OSchip
/
llvm-project
mirror of https://github.com/THU-DSP-LAB/llvm-project.git
13
0
Fork 6
Code Issues Packages Projects Releases Wiki Activity
llvm-project/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp

2637 lines
96 KiB
C++
Raw Blame History

//===-- AppleObjCRuntimeV2.cpp --------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-python.h"
#include <string>
#include <vector>
#include <stdint.h>
#include "lldb/lldb-enumerations.h"
#include "lldb/Core/ClangForward.h"
#include "lldb/Symbol/ClangASTType.h"
#include "lldb/Core/ClangForward.h"
#include "lldb/Core/ConstString.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Scalar.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/ValueObjectVariable.h"
#include "lldb/Expression/ClangFunction.h"
#include "lldb/Expression/ClangUtilityFunction.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/TypeList.h"
#include "lldb/Symbol/VariableList.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "AppleObjCRuntimeV2.h"
#include "AppleObjCTypeVendor.h"
#include "AppleObjCTrampolineHandler.h"
#include <vector>
using namespace lldb;
using namespace lldb_private;
// 2 second timeout when running utility functions
#define UTILITY_FUNCTION_TIMEOUT_USEC 2*1000*1000
static const char *g_get_dynamic_class_info_name = "__lldb_apple_objc_v2_get_dynamic_class_info";
// Testing using the new C++11 raw string literals. If this breaks GCC then we will
// need to revert to the code above...
static const char *g_get_dynamic_class_info_body = R"(
extern "C"
{
size_t strlen(const char *);
char *strncpy (char * s1, const char * s2, size_t n);
int printf(const char * format, ...);
}
//#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN
#ifdef ENABLE_DEBUG_PRINTF
#define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__)
#else
#define DEBUG_PRINTF(fmt, ...)
#endif
typedef struct _NXMapTable {
void *prototype;
unsigned num_classes;
unsigned num_buckets_minus_one;
void *buckets;
} NXMapTable;
#define NX_MAPNOTAKEY ((void *)(-1))
typedef struct BucketInfo
{
const char *name_ptr;
Class isa;
} BucketInfo;
struct ClassInfo
{
Class isa;
uint32_t hash;
} __attribute__((__packed__));
uint32_t
__lldb_apple_objc_v2_get_dynamic_class_info (void *gdb_objc_realized_classes_ptr,
void *class_infos_ptr,
uint32_t class_infos_byte_size)
{
DEBUG_PRINTF ("gdb_objc_realized_classes_ptr = %p\n", gdb_objc_realized_classes_ptr);
DEBUG_PRINTF ("class_infos_ptr = %p\n", class_infos_ptr);
DEBUG_PRINTF ("class_infos_byte_size = %u\n", class_infos_byte_size);
const NXMapTable *grc = (const NXMapTable *)gdb_objc_realized_classes_ptr;
if (grc)
{
const unsigned num_classes = grc->num_classes;
if (class_infos_ptr)
{
const size_t max_class_infos = class_infos_byte_size/sizeof(ClassInfo);
ClassInfo *class_infos = (ClassInfo *)class_infos_ptr;
BucketInfo *buckets = (BucketInfo *)grc->buckets;
uint32_t idx = 0;
for (unsigned i=0; i<=grc->num_buckets_minus_one; ++i)
{
if (buckets[i].name_ptr != NX_MAPNOTAKEY)
{
if (idx < max_class_infos)
{
const char *s = buckets[i].name_ptr;
uint32_t h = 5381;
for (unsigned char c = *s; c; c = *++s)
h = ((h << 5) + h) + c;
class_infos[idx].hash = h;
class_infos[idx].isa = buckets[i].isa;
}
++idx;
}
}
if (idx < max_class_infos)
{
class_infos[idx].isa = NULL;
class_infos[idx].hash = 0;
}
}
return num_classes;
}
return 0;
}
)";
static const char *g_get_shared_cache_class_info_name = "__lldb_apple_objc_v2_get_shared_cache_class_info";
// Testing using the new C++11 raw string literals. If this breaks GCC then we will
// need to revert to the code above...
static const char *g_get_shared_cache_class_info_body = R"(
extern "C"
{
const char *class_getName(void *objc_class);
size_t strlen(const char *);
char *strncpy (char * s1, const char * s2, size_t n);
int printf(const char * format, ...);
}
//#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN
#ifdef ENABLE_DEBUG_PRINTF
#define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__)
#else
#define DEBUG_PRINTF(fmt, ...)
#endif
struct objc_classheader_t {
int32_t clsOffset;
int32_t hiOffset;
};
struct objc_clsopt_t {
uint32_t capacity;
uint32_t occupied;
uint32_t shift;
uint32_t mask;
uint32_t zero;
uint32_t unused;
uint64_t salt;
uint32_t scramble[256];
uint8_t tab[0]; // tab[mask+1]
// uint8_t checkbytes[capacity];
// int32_t offset[capacity];
// objc_classheader_t clsOffsets[capacity];
// uint32_t duplicateCount;
// objc_classheader_t duplicateOffsets[duplicateCount];
};
struct objc_opt_t {
uint32_t version;
int32_t selopt_offset;
int32_t headeropt_offset;
int32_t clsopt_offset;
};
struct ClassInfo
{
Class isa;
uint32_t hash;
} __attribute__((__packed__));
uint32_t
__lldb_apple_objc_v2_get_shared_cache_class_info (void *objc_opt_ro_ptr,
void *class_infos_ptr,
uint32_t class_infos_byte_size)
{
uint32_t idx = 0;
DEBUG_PRINTF ("objc_opt_ro_ptr = %p\n", objc_opt_ro_ptr);
DEBUG_PRINTF ("class_infos_ptr = %p\n", class_infos_ptr);
DEBUG_PRINTF ("class_infos_byte_size = %u (%" PRIu64 " class infos)\n", class_infos_byte_size, (size_t)(class_infos_byte_size/sizeof(ClassInfo)));
if (objc_opt_ro_ptr)
{
const objc_opt_t *objc_opt = (objc_opt_t *)objc_opt_ro_ptr;
DEBUG_PRINTF ("objc_opt->version = %u\n", objc_opt->version);
DEBUG_PRINTF ("objc_opt->selopt_offset = %d\n", objc_opt->selopt_offset);
DEBUG_PRINTF ("objc_opt->headeropt_offset = %d\n", objc_opt->headeropt_offset);
DEBUG_PRINTF ("objc_opt->clsopt_offset = %d\n", objc_opt->clsopt_offset);
if (objc_opt->version == 12)
{
const objc_clsopt_t* clsopt = (const objc_clsopt_t*)((uint8_t *)objc_opt + objc_opt->clsopt_offset);
const size_t max_class_infos = class_infos_byte_size/sizeof(ClassInfo);
ClassInfo *class_infos = (ClassInfo *)class_infos_ptr;
int32_t zeroOffset = 16;
const uint8_t *checkbytes = &clsopt->tab[clsopt->mask+1];
const int32_t *offsets = (const int32_t *)(checkbytes + clsopt->capacity);
const objc_classheader_t *classOffsets = (const objc_classheader_t *)(offsets + clsopt->capacity);
DEBUG_PRINTF ("clsopt->capacity = %u\n", clsopt->capacity);
DEBUG_PRINTF ("clsopt->mask = 0x%8.8x\n", clsopt->mask);
DEBUG_PRINTF ("classOffsets = %p\n", classOffsets);
for (uint32_t i=0; i<clsopt->capacity; ++i)
{
const int32_t clsOffset = classOffsets[i].clsOffset;
if (clsOffset & 1)
continue; // duplicate
else if (clsOffset == zeroOffset)
continue; // zero offset
if (class_infos && idx < max_class_infos)
{
class_infos[idx].isa = (Class)((uint8_t *)clsopt + clsOffset);
const char *name = class_getName (class_infos[idx].isa);
DEBUG_PRINTF ("[%u] isa = %8p %s\n", idx, class_infos[idx].isa, name);
// Hash the class name so we don't have to read it
const char *s = name;
uint32_t h = 5381;
for (unsigned char c = *s; c; c = *++s)
h = ((h << 5) + h) + c;
class_infos[idx].hash = h;
}
++idx;
}
const uint32_t *duplicate_count_ptr = (uint32_t *)&classOffsets[clsopt->capacity];
const uint32_t duplicate_count = *duplicate_count_ptr;
const objc_classheader_t *duplicateClassOffsets = (const objc_classheader_t *)(&duplicate_count_ptr[1]);
DEBUG_PRINTF ("duplicate_count = %u\n", duplicate_count);
DEBUG_PRINTF ("duplicateClassOffsets = %p\n", duplicateClassOffsets);
for (uint32_t i=0; i<duplicate_count; ++i)
{
const int32_t clsOffset = duplicateClassOffsets[i].clsOffset;
if (clsOffset & 1)
continue; // duplicate
else if (clsOffset == zeroOffset)
continue; // zero offset
if (class_infos && idx < max_class_infos)
{
class_infos[idx].isa = (Class)((uint8_t *)clsopt + clsOffset);
const char *name = class_getName (class_infos[idx].isa);
DEBUG_PRINTF ("[%u] isa = %8p %s\n", idx, class_infos[idx].isa, name);
// Hash the class name so we don't have to read it
const char *s = name;
uint32_t h = 5381;
for (unsigned char c = *s; c; c = *++s)
h = ((h << 5) + h) + c;
class_infos[idx].hash = h;
}
++idx;
}
}
DEBUG_PRINTF ("%u class_infos\n", idx);
DEBUG_PRINTF ("done\n");
}
return idx;
}
)";
static uint64_t
ExtractRuntimeGlobalSymbol (Process* process,
ConstString name,
const ModuleSP &module_sp,
Error& error,
bool read_value = true,
uint8_t byte_size = 0,
uint64_t default_value = LLDB_INVALID_ADDRESS,
SymbolType sym_type = lldb::eSymbolTypeData)
{
if (!process)
{
error.SetErrorString("no process");
return default_value;
}
if (!module_sp)
{
error.SetErrorString("no module");
return default_value;
}
if (!byte_size)
byte_size = process->GetAddressByteSize();
const Symbol *symbol = module_sp->FindFirstSymbolWithNameAndType(name, lldb::eSymbolTypeData);
if (symbol)
{
lldb::addr_t symbol_load_addr = symbol->GetAddress().GetLoadAddress(&process->GetTarget());
if (symbol_load_addr != LLDB_INVALID_ADDRESS)
{
if (read_value)
return process->ReadUnsignedIntegerFromMemory(symbol_load_addr, byte_size, default_value, error);
else
return symbol_load_addr;
}
else
{
error.SetErrorString("symbol address invalid");
return default_value;
}
}
else
{
error.SetErrorString("no symbol");
return default_value;
}
}
AppleObjCRuntimeV2::AppleObjCRuntimeV2 (Process *process,
const ModuleSP &objc_module_sp) :
AppleObjCRuntime (process),
m_get_class_info_function(),
m_get_class_info_code(),
m_get_class_info_args (LLDB_INVALID_ADDRESS),
m_get_class_info_args_mutex (Mutex::eMutexTypeNormal),
m_get_shared_cache_class_info_function(),
m_get_shared_cache_class_info_code(),
m_get_shared_cache_class_info_args (LLDB_INVALID_ADDRESS),
m_get_shared_cache_class_info_args_mutex (Mutex::eMutexTypeNormal),
m_type_vendor_ap (),
m_isa_hash_table_ptr (LLDB_INVALID_ADDRESS),
m_hash_signature (),
m_has_object_getClass (false),
m_loaded_objc_opt (false),
m_non_pointer_isa_cache_ap(NonPointerISACache::CreateInstance(*this,objc_module_sp)),
m_tagged_pointer_vendor_ap(TaggedPointerVendor::CreateInstance(*this,objc_module_sp))
{
static const ConstString g_gdb_object_getClass("gdb_object_getClass");
m_has_object_getClass = (objc_module_sp->FindFirstSymbolWithNameAndType(g_gdb_object_getClass, eSymbolTypeCode) != NULL);
}
AppleObjCRuntimeV2::~AppleObjCRuntimeV2()
{
}
bool
AppleObjCRuntimeV2::GetDynamicTypeAndAddress (ValueObject &in_value,
DynamicValueType use_dynamic,
TypeAndOrName &class_type_or_name,
Address &address)
{
// The Runtime is attached to a particular process, you shouldn't pass in a value from another process.
assert (in_value.GetProcessSP().get() == m_process);
assert (m_process != NULL);
class_type_or_name.Clear();
// Make sure we can have a dynamic value before starting...
if (CouldHaveDynamicValue (in_value))
{
// First job, pull out the address at 0 offset from the object That will be the ISA pointer.
ClassDescriptorSP objc_class_sp (GetNonKVOClassDescriptor (in_value));
if (objc_class_sp)
{
const addr_t object_ptr = in_value.GetPointerValue();
address.SetRawAddress(object_ptr);
ConstString class_name (objc_class_sp->GetClassName());
class_type_or_name.SetName(class_name);
TypeSP type_sp (objc_class_sp->GetType());
if (type_sp)
class_type_or_name.SetTypeSP (type_sp);
else
{
type_sp = LookupInCompleteClassCache (class_name);
if (type_sp)
{
objc_class_sp->SetType (type_sp);
class_type_or_name.SetTypeSP (type_sp);
}
else
{
// try to go for a ClangASTType at least
TypeVendor* vendor = GetTypeVendor();
if (vendor)
{
std::vector<ClangASTType> types;
if (vendor->FindTypes(class_name, false, 1, types) && types.size() && types.at(0).IsValid())
class_type_or_name.SetClangASTType(types.at(0));
}
}
}
}
}
return class_type_or_name.IsEmpty() == false;
}
//------------------------------------------------------------------
// Static Functions
//------------------------------------------------------------------
LanguageRuntime *
AppleObjCRuntimeV2::CreateInstance (Process *process, LanguageType language)
{
// FIXME: This should be a MacOS or iOS process, and we need to look for the OBJC section to make
// sure we aren't using the V1 runtime.
if (language == eLanguageTypeObjC)
{
ModuleSP objc_module_sp;
if (AppleObjCRuntime::GetObjCVersion (process, objc_module_sp) == eAppleObjC_V2)
return new AppleObjCRuntimeV2 (process, objc_module_sp);
else
return NULL;
}
else
return NULL;
}
void
AppleObjCRuntimeV2::Initialize()
{
PluginManager::RegisterPlugin (GetPluginNameStatic(),
"Apple Objective C Language Runtime - Version 2",
CreateInstance);
}
void
AppleObjCRuntimeV2::Terminate()
{
PluginManager::UnregisterPlugin (CreateInstance);
}
lldb_private::ConstString
AppleObjCRuntimeV2::GetPluginNameStatic()
{
static ConstString g_name("apple-objc-v2");
return g_name;
}
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
lldb_private::ConstString
AppleObjCRuntimeV2::GetPluginName()
{
return GetPluginNameStatic();
}
uint32_t
AppleObjCRuntimeV2::GetPluginVersion()
{
return 1;
}
BreakpointResolverSP
AppleObjCRuntimeV2::CreateExceptionResolver (Breakpoint *bkpt, bool catch_bp, bool throw_bp)
{
BreakpointResolverSP resolver_sp;
if (throw_bp)
resolver_sp.reset (new BreakpointResolverName (bkpt,
"objc_exception_throw",
eFunctionNameTypeBase,
Breakpoint::Exact,
eLazyBoolNo));
// FIXME: We don't do catch breakpoints for ObjC yet.
// Should there be some way for the runtime to specify what it can do in this regard?
return resolver_sp;
}
ClangUtilityFunction *
AppleObjCRuntimeV2::CreateObjectChecker(const char *name)
{
char check_function_code[2048];
int len = 0;
if (m_has_object_getClass)
{
len = ::snprintf (check_function_code,
sizeof(check_function_code),
"extern \"C\" void *gdb_object_getClass(void *); \n"
"extern \"C\" int printf(const char *format, ...); \n"
"extern \"C\" void \n"
"%s(void *$__lldb_arg_obj, void *$__lldb_arg_selector) \n"
"{ \n"
" if ($__lldb_arg_obj == (void *)0) \n"
" return; // nil is ok \n"
" if (!gdb_object_getClass($__lldb_arg_obj)) \n"
" *((volatile int *)0) = 'ocgc'; \n"
" else if ($__lldb_arg_selector != (void *)0) \n"
" { \n"
" signed char responds = (signed char) [(id) $__lldb_arg_obj \n"
" respondsToSelector: \n"
" (struct objc_selector *) $__lldb_arg_selector]; \n"
" if (responds == (signed char) 0) \n"
" *((volatile int *)0) = 'ocgc'; \n"
" } \n"
"} \n",
name);
}
else
{
len = ::snprintf (check_function_code,
sizeof(check_function_code),
"extern \"C\" void *gdb_class_getClass(void *); \n"
"extern \"C\" int printf(const char *format, ...); \n"
"extern \"C\" void \n"
"%s(void *$__lldb_arg_obj, void *$__lldb_arg_selector) \n"
"{ \n"
" if ($__lldb_arg_obj == (void *)0) \n"
" return; // nil is ok \n"
" void **$isa_ptr = (void **)$__lldb_arg_obj; \n"
" if (*$isa_ptr == (void *)0 || !gdb_class_getClass(*$isa_ptr)) \n"
" *((volatile int *)0) = 'ocgc'; \n"
" else if ($__lldb_arg_selector != (void *)0) \n"
" { \n"
" signed char responds = (signed char) [(id) $__lldb_arg_obj \n"
" respondsToSelector: \n"
" (struct objc_selector *) $__lldb_arg_selector]; \n"
" if (responds == (signed char) 0) \n"
" *((volatile int *)0) = 'ocgc'; \n"
" } \n"
"} \n",
name);
}
assert (len < (int)sizeof(check_function_code));
return new ClangUtilityFunction(check_function_code, name);
}
size_t
AppleObjCRuntimeV2::GetByteOffsetForIvar (ClangASTType &parent_ast_type, const char *ivar_name)
{
const char *class_name = parent_ast_type.GetConstTypeName().AsCString();
if (!class_name || *class_name == '\0' || !ivar_name || *ivar_name == '\0')
return LLDB_INVALID_IVAR_OFFSET;
std::string buffer("OBJC_IVAR_$_");
buffer.append (class_name);
buffer.push_back ('.');
buffer.append (ivar_name);
ConstString ivar_const_str (buffer.c_str());
SymbolContextList sc_list;
Target &target = m_process->GetTarget();
target.GetImages().FindSymbolsWithNameAndType(ivar_const_str, eSymbolTypeObjCIVar, sc_list);
SymbolContext ivar_offset_symbol;
if (sc_list.GetSize() != 1
|| !sc_list.GetContextAtIndex(0, ivar_offset_symbol)
|| ivar_offset_symbol.symbol == NULL)
return LLDB_INVALID_IVAR_OFFSET;
addr_t ivar_offset_address = ivar_offset_symbol.symbol->GetAddress().GetLoadAddress (&target);
Error error;
uint32_t ivar_offset = m_process->ReadUnsignedIntegerFromMemory (ivar_offset_address,
4,
LLDB_INVALID_IVAR_OFFSET,
error);
return ivar_offset;
}
// tagged pointers are special not-a-real-pointer values that contain both type and value information
// this routine attempts to check with as little computational effort as possible whether something
// could possibly be a tagged pointer - false positives are possible but false negatives shouldn't
bool
AppleObjCRuntimeV2::IsTaggedPointer(addr_t ptr)
{
if (!m_tagged_pointer_vendor_ap)
return false;
return m_tagged_pointer_vendor_ap->IsPossibleTaggedPointer(ptr);
}
class RemoteNXMapTable
{
public:
RemoteNXMapTable () :
m_count (0),
m_num_buckets_minus_one (0),
m_buckets_ptr (LLDB_INVALID_ADDRESS),
m_process (NULL),
m_end_iterator (*this, -1),
m_load_addr (LLDB_INVALID_ADDRESS),
m_map_pair_size (0),
m_invalid_key (0)
{
}
void
Dump ()
{
printf ("RemoteNXMapTable.m_load_addr = 0x%" PRIx64 "\n", m_load_addr);
printf ("RemoteNXMapTable.m_count = %u\n", m_count);
printf ("RemoteNXMapTable.m_num_buckets_minus_one = %u\n", m_num_buckets_minus_one);
printf ("RemoteNXMapTable.m_buckets_ptr = 0x%" PRIX64 "\n", m_buckets_ptr);
}
bool
ParseHeader (Process* process, lldb::addr_t load_addr)
{
m_process = process;
m_load_addr = load_addr;
m_map_pair_size = m_process->GetAddressByteSize() * 2;
m_invalid_key = m_process->GetAddressByteSize() == 8 ? UINT64_MAX : UINT32_MAX;
Error err;
// This currently holds true for all platforms we support, but we might
// need to change this to use get the actualy byte size of "unsigned"
// from the target AST...
const uint32_t unsigned_byte_size = sizeof(uint32_t);
// Skip the prototype as we don't need it (const struct +NXMapTablePrototype *prototype)
bool success = true;
if (load_addr == LLDB_INVALID_ADDRESS)
success = false;
else
{
lldb::addr_t cursor = load_addr + m_process->GetAddressByteSize();
// unsigned count;
m_count = m_process->ReadUnsignedIntegerFromMemory(cursor, unsigned_byte_size, 0, err);
if (m_count)
{
cursor += unsigned_byte_size;
// unsigned nbBucketsMinusOne;
m_num_buckets_minus_one = m_process->ReadUnsignedIntegerFromMemory(cursor, unsigned_byte_size, 0, err);
cursor += unsigned_byte_size;
// void *buckets;
m_buckets_ptr = m_process->ReadPointerFromMemory(cursor, err);
success = m_count > 0 && m_buckets_ptr != LLDB_INVALID_ADDRESS;
}
}
if (!success)
{
m_count = 0;
m_num_buckets_minus_one = 0;
m_buckets_ptr = LLDB_INVALID_ADDRESS;
}
return success;
}
// const_iterator mimics NXMapState and its code comes from NXInitMapState and NXNextMapState.
typedef std::pair<ConstString, ObjCLanguageRuntime::ObjCISA> element;
friend class const_iterator;
class const_iterator
{
public:
const_iterator (RemoteNXMapTable &parent, int index) : m_parent(parent), m_index(index)
{
AdvanceToValidIndex();
}
const_iterator (const const_iterator &rhs) : m_parent(rhs.m_parent), m_index(rhs.m_index)
{
// AdvanceToValidIndex() has been called by rhs already.
}
const_iterator &operator=(const const_iterator &rhs)
{
// AdvanceToValidIndex() has been called by rhs already.
assert (&m_parent == &rhs.m_parent);
m_index = rhs.m_index;
return *this;
}
bool operator==(const const_iterator &rhs) const
{
if (&m_parent != &rhs.m_parent)
return false;
if (m_index != rhs.m_index)
return false;
return true;
}
bool operator!=(const const_iterator &rhs) const
{
return !(operator==(rhs));
}
const_iterator &operator++()
{
AdvanceToValidIndex();
return *this;
}
const element operator*() const
{
if (m_index == -1)
{
// TODO find a way to make this an error, but not an assert
return element();
}
lldb::addr_t pairs_ptr = m_parent.m_buckets_ptr;
size_t map_pair_size = m_parent.m_map_pair_size;
lldb::addr_t pair_ptr = pairs_ptr + (m_index * map_pair_size);
Error err;
lldb::addr_t key = m_parent.m_process->ReadPointerFromMemory(pair_ptr, err);
if (!err.Success())
return element();
lldb::addr_t value = m_parent.m_process->ReadPointerFromMemory(pair_ptr + m_parent.m_process->GetAddressByteSize(), err);
if (!err.Success())
return element();
std::string key_string;
m_parent.m_process->ReadCStringFromMemory(key, key_string, err);
if (!err.Success())
return element();
return element(ConstString(key_string.c_str()), (ObjCLanguageRuntime::ObjCISA)value);
}
private:
void AdvanceToValidIndex ()
{
if (m_index == -1)
return;
const lldb::addr_t pairs_ptr = m_parent.m_buckets_ptr;
const size_t map_pair_size = m_parent.m_map_pair_size;
const lldb::addr_t invalid_key = m_parent.m_invalid_key;
Error err;
while (m_index--)
{
lldb::addr_t pair_ptr = pairs_ptr + (m_index * map_pair_size);
lldb::addr_t key = m_parent.m_process->ReadPointerFromMemory(pair_ptr, err);
if (!err.Success())
{
m_index = -1;
return;
}
if (key != invalid_key)
return;
}
}
RemoteNXMapTable &m_parent;
int m_index;
};
const_iterator begin ()
{
return const_iterator(*this, m_num_buckets_minus_one + 1);
}
const_iterator end ()
{
return m_end_iterator;
}
uint32_t
GetCount () const
{
return m_count;
}
uint32_t
GetBucketCount () const
{
return m_num_buckets_minus_one;
}
lldb::addr_t
GetBucketDataPointer () const
{
return m_buckets_ptr;
}
lldb::addr_t
GetTableLoadAddress() const
{
return m_load_addr;
}
private:
// contents of _NXMapTable struct
uint32_t m_count;
uint32_t m_num_buckets_minus_one;
lldb::addr_t m_buckets_ptr;
lldb_private::Process *m_process;
const_iterator m_end_iterator;
lldb::addr_t m_load_addr;
size_t m_map_pair_size;
lldb::addr_t m_invalid_key;
};
AppleObjCRuntimeV2::HashTableSignature::HashTableSignature() :
m_count (0),
m_num_buckets (0),
m_buckets_ptr (0)
{
}
void
AppleObjCRuntimeV2::HashTableSignature::UpdateSignature (const RemoteNXMapTable &hash_table)
{
m_count = hash_table.GetCount();
m_num_buckets = hash_table.GetBucketCount();
m_buckets_ptr = hash_table.GetBucketDataPointer();
}
bool
AppleObjCRuntimeV2::HashTableSignature::NeedsUpdate (Process *process, AppleObjCRuntimeV2 *runtime, RemoteNXMapTable &hash_table)
{
if (!hash_table.ParseHeader(process, runtime->GetISAHashTablePointer ()))
{
return false; // Failed to parse the header, no need to update anything
}
// Check with out current signature and return true if the count,
// number of buckets or the hash table address changes.
if (m_count == hash_table.GetCount() &&
m_num_buckets == hash_table.GetBucketCount() &&
m_buckets_ptr == hash_table.GetBucketDataPointer())
{
// Hash table hasn't changed
return false;
}
// Hash table data has changed, we need to update
return true;
}
class ClassDescriptorV2 : public ObjCLanguageRuntime::ClassDescriptor
{
public:
friend class lldb_private::AppleObjCRuntimeV2;
private:
// The constructor should only be invoked by the runtime as it builds its caches
// or populates them. A ClassDescriptorV2 should only ever exist in a cache.
ClassDescriptorV2 (AppleObjCRuntimeV2 &runtime, ObjCLanguageRuntime::ObjCISA isa, const char *name) :
m_runtime (runtime),
m_objc_class_ptr (isa),
m_name (name)
{
}
public:
virtual ConstString
GetClassName ()
{
if (!m_name)
{
lldb_private::Process *process = m_runtime.GetProcess();
if (process)
{
std::unique_ptr<objc_class_t> objc_class;
std::unique_ptr<class_ro_t> class_ro;
std::unique_ptr<class_rw_t> class_rw;
if (!Read_objc_class(process, objc_class))
return m_name;
if (!Read_class_row(process, *objc_class, class_ro, class_rw))
return m_name;
m_name = ConstString(class_ro->m_name.c_str());
}
}
return m_name;
}
virtual ObjCLanguageRuntime::ClassDescriptorSP
GetSuperclass ()
{
lldb_private::Process *process = m_runtime.GetProcess();
if (!process)
return ObjCLanguageRuntime::ClassDescriptorSP();
std::unique_ptr<objc_class_t> objc_class;
if (!Read_objc_class(process, objc_class))
return ObjCLanguageRuntime::ClassDescriptorSP();
return m_runtime.ObjCLanguageRuntime::GetClassDescriptorFromISA(objc_class->m_superclass);
}
virtual bool
IsValid ()
{
return true; // any Objective-C v2 runtime class descriptor we vend is valid
}
// a custom descriptor is used for tagged pointers
virtual bool
GetTaggedPointerInfo (uint64_t* info_bits = NULL,
uint64_t* value_bits = NULL,
uint64_t* payload = NULL)
{
return false;
}
virtual uint64_t
GetInstanceSize ()
{
lldb_private::Process *process = m_runtime.GetProcess();
if (process)
{
std::unique_ptr<objc_class_t> objc_class;
std::unique_ptr<class_ro_t> class_ro;
std::unique_ptr<class_rw_t> class_rw;
if (!Read_objc_class(process, objc_class))
return 0;
if (!Read_class_row(process, *objc_class, class_ro, class_rw))
return 0;
return class_ro->m_instanceSize;
}
return 0;
}
virtual ObjCLanguageRuntime::ObjCISA
GetISA ()
{
return m_objc_class_ptr;
}
virtual bool
Describe (std::function <void (ObjCLanguageRuntime::ObjCISA)> const &superclass_func,
std::function <bool (const char *, const char *)> const &instance_method_func,
std::function <bool (const char *, const char *)> const &class_method_func,
std::function <bool (const char *, const char *, lldb::addr_t, uint64_t)> const &ivar_func)
{
lldb_private::Process *process = m_runtime.GetProcess();
std::unique_ptr<objc_class_t> objc_class;
std::unique_ptr<class_ro_t> class_ro;
std::unique_ptr<class_rw_t> class_rw;
if (!Read_objc_class(process, objc_class))
return 0;
if (!Read_class_row(process, *objc_class, class_ro, class_rw))
return 0;
static ConstString NSObject_name("NSObject");
if (m_name != NSObject_name && superclass_func)
superclass_func(objc_class->m_superclass);
if (instance_method_func)
{
std::unique_ptr<method_list_t> base_method_list;
base_method_list.reset(new method_list_t);
if (!base_method_list->Read(process, class_ro->m_baseMethods_ptr))
return false;
if (base_method_list->m_entsize != method_t::GetSize(process))
return false;
std::unique_ptr<method_t> method;
method.reset(new method_t);
for (uint32_t i = 0, e = base_method_list->m_count; i < e; ++i)
{
method->Read(process, base_method_list->m_first_ptr + (i * base_method_list->m_entsize));
if (instance_method_func(method->m_name.c_str(), method->m_types.c_str()))
break;
}
}
if (class_method_func)
{
ClassDescriptorV2 metaclass(m_runtime, objc_class->m_isa, NULL); // The metaclass is not in the cache
// We don't care about the metaclass's superclass, or its class methods. Its instance methods are
// our class methods.
metaclass.Describe(std::function <void (ObjCLanguageRuntime::ObjCISA)> (nullptr),
class_method_func,
std::function <bool (const char *, const char *)> (nullptr),
std::function <bool (const char *, const char *, lldb::addr_t, uint64_t)> (nullptr));
}
if (ivar_func)
{
ivar_list_t ivar_list;
if (!ivar_list.Read(process, class_ro->m_ivars_ptr))
return false;
if (ivar_list.m_entsize != ivar_t::GetSize(process))
return false;
ivar_t ivar;
for (uint32_t i = 0, e = ivar_list.m_count; i < e; ++i)
{
ivar.Read(process, ivar_list.m_first_ptr + (i * ivar_list.m_entsize));
if (ivar_func(ivar.m_name.c_str(), ivar.m_type.c_str(), ivar.m_offset_ptr, ivar.m_size))
break;
}
}
return true;
}
virtual
~ClassDescriptorV2 ()
{
}
private:
static const uint32_t RW_REALIZED = (1 << 31);
struct objc_class_t {
ObjCLanguageRuntime::ObjCISA m_isa; // The class's metaclass.
ObjCLanguageRuntime::ObjCISA m_superclass;
lldb::addr_t m_cache_ptr;
lldb::addr_t m_vtable_ptr;
lldb::addr_t m_data_ptr;
uint8_t m_flags;
objc_class_t () :
m_isa (0),
m_superclass (0),
m_cache_ptr (0),
m_vtable_ptr (0),
m_data_ptr (0),
m_flags (0)
{
}
void
Clear()
{
m_isa = 0;
m_superclass = 0;
m_cache_ptr = 0;
m_vtable_ptr = 0;
m_data_ptr = 0;
m_flags = 0;
}
bool Read(Process *process, lldb::addr_t addr)
{
size_t ptr_size = process->GetAddressByteSize();
size_t objc_class_size = ptr_size // uintptr_t isa;
+ ptr_size // Class superclass;
+ ptr_size // void *cache;
+ ptr_size // IMP *vtable;
+ ptr_size; // uintptr_t data_NEVER_USE;
DataBufferHeap objc_class_buf (objc_class_size, '\0');
Error error;
process->ReadMemory(addr, objc_class_buf.GetBytes(), objc_class_size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(objc_class_buf.GetBytes(), objc_class_size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_isa = extractor.GetAddress_unchecked(&cursor); // uintptr_t isa;
m_superclass = extractor.GetAddress_unchecked(&cursor); // Class superclass;
m_cache_ptr = extractor.GetAddress_unchecked(&cursor); // void *cache;
m_vtable_ptr = extractor.GetAddress_unchecked(&cursor); // IMP *vtable;
lldb::addr_t data_NEVER_USE = extractor.GetAddress_unchecked(&cursor); // uintptr_t data_NEVER_USE;
m_flags = (uint8_t)(data_NEVER_USE & (lldb::addr_t)3);
m_data_ptr = data_NEVER_USE & ~(lldb::addr_t)3;
return true;
}
};
struct class_ro_t {
uint32_t m_flags;
uint32_t m_instanceStart;
uint32_t m_instanceSize;
uint32_t m_reserved;
lldb::addr_t m_ivarLayout_ptr;
lldb::addr_t m_name_ptr;
lldb::addr_t m_baseMethods_ptr;
lldb::addr_t m_baseProtocols_ptr;
lldb::addr_t m_ivars_ptr;
lldb::addr_t m_weakIvarLayout_ptr;
lldb::addr_t m_baseProperties_ptr;
std::string m_name;
bool Read(Process *process, lldb::addr_t addr)
{
size_t ptr_size = process->GetAddressByteSize();
size_t size = sizeof(uint32_t) // uint32_t flags;
+ sizeof(uint32_t) // uint32_t instanceStart;
+ sizeof(uint32_t) // uint32_t instanceSize;
+ (ptr_size == 8 ? sizeof(uint32_t) : 0) // uint32_t reserved; // __LP64__ only
+ ptr_size // const uint8_t *ivarLayout;
+ ptr_size // const char *name;
+ ptr_size // const method_list_t *baseMethods;
+ ptr_size // const protocol_list_t *baseProtocols;
+ ptr_size // const ivar_list_t *ivars;
+ ptr_size // const uint8_t *weakIvarLayout;
+ ptr_size; // const property_list_t *baseProperties;
DataBufferHeap buffer (size, '\0');
Error error;
process->ReadMemory(addr, buffer.GetBytes(), size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_flags = extractor.GetU32_unchecked(&cursor);
m_instanceStart = extractor.GetU32_unchecked(&cursor);
m_instanceSize = extractor.GetU32_unchecked(&cursor);
if (ptr_size == 8)
m_reserved = extractor.GetU32_unchecked(&cursor);
else
m_reserved = 0;
m_ivarLayout_ptr = extractor.GetAddress_unchecked(&cursor);
m_name_ptr = extractor.GetAddress_unchecked(&cursor);
m_baseMethods_ptr = extractor.GetAddress_unchecked(&cursor);
m_baseProtocols_ptr = extractor.GetAddress_unchecked(&cursor);
m_ivars_ptr = extractor.GetAddress_unchecked(&cursor);
m_weakIvarLayout_ptr = extractor.GetAddress_unchecked(&cursor);
m_baseProperties_ptr = extractor.GetAddress_unchecked(&cursor);
DataBufferHeap name_buf(1024, '\0');
process->ReadCStringFromMemory(m_name_ptr, (char*)name_buf.GetBytes(), name_buf.GetByteSize(), error);
if (error.Fail())
{
return false;
}
m_name.assign((char*)name_buf.GetBytes());
return true;
}
};
struct class_rw_t {
uint32_t m_flags;
uint32_t m_version;
lldb::addr_t m_ro_ptr;
union {
lldb::addr_t m_method_list_ptr;
lldb::addr_t m_method_lists_ptr;
};
lldb::addr_t m_properties_ptr;
lldb::addr_t m_protocols_ptr;
ObjCLanguageRuntime::ObjCISA m_firstSubclass;
ObjCLanguageRuntime::ObjCISA m_nextSiblingClass;
bool Read(Process *process, lldb::addr_t addr)
{
size_t ptr_size = process->GetAddressByteSize();
size_t size = sizeof(uint32_t) // uint32_t flags;
+ sizeof(uint32_t) // uint32_t version;
+ ptr_size // const class_ro_t *ro;
+ ptr_size // union { method_list_t **method_lists; method_list_t *method_list; };
+ ptr_size // struct chained_property_list *properties;
+ ptr_size // const protocol_list_t **protocols;
+ ptr_size // Class firstSubclass;
+ ptr_size; // Class nextSiblingClass;
DataBufferHeap buffer (size, '\0');
Error error;
process->ReadMemory(addr, buffer.GetBytes(), size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_flags = extractor.GetU32_unchecked(&cursor);
m_version = extractor.GetU32_unchecked(&cursor);
m_ro_ptr = extractor.GetAddress_unchecked(&cursor);
m_method_list_ptr = extractor.GetAddress_unchecked(&cursor);
m_properties_ptr = extractor.GetAddress_unchecked(&cursor);
m_firstSubclass = extractor.GetAddress_unchecked(&cursor);
m_nextSiblingClass = extractor.GetAddress_unchecked(&cursor);
return true;
}
};
struct method_list_t
{
uint32_t m_entsize;
uint32_t m_count;
lldb::addr_t m_first_ptr;
bool Read(Process *process, lldb::addr_t addr)
{
size_t size = sizeof(uint32_t) // uint32_t entsize_NEVER_USE;
+ sizeof(uint32_t); // uint32_t count;
DataBufferHeap buffer (size, '\0');
Error error;
process->ReadMemory(addr, buffer.GetBytes(), size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_entsize = extractor.GetU32_unchecked(&cursor) & ~(uint32_t)3;
m_count = extractor.GetU32_unchecked(&cursor);
m_first_ptr = addr + cursor;
return true;
}
};
struct method_t
{
lldb::addr_t m_name_ptr;
lldb::addr_t m_types_ptr;
lldb::addr_t m_imp_ptr;
std::string m_name;
std::string m_types;
static size_t GetSize(Process *process)
{
size_t ptr_size = process->GetAddressByteSize();
return ptr_size // SEL name;
+ ptr_size // const char *types;
+ ptr_size; // IMP imp;
}
bool Read(Process *process, lldb::addr_t addr)
{
size_t size = GetSize(process);
DataBufferHeap buffer (size, '\0');
Error error;
process->ReadMemory(addr, buffer.GetBytes(), size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_name_ptr = extractor.GetAddress_unchecked(&cursor);
m_types_ptr = extractor.GetAddress_unchecked(&cursor);
m_imp_ptr = extractor.GetAddress_unchecked(&cursor);
const size_t buffer_size = 1024;
size_t count;
DataBufferHeap string_buf(buffer_size, 0);
count = process->ReadCStringFromMemory(m_name_ptr, (char*)string_buf.GetBytes(), buffer_size, error);
m_name.assign((char*)string_buf.GetBytes(), count);
count = process->ReadCStringFromMemory(m_types_ptr, (char*)string_buf.GetBytes(), buffer_size, error);
m_types.assign((char*)string_buf.GetBytes(), count);
return true;
}
};
struct ivar_list_t
{
uint32_t m_entsize;
uint32_t m_count;
lldb::addr_t m_first_ptr;
bool Read(Process *process, lldb::addr_t addr)
{
size_t size = sizeof(uint32_t) // uint32_t entsize;
+ sizeof(uint32_t); // uint32_t count;
DataBufferHeap buffer (size, '\0');
Error error;
process->ReadMemory(addr, buffer.GetBytes(), size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_entsize = extractor.GetU32_unchecked(&cursor);
m_count = extractor.GetU32_unchecked(&cursor);
m_first_ptr = addr + cursor;
return true;
}
};
struct ivar_t
{
lldb::addr_t m_offset_ptr;
lldb::addr_t m_name_ptr;
lldb::addr_t m_type_ptr;
uint32_t m_alignment;
uint32_t m_size;
std::string m_name;
std::string m_type;
static size_t GetSize(Process *process)
{
size_t ptr_size = process->GetAddressByteSize();
return ptr_size // uintptr_t *offset;
+ ptr_size // const char *name;
+ ptr_size // const char *type;
+ sizeof(uint32_t) // uint32_t alignment;
+ sizeof(uint32_t); // uint32_t size;
}
bool Read(Process *process, lldb::addr_t addr)
{
size_t size = GetSize(process);
DataBufferHeap buffer (size, '\0');
Error error;
process->ReadMemory(addr, buffer.GetBytes(), size, error);
if (error.Fail())
{
return false;
}
DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(), process->GetAddressByteSize());
lldb::offset_t cursor = 0;
m_offset_ptr = extractor.GetAddress_unchecked(&cursor);
m_name_ptr = extractor.GetAddress_unchecked(&cursor);
m_type_ptr = extractor.GetAddress_unchecked(&cursor);
m_alignment = extractor.GetU32_unchecked(&cursor);
m_size = extractor.GetU32_unchecked(&cursor);
const size_t buffer_size = 1024;
size_t count;
DataBufferHeap string_buf(buffer_size, 0);
count = process->ReadCStringFromMemory(m_name_ptr, (char*)string_buf.GetBytes(), buffer_size, error);
m_name.assign((char*)string_buf.GetBytes(), count);
count = process->ReadCStringFromMemory(m_type_ptr, (char*)string_buf.GetBytes(), buffer_size, error);
m_type.assign((char*)string_buf.GetBytes(), count);
return true;
}
};
bool Read_objc_class (Process* process, std::unique_ptr<objc_class_t> &objc_class)
{
objc_class.reset(new objc_class_t);
bool ret = objc_class->Read (process, m_objc_class_ptr);
if (!ret)
objc_class.reset();
return ret;
}
bool Read_class_row (Process* process, const objc_class_t &objc_class, std::unique_ptr<class_ro_t> &class_ro, std::unique_ptr<class_rw_t> &class_rw)
{
class_ro.reset();
class_rw.reset();
Error error;
uint32_t class_row_t_flags = process->ReadUnsignedIntegerFromMemory(objc_class.m_data_ptr, sizeof(uint32_t), 0, error);
if (!error.Success())
return false;
if (class_row_t_flags & RW_REALIZED)
{
class_rw.reset(new class_rw_t);
if (!class_rw->Read(process, objc_class.m_data_ptr))
{
class_rw.reset();
return false;
}
class_ro.reset(new class_ro_t);
if (!class_ro->Read(process, class_rw->m_ro_ptr))
{
class_rw.reset();
class_ro.reset();
return false;
}
}
else
{
class_ro.reset(new class_ro_t);
if (!class_ro->Read(process, objc_class.m_data_ptr))
{
class_ro.reset();
return false;
}
}
return true;
}
AppleObjCRuntimeV2 &m_runtime; // The runtime, so we can read information lazily.
lldb::addr_t m_objc_class_ptr; // The address of the objc_class_t. (I.e., objects of this class type have this as their ISA)
ConstString m_name; // May be NULL
};
// tagged pointer descriptor
class ClassDescriptorV2Tagged : public ObjCLanguageRuntime::ClassDescriptor
{
public:
ClassDescriptorV2Tagged (ConstString class_name,
uint64_t payload)
{
m_name = class_name;
if (!m_name)
{
m_valid = false;
return;
}
m_valid = true;
m_payload = payload;
m_info_bits = (m_payload & 0xF0ULL) >> 4;
m_value_bits = (m_payload & ~0x0000000000000000FFULL) >> 8;
}
ClassDescriptorV2Tagged (ObjCLanguageRuntime::ClassDescriptorSP actual_class_sp,
uint64_t payload)
{
if (!actual_class_sp)
{
m_valid = false;
return;
}
m_name = actual_class_sp->GetClassName();
if (!m_name)
{
m_valid = false;
return;
}
m_valid = true;
m_payload = payload;
m_info_bits = (m_payload & 0x0FULL);
m_value_bits = (m_payload & ~0x0FULL) >> 4;
}
virtual ConstString
GetClassName ()
{
return m_name;
}
virtual ObjCLanguageRuntime::ClassDescriptorSP
GetSuperclass ()
{
// tagged pointers can represent a class that has a superclass, but since that information is not
// stored in the object itself, we would have to query the runtime to discover the hierarchy
// for the time being, we skip this step in the interest of static discovery
return ObjCLanguageRuntime::ClassDescriptorSP();
}
virtual bool
IsValid ()
{
return m_valid;
}
virtual bool
IsKVO ()
{
return false; // tagged pointers are not KVO'ed
}
virtual bool
IsCFType ()
{
return false; // tagged pointers are not CF objects
}
virtual bool
GetTaggedPointerInfo (uint64_t* info_bits = NULL,
uint64_t* value_bits = NULL,
uint64_t* payload = NULL)
{
if (info_bits)
*info_bits = GetInfoBits();
if (value_bits)
*value_bits = GetValueBits();
if (payload)
*payload = GetPayload();
return true;
}
virtual uint64_t
GetInstanceSize ()
{
return (IsValid() ? m_pointer_size : 0);
}
virtual ObjCLanguageRuntime::ObjCISA
GetISA ()
{
return 0; // tagged pointers have no ISA
}
// these calls are not part of any formal tagged pointers specification
virtual uint64_t
GetValueBits ()
{
return (IsValid() ? m_value_bits : 0);
}
virtual uint64_t
GetInfoBits ()
{
return (IsValid() ? m_info_bits : 0);
}
virtual uint64_t
GetPayload ()
{
return (IsValid() ? m_payload : 0);
}
virtual
~ClassDescriptorV2Tagged ()
{}
private:
ConstString m_name;
uint8_t m_pointer_size;
bool m_valid;
uint64_t m_info_bits;
uint64_t m_value_bits;
uint64_t m_payload;
};
ObjCLanguageRuntime::ClassDescriptorSP
AppleObjCRuntimeV2::GetClassDescriptorFromISA (ObjCISA isa)
{
ObjCLanguageRuntime::ClassDescriptorSP class_descriptor_sp;
if (m_non_pointer_isa_cache_ap.get())
class_descriptor_sp = m_non_pointer_isa_cache_ap->GetClassDescriptor(isa);
if (!class_descriptor_sp)
class_descriptor_sp = ObjCLanguageRuntime::GetClassDescriptorFromISA(isa);
return class_descriptor_sp;
}
ObjCLanguageRuntime::ClassDescriptorSP
AppleObjCRuntimeV2::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.GetClangType().IsValid())
{
addr_t isa_pointer = valobj.GetPointerValue();
// tagged pointer
if (IsTaggedPointer(isa_pointer))
{
return m_tagged_pointer_vendor_ap->GetClassDescriptor(isa_pointer);
}
else
{
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);
if (isa && !objc_class_sp)
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
if (log)
log->Printf("0x%" PRIx64 ": AppleObjCRuntimeV2::GetClassDescriptor() ISA was not in class descriptor cache 0x%" PRIx64,
isa_pointer,
isa);
}
}
}
}
}
return objc_class_sp;
}
lldb::addr_t
AppleObjCRuntimeV2::GetISAHashTablePointer ()
{
if (m_isa_hash_table_ptr == LLDB_INVALID_ADDRESS)
{
Process *process = GetProcess();
ModuleSP objc_module_sp(GetObjCModule());
if (!objc_module_sp)
return LLDB_INVALID_ADDRESS;
static ConstString g_gdb_objc_realized_classes("gdb_objc_realized_classes");
const Symbol *symbol = objc_module_sp->FindFirstSymbolWithNameAndType(g_gdb_objc_realized_classes, lldb::eSymbolTypeData);
if (symbol)
{
lldb::addr_t gdb_objc_realized_classes_ptr = symbol->GetAddress().GetLoadAddress(&process->GetTarget());
if (gdb_objc_realized_classes_ptr != LLDB_INVALID_ADDRESS)
{
Error error;
m_isa_hash_table_ptr = process->ReadPointerFromMemory(gdb_objc_realized_classes_ptr, error);
}
}
}
return m_isa_hash_table_ptr;
}
bool
AppleObjCRuntimeV2::UpdateISAToDescriptorMapDynamic(RemoteNXMapTable &hash_table)
{
Process *process = GetProcess();
if (process == NULL)
return false;
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
ExecutionContext exe_ctx;
ThreadSP thread_sp = process->GetThreadList().GetSelectedThread();
if (!thread_sp)
return false;
thread_sp->CalculateExecutionContext(exe_ctx);
ClangASTContext *ast = process->GetTarget().GetScratchClangASTContext();
if (!ast)
return false;
Address function_address;
StreamString errors;
const uint32_t addr_size = process->GetAddressByteSize();
Error err;
// Read the total number of classes from the hash table
const uint32_t num_classes = hash_table.GetCount();
if (num_classes == 0)
{
if (log)
log->Printf ("No dynamic classes found in gdb_objc_realized_classes.");
return false;
}
// Make some types for our arguments
ClangASTType clang_uint32_t_type = ast->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 32);
ClangASTType clang_void_pointer_type = ast->GetBasicType(eBasicTypeVoid).GetPointerType();
if (!m_get_class_info_code.get())
{
m_get_class_info_code.reset (new ClangUtilityFunction (g_get_dynamic_class_info_body,
g_get_dynamic_class_info_name));
errors.Clear();
if (!m_get_class_info_code->Install(errors, exe_ctx))
{
if (log)
log->Printf ("Failed to install implementation lookup: %s.", errors.GetData());
m_get_class_info_code.reset();
}
}
if (m_get_class_info_code.get())
function_address.SetOffset(m_get_class_info_code->StartAddress());
else
return false;
ValueList arguments;
// Next make the runner function for our implementation utility function.
if (!m_get_class_info_function.get())
{
Value value;
value.SetValueType (Value::eValueTypeScalar);
// value.SetContext (Value::eContextTypeClangType, clang_void_pointer_type);
value.SetClangType (clang_void_pointer_type);
arguments.PushValue (value);
arguments.PushValue (value);
value.SetValueType (Value::eValueTypeScalar);
// value.SetContext (Value::eContextTypeClangType, clang_uint32_t_type);
value.SetClangType (clang_uint32_t_type);
arguments.PushValue (value);
m_get_class_info_function.reset(new ClangFunction (*m_process,
clang_uint32_t_type,
function_address,
arguments,
"objc-v2-isa-to-descriptor"));
if (m_get_class_info_function.get() == NULL)
return false;
errors.Clear();
unsigned num_errors = m_get_class_info_function->CompileFunction(errors);
if (num_errors)
{
if (log)
log->Printf ("Error compiling function: \"%s\".", errors.GetData());
return false;
}
errors.Clear();
if (!m_get_class_info_function->WriteFunctionWrapper(exe_ctx, errors))
{
if (log)
log->Printf ("Error Inserting function: \"%s\".", errors.GetData());
return false;
}
}
else
{
arguments = m_get_class_info_function->GetArgumentValues ();
}
const uint32_t class_info_byte_size = addr_size + 4;
const uint32_t class_infos_byte_size = num_classes * class_info_byte_size;
lldb::addr_t class_infos_addr = process->AllocateMemory(class_infos_byte_size,
ePermissionsReadable | ePermissionsWritable,
err);
if (class_infos_addr == LLDB_INVALID_ADDRESS)
return false;
Mutex::Locker locker(m_get_class_info_args_mutex);
// Fill in our function argument values
arguments.GetValueAtIndex(0)->GetScalar() = hash_table.GetTableLoadAddress();
arguments.GetValueAtIndex(1)->GetScalar() = class_infos_addr;
arguments.GetValueAtIndex(2)->GetScalar() = class_infos_byte_size;
bool success = false;
errors.Clear();
// Write our function arguments into the process so we can run our function
if (m_get_class_info_function->WriteFunctionArguments (exe_ctx,
m_get_class_info_args,
function_address,
arguments,
errors))
{
EvaluateExpressionOptions options;
options.SetUnwindOnError(true);
options.SetTryAllThreads(false);
options.SetStopOthers(true);
options.SetIgnoreBreakpoints(true);
options.SetTimeoutUsec(UTILITY_FUNCTION_TIMEOUT_USEC);
Value return_value;
return_value.SetValueType (Value::eValueTypeScalar);
//return_value.SetContext (Value::eContextTypeClangType, clang_uint32_t_type);
return_value.SetClangType (clang_uint32_t_type);
return_value.GetScalar() = 0;
errors.Clear();
// Run the function
ExpressionResults results = m_get_class_info_function->ExecuteFunction (exe_ctx,
&m_get_class_info_args,
options,
errors,
return_value);
if (results == eExpressionCompleted)
{
// The result is the number of ClassInfo structures that were filled in
uint32_t num_class_infos = return_value.GetScalar().ULong();
if (log)
log->Printf("Discovered %u ObjC classes\n",num_class_infos);
if (num_class_infos > 0)
{
// Read the ClassInfo structures
DataBufferHeap buffer (num_class_infos * class_info_byte_size, 0);
if (process->ReadMemory(class_infos_addr, buffer.GetBytes(), buffer.GetByteSize(), err) == buffer.GetByteSize())
{
DataExtractor class_infos_data (buffer.GetBytes(),
buffer.GetByteSize(),
process->GetByteOrder(),
addr_size);
ParseClassInfoArray (class_infos_data, num_class_infos);
}
}
success = true;
}
else
{
if (log)
log->Printf("Error evaluating our find class name function: %s.\n", errors.GetData());
}
}
else
{
if (log)
log->Printf ("Error writing function arguments: \"%s\".", errors.GetData());
}
// Deallocate the memory we allocated for the ClassInfo array
process->DeallocateMemory(class_infos_addr);
return success;
}
void
AppleObjCRuntimeV2::ParseClassInfoArray (const DataExtractor &data, uint32_t num_class_infos)
{
// Parses an array of "num_class_infos" packed ClassInfo structures:
//
// struct ClassInfo
// {
// Class isa;
// uint32_t hash;
// } __attribute__((__packed__));
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
// Iterate through all ClassInfo structures
lldb::offset_t offset = 0;
for (uint32_t i=0; i<num_class_infos; ++i)
{
ObjCISA isa = data.GetPointer(&offset);
if (isa == 0)
{
if (log)
log->Printf("AppleObjCRuntimeV2 found NULL isa, ignoring this class info");
continue;
}
// Check if we already know about this ISA, if we do, the info will
// never change, so we can just skip it.
if (ISAIsCached(isa))
{
offset += 4;
}
else
{
// Read the 32 bit hash for the class name
const uint32_t name_hash = data.GetU32(&offset);
ClassDescriptorSP descriptor_sp (new ClassDescriptorV2(*this, isa, NULL));
AddClass (isa, descriptor_sp, name_hash);
if (log && log->GetVerbose())
log->Printf("AppleObjCRuntimeV2 added isa=0x%" PRIx64 ", hash=0x%8.8x", isa, name_hash);
}
}
}
bool
AppleObjCRuntimeV2::UpdateISAToDescriptorMapSharedCache()
{
Process *process = GetProcess();
if (process == NULL)
return false;
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
ExecutionContext exe_ctx;
ThreadSP thread_sp = process->GetThreadList().GetSelectedThread();
if (!thread_sp)
return false;
thread_sp->CalculateExecutionContext(exe_ctx);
ClangASTContext *ast = process->GetTarget().GetScratchClangASTContext();
if (!ast)
return false;
Address function_address;
StreamString errors;
const uint32_t addr_size = process->GetAddressByteSize();
Error err;
const lldb::addr_t objc_opt_ptr = GetSharedCacheReadOnlyAddress();
if (objc_opt_ptr == LLDB_INVALID_ADDRESS)
return false;
// Read the total number of classes from the hash table
const uint32_t num_classes = 16*1024;
if (num_classes == 0)
{
if (log)
log->Printf ("No dynamic classes found in gdb_objc_realized_classes_addr.");
return false;
}
// Make some types for our arguments
ClangASTType clang_uint32_t_type = ast->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 32);
ClangASTType clang_void_pointer_type = ast->GetBasicType(eBasicTypeVoid).GetPointerType();
if (!m_get_shared_cache_class_info_code.get())
{
m_get_shared_cache_class_info_code.reset (new ClangUtilityFunction (g_get_shared_cache_class_info_body,
g_get_shared_cache_class_info_name));
errors.Clear();
if (!m_get_shared_cache_class_info_code->Install(errors, exe_ctx))
{
if (log)
log->Printf ("Failed to install implementation lookup: %s.", errors.GetData());
m_get_shared_cache_class_info_code.reset();
}
}
if (m_get_shared_cache_class_info_code.get())
function_address.SetOffset(m_get_shared_cache_class_info_code->StartAddress());
else
return false;
ValueList arguments;
// Next make the runner function for our implementation utility function.
if (!m_get_shared_cache_class_info_function.get())
{
Value value;
value.SetValueType (Value::eValueTypeScalar);
//value.SetContext (Value::eContextTypeClangType, clang_void_pointer_type);
value.SetClangType (clang_void_pointer_type);
arguments.PushValue (value);
arguments.PushValue (value);
value.SetValueType (Value::eValueTypeScalar);
//value.SetContext (Value::eContextTypeClangType, clang_uint32_t_type);
value.SetClangType (clang_uint32_t_type);
arguments.PushValue (value);
m_get_shared_cache_class_info_function.reset(new ClangFunction (*m_process,
clang_uint32_t_type,
function_address,
arguments,
"objc-isa-to-descriptor-shared-cache"));
if (m_get_shared_cache_class_info_function.get() == NULL)
return false;
errors.Clear();
unsigned num_errors = m_get_shared_cache_class_info_function->CompileFunction(errors);
if (num_errors)
{
if (log)
log->Printf ("Error compiling function: \"%s\".", errors.GetData());
return false;
}
errors.Clear();
if (!m_get_shared_cache_class_info_function->WriteFunctionWrapper(exe_ctx, errors))
{
if (log)
log->Printf ("Error Inserting function: \"%s\".", errors.GetData());
return false;
}
}
else
{
arguments = m_get_shared_cache_class_info_function->GetArgumentValues ();
}
const uint32_t class_info_byte_size = addr_size + 4;
const uint32_t class_infos_byte_size = num_classes * class_info_byte_size;
lldb::addr_t class_infos_addr = process->AllocateMemory (class_infos_byte_size,
ePermissionsReadable | ePermissionsWritable,
err);
if (class_infos_addr == LLDB_INVALID_ADDRESS)
return false;
Mutex::Locker locker(m_get_shared_cache_class_info_args_mutex);
// Fill in our function argument values
arguments.GetValueAtIndex(0)->GetScalar() = objc_opt_ptr;
arguments.GetValueAtIndex(1)->GetScalar() = class_infos_addr;
arguments.GetValueAtIndex(2)->GetScalar() = class_infos_byte_size;
bool success = false;
errors.Clear();
// Write our function arguments into the process so we can run our function
if (m_get_shared_cache_class_info_function->WriteFunctionArguments (exe_ctx,
m_get_shared_cache_class_info_args,
function_address,
arguments,
errors))
{
EvaluateExpressionOptions options;
options.SetUnwindOnError(true);
options.SetTryAllThreads(false);
options.SetStopOthers(true);
options.SetIgnoreBreakpoints(true);
options.SetTimeoutUsec(UTILITY_FUNCTION_TIMEOUT_USEC);
Value return_value;
return_value.SetValueType (Value::eValueTypeScalar);
//return_value.SetContext (Value::eContextTypeClangType, clang_uint32_t_type);
return_value.SetClangType (clang_uint32_t_type);
return_value.GetScalar() = 0;
errors.Clear();
// Run the function
ExpressionResults results = m_get_shared_cache_class_info_function->ExecuteFunction (exe_ctx,
&m_get_shared_cache_class_info_args,
options,
errors,
return_value);
if (results == eExpressionCompleted)
{
// The result is the number of ClassInfo structures that were filled in
uint32_t num_class_infos = return_value.GetScalar().ULong();
if (log)
log->Printf("Discovered %u ObjC classes in shared cache\n",num_class_infos);
if (num_class_infos > 0)
{
// Read the ClassInfo structures
DataBufferHeap buffer (num_class_infos * class_info_byte_size, 0);
if (process->ReadMemory(class_infos_addr,
buffer.GetBytes(),
buffer.GetByteSize(),
err) == buffer.GetByteSize())
{
DataExtractor class_infos_data (buffer.GetBytes(),
buffer.GetByteSize(),
process->GetByteOrder(),
addr_size);
ParseClassInfoArray (class_infos_data, num_class_infos);
}
}
success = true;
}
else
{
if (log)
log->Printf("Error evaluating our find class name function: %s.\n", errors.GetData());
}
}
else
{
if (log)
log->Printf ("Error writing function arguments: \"%s\".", errors.GetData());
}
// Deallocate the memory we allocated for the ClassInfo array
process->DeallocateMemory(class_infos_addr);
return success;
}
bool
AppleObjCRuntimeV2::UpdateISAToDescriptorMapFromMemory (RemoteNXMapTable &hash_table)
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
Process *process = GetProcess();
if (process == NULL)
return false;
uint32_t num_map_table_isas = 0;
ModuleSP objc_module_sp(GetObjCModule());
if (objc_module_sp)
{
for (RemoteNXMapTable::element elt : hash_table)
{
++num_map_table_isas;
if (ISAIsCached(elt.second))
continue;
ClassDescriptorSP descriptor_sp = ClassDescriptorSP(new ClassDescriptorV2(*this, elt.second, elt.first.AsCString()));
if (log && log->GetVerbose())
log->Printf("AppleObjCRuntimeV2 added (ObjCISA)0x%" PRIx64 " (%s) from dynamic table to isa->descriptor cache", elt.second, elt.first.AsCString());
AddClass (elt.second, descriptor_sp, elt.first.AsCString());
}
}
return num_map_table_isas > 0;
}
lldb::addr_t
AppleObjCRuntimeV2::GetSharedCacheReadOnlyAddress()
{
Process *process = GetProcess();
if (process)
{
ModuleSP objc_module_sp(GetObjCModule());
if (objc_module_sp)
{
ObjectFile *objc_object = objc_module_sp->GetObjectFile();
if (objc_object)
{
SectionList *section_list = objc_module_sp->GetSectionList();
if (section_list)
{
SectionSP text_segment_sp (section_list->FindSectionByName(ConstString("__TEXT")));
if (text_segment_sp)
{
SectionSP objc_opt_section_sp (text_segment_sp->GetChildren().FindSectionByName(ConstString("__objc_opt_ro")));
if (objc_opt_section_sp)
{
return objc_opt_section_sp->GetLoadBaseAddress(&process->GetTarget());
}
}
}
}
}
}
return LLDB_INVALID_ADDRESS;
}
void
AppleObjCRuntimeV2::UpdateISAToDescriptorMapIfNeeded()
{
Timer scoped_timer (__PRETTY_FUNCTION__, __PRETTY_FUNCTION__);
// Else we need to check with our process to see when the map was updated.
Process *process = GetProcess();
if (process)
{
RemoteNXMapTable hash_table;
// Update the process stop ID that indicates the last time we updated the
// map, wether it was successful or not.
m_isa_to_descriptor_stop_id = process->GetStopID();
if (!m_hash_signature.NeedsUpdate(process, this, hash_table))
return;
m_hash_signature.UpdateSignature (hash_table);
// Grab the dynamicly loaded objc classes from the hash table in memory
UpdateISAToDescriptorMapDynamic(hash_table);
// Now get the objc classes that are baked into the Objective C runtime
// in the shared cache, but only once per process as this data never
// changes
if (!m_loaded_objc_opt)
UpdateISAToDescriptorMapSharedCache();
}
else
{
m_isa_to_descriptor_stop_id = UINT32_MAX;
}
}
// TODO: should we have a transparent_kvo parameter here to say if we
// want to replace the KVO swizzled class with the actual user-level type?
ConstString
AppleObjCRuntimeV2::GetActualTypeName(ObjCLanguageRuntime::ObjCISA isa)
{
if (isa == g_objc_Tagged_ISA)
{
static const ConstString g_objc_tagged_isa_name ("_lldb_Tagged_ObjC_ISA");
return g_objc_tagged_isa_name;
}
if (isa == g_objc_Tagged_ISA_NSAtom)
{
static const ConstString g_objc_tagged_isa_nsatom_name ("NSAtom");
return g_objc_tagged_isa_nsatom_name;
}
if (isa == g_objc_Tagged_ISA_NSNumber)
{
static const ConstString g_objc_tagged_isa_nsnumber_name ("NSNumber");
return g_objc_tagged_isa_nsnumber_name;
}
if (isa == g_objc_Tagged_ISA_NSDateTS)
{
static const ConstString g_objc_tagged_isa_nsdatets_name ("NSDateTS");
return g_objc_tagged_isa_nsdatets_name;
}
if (isa == g_objc_Tagged_ISA_NSManagedObject)
{
static const ConstString g_objc_tagged_isa_nsmanagedobject_name ("NSManagedObject");
return g_objc_tagged_isa_nsmanagedobject_name;
}
if (isa == g_objc_Tagged_ISA_NSDate)
{
static const ConstString g_objc_tagged_isa_nsdate_name ("NSDate");
return g_objc_tagged_isa_nsdate_name;
}
return ObjCLanguageRuntime::GetActualTypeName(isa);
}
TypeVendor *
AppleObjCRuntimeV2::GetTypeVendor()
{
if (!m_type_vendor_ap.get())
m_type_vendor_ap.reset(new AppleObjCTypeVendor(*this));
return m_type_vendor_ap.get();
}
lldb::addr_t
AppleObjCRuntimeV2::LookupRuntimeSymbol (const ConstString &name)
{
lldb::addr_t ret = LLDB_INVALID_ADDRESS;
const char *name_cstr = name.AsCString();
if (name_cstr)
{
llvm::StringRef name_strref(name_cstr);
static const llvm::StringRef ivar_prefix("OBJC_IVAR_$_");
static const llvm::StringRef class_prefix("OBJC_CLASS_$_");
if (name_strref.startswith(ivar_prefix))
{
llvm::StringRef ivar_skipped_prefix = name_strref.substr(ivar_prefix.size());
std::pair<llvm::StringRef, llvm::StringRef> class_and_ivar = ivar_skipped_prefix.split('.');
if (class_and_ivar.first.size() && class_and_ivar.second.size())
{
const ConstString class_name_cs(class_and_ivar.first);
ClassDescriptorSP descriptor = ObjCLanguageRuntime::GetClassDescriptorFromClassName(class_name_cs);
if (descriptor)
{
const ConstString ivar_name_cs(class_and_ivar.second);
const char *ivar_name_cstr = ivar_name_cs.AsCString();
auto ivar_func = [&ret, ivar_name_cstr](const char *name, const char *type, lldb::addr_t offset_addr, uint64_t size) -> lldb::addr_t
{
if (!strcmp(name, ivar_name_cstr))
{
ret = offset_addr;
return true;
}
return false;
};
descriptor->Describe(std::function<void (ObjCISA)>(nullptr),
std::function<bool (const char *, const char *)>(nullptr),
std::function<bool (const char *, const char *)>(nullptr),
ivar_func);
}
}
}
else if (name_strref.startswith(class_prefix))
{
llvm::StringRef class_skipped_prefix = name_strref.substr(class_prefix.size());
const ConstString class_name_cs(class_skipped_prefix);
ClassDescriptorSP descriptor = GetClassDescriptorFromClassName(class_name_cs);
if (descriptor)
ret = descriptor->GetISA();
}
}
return ret;
}
AppleObjCRuntimeV2::NonPointerISACache*
AppleObjCRuntimeV2::NonPointerISACache::CreateInstance (AppleObjCRuntimeV2& runtime, const lldb::ModuleSP& objc_module_sp)
{
Process* process(runtime.GetProcess());
Error error;
auto objc_debug_isa_magic_mask = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_isa_magic_mask"),
objc_module_sp,
error);
if (error.Fail())
return NULL;
auto objc_debug_isa_magic_value = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_isa_magic_value"),
objc_module_sp,
error);
if (error.Fail())
return NULL;
auto objc_debug_isa_class_mask = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_isa_class_mask"),
objc_module_sp,
error);
if (error.Fail())
return NULL;
// we might want to have some rules to outlaw these other values (e.g if the mask is zero but the value is non-zero, ...)
return new NonPointerISACache(runtime,
objc_debug_isa_class_mask,
objc_debug_isa_magic_mask,
objc_debug_isa_magic_value);
}
AppleObjCRuntimeV2::TaggedPointerVendor*
AppleObjCRuntimeV2::TaggedPointerVendor::CreateInstance (AppleObjCRuntimeV2& runtime, const lldb::ModuleSP& objc_module_sp)
{
Process* process(runtime.GetProcess());
Error error;
auto objc_debug_taggedpointer_mask = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_mask"),
objc_module_sp,
error);
if (error.Fail())
return new TaggedPointerVendorLegacy(runtime);
auto objc_debug_taggedpointer_slot_shift = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_slot_shift"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
return new TaggedPointerVendorLegacy(runtime);
auto objc_debug_taggedpointer_slot_mask = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_slot_mask"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
return new TaggedPointerVendorLegacy(runtime);
auto objc_debug_taggedpointer_payload_lshift = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_payload_lshift"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
return new TaggedPointerVendorLegacy(runtime);
auto objc_debug_taggedpointer_payload_rshift = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_payload_rshift"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
return new TaggedPointerVendorLegacy(runtime);
auto objc_debug_taggedpointer_classes = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_classes"),
objc_module_sp,
error,
false);
if (error.Fail())
return new TaggedPointerVendorLegacy(runtime);
// we might want to have some rules to outlaw these values (e.g if the table's address is zero)
return new TaggedPointerVendorRuntimeAssisted(runtime,
objc_debug_taggedpointer_mask,
objc_debug_taggedpointer_slot_shift,
objc_debug_taggedpointer_slot_mask,
objc_debug_taggedpointer_payload_lshift,
objc_debug_taggedpointer_payload_rshift,
objc_debug_taggedpointer_classes);
}
bool
AppleObjCRuntimeV2::TaggedPointerVendorLegacy::IsPossibleTaggedPointer (lldb::addr_t ptr)
{
return (ptr & 1);
}
ObjCLanguageRuntime::ClassDescriptorSP
AppleObjCRuntimeV2::TaggedPointerVendorLegacy::GetClassDescriptor (lldb::addr_t ptr)
{
if (!IsPossibleTaggedPointer(ptr))
return ObjCLanguageRuntime::ClassDescriptorSP();
uint32_t foundation_version = m_runtime.GetFoundationVersion();
if (foundation_version == LLDB_INVALID_MODULE_VERSION)
return ObjCLanguageRuntime::ClassDescriptorSP();
uint64_t class_bits = (ptr & 0xE) >> 1;
ConstString name;
// TODO: make a table
if (foundation_version >= 900)
{
switch (class_bits)
{
case 0:
name = ConstString("NSAtom");
break;
case 3:
name = ConstString("NSNumber");
break;
case 4:
name = ConstString("NSDateTS");
break;
case 5:
name = ConstString("NSManagedObject");
break;
case 6:
name = ConstString("NSDate");
break;
default:
return ObjCLanguageRuntime::ClassDescriptorSP();
}
}
else
{
switch (class_bits)
{
case 1:
name = ConstString("NSNumber");
break;
case 5:
name = ConstString("NSManagedObject");
break;
case 6:
name = ConstString("NSDate");
break;
case 7:
name = ConstString("NSDateTS");
break;
default:
return ObjCLanguageRuntime::ClassDescriptorSP();
}
}
return ClassDescriptorSP(new ClassDescriptorV2Tagged(name,ptr));
}
AppleObjCRuntimeV2::TaggedPointerVendorRuntimeAssisted::TaggedPointerVendorRuntimeAssisted (AppleObjCRuntimeV2& runtime,
uint64_t objc_debug_taggedpointer_mask,
uint32_t objc_debug_taggedpointer_slot_shift,
uint32_t objc_debug_taggedpointer_slot_mask,
uint32_t objc_debug_taggedpointer_payload_lshift,
uint32_t objc_debug_taggedpointer_payload_rshift,
lldb::addr_t objc_debug_taggedpointer_classes) :
TaggedPointerVendor(runtime),
m_cache(),
m_objc_debug_taggedpointer_mask(objc_debug_taggedpointer_mask),
m_objc_debug_taggedpointer_slot_shift(objc_debug_taggedpointer_slot_shift),
m_objc_debug_taggedpointer_slot_mask(objc_debug_taggedpointer_slot_mask),
m_objc_debug_taggedpointer_payload_lshift(objc_debug_taggedpointer_payload_lshift),
m_objc_debug_taggedpointer_payload_rshift(objc_debug_taggedpointer_payload_rshift),
m_objc_debug_taggedpointer_classes(objc_debug_taggedpointer_classes)
{
}
bool
AppleObjCRuntimeV2::TaggedPointerVendorRuntimeAssisted::IsPossibleTaggedPointer (lldb::addr_t ptr)
{
return (ptr & m_objc_debug_taggedpointer_mask) != 0;
}
ObjCLanguageRuntime::ClassDescriptorSP
AppleObjCRuntimeV2::TaggedPointerVendorRuntimeAssisted::GetClassDescriptor (lldb::addr_t ptr)
{
ClassDescriptorSP actual_class_descriptor_sp;
uint64_t data_payload;
if (!IsPossibleTaggedPointer(ptr))
return ObjCLanguageRuntime::ClassDescriptorSP();
uintptr_t slot = (ptr >> m_objc_debug_taggedpointer_slot_shift) & m_objc_debug_taggedpointer_slot_mask;
CacheIterator iterator = m_cache.find(slot),
end = m_cache.end();
if (iterator != end)
{
actual_class_descriptor_sp = iterator->second;
}
else
{
Process* process(m_runtime.GetProcess());
uintptr_t slot_ptr = slot*process->GetAddressByteSize()+m_objc_debug_taggedpointer_classes;
Error error;
uintptr_t slot_data = process->ReadPointerFromMemory(slot_ptr, error);
if (error.Fail() || slot_data == 0 || slot_data == uintptr_t(LLDB_INVALID_ADDRESS))
return nullptr;
actual_class_descriptor_sp = m_runtime.GetClassDescriptorFromISA((ObjCISA)slot_data);
if (!actual_class_descriptor_sp)
return ObjCLanguageRuntime::ClassDescriptorSP();
m_cache[slot] = actual_class_descriptor_sp;
}
data_payload = (((uint64_t)ptr << m_objc_debug_taggedpointer_payload_lshift) >> m_objc_debug_taggedpointer_payload_rshift);
return ClassDescriptorSP(new ClassDescriptorV2Tagged(actual_class_descriptor_sp,data_payload));
}
AppleObjCRuntimeV2::NonPointerISACache::NonPointerISACache (AppleObjCRuntimeV2& runtime,
uint64_t objc_debug_isa_class_mask,
uint64_t objc_debug_isa_magic_mask,
uint64_t objc_debug_isa_magic_value) :
m_runtime(runtime),
m_cache(),
m_objc_debug_isa_class_mask(objc_debug_isa_class_mask),
m_objc_debug_isa_magic_mask(objc_debug_isa_magic_mask),
m_objc_debug_isa_magic_value(objc_debug_isa_magic_value)
{
}
ObjCLanguageRuntime::ClassDescriptorSP
AppleObjCRuntimeV2::NonPointerISACache::GetClassDescriptor (ObjCISA isa)
{
ObjCISA real_isa = 0;
if (EvaluateNonPointerISA(isa, real_isa) == false)
return ObjCLanguageRuntime::ClassDescriptorSP();
auto cache_iter = m_cache.find(real_isa);
if (cache_iter != m_cache.end())
return cache_iter->second;
auto descriptor_sp = m_runtime.ObjCLanguageRuntime::GetClassDescriptorFromISA(real_isa);
if (descriptor_sp) // cache only positive matches since the table might grow
m_cache[real_isa] = descriptor_sp;
return descriptor_sp;
}
bool
AppleObjCRuntimeV2::NonPointerISACache::EvaluateNonPointerISA (ObjCISA isa, ObjCISA& ret_isa)
{
if ( (isa & ~m_objc_debug_isa_class_mask) == 0)
return false;
if ( (isa & m_objc_debug_isa_magic_mask) == m_objc_debug_isa_magic_value)
{
ret_isa = isa & m_objc_debug_isa_class_mask;
return (ret_isa != 0); // this is a pointer so 0 is not a valid value
}
return false;
}
Reference in New Issue View Git Blame Copy Permalink