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cc371201c3e1d1d76093b5894de202ec6fa1880f
clang-p2996/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
Saleem Abdulrasool 16ff860469 remove use of Mutex in favour of std::{,recursive_}mutex 
This is a pretty straightforward first pass over removing a number of uses of
Mutex in favor of std::mutex or std::recursive_mutex. The problem is that there
are interfaces which take Mutex::Locker & to lock internal locks. This patch
cleans up most of the easy cases. The only non-trivial change is in
CommandObjectTarget.cpp where a Mutex::Locker was split into two.

llvm-svn: 269877
2016-05-18 01:59:10 +00:00

2527 lines
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//===-- AppleObjCRuntimeV2.cpp ----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
#include <stdint.h>
// C++ Includes
#include <string>
#include <vector>
// Other libraries and framework includes
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
// Project includes
#include "lldb/lldb-enumerations.h"
#include "lldb/Core/ClangForward.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Core/ClangForward.h"
#include "lldb/Core/ConstString.h"
#include "lldb/Core/Debugger.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/Stream.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/ValueObjectVariable.h"
#include "lldb/Expression/DiagnosticManager.h"
#include "lldb/Expression/FunctionCaller.h"
#include "lldb/Expression/UtilityFunction.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Interpreter/CommandObject.h"
#include "lldb/Interpreter/CommandObjectMultiword.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/OptionValueBoolean.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/Platform.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 "AppleObjCClassDescriptorV2.h"
#include "AppleObjCTypeEncodingParser.h"
#include "AppleObjCDeclVendor.h"
#include "AppleObjCTrampolineHandler.h"
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 DEBUG_PRINTF(fmt, ...) if (should_log) printf(fmt, ## __VA_ARGS__)
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,
uint32_t should_log)
{
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 DEBUG_PRINTF(fmt, ...) if (should_log) printf(fmt, ## __VA_ARGS__)
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 objc_opt_v14_t {
uint32_t version;
uint32_t flags;
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 should_log)
{
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 (%llu class infos)\n", class_infos_byte_size, (uint64_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;
const objc_opt_v14_t* objc_opt_v14 = (objc_opt_v14_t*)objc_opt_ro_ptr;
const bool is_v14_format = objc_opt->version >= 14;
if (is_v14_format)
{
DEBUG_PRINTF ("objc_opt->version = %u\n", objc_opt_v14->version);
DEBUG_PRINTF ("objc_opt->flags = %u\n", objc_opt_v14->flags);
DEBUG_PRINTF ("objc_opt->selopt_offset = %d\n", objc_opt_v14->selopt_offset);
DEBUG_PRINTF ("objc_opt->headeropt_offset = %d\n", objc_opt_v14->headeropt_offset);
DEBUG_PRINTF ("objc_opt->clsopt_offset = %d\n", objc_opt_v14->clsopt_offset);
}
else
{
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 || objc_opt->version == 13 || objc_opt->version == 14 || objc_opt->version == 15)
{
const objc_clsopt_t* clsopt = NULL;
if (is_v14_format)
clsopt = (const objc_clsopt_t*)((uint8_t *)objc_opt_v14 + objc_opt_v14->clsopt_offset);
else
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);
DEBUG_PRINTF("max_class_infos = %llu\n", (uint64_t)max_class_infos);
ClassInfo *class_infos = (ClassInfo *)class_infos_ptr;
int32_t invalidEntryOffset = 0;
// this is safe to do because the version field order is invariant
if (objc_opt->version == 12)
invalidEntryOffset = 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);
DEBUG_PRINTF("invalidEntryOffset = %d\n", invalidEntryOffset);
for (uint32_t i=0; i<clsopt->capacity; ++i)
{
const int32_t clsOffset = classOffsets[i].clsOffset;
DEBUG_PRINTF("clsOffset[%u] = %u\n", i, clsOffset);
if (clsOffset & 1)
{
DEBUG_PRINTF("clsOffset & 1\n");
continue; // duplicate
}
else if (clsOffset == invalidEntryOffset)
{
DEBUG_PRINTF("clsOffset == invalidEntryOffset\n");
continue; // invalid 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;
}
else
{
DEBUG_PRINTF("not(class_infos && idx < max_class_infos)\n");
}
++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 == invalidEntryOffset)
continue; // invalid 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 && symbol->ValueIsAddress())
{
lldb::addr_t symbol_load_addr = symbol->GetAddressRef().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_code(),
m_get_class_info_args(LLDB_INVALID_ADDRESS),
m_get_class_info_args_mutex(),
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(),
m_decl_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(TaggedPointerVendorV2::CreateInstance(*this, objc_module_sp)),
m_encoding_to_type_sp(),
m_noclasses_warning_emitted(false)
{
static const ConstString g_gdb_object_getClass("gdb_object_getClass");
m_has_object_getClass =
(objc_module_sp->FindFirstSymbolWithNameAndType(g_gdb_object_getClass, eSymbolTypeCode) != NULL);
}
bool
AppleObjCRuntimeV2::GetDynamicTypeAndAddress (ValueObject &in_value,
DynamicValueType use_dynamic,
TypeAndOrName &class_type_or_name,
Address &address,
Value::ValueType &value_type)
{
// We should never get here with a null process...
assert (m_process != NULL);
// The Runtime is attached to a particular process, you shouldn't pass in a value from another process.
// Note, however, the process might be NULL (e.g. if the value was made with SBTarget::EvaluateExpression...)
// in which case it is sufficient if the target's match:
Process *process = in_value.GetProcessSP().get();
if (process)
assert (process == m_process);
else
assert (in_value.GetTargetSP().get() == m_process->CalculateTarget().get());
class_type_or_name.Clear();
value_type = Value::ValueType::eValueTypeScalar;
// 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 CompilerType at least
DeclVendor* vendor = GetDeclVendor();
if (vendor)
{
std::vector<clang::NamedDecl*> decls;
if (vendor->FindDecls(class_name, false, 1, decls) && decls.size())
class_type_or_name.SetCompilerType(ClangASTContext::GetTypeForDecl(decls[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) == ObjCRuntimeVersions::eAppleObjC_V2)
return new AppleObjCRuntimeV2 (process, objc_module_sp);
else
return NULL;
}
else
return NULL;
}
class CommandObjectObjC_ClassTable_Dump : public CommandObjectParsed
{
public:
class CommandOptions : public Options
{
public:
CommandOptions (CommandInterpreter &interpreter) :
Options(interpreter),
m_verbose(false,false)
{}
~CommandOptions() override = default;
Error
SetOptionValue(uint32_t option_idx, const char *option_arg) override
{
Error error;
const int short_option = m_getopt_table[option_idx].val;
switch (short_option)
{
case 'v':
m_verbose.SetCurrentValue(true);
m_verbose.SetOptionWasSet();
break;
default:
error.SetErrorStringWithFormat("unrecognized short option '%c'", short_option);
break;
}
return error;
}
void
OptionParsingStarting() override
{
m_verbose.Clear();
}
const OptionDefinition*
GetDefinitions() override
{
return g_option_table;
}
OptionValueBoolean m_verbose;
static OptionDefinition g_option_table[];
};
CommandObjectObjC_ClassTable_Dump (CommandInterpreter &interpreter) :
CommandObjectParsed (interpreter,
"dump",
"Dump information on Objective-C classes known to the current process.",
"language objc class-table dump",
eCommandRequiresProcess |
eCommandProcessMustBeLaunched |
eCommandProcessMustBePaused ),
m_options(interpreter)
{
CommandArgumentEntry arg;
CommandArgumentData index_arg;
// Define the first (and only) variant of this arg.
index_arg.arg_type = eArgTypeRegularExpression;
index_arg.arg_repetition = eArgRepeatOptional;
// There is only one variant this argument could be; put it into the argument entry.
arg.push_back (index_arg);
// Push the data for the first argument into the m_arguments vector.
m_arguments.push_back (arg);
}
~CommandObjectObjC_ClassTable_Dump() override = default;
Options *
GetOptions() override
{
return &m_options;
}
protected:
bool
DoExecute(Args& command, CommandReturnObject &result) override
{
std::unique_ptr<RegularExpression> regex_up;
switch(command.GetArgumentCount())
{
case 0:
break;
case 1:
{
regex_up.reset(new RegularExpression());
if (!regex_up->Compile(command.GetArgumentAtIndex(0)))
{
result.AppendError("invalid argument - please provide a valid regular expression");
result.SetStatus(lldb::eReturnStatusFailed);
return false;
}
break;
}
default:
{
result.AppendError("please provide 0 or 1 arguments");
result.SetStatus(lldb::eReturnStatusFailed);
return false;
}
}
Process *process = m_exe_ctx.GetProcessPtr();
ObjCLanguageRuntime *objc_runtime = process->GetObjCLanguageRuntime();
if (objc_runtime)
{
auto iterators_pair = objc_runtime->GetDescriptorIteratorPair();
auto iterator = iterators_pair.first;
auto &std_out = result.GetOutputStream();
for(; iterator != iterators_pair.second; iterator++)
{
if (iterator->second)
{
const char* class_name = iterator->second->GetClassName().AsCString("<unknown>");
if (regex_up && class_name && !regex_up->Execute(class_name))
continue;
std_out.Printf("isa = 0x%" PRIx64, iterator->first);
std_out.Printf(" name = %s", class_name);
std_out.Printf(" instance size = %" PRIu64, iterator->second->GetInstanceSize());
std_out.Printf(" num ivars = %" PRIuPTR, (uintptr_t)iterator->second->GetNumIVars());
if (auto superclass = iterator->second->GetSuperclass())
{
std_out.Printf(" superclass = %s", superclass->GetClassName().AsCString("<unknown>"));
}
std_out.Printf("\n");
if (m_options.m_verbose)
{
for(size_t i = 0;
i < iterator->second->GetNumIVars();
i++)
{
auto ivar = iterator->second->GetIVarAtIndex(i);
std_out.Printf(" ivar name = %s type = %s size = %" PRIu64 " offset = %" PRId32 "\n",
ivar.m_name.AsCString("<unknown>"),
ivar.m_type.GetDisplayTypeName().AsCString("<unknown>"),
ivar.m_size,
ivar.m_offset);
}
iterator->second->Describe(nullptr,
[objc_runtime, &std_out] (const char* name, const char* type) -> bool {
std_out.Printf(" instance method name = %s type = %s\n",
name,
type);
return false;
},
[objc_runtime, &std_out] (const char* name, const char* type) -> bool {
std_out.Printf(" class method name = %s type = %s\n",
name,
type);
return false;
},
nullptr);
}
}
else
{
if (regex_up && !regex_up->Execute(""))
continue;
std_out.Printf("isa = 0x%" PRIx64 " has no associated class.\n", iterator->first);
}
}
result.SetStatus(lldb::eReturnStatusSuccessFinishResult);
return true;
}
else
{
result.AppendError("current process has no Objective-C runtime loaded");
result.SetStatus(lldb::eReturnStatusFailed);
return false;
}
}
CommandOptions m_options;
};
OptionDefinition
CommandObjectObjC_ClassTable_Dump::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_ALL, false, "verbose" , 'v', OptionParser::eNoArgument , nullptr, nullptr, 0, eArgTypeNone, "Print ivar and method information in detail"},
{ 0 , false, nullptr , 0, 0 , nullptr, nullptr, 0, eArgTypeNone, nullptr }
};
class CommandObjectMultiwordObjC_TaggedPointer_Info : public CommandObjectParsed
{
public:
CommandObjectMultiwordObjC_TaggedPointer_Info (CommandInterpreter &interpreter) :
CommandObjectParsed (interpreter,
"info",
"Dump information on a tagged pointer.",
"language objc tagged-pointer info",
eCommandRequiresProcess |
eCommandProcessMustBeLaunched |
eCommandProcessMustBePaused )
{
CommandArgumentEntry arg;
CommandArgumentData index_arg;
// Define the first (and only) variant of this arg.
index_arg.arg_type = eArgTypeAddress;
index_arg.arg_repetition = eArgRepeatPlus;
// There is only one variant this argument could be; put it into the argument entry.
arg.push_back (index_arg);
// Push the data for the first argument into the m_arguments vector.
m_arguments.push_back (arg);
}
~CommandObjectMultiwordObjC_TaggedPointer_Info() override = default;
protected:
bool
DoExecute(Args& command, CommandReturnObject &result) override
{
if (command.GetArgumentCount() == 0)
{
result.AppendError("this command requires arguments");
result.SetStatus(lldb::eReturnStatusFailed);
return false;
}
Process *process = m_exe_ctx.GetProcessPtr();
ExecutionContext exe_ctx(process);
ObjCLanguageRuntime *objc_runtime = process->GetObjCLanguageRuntime();
if (objc_runtime)
{
ObjCLanguageRuntime::TaggedPointerVendor *tagged_ptr_vendor = objc_runtime->GetTaggedPointerVendor();
if (tagged_ptr_vendor)
{
for (size_t i = 0;
i < command.GetArgumentCount();
i++)
{
const char *arg_str = command.GetArgumentAtIndex(i);
if (!arg_str)
continue;
Error error;
lldb::addr_t arg_addr = Args::StringToAddress(&exe_ctx, arg_str, LLDB_INVALID_ADDRESS, &error);
if (arg_addr == 0 || arg_addr == LLDB_INVALID_ADDRESS || error.Fail())
continue;
auto descriptor_sp = tagged_ptr_vendor->GetClassDescriptor(arg_addr);
if (!descriptor_sp)
continue;
uint64_t info_bits = 0;
uint64_t value_bits = 0;
uint64_t payload = 0;
if (descriptor_sp->GetTaggedPointerInfo(&info_bits, &value_bits, &payload))
{
result.GetOutputStream().Printf("0x%" PRIx64 " is tagged.\n\tpayload = 0x%" PRIx64 "\n\tvalue = 0x%" PRIx64 "\n\tinfo bits = 0x%" PRIx64 "\n\tclass = %s\n",
(uint64_t)arg_addr,
payload,
value_bits,
info_bits,
descriptor_sp->GetClassName().AsCString("<unknown>"));
}
else
{
result.GetOutputStream().Printf("0x%" PRIx64 " is not tagged.\n", (uint64_t)arg_addr);
}
}
}
else
{
result.AppendError("current process has no tagged pointer support");
result.SetStatus(lldb::eReturnStatusFailed);
return false;
}
result.SetStatus(lldb::eReturnStatusSuccessFinishResult);
return true;
}
else
{
result.AppendError("current process has no Objective-C runtime loaded");
result.SetStatus(lldb::eReturnStatusFailed);
return false;
}
}
};
class CommandObjectMultiwordObjC_ClassTable : public CommandObjectMultiword
{
public:
CommandObjectMultiwordObjC_ClassTable (CommandInterpreter &interpreter) :
CommandObjectMultiword (interpreter,
"class-table",
"A set of commands for operating on the Objective-C class table.",
"class-table <subcommand> [<subcommand-options>]")
{
LoadSubCommand ("dump", CommandObjectSP (new CommandObjectObjC_ClassTable_Dump (interpreter)));
}
~CommandObjectMultiwordObjC_ClassTable() override = default;
};
class CommandObjectMultiwordObjC_TaggedPointer : public CommandObjectMultiword
{
public:
CommandObjectMultiwordObjC_TaggedPointer (CommandInterpreter &interpreter) :
CommandObjectMultiword (interpreter,
"tagged-pointer",
"A set of commands for operating on Objective-C tagged pointers.",
"class-table <subcommand> [<subcommand-options>]")
{
LoadSubCommand ("info", CommandObjectSP (new CommandObjectMultiwordObjC_TaggedPointer_Info (interpreter)));
}
~CommandObjectMultiwordObjC_TaggedPointer() override = default;
};
class CommandObjectMultiwordObjC : public CommandObjectMultiword
{
public:
CommandObjectMultiwordObjC (CommandInterpreter &interpreter) :
CommandObjectMultiword (interpreter,
"objc",
"A set of commands for operating on the Objective-C Language Runtime.",
"objc <subcommand> [<subcommand-options>]")
{
LoadSubCommand ("class-table", CommandObjectSP (new CommandObjectMultiwordObjC_ClassTable (interpreter)));
LoadSubCommand ("tagged-pointer", CommandObjectSP (new CommandObjectMultiwordObjC_TaggedPointer (interpreter)));
}
~CommandObjectMultiwordObjC() override = default;
};
void
AppleObjCRuntimeV2::Initialize()
{
PluginManager::RegisterPlugin (GetPluginNameStatic(),
"Apple Objective C Language Runtime - Version 2",
CreateInstance,
[] (CommandInterpreter& interpreter) -> lldb::CommandObjectSP {
return CommandObjectSP(new CommandObjectMultiwordObjC(interpreter));
});
}
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,
eLanguageTypeUnknown,
Breakpoint::Exact,
0,
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;
}
UtilityFunction *
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 *) $__lldb_arg_selector]; \n"
" if (responds == (signed char) 0) \n"
" *((volatile int *)0) = 'ocgc'; \n"
" } \n"
"} \n",
name);
}
assert (len < (int)sizeof(check_function_code));
Error error;
return GetTargetRef().GetUtilityFunctionForLanguage(check_function_code, eLanguageTypeObjC, name, error);
}
size_t
AppleObjCRuntimeV2::GetByteOffsetForIvar (CompilerType &parent_ast_type, const char *ivar_name)
{
uint32_t ivar_offset = LLDB_INVALID_IVAR_OFFSET;
const char *class_name = parent_ast_type.GetConstTypeName().AsCString();
if (class_name && class_name[0] && ivar_name && ivar_name[0])
{
//----------------------------------------------------------------------
// Make the objective C V2 mangled name for the ivar offset from the
// class name and ivar name
//----------------------------------------------------------------------
std::string buffer("OBJC_IVAR_$_");
buffer.append (class_name);
buffer.push_back ('.');
buffer.append (ivar_name);
ConstString ivar_const_str (buffer.c_str());
//----------------------------------------------------------------------
// Try to get the ivar offset address from the symbol table first using
// the name we created above
//----------------------------------------------------------------------
SymbolContextList sc_list;
Target &target = m_process->GetTarget();
target.GetImages().FindSymbolsWithNameAndType(ivar_const_str, eSymbolTypeObjCIVar, sc_list);
addr_t ivar_offset_address = LLDB_INVALID_ADDRESS;
Error error;
SymbolContext ivar_offset_symbol;
if (sc_list.GetSize() == 1 && sc_list.GetContextAtIndex(0, ivar_offset_symbol))
{
if (ivar_offset_symbol.symbol)
ivar_offset_address = ivar_offset_symbol.symbol->GetLoadAddress (&target);
}
//----------------------------------------------------------------------
// If we didn't get the ivar offset address from the symbol table, fall
// back to getting it from the runtime
//----------------------------------------------------------------------
if (ivar_offset_address == LLDB_INVALID_ADDRESS)
ivar_offset_address = LookupRuntimeSymbol(ivar_const_str);
if (ivar_offset_address != LLDB_INVALID_ADDRESS)
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 actually 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;
}
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 (valobj.IsBaseClass())
{
ValueObject *parent = valobj.GetParent();
// if I am my own parent, bail out of here fast..
if (parent && parent != &valobj)
{
ClassDescriptorSP parent_descriptor_sp = GetClassDescriptor(*parent);
if (parent_descriptor_sp)
return parent_descriptor_sp->GetSuperclass();
}
return nullptr;
}
// 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();
// 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::eSymbolTypeAny);
if (symbol)
{
lldb::addr_t gdb_objc_realized_classes_ptr = symbol->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().GetExpressionExecutionThread();
if (!thread_sp)
return false;
thread_sp->CalculateExecutionContext(exe_ctx);
ClangASTContext *ast = process->GetTarget().GetScratchClangASTContext();
if (!ast)
return false;
Address function_address;
DiagnosticManager diagnostics;
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
CompilerType clang_uint32_t_type = ast->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 32);
CompilerType clang_void_pointer_type = ast->GetBasicType(eBasicTypeVoid).GetPointerType();
ValueList arguments;
FunctionCaller *get_class_info_function = nullptr;
if (!m_get_class_info_code.get())
{
Error error;
m_get_class_info_code.reset (GetTargetRef().GetUtilityFunctionForLanguage (g_get_dynamic_class_info_body,
eLanguageTypeObjC,
g_get_dynamic_class_info_name,
error));
if (error.Fail())
{
if (log)
log->Printf ("Failed to get Utility Function for implementation lookup: %s", error.AsCString());
m_get_class_info_code.reset();
}
else
{
diagnostics.Clear();
if (!m_get_class_info_code->Install(diagnostics, exe_ctx))
{
if (log)
{
log->Printf("Failed to install implementation lookup");
diagnostics.Dump(log);
}
m_get_class_info_code.reset();
}
}
if (!m_get_class_info_code.get())
return false;
// Next make the runner function for our implementation utility function.
Value value;
value.SetValueType (Value::eValueTypeScalar);
value.SetCompilerType (clang_void_pointer_type);
arguments.PushValue (value);
arguments.PushValue (value);
value.SetValueType (Value::eValueTypeScalar);
value.SetCompilerType (clang_uint32_t_type);
arguments.PushValue (value);
arguments.PushValue (value);
get_class_info_function = m_get_class_info_code->MakeFunctionCaller(clang_uint32_t_type,
arguments,
thread_sp,
error);
if (error.Fail())
{
if (log)
log->Printf("Failed to make function caller for implementation lookup: %s.", error.AsCString());
return false;
}
}
else
{
get_class_info_function = m_get_class_info_code->GetFunctionCaller();
if (!get_class_info_function)
{
if (log)
{
log->Printf("Failed to get implementation lookup function caller.");
diagnostics.Dump(log);
}
return false;
}
arguments = get_class_info_function->GetArgumentValues();
}
diagnostics.Clear();
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;
std::lock_guard<std::mutex> guard(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;
arguments.GetValueAtIndex(3)->GetScalar() = (GetLogIfAllCategoriesSet(LIBLLDB_LOG_TYPES) == nullptr ? 0 : 1);
bool success = false;
diagnostics.Clear();
// Write our function arguments into the process so we can run our function
if (get_class_info_function->WriteFunctionArguments(exe_ctx, m_get_class_info_args, arguments, diagnostics))
{
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.SetCompilerType(clang_uint32_t_type);
return_value.GetScalar() = 0;
diagnostics.Clear();
// Run the function
ExpressionResults results = get_class_info_function->ExecuteFunction(exe_ctx, &m_get_class_info_args, options,
diagnostics, 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.");
diagnostics.Dump(log);
}
}
}
else
{
if (log)
{
log->Printf("Error writing function arguments.");
diagnostics.Dump(log);
}
}
// Deallocate the memory we allocated for the ClassInfo array
process->DeallocateMemory(class_infos_addr);
return success;
}
uint32_t
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));
uint32_t num_parsed = 0;
// 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);
num_parsed++;
if (log && log->GetVerbose())
log->Printf("AppleObjCRuntimeV2 added isa=0x%" PRIx64 ", hash=0x%8.8x, name=%s", isa, name_hash,descriptor_sp->GetClassName().AsCString("<unknown>"));
}
}
return num_parsed;
}
AppleObjCRuntimeV2::DescriptorMapUpdateResult
AppleObjCRuntimeV2::UpdateISAToDescriptorMapSharedCache()
{
Process *process = GetProcess();
if (process == NULL)
return DescriptorMapUpdateResult::Fail();
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
ExecutionContext exe_ctx;
ThreadSP thread_sp = process->GetThreadList().GetExpressionExecutionThread();
if (!thread_sp)
return DescriptorMapUpdateResult::Fail();
thread_sp->CalculateExecutionContext(exe_ctx);
ClangASTContext *ast = process->GetTarget().GetScratchClangASTContext();
if (!ast)
return DescriptorMapUpdateResult::Fail();
Address function_address;
DiagnosticManager diagnostics;
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 DescriptorMapUpdateResult::Fail();
// Read the total number of classes from the hash table
const uint32_t num_classes = 128*1024;
if (num_classes == 0)
{
if (log)
log->Printf ("No dynamic classes found in gdb_objc_realized_classes_addr.");
return DescriptorMapUpdateResult::Fail();
}
// Make some types for our arguments
CompilerType clang_uint32_t_type = ast->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 32);
CompilerType clang_void_pointer_type = ast->GetBasicType(eBasicTypeVoid).GetPointerType();
ValueList arguments;
FunctionCaller *get_shared_cache_class_info_function = nullptr;
if (!m_get_shared_cache_class_info_code.get())
{
Error error;
m_get_shared_cache_class_info_code.reset (GetTargetRef().GetUtilityFunctionForLanguage (g_get_shared_cache_class_info_body,
eLanguageTypeObjC,
g_get_shared_cache_class_info_name,
error));
if (error.Fail())
{
if (log)
log->Printf ("Failed to get Utility function for implementation lookup: %s.", error.AsCString());
m_get_shared_cache_class_info_code.reset();
}
else
{
diagnostics.Clear();
if (!m_get_shared_cache_class_info_code->Install(diagnostics, exe_ctx))
{
if (log)
{
log->Printf("Failed to install implementation lookup.");
diagnostics.Dump(log);
}
m_get_shared_cache_class_info_code.reset();
}
}
if (!m_get_shared_cache_class_info_code.get())
return DescriptorMapUpdateResult::Fail();
// Next make the function caller for our implementation utility function.
Value value;
value.SetValueType (Value::eValueTypeScalar);
//value.SetContext (Value::eContextTypeClangType, clang_void_pointer_type);
value.SetCompilerType (clang_void_pointer_type);
arguments.PushValue (value);
arguments.PushValue (value);
value.SetValueType (Value::eValueTypeScalar);
//value.SetContext (Value::eContextTypeClangType, clang_uint32_t_type);
value.SetCompilerType (clang_uint32_t_type);
arguments.PushValue (value);
arguments.PushValue (value);
get_shared_cache_class_info_function = m_get_shared_cache_class_info_code->MakeFunctionCaller(clang_uint32_t_type,
arguments,
thread_sp,
error);
if (get_shared_cache_class_info_function == nullptr)
return DescriptorMapUpdateResult::Fail();
}
else
{
get_shared_cache_class_info_function = m_get_shared_cache_class_info_code->GetFunctionCaller();
if (get_shared_cache_class_info_function == nullptr)
return DescriptorMapUpdateResult::Fail();
arguments = get_shared_cache_class_info_function->GetArgumentValues();
}
diagnostics.Clear();
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 DescriptorMapUpdateResult::Fail();
std::lock_guard<std::mutex> guard(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;
arguments.GetValueAtIndex(3)->GetScalar() = (GetLogIfAllCategoriesSet(LIBLLDB_LOG_TYPES) == nullptr ? 0 : 1);
bool success = false;
bool any_found = false;
diagnostics.Clear();
// Write our function arguments into the process so we can run our function
if (get_shared_cache_class_info_function->WriteFunctionArguments(exe_ctx, m_get_shared_cache_class_info_args,
arguments, diagnostics))
{
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.SetCompilerType(clang_uint32_t_type);
return_value.GetScalar() = 0;
diagnostics.Clear();
// Run the function
ExpressionResults results = get_shared_cache_class_info_function->ExecuteFunction(
exe_ctx, &m_get_shared_cache_class_info_args, options, diagnostics, 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);
#ifdef LLDB_CONFIGURATION_DEBUG
assert (num_class_infos <= num_classes);
#endif
if (num_class_infos > 0)
{
if (num_class_infos > num_classes)
{
num_class_infos = num_classes;
success = false;
}
else
{
success = true;
}
// 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);
any_found = (ParseClassInfoArray (class_infos_data, num_class_infos) > 0);
}
}
else
{
success = true;
}
}
else
{
if (log)
{
log->Printf("Error evaluating our find class name function.");
diagnostics.Dump(log);
}
}
}
else
{
if (log)
{
log->Printf("Error writing function arguments.");
diagnostics.Dump(log);
}
}
// Deallocate the memory we allocated for the ClassInfo array
process->DeallocateMemory(class_infos_addr);
return DescriptorMapUpdateResult(success, any_found);
}
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, whether 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 dynamically 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)
{
DescriptorMapUpdateResult shared_cache_update_result = UpdateISAToDescriptorMapSharedCache();
if (!shared_cache_update_result.any_found)
WarnIfNoClassesCached ();
else
m_loaded_objc_opt = true;
}
}
else
{
m_isa_to_descriptor_stop_id = UINT32_MAX;
}
}
void
AppleObjCRuntimeV2::WarnIfNoClassesCached ()
{
if (m_noclasses_warning_emitted)
return;
if (m_process &&
m_process->GetTarget().GetPlatform() &&
m_process->GetTarget().GetPlatform()->GetPluginName().GetStringRef().endswith("-simulator"))
{
// Simulators do not have the objc_opt_ro class table so don't actually complain to the user
m_noclasses_warning_emitted = true;
return;
}
Debugger &debugger(GetProcess()->GetTarget().GetDebugger());
if (debugger.GetAsyncOutputStream())
{
debugger.GetAsyncOutputStream()->PutCString("warning: could not load any Objective-C class information from the dyld shared cache. This will significantly reduce the quality of type information available.\n");
m_noclasses_warning_emitted = true;
}
}
// 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);
}
DeclVendor *
AppleObjCRuntimeV2::GetDeclVendor()
{
if (!m_decl_vendor_ap.get())
m_decl_vendor_ap.reset(new AppleObjCDeclVendor(*this));
return m_decl_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::TaggedPointerVendorV2*
AppleObjCRuntimeV2::TaggedPointerVendorV2::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);
// try to detect the "extended tagged pointer" variables - if any are missing, use the non-extended vendor
do
{
auto objc_debug_taggedpointer_ext_mask = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_ext_mask"),
objc_module_sp,
error);
if (error.Fail())
break;
auto objc_debug_taggedpointer_ext_slot_shift = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_ext_slot_shift"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
break;
auto objc_debug_taggedpointer_ext_slot_mask = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_ext_slot_mask"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
break;
auto objc_debug_taggedpointer_ext_classes = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_ext_classes"),
objc_module_sp,
error,
false);
if (error.Fail())
break;
auto objc_debug_taggedpointer_ext_payload_lshift = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_ext_payload_lshift"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
break;
auto objc_debug_taggedpointer_ext_payload_rshift = ExtractRuntimeGlobalSymbol(process,
ConstString("objc_debug_taggedpointer_ext_payload_rshift"),
objc_module_sp,
error,
true,
4);
if (error.Fail())
break;
return new TaggedPointerVendorExtended(runtime,
objc_debug_taggedpointer_mask,
objc_debug_taggedpointer_ext_mask,
objc_debug_taggedpointer_slot_shift,
objc_debug_taggedpointer_ext_slot_shift,
objc_debug_taggedpointer_slot_mask,
objc_debug_taggedpointer_ext_slot_mask,
objc_debug_taggedpointer_payload_lshift,
objc_debug_taggedpointer_payload_rshift,
objc_debug_taggedpointer_ext_payload_lshift,
objc_debug_taggedpointer_ext_payload_rshift,
objc_debug_taggedpointer_classes,
objc_debug_taggedpointer_ext_classes);
} while(false);
// 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) :
TaggedPointerVendorV2(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::TaggedPointerVendorExtended::TaggedPointerVendorExtended (AppleObjCRuntimeV2& runtime,
uint64_t objc_debug_taggedpointer_mask,
uint64_t objc_debug_taggedpointer_ext_mask,
uint32_t objc_debug_taggedpointer_slot_shift,
uint32_t objc_debug_taggedpointer_ext_slot_shift,
uint32_t objc_debug_taggedpointer_slot_mask,
uint32_t objc_debug_taggedpointer_ext_slot_mask,
uint32_t objc_debug_taggedpointer_payload_lshift,
uint32_t objc_debug_taggedpointer_payload_rshift,
uint32_t objc_debug_taggedpointer_ext_payload_lshift,
uint32_t objc_debug_taggedpointer_ext_payload_rshift,
lldb::addr_t objc_debug_taggedpointer_classes,
lldb::addr_t objc_debug_taggedpointer_ext_classes) :
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),
m_ext_cache(),
m_objc_debug_taggedpointer_ext_mask(objc_debug_taggedpointer_ext_mask),
m_objc_debug_taggedpointer_ext_slot_shift(objc_debug_taggedpointer_ext_slot_shift),
m_objc_debug_taggedpointer_ext_slot_mask(objc_debug_taggedpointer_ext_slot_mask),
m_objc_debug_taggedpointer_ext_payload_lshift(objc_debug_taggedpointer_ext_payload_lshift),
m_objc_debug_taggedpointer_ext_payload_rshift(objc_debug_taggedpointer_ext_payload_rshift),
m_objc_debug_taggedpointer_ext_classes(objc_debug_taggedpointer_ext_classes)
{
}
bool
AppleObjCRuntimeV2::TaggedPointerVendorExtended::IsPossibleExtendedTaggedPointer (lldb::addr_t ptr)
{
if (!IsPossibleTaggedPointer(ptr))
return false;
if (m_objc_debug_taggedpointer_ext_mask == 0)
return false;
return ((ptr & m_objc_debug_taggedpointer_ext_mask) == m_objc_debug_taggedpointer_ext_mask);
}
ObjCLanguageRuntime::ClassDescriptorSP
AppleObjCRuntimeV2::TaggedPointerVendorExtended::GetClassDescriptor (lldb::addr_t ptr)
{
ClassDescriptorSP actual_class_descriptor_sp;
uint64_t data_payload;
if (!IsPossibleTaggedPointer(ptr))
return ObjCLanguageRuntime::ClassDescriptorSP();
if (!IsPossibleExtendedTaggedPointer(ptr))
return this->TaggedPointerVendorRuntimeAssisted::GetClassDescriptor(ptr);
uintptr_t slot = (ptr >> m_objc_debug_taggedpointer_ext_slot_shift) & m_objc_debug_taggedpointer_ext_slot_mask;
CacheIterator iterator = m_ext_cache.find(slot),
end = m_ext_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_ext_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_ext_cache[slot] = actual_class_descriptor_sp;
}
data_payload = (((uint64_t)ptr << m_objc_debug_taggedpointer_ext_payload_lshift) >> m_objc_debug_taggedpointer_ext_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;
}
ObjCLanguageRuntime::EncodingToTypeSP
AppleObjCRuntimeV2::GetEncodingToType ()
{
if (!m_encoding_to_type_sp)
m_encoding_to_type_sp.reset(new AppleObjCTypeEncodingParser(*this));
return m_encoding_to_type_sp;
}
lldb_private::AppleObjCRuntime::ObjCISA
AppleObjCRuntimeV2::GetPointerISA (ObjCISA isa)
{
ObjCISA ret = isa;
if (m_non_pointer_isa_cache_ap)
m_non_pointer_isa_cache_ap->EvaluateNonPointerISA(isa, ret);
return ret;
}
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