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llvm-project/lldb/source/Target/ObjCLanguageRuntime.cpp

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//===-- ObjCLanguageRuntime.cpp ---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Type.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/MappedHash.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/Type.h"
#include "lldb/Symbol/TypeList.h"
#include "lldb/Target/ObjCLanguageRuntime.h"
#include "lldb/Target/Target.h"
#include "llvm/ADT/StringRef.h"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
ObjCLanguageRuntime::~ObjCLanguageRuntime()
{
}
ObjCLanguageRuntime::ObjCLanguageRuntime (Process *process) :
LanguageRuntime (process),
m_impl_cache(),
m_has_new_literals_and_indexing (eLazyBoolCalculate),
m_isa_to_descriptor(),
m_hash_to_isa_map(),
m_type_size_cache(),
m_isa_to_descriptor_stop_id (UINT32_MAX),
m_complete_class_cache(),
m_negative_complete_class_cache()
{
}
bool
ObjCLanguageRuntime::AddClass (ObjCISA isa, const ClassDescriptorSP &descriptor_sp, const char *class_name)
{
if (isa != 0)
{
m_isa_to_descriptor[isa] = descriptor_sp;
// class_name is assumed to be valid
m_hash_to_isa_map.insert(std::make_pair(MappedHash::HashStringUsingDJB(class_name), isa));
return true;
}
return false;
}
void
ObjCLanguageRuntime::AddToMethodCache (lldb::addr_t class_addr, lldb::addr_t selector, lldb::addr_t impl_addr)
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
{
log->Printf ("Caching: class 0x%" PRIx64 " selector 0x%" PRIx64 " implementation 0x%" PRIx64 ".", class_addr, selector, impl_addr);
}
m_impl_cache.insert (std::pair<ClassAndSel,lldb::addr_t> (ClassAndSel(class_addr, selector), impl_addr));
}
lldb::addr_t
ObjCLanguageRuntime::LookupInMethodCache (lldb::addr_t class_addr, lldb::addr_t selector)
{
MsgImplMap::iterator pos, end = m_impl_cache.end();
pos = m_impl_cache.find (ClassAndSel(class_addr, selector));
if (pos != end)
return (*pos).second;
return LLDB_INVALID_ADDRESS;
}
lldb::TypeSP
ObjCLanguageRuntime::LookupInCompleteClassCache (ConstString &name)
{
CompleteClassMap::iterator complete_class_iter = m_complete_class_cache.find(name);
if (complete_class_iter != m_complete_class_cache.end())
{
// Check the weak pointer to make sure the type hasn't been unloaded
TypeSP complete_type_sp (complete_class_iter->second.lock());
if (complete_type_sp)
return complete_type_sp;
else
m_complete_class_cache.erase(name);
}
if (m_negative_complete_class_cache.count(name) > 0)
return TypeSP();
const ModuleList &modules = m_process->GetTarget().GetImages();
SymbolContextList sc_list;
const size_t matching_symbols = modules.FindSymbolsWithNameAndType (name,
eSymbolTypeObjCClass,
sc_list);
if (matching_symbols)
{
SymbolContext sc;
sc_list.GetContextAtIndex(0, sc);
ModuleSP module_sp(sc.module_sp);
if (!module_sp)
return TypeSP();
const SymbolContext null_sc;
const bool exact_match = true;
const uint32_t max_matches = UINT32_MAX;
TypeList types;
llvm::DenseSet<SymbolFile *> searched_symbol_files;
const uint32_t num_types = module_sp->FindTypes (null_sc,
name,
exact_match,
max_matches,
searched_symbol_files,
types);
if (num_types)
{
uint32_t i;
for (i = 0; i < num_types; ++i)
{
TypeSP type_sp (types.GetTypeAtIndex(i));
if (ClangASTContext::IsObjCObjectOrInterfaceType(type_sp->GetForwardCompilerType ()))
{
if (type_sp->IsCompleteObjCClass())
{
m_complete_class_cache[name] = type_sp;
return type_sp;
}
}
}
}
}
m_negative_complete_class_cache.insert(name);
return TypeSP();
}
size_t
ObjCLanguageRuntime::GetByteOffsetForIvar (CompilerType &parent_qual_type, const char *ivar_name)
{
return LLDB_INVALID_IVAR_OFFSET;
}
bool
ObjCLanguageRuntime::ClassDescriptor::IsPointerValid (lldb::addr_t value,
uint32_t ptr_size,
bool allow_NULLs,
bool allow_tagged,
bool check_version_specific) const
{
if (!value)
return allow_NULLs;
if ( (value % 2) == 1 && allow_tagged)
return true;
if ((value % ptr_size) == 0)
return (check_version_specific ? CheckPointer(value,ptr_size) : true);
else
return false;
}
ObjCLanguageRuntime::ObjCISA
ObjCLanguageRuntime::GetISA(const ConstString &name)
{
ISAToDescriptorIterator pos = GetDescriptorIterator (name);
if (pos != m_isa_to_descriptor.end())
return pos->first;
return 0;
}
ObjCLanguageRuntime::ISAToDescriptorIterator
ObjCLanguageRuntime::GetDescriptorIterator (const ConstString &name)
{
ISAToDescriptorIterator end = m_isa_to_descriptor.end();
if (name)
{
UpdateISAToDescriptorMap();
if (m_hash_to_isa_map.empty())
{
// No name hashes were provided, we need to just linearly power through the
// names and find a match
for (ISAToDescriptorIterator pos = m_isa_to_descriptor.begin(); pos != end; ++pos)
{
if (pos->second->GetClassName() == name)
return pos;
}
}
else
{
// Name hashes were provided, so use them to efficiently lookup name to isa/descriptor
const uint32_t name_hash = MappedHash::HashStringUsingDJB (name.GetCString());
std::pair <HashToISAIterator, HashToISAIterator> range = m_hash_to_isa_map.equal_range(name_hash);
for (HashToISAIterator range_pos = range.first; range_pos != range.second; ++range_pos)
{
ISAToDescriptorIterator pos = m_isa_to_descriptor.find (range_pos->second);
if (pos != m_isa_to_descriptor.end())
{
if (pos->second->GetClassName() == name)
return pos;
}
}
}
}
return end;
}
std::pair<ObjCLanguageRuntime::ISAToDescriptorIterator,ObjCLanguageRuntime::ISAToDescriptorIterator>
ObjCLanguageRuntime::GetDescriptorIteratorPair (bool update_if_needed)
{
if (update_if_needed)
UpdateISAToDescriptorMapIfNeeded();
return std::pair<ObjCLanguageRuntime::ISAToDescriptorIterator,
ObjCLanguageRuntime::ISAToDescriptorIterator>(
m_isa_to_descriptor.begin(),
m_isa_to_descriptor.end());
}
ObjCLanguageRuntime::ObjCISA
ObjCLanguageRuntime::GetParentClass(ObjCLanguageRuntime::ObjCISA isa)
{
ClassDescriptorSP objc_class_sp (GetClassDescriptorFromISA(isa));
if (objc_class_sp)
{
ClassDescriptorSP objc_super_class_sp (objc_class_sp->GetSuperclass());
if (objc_super_class_sp)
return objc_super_class_sp->GetISA();
}
return 0;
}
ConstString
ObjCLanguageRuntime::GetActualTypeName(ObjCLanguageRuntime::ObjCISA isa)
{
ClassDescriptorSP objc_class_sp (GetNonKVOClassDescriptor(isa));
if (objc_class_sp)
return objc_class_sp->GetClassName();
return ConstString();
}
ObjCLanguageRuntime::ClassDescriptorSP
ObjCLanguageRuntime::GetClassDescriptorFromClassName (const ConstString &class_name)
{
ISAToDescriptorIterator pos = GetDescriptorIterator (class_name);
if (pos != m_isa_to_descriptor.end())
return pos->second;
return ClassDescriptorSP();
}
ObjCLanguageRuntime::ClassDescriptorSP
ObjCLanguageRuntime::GetClassDescriptor (ValueObject& valobj)
{
ClassDescriptorSP objc_class_sp;
// if we get an invalid VO (which might still happen when playing around
// with pointers returned by the expression parser, don't consider this
// a valid ObjC object)
if (valobj.GetCompilerType().IsValid())
{
addr_t isa_pointer = valobj.GetPointerValue();
if (isa_pointer != LLDB_INVALID_ADDRESS)
{
ExecutionContext exe_ctx (valobj.GetExecutionContextRef());
Process *process = exe_ctx.GetProcessPtr();
if (process)
{
Error error;
ObjCISA isa = process->ReadPointerFromMemory(isa_pointer, error);
if (isa != LLDB_INVALID_ADDRESS)
objc_class_sp = GetClassDescriptorFromISA (isa);
}
}
}
return objc_class_sp;
}
ObjCLanguageRuntime::ClassDescriptorSP
ObjCLanguageRuntime::GetNonKVOClassDescriptor (ValueObject& valobj)
{
ObjCLanguageRuntime::ClassDescriptorSP objc_class_sp (GetClassDescriptor (valobj));
if (objc_class_sp)
{
if (!objc_class_sp->IsKVO())
return objc_class_sp;
ClassDescriptorSP non_kvo_objc_class_sp(objc_class_sp->GetSuperclass());
if (non_kvo_objc_class_sp && non_kvo_objc_class_sp->IsValid())
return non_kvo_objc_class_sp;
}
return ClassDescriptorSP();
}
ObjCLanguageRuntime::ClassDescriptorSP
ObjCLanguageRuntime::GetClassDescriptorFromISA (ObjCISA isa)
{
if (isa)
{
UpdateISAToDescriptorMap();
ObjCLanguageRuntime::ISAToDescriptorIterator pos = m_isa_to_descriptor.find(isa);
if (pos != m_isa_to_descriptor.end())
return pos->second;
}
return ClassDescriptorSP();
}
ObjCLanguageRuntime::ClassDescriptorSP
ObjCLanguageRuntime::GetNonKVOClassDescriptor (ObjCISA isa)
{
if (isa)
{
ClassDescriptorSP objc_class_sp = GetClassDescriptorFromISA (isa);
if (objc_class_sp && objc_class_sp->IsValid())
{
if (!objc_class_sp->IsKVO())
return objc_class_sp;
ClassDescriptorSP non_kvo_objc_class_sp(objc_class_sp->GetSuperclass());
if (non_kvo_objc_class_sp && non_kvo_objc_class_sp->IsValid())
return non_kvo_objc_class_sp;
}
}
return ClassDescriptorSP();
}
CompilerType
ObjCLanguageRuntime::EncodingToType::RealizeType (const char* name, bool for_expression)
{
if (m_scratch_ast_ctx_ap)
return RealizeType(*m_scratch_ast_ctx_ap, name, for_expression);
return CompilerType();
}
CompilerType
ObjCLanguageRuntime::EncodingToType::RealizeType (ClangASTContext& ast_ctx, const char* name, bool for_expression)
{
clang::ASTContext *clang_ast = ast_ctx.getASTContext();
if (!clang_ast)
return CompilerType();
return RealizeType(*clang_ast, name, for_expression);
}
ObjCLanguageRuntime::EncodingToType::~EncodingToType() {}
ObjCLanguageRuntime::EncodingToTypeSP
ObjCLanguageRuntime::GetEncodingToType ()
{
return nullptr;
}
bool
ObjCLanguageRuntime::GetTypeBitSize (const CompilerType& compiler_type,
uint64_t &size)
{
void *opaque_ptr = compiler_type.GetOpaqueQualType();
size = m_type_size_cache.Lookup(opaque_ptr);
// an ObjC object will at least have an ISA, so 0 is definitely not OK
if (size > 0)
return true;
ClassDescriptorSP class_descriptor_sp = GetClassDescriptorFromClassName(compiler_type.GetTypeName());
if (!class_descriptor_sp)
return false;
int32_t max_offset = INT32_MIN;
uint64_t sizeof_max = 0;
bool found = false;
for (size_t idx = 0;
idx < class_descriptor_sp->GetNumIVars();
idx++)
{
const auto& ivar = class_descriptor_sp->GetIVarAtIndex(idx);
int32_t cur_offset = ivar.m_offset;
if (cur_offset > max_offset)
{
max_offset = cur_offset;
sizeof_max = ivar.m_size;
found = true;
}
}
size = 8 * (max_offset + sizeof_max);
if (found)
m_type_size_cache.Insert(opaque_ptr, size);
return found;
}
//------------------------------------------------------------------
// Exception breakpoint Precondition class for ObjC:
//------------------------------------------------------------------
void
ObjCLanguageRuntime::ObjCExceptionPrecondition::AddClassName(const char *class_name)
{
m_class_names.insert(class_name);
}
ObjCLanguageRuntime::ObjCExceptionPrecondition::ObjCExceptionPrecondition()
{
}
bool
ObjCLanguageRuntime::ObjCExceptionPrecondition::EvaluatePrecondition(StoppointCallbackContext &context)
{
return true;
}
void
ObjCLanguageRuntime::ObjCExceptionPrecondition::GetDescription(Stream &stream, lldb::DescriptionLevel level)
{
}
Error
ObjCLanguageRuntime::ObjCExceptionPrecondition::ConfigurePrecondition(Args &args)
{
Error error;
if (args.GetArgumentCount() > 0)
error.SetErrorString("The ObjC Exception breakpoint doesn't support extra options.");
return error;
}
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