forked from OSchip/llvm-project
461 lines
17 KiB
C++
461 lines
17 KiB
C++
//===-- AppleObjCRuntimeV1.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 "AppleObjCRuntimeV1.h"
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#include "AppleObjCTrampolineHandler.h"
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#include "AppleObjCDeclVendor.h"
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#include "clang/AST/Type.h"
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#include "lldb/Breakpoint/BreakpointLocation.h"
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#include "lldb/Core/ConstString.h"
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#include "lldb/Core/Error.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/Scalar.h"
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#include "lldb/Core/StreamString.h"
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#include "lldb/Expression/FunctionCaller.h"
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#include "lldb/Expression/UtilityFunction.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Symbol/Symbol.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/RegisterContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include <vector>
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using namespace lldb;
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using namespace lldb_private;
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AppleObjCRuntimeV1::AppleObjCRuntimeV1(Process *process) :
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AppleObjCRuntime (process),
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m_hash_signature (),
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m_isa_hash_table_ptr (LLDB_INVALID_ADDRESS)
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{
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}
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// for V1 runtime we just try to return a class name as that is the minimum level of support
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// required for the data formatters to work
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bool
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AppleObjCRuntimeV1::GetDynamicTypeAndAddress (ValueObject &in_value,
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lldb::DynamicValueType use_dynamic,
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TypeAndOrName &class_type_or_name,
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Address &address,
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Value::ValueType &value_type)
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{
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class_type_or_name.Clear();
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value_type = Value::ValueType::eValueTypeScalar;
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if (CouldHaveDynamicValue(in_value))
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{
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auto class_descriptor(GetClassDescriptor(in_value));
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if (class_descriptor && class_descriptor->IsValid() && class_descriptor->GetClassName())
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{
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const addr_t object_ptr = in_value.GetPointerValue();
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address.SetRawAddress(object_ptr);
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class_type_or_name.SetName(class_descriptor->GetClassName());
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}
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}
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return class_type_or_name.IsEmpty() == false;
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}
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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lldb_private::LanguageRuntime *
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AppleObjCRuntimeV1::CreateInstance (Process *process, lldb::LanguageType language)
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{
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// FIXME: This should be a MacOS or iOS process, and we need to look for the OBJC section to make
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// sure we aren't using the V1 runtime.
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if (language == eLanguageTypeObjC)
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{
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ModuleSP objc_module_sp;
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if (AppleObjCRuntime::GetObjCVersion (process, objc_module_sp) == ObjCRuntimeVersions::eAppleObjC_V1)
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return new AppleObjCRuntimeV1 (process);
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else
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return NULL;
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}
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else
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return NULL;
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}
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void
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AppleObjCRuntimeV1::Initialize()
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{
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PluginManager::RegisterPlugin (GetPluginNameStatic(),
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"Apple Objective C Language Runtime - Version 1",
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CreateInstance);
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}
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void
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AppleObjCRuntimeV1::Terminate()
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{
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PluginManager::UnregisterPlugin (CreateInstance);
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}
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lldb_private::ConstString
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AppleObjCRuntimeV1::GetPluginNameStatic()
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{
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static ConstString g_name("apple-objc-v1");
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return g_name;
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}
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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ConstString
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AppleObjCRuntimeV1::GetPluginName()
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{
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return GetPluginNameStatic();
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}
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uint32_t
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AppleObjCRuntimeV1::GetPluginVersion()
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{
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return 1;
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}
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BreakpointResolverSP
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AppleObjCRuntimeV1::CreateExceptionResolver (Breakpoint *bkpt, bool catch_bp, bool throw_bp)
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{
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BreakpointResolverSP resolver_sp;
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if (throw_bp)
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resolver_sp.reset (new BreakpointResolverName (bkpt,
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"objc_exception_throw",
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eFunctionNameTypeBase,
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eLanguageTypeUnknown,
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Breakpoint::Exact,
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0,
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eLazyBoolNo));
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// FIXME: don't do catch yet.
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return resolver_sp;
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}
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struct BufStruct {
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char contents[2048];
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};
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UtilityFunction *
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AppleObjCRuntimeV1::CreateObjectChecker(const char *name)
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{
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std::unique_ptr<BufStruct> buf(new BufStruct);
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assert(snprintf(&buf->contents[0], sizeof(buf->contents),
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"struct __objc_class \n"
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"{ \n"
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" struct __objc_class *isa; \n"
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" struct __objc_class *super_class; \n"
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" const char *name; \n"
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" // rest of struct elided because unused \n"
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"}; \n"
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" \n"
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"struct __objc_object \n"
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"{ \n"
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" struct __objc_class *isa; \n"
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"}; \n"
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" \n"
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"extern \"C\" void \n"
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"%s(void *$__lldb_arg_obj, void *$__lldb_arg_selector) \n"
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"{ \n"
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" struct __objc_object *obj = (struct __objc_object*)$__lldb_arg_obj; \n"
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" (int)strlen(obj->isa->name); \n"
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"} \n",
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name) < (int)sizeof(buf->contents));
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Error error;
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return GetTargetRef().GetUtilityFunctionForLanguage(buf->contents, eLanguageTypeObjC, name, error);
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}
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AppleObjCRuntimeV1::ClassDescriptorV1::ClassDescriptorV1 (ValueObject &isa_pointer)
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{
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Initialize (isa_pointer.GetValueAsUnsigned(0),
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isa_pointer.GetProcessSP());
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}
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AppleObjCRuntimeV1::ClassDescriptorV1::ClassDescriptorV1 (ObjCISA isa, lldb::ProcessSP process_sp)
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{
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Initialize (isa, process_sp);
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}
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void
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AppleObjCRuntimeV1::ClassDescriptorV1::Initialize (ObjCISA isa, lldb::ProcessSP process_sp)
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{
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if (!isa || !process_sp)
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{
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m_valid = false;
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return;
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}
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m_valid = true;
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Error error;
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m_isa = process_sp->ReadPointerFromMemory(isa, error);
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if (error.Fail())
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{
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m_valid = false;
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return;
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}
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uint32_t ptr_size = process_sp->GetAddressByteSize();
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if (!IsPointerValid(m_isa,ptr_size))
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{
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m_valid = false;
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return;
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}
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m_parent_isa = process_sp->ReadPointerFromMemory(m_isa + ptr_size,error);
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if (error.Fail())
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{
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m_valid = false;
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return;
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}
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if (!IsPointerValid(m_parent_isa,ptr_size,true))
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{
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m_valid = false;
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return;
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}
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lldb::addr_t name_ptr = process_sp->ReadPointerFromMemory(m_isa + 2 * ptr_size,error);
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if (error.Fail())
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{
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m_valid = false;
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return;
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}
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lldb::DataBufferSP buffer_sp(new DataBufferHeap(1024, 0));
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size_t count = process_sp->ReadCStringFromMemory(name_ptr, (char*)buffer_sp->GetBytes(), 1024, error);
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if (error.Fail())
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{
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m_valid = false;
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return;
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}
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if (count)
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m_name = ConstString((char*)buffer_sp->GetBytes());
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else
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m_name = ConstString();
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m_instance_size = process_sp->ReadUnsignedIntegerFromMemory(m_isa + 5 * ptr_size, ptr_size, 0, error);
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if (error.Fail())
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{
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m_valid = false;
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return;
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}
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m_process_wp = lldb::ProcessWP(process_sp);
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}
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AppleObjCRuntime::ClassDescriptorSP
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AppleObjCRuntimeV1::ClassDescriptorV1::GetSuperclass ()
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{
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if (!m_valid)
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return AppleObjCRuntime::ClassDescriptorSP();
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ProcessSP process_sp = m_process_wp.lock();
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if (!process_sp)
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return AppleObjCRuntime::ClassDescriptorSP();
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return ObjCLanguageRuntime::ClassDescriptorSP(new AppleObjCRuntimeV1::ClassDescriptorV1(m_parent_isa,process_sp));
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}
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AppleObjCRuntime::ClassDescriptorSP
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AppleObjCRuntimeV1::ClassDescriptorV1::GetMetaclass () const
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{
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return ClassDescriptorSP();
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}
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bool
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AppleObjCRuntimeV1::ClassDescriptorV1::Describe (std::function <void (ObjCLanguageRuntime::ObjCISA)> const &superclass_func,
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std::function <bool (const char *, const char *)> const &instance_method_func,
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std::function <bool (const char *, const char *)> const &class_method_func,
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std::function <bool (const char *, const char *, lldb::addr_t, uint64_t)> const &ivar_func) const
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{
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return false;
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}
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lldb::addr_t
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AppleObjCRuntimeV1::GetISAHashTablePointer ()
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{
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if (m_isa_hash_table_ptr == LLDB_INVALID_ADDRESS)
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{
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ModuleSP objc_module_sp(GetObjCModule());
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if (!objc_module_sp)
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return LLDB_INVALID_ADDRESS;
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static ConstString g_objc_debug_class_hash("_objc_debug_class_hash");
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const Symbol *symbol = objc_module_sp->FindFirstSymbolWithNameAndType(g_objc_debug_class_hash, lldb::eSymbolTypeData);
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if (symbol && symbol->ValueIsAddress())
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{
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Process *process = GetProcess();
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if (process)
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{
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lldb::addr_t objc_debug_class_hash_addr = symbol->GetAddressRef().GetLoadAddress(&process->GetTarget());
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if (objc_debug_class_hash_addr != LLDB_INVALID_ADDRESS)
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{
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Error error;
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lldb::addr_t objc_debug_class_hash_ptr = process->ReadPointerFromMemory(objc_debug_class_hash_addr, error);
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if (objc_debug_class_hash_ptr != 0 &&
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objc_debug_class_hash_ptr != LLDB_INVALID_ADDRESS)
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{
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m_isa_hash_table_ptr = objc_debug_class_hash_ptr;
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}
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}
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}
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}
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}
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return m_isa_hash_table_ptr;
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}
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void
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AppleObjCRuntimeV1::UpdateISAToDescriptorMapIfNeeded()
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{
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// TODO: implement HashTableSignature...
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Process *process = GetProcess();
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if (process)
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{
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// Update the process stop ID that indicates the last time we updated the
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// map, whether it was successful or not.
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m_isa_to_descriptor_stop_id = process->GetStopID();
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
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ProcessSP process_sp = process->shared_from_this();
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ModuleSP objc_module_sp(GetObjCModule());
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if (!objc_module_sp)
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return;
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uint32_t isa_count = 0;
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lldb::addr_t hash_table_ptr = GetISAHashTablePointer ();
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if (hash_table_ptr != LLDB_INVALID_ADDRESS)
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{
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// Read the NXHashTable struct:
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//
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// typedef struct {
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// const NXHashTablePrototype *prototype;
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// unsigned count;
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// unsigned nbBuckets;
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// void *buckets;
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// const void *info;
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// } NXHashTable;
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Error error;
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DataBufferHeap buffer(1024, 0);
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if (process->ReadMemory(hash_table_ptr, buffer.GetBytes(), 20, error) == 20)
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{
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const uint32_t addr_size = m_process->GetAddressByteSize();
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const ByteOrder byte_order = m_process->GetByteOrder();
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DataExtractor data (buffer.GetBytes(), buffer.GetByteSize(), byte_order, addr_size);
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lldb::offset_t offset = addr_size; // Skip prototype
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const uint32_t count = data.GetU32(&offset);
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const uint32_t num_buckets = data.GetU32(&offset);
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const addr_t buckets_ptr = data.GetPointer(&offset);
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if (m_hash_signature.NeedsUpdate (count, num_buckets, buckets_ptr))
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{
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m_hash_signature.UpdateSignature (count, num_buckets, buckets_ptr);
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const uint32_t data_size = num_buckets * 2 * sizeof(uint32_t);
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buffer.SetByteSize(data_size);
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if (process->ReadMemory(buckets_ptr, buffer.GetBytes(), data_size, error) == data_size)
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{
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data.SetData(buffer.GetBytes(), buffer.GetByteSize(), byte_order);
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offset = 0;
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for (uint32_t bucket_idx = 0; bucket_idx < num_buckets; ++bucket_idx)
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{
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const uint32_t bucket_isa_count = data.GetU32 (&offset);
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const lldb::addr_t bucket_data = data.GetU32 (&offset);
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if (bucket_isa_count == 0)
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continue;
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isa_count += bucket_isa_count;
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ObjCISA isa;
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if (bucket_isa_count == 1)
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{
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// When we only have one entry in the bucket, the bucket data is the "isa"
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isa = bucket_data;
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if (isa)
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{
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if (!ISAIsCached(isa))
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{
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ClassDescriptorSP descriptor_sp (new ClassDescriptorV1(isa, process_sp));
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if (log && log->GetVerbose())
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log->Printf("AppleObjCRuntimeV1 added (ObjCISA)0x%" PRIx64 " from _objc_debug_class_hash to isa->descriptor cache", isa);
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AddClass (isa, descriptor_sp);
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}
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}
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}
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else
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{
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// When we have more than one entry in the bucket, the bucket data is a pointer
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// to an array of "isa" values
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addr_t isa_addr = bucket_data;
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for (uint32_t isa_idx = 0; isa_idx < bucket_isa_count; ++isa_idx, isa_addr += addr_size)
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{
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isa = m_process->ReadPointerFromMemory(isa_addr, error);
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if (isa && isa != LLDB_INVALID_ADDRESS)
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{
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if (!ISAIsCached(isa))
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{
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ClassDescriptorSP descriptor_sp (new ClassDescriptorV1(isa, process_sp));
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if (log && log->GetVerbose())
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log->Printf("AppleObjCRuntimeV1 added (ObjCISA)0x%" PRIx64 " from _objc_debug_class_hash to isa->descriptor cache", isa);
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AddClass (isa, descriptor_sp);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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else
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{
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m_isa_to_descriptor_stop_id = UINT32_MAX;
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}
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}
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DeclVendor *
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AppleObjCRuntimeV1::GetDeclVendor()
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{
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if (!m_decl_vendor_ap.get())
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m_decl_vendor_ap.reset(new AppleObjCDeclVendor(*this));
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return m_decl_vendor_ap.get();
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}
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