject* valobj,
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lldb::addr_t live_address) :
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m_impl_backend(valobj),
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m_live_address(live_address),
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m_live_address_type(eAddressTypeLoad),
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m_load_addr_backend(),
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m_address_of_backend()
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{
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}
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lldb::ValueObjectSP
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ValueObjectConstResultImpl::DerefOnTarget()
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{
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if (m_load_addr_backend.get() == NULL)
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{
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lldb::addr_t tgt_address = m_impl_backend->GetPointerValue();
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ExecutionContext exe_ctx (m_impl_backend->GetExecutionContextRef());
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m_load_addr_backend = ValueObjectConstResult::Create (exe_ctx.GetBestExecutionContextScope(),
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m_impl_backend->GetClangAST(),
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m_impl_backend->GetClangType(),
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m_impl_backend->GetName(),
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tgt_address,
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eAddressTypeLoad,
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exe_ctx.GetAddressByteSize());
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}
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return m_load_addr_backend;
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}
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lldb::ValueObjectSP
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ValueObjectConstResultImpl::Dereference (Error &error)
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{
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if (m_impl_backend == NULL)
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return lldb::ValueObjectSP();
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#if defined (TRIVIAL_IMPL) && TRIVIAL_IMPL == 1
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return m_impl_backend->ValueObject::Dereference(error);
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#else
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m_impl_backend->UpdateValueIfNeeded(false);
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if (NeedsDerefOnTarget())
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return DerefOnTarget()->Dereference(error);
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else
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return m_impl_backend->ValueObject::Dereference(error);
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#endif
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}
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ValueObject *
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ValueObjectConstResultImpl::CreateChildAtIndex (uint32_t idx, bool synthetic_array_member, int32_t synthetic_index)
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{
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if (m_impl_backend == NULL)
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return NULL;
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m_impl_backend->UpdateValueIfNeeded(false);
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ValueObjectConstResultChild *valobj = NULL;
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bool omit_empty_base_classes = true;
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bool ignore_array_bounds = synthetic_array_member;
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std::string child_name_str;
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uint32_t child_byte_size = 0;
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int32_t child_byte_offset = 0;
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uint32_t child_bitfield_bit_size = 0;
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uint32_t child_bitfield_bit_offset = 0;
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bool child_is_base_class = false;
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bool child_is_deref_of_parent = false;
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const bool transparent_pointers = synthetic_array_member == false;
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clang::ASTContext *clang_ast = m_impl_backend->GetClangAST();
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lldb::clang_type_t clang_type = m_impl_backend->GetClangType();
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lldb::clang_type_t child_clang_type;
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ExecutionContext exe_ctx (m_impl_backend->GetExecutionContextRef());
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child_clang_type = ClangASTContext::GetChildClangTypeAtIndex (&exe_ctx,
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clang_ast,
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m_impl_backend->GetName().GetCString(),
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clang_type,
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idx,
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transparent_pointers,
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omit_empty_base_classes,
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ignore_array_bounds,
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child_name_str,
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child_byte_size,
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child_byte_offset,
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child_bitfield_bit_size,
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child_bitfield_bit_offset,
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child_is_base_class,
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child_is_deref_of_parent);
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if (child_clang_type && child_byte_size)
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{
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if (synthetic_index)
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child_byte_offset += child_byte_size * synthetic_index;
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ConstString child_name;
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if (!child_name_str.empty())
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child_name.SetCString (child_name_str.c_str());
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valobj = new ValueObjectConstResultChild (*m_impl_backend,
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clang_ast,
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child_clang_type,
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child_name,
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child_byte_size,
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child_byte_offset,
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child_bitfield_bit_size,
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child_bitfield_bit_offset,
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child_is_base_class,
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child_is_deref_of_parent);
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valobj->m_impl.SetLiveAddress(m_live_address+child_byte_offset);
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}
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return valobj;
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}
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lldb::ValueObjectSP
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ValueObjectConstResultImpl::GetSyntheticChildAtOffset (uint32_t offset, const ClangASTType& type, bool can_create)
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{
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if (m_impl_backend == NULL)
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return lldb::ValueObjectSP();
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#if defined (TRIVIAL_IMPL) && TRIVIAL_IMPL == 1
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return m_impl_backend->ValueObject::GetSyntheticChildAtOffset(offset, type, can_create);
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#else
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m_impl_backend->UpdateValueIfNeeded(false);
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if (NeedsDerefOnTarget())
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return DerefOnTarget()->GetSyntheticChildAtOffset(offset, type, can_create);
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else
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return m_impl_backend->ValueObject::GetSyntheticChildAtOffset(offset, type, can_create);
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#endif
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}
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lldb::ValueObjectSP
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ValueObjectConstResultImpl::AddressOf (Error &error)
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{
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if (m_address_of_backend.get() != NULL)
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return m_address_of_backend;
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if (m_impl_backend == NULL)
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return lldb::ValueObjectSP();
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if (m_live_address != LLDB_INVALID_ADDRESS)
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{
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ClangASTType type(m_impl_backend->GetClangAST(), m_impl_backend->GetClangType());
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lldb::DataBufferSP buffer(new lldb_private::DataBufferHeap(&m_live_address,sizeof(lldb::addr_t)));
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std::string new_name("&");
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new_name.append(m_impl_backend->GetName().AsCString(""));
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ExecutionContext exe_ctx (m_impl_backend->GetExecutionContextRef());
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m_address_of_backend = ValueObjectConstResult::Create (exe_ctx.GetBestExecutionContextScope(),
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type.GetASTContext(),
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type.GetPointerType(),
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ConstString(new_name.c_str()),
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buffer,
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lldb::endian::InlHostByteOrder(),
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exe_ctx.GetAddressByteSize());
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m_address_of_backend->GetValue().SetValueType(Value::eValueTypeScalar);
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m_address_of_backend->GetValue().GetScalar() = m_live_address;
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return m_address_of_backend;
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}
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else
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return lldb::ValueObjectSP();
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}
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lldb::addr_t
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ValueObjectConstResultImpl::GetAddressOf (bool scalar_is_load_address,
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AddressType *address_type)
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{
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if (m_impl_backend == NULL)
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return 0;
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if (m_live_address == LLDB_INVALID_ADDRESS)
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{
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return m_impl_backend->ValueObject::GetAddressOf (scalar_is_load_address,
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address_type);
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}
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if (address_type)
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*address_type = m_live_address_type;
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return m_live_address;
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}
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size_t
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ValueObjectConstResultImpl::GetPointeeData (DataExtractor& data,
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uint32_t item_idx,
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uint32_t item_count)
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{
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if (m_impl_backend == NULL)
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return 0;
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#if defined (TRIVIAL_IMPL) && TRIVIAL_IMPL == 1
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return m_impl_backend->ValueObject::GetPointeeData(data, item_idx, item_count);
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#else
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m_impl_backend->UpdateValueIfNeeded(false);
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if (NeedsDerefOnTarget() && m_impl_backend->IsPointerType())
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return DerefOnTarget()->GetPointeeData(data, item_idx, item_count);
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else
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return m_impl_backend->ValueObject::GetPointeeData(data, item_idx, item_count);
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#endif
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}
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