1 //===-- AppleObjCClassDescriptorV2.cpp -----------------------------*- C++
4 // The LLVM Compiler Infrastructure
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #include "AppleObjCClassDescriptorV2.h"
13 #include "lldb/Expression/FunctionCaller.h"
14 #include "lldb/Utility/Log.h"
17 using namespace lldb_private;
19 bool ClassDescriptorV2::Read_objc_class(
20 Process *process, std::unique_ptr<objc_class_t> &objc_class) const {
21 objc_class.reset(new objc_class_t);
23 bool ret = objc_class->Read(process, m_objc_class_ptr);
31 static lldb::addr_t GetClassDataMask(Process *process) {
32 switch (process->GetAddressByteSize()) {
36 return 0x00007ffffffffff8UL;
41 return LLDB_INVALID_ADDRESS;
44 bool ClassDescriptorV2::objc_class_t::Read(Process *process,
46 size_t ptr_size = process->GetAddressByteSize();
48 size_t objc_class_size = ptr_size // uintptr_t isa;
49 + ptr_size // Class superclass;
50 + ptr_size // void *cache;
51 + ptr_size // IMP *vtable;
52 + ptr_size; // uintptr_t data_NEVER_USE;
54 DataBufferHeap objc_class_buf(objc_class_size, '\0');
57 process->ReadMemory(addr, objc_class_buf.GetBytes(), objc_class_size, error);
62 DataExtractor extractor(objc_class_buf.GetBytes(), objc_class_size,
63 process->GetByteOrder(),
64 process->GetAddressByteSize());
66 lldb::offset_t cursor = 0;
68 m_isa = extractor.GetAddress_unchecked(&cursor); // uintptr_t isa;
69 m_superclass = extractor.GetAddress_unchecked(&cursor); // Class superclass;
70 m_cache_ptr = extractor.GetAddress_unchecked(&cursor); // void *cache;
71 m_vtable_ptr = extractor.GetAddress_unchecked(&cursor); // IMP *vtable;
72 lldb::addr_t data_NEVER_USE =
73 extractor.GetAddress_unchecked(&cursor); // uintptr_t data_NEVER_USE;
75 m_flags = (uint8_t)(data_NEVER_USE & (lldb::addr_t)3);
76 m_data_ptr = data_NEVER_USE & GetClassDataMask(process);
81 bool ClassDescriptorV2::class_rw_t::Read(Process *process, lldb::addr_t addr) {
82 size_t ptr_size = process->GetAddressByteSize();
84 size_t size = sizeof(uint32_t) // uint32_t flags;
85 + sizeof(uint32_t) // uint32_t version;
86 + ptr_size // const class_ro_t *ro;
87 + ptr_size // union { method_list_t **method_lists;
88 // method_list_t *method_list; };
89 + ptr_size // struct chained_property_list *properties;
90 + ptr_size // const protocol_list_t **protocols;
91 + ptr_size // Class firstSubclass;
92 + ptr_size; // Class nextSiblingClass;
94 DataBufferHeap buffer(size, '\0');
97 process->ReadMemory(addr, buffer.GetBytes(), size, error);
102 DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(),
103 process->GetAddressByteSize());
105 lldb::offset_t cursor = 0;
107 m_flags = extractor.GetU32_unchecked(&cursor);
108 m_version = extractor.GetU32_unchecked(&cursor);
109 m_ro_ptr = extractor.GetAddress_unchecked(&cursor);
110 m_method_list_ptr = extractor.GetAddress_unchecked(&cursor);
111 m_properties_ptr = extractor.GetAddress_unchecked(&cursor);
112 m_firstSubclass = extractor.GetAddress_unchecked(&cursor);
113 m_nextSiblingClass = extractor.GetAddress_unchecked(&cursor);
118 bool ClassDescriptorV2::class_ro_t::Read(Process *process, lldb::addr_t addr) {
119 size_t ptr_size = process->GetAddressByteSize();
121 size_t size = sizeof(uint32_t) // uint32_t flags;
122 + sizeof(uint32_t) // uint32_t instanceStart;
123 + sizeof(uint32_t) // uint32_t instanceSize;
124 + (ptr_size == 8 ? sizeof(uint32_t)
125 : 0) // uint32_t reserved; // __LP64__ only
126 + ptr_size // const uint8_t *ivarLayout;
127 + ptr_size // const char *name;
128 + ptr_size // const method_list_t *baseMethods;
129 + ptr_size // const protocol_list_t *baseProtocols;
130 + ptr_size // const ivar_list_t *ivars;
131 + ptr_size // const uint8_t *weakIvarLayout;
132 + ptr_size; // const property_list_t *baseProperties;
134 DataBufferHeap buffer(size, '\0');
137 process->ReadMemory(addr, buffer.GetBytes(), size, error);
142 DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(),
143 process->GetAddressByteSize());
145 lldb::offset_t cursor = 0;
147 m_flags = extractor.GetU32_unchecked(&cursor);
148 m_instanceStart = extractor.GetU32_unchecked(&cursor);
149 m_instanceSize = extractor.GetU32_unchecked(&cursor);
151 m_reserved = extractor.GetU32_unchecked(&cursor);
154 m_ivarLayout_ptr = extractor.GetAddress_unchecked(&cursor);
155 m_name_ptr = extractor.GetAddress_unchecked(&cursor);
156 m_baseMethods_ptr = extractor.GetAddress_unchecked(&cursor);
157 m_baseProtocols_ptr = extractor.GetAddress_unchecked(&cursor);
158 m_ivars_ptr = extractor.GetAddress_unchecked(&cursor);
159 m_weakIvarLayout_ptr = extractor.GetAddress_unchecked(&cursor);
160 m_baseProperties_ptr = extractor.GetAddress_unchecked(&cursor);
162 DataBufferHeap name_buf(1024, '\0');
164 process->ReadCStringFromMemory(m_name_ptr, (char *)name_buf.GetBytes(),
165 name_buf.GetByteSize(), error);
171 m_name.assign((char *)name_buf.GetBytes());
176 bool ClassDescriptorV2::Read_class_row(
177 Process *process, const objc_class_t &objc_class,
178 std::unique_ptr<class_ro_t> &class_ro,
179 std::unique_ptr<class_rw_t> &class_rw) const {
184 uint32_t class_row_t_flags = process->ReadUnsignedIntegerFromMemory(
185 objc_class.m_data_ptr, sizeof(uint32_t), 0, error);
186 if (!error.Success())
189 if (class_row_t_flags & RW_REALIZED) {
190 class_rw.reset(new class_rw_t);
192 if (!class_rw->Read(process, objc_class.m_data_ptr)) {
197 class_ro.reset(new class_ro_t);
199 if (!class_ro->Read(process, class_rw->m_ro_ptr)) {
205 class_ro.reset(new class_ro_t);
207 if (!class_ro->Read(process, objc_class.m_data_ptr)) {
216 bool ClassDescriptorV2::method_list_t::Read(Process *process,
218 size_t size = sizeof(uint32_t) // uint32_t entsize_NEVER_USE;
219 + sizeof(uint32_t); // uint32_t count;
221 DataBufferHeap buffer(size, '\0');
224 process->ReadMemory(addr, buffer.GetBytes(), size, error);
229 DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(),
230 process->GetAddressByteSize());
232 lldb::offset_t cursor = 0;
234 m_entsize = extractor.GetU32_unchecked(&cursor) & ~(uint32_t)3;
235 m_count = extractor.GetU32_unchecked(&cursor);
236 m_first_ptr = addr + cursor;
241 bool ClassDescriptorV2::method_t::Read(Process *process, lldb::addr_t addr) {
242 size_t size = GetSize(process);
244 DataBufferHeap buffer(size, '\0');
247 process->ReadMemory(addr, buffer.GetBytes(), size, error);
252 DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(),
253 process->GetAddressByteSize());
255 lldb::offset_t cursor = 0;
257 m_name_ptr = extractor.GetAddress_unchecked(&cursor);
258 m_types_ptr = extractor.GetAddress_unchecked(&cursor);
259 m_imp_ptr = extractor.GetAddress_unchecked(&cursor);
261 process->ReadCStringFromMemory(m_name_ptr, m_name, error);
266 process->ReadCStringFromMemory(m_types_ptr, m_types, error);
267 return !error.Fail();
270 bool ClassDescriptorV2::ivar_list_t::Read(Process *process, lldb::addr_t addr) {
271 size_t size = sizeof(uint32_t) // uint32_t entsize;
272 + sizeof(uint32_t); // uint32_t count;
274 DataBufferHeap buffer(size, '\0');
277 process->ReadMemory(addr, buffer.GetBytes(), size, error);
282 DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(),
283 process->GetAddressByteSize());
285 lldb::offset_t cursor = 0;
287 m_entsize = extractor.GetU32_unchecked(&cursor);
288 m_count = extractor.GetU32_unchecked(&cursor);
289 m_first_ptr = addr + cursor;
294 bool ClassDescriptorV2::ivar_t::Read(Process *process, lldb::addr_t addr) {
295 size_t size = GetSize(process);
297 DataBufferHeap buffer(size, '\0');
300 process->ReadMemory(addr, buffer.GetBytes(), size, error);
305 DataExtractor extractor(buffer.GetBytes(), size, process->GetByteOrder(),
306 process->GetAddressByteSize());
308 lldb::offset_t cursor = 0;
310 m_offset_ptr = extractor.GetAddress_unchecked(&cursor);
311 m_name_ptr = extractor.GetAddress_unchecked(&cursor);
312 m_type_ptr = extractor.GetAddress_unchecked(&cursor);
313 m_alignment = extractor.GetU32_unchecked(&cursor);
314 m_size = extractor.GetU32_unchecked(&cursor);
316 process->ReadCStringFromMemory(m_name_ptr, m_name, error);
321 process->ReadCStringFromMemory(m_type_ptr, m_type, error);
322 return !error.Fail();
325 bool ClassDescriptorV2::Describe(
326 std::function<void(ObjCLanguageRuntime::ObjCISA)> const &superclass_func,
327 std::function<bool(const char *, const char *)> const &instance_method_func,
328 std::function<bool(const char *, const char *)> const &class_method_func,
329 std::function<bool(const char *, const char *, lldb::addr_t,
330 uint64_t)> const &ivar_func) const {
331 lldb_private::Process *process = m_runtime.GetProcess();
333 std::unique_ptr<objc_class_t> objc_class;
334 std::unique_ptr<class_ro_t> class_ro;
335 std::unique_ptr<class_rw_t> class_rw;
337 if (!Read_objc_class(process, objc_class))
339 if (!Read_class_row(process, *objc_class, class_ro, class_rw))
342 static ConstString NSObject_name("NSObject");
344 if (m_name != NSObject_name && superclass_func)
345 superclass_func(objc_class->m_superclass);
347 if (instance_method_func) {
348 std::unique_ptr<method_list_t> base_method_list;
350 base_method_list.reset(new method_list_t);
351 if (!base_method_list->Read(process, class_ro->m_baseMethods_ptr))
354 if (base_method_list->m_entsize != method_t::GetSize(process))
357 std::unique_ptr<method_t> method;
358 method.reset(new method_t);
360 for (uint32_t i = 0, e = base_method_list->m_count; i < e; ++i) {
361 method->Read(process, base_method_list->m_first_ptr +
362 (i * base_method_list->m_entsize));
364 if (instance_method_func(method->m_name.c_str(), method->m_types.c_str()))
369 if (class_method_func) {
370 AppleObjCRuntime::ClassDescriptorSP metaclass(GetMetaclass());
372 // We don't care about the metaclass's superclass, or its class methods.
373 // Its instance methods are our class methods.
377 std::function<void(ObjCLanguageRuntime::ObjCISA)>(nullptr),
379 std::function<bool(const char *, const char *)>(nullptr),
380 std::function<bool(const char *, const char *, lldb::addr_t,
381 uint64_t)>(nullptr));
386 if (class_ro->m_ivars_ptr != 0) {
387 ivar_list_t ivar_list;
388 if (!ivar_list.Read(process, class_ro->m_ivars_ptr))
391 if (ivar_list.m_entsize != ivar_t::GetSize(process))
396 for (uint32_t i = 0, e = ivar_list.m_count; i < e; ++i) {
397 ivar.Read(process, ivar_list.m_first_ptr + (i * ivar_list.m_entsize));
399 if (ivar_func(ivar.m_name.c_str(), ivar.m_type.c_str(),
400 ivar.m_offset_ptr, ivar.m_size))
409 ConstString ClassDescriptorV2::GetClassName() {
411 lldb_private::Process *process = m_runtime.GetProcess();
414 std::unique_ptr<objc_class_t> objc_class;
415 std::unique_ptr<class_ro_t> class_ro;
416 std::unique_ptr<class_rw_t> class_rw;
418 if (!Read_objc_class(process, objc_class))
420 if (!Read_class_row(process, *objc_class, class_ro, class_rw))
423 m_name = ConstString(class_ro->m_name.c_str());
429 ObjCLanguageRuntime::ClassDescriptorSP ClassDescriptorV2::GetSuperclass() {
430 lldb_private::Process *process = m_runtime.GetProcess();
433 return ObjCLanguageRuntime::ClassDescriptorSP();
435 std::unique_ptr<objc_class_t> objc_class;
437 if (!Read_objc_class(process, objc_class))
438 return ObjCLanguageRuntime::ClassDescriptorSP();
440 return m_runtime.ObjCLanguageRuntime::GetClassDescriptorFromISA(
441 objc_class->m_superclass);
444 ObjCLanguageRuntime::ClassDescriptorSP ClassDescriptorV2::GetMetaclass() const {
445 lldb_private::Process *process = m_runtime.GetProcess();
448 return ObjCLanguageRuntime::ClassDescriptorSP();
450 std::unique_ptr<objc_class_t> objc_class;
452 if (!Read_objc_class(process, objc_class))
453 return ObjCLanguageRuntime::ClassDescriptorSP();
455 lldb::addr_t candidate_isa = m_runtime.GetPointerISA(objc_class->m_isa);
457 return ObjCLanguageRuntime::ClassDescriptorSP(
458 new ClassDescriptorV2(m_runtime, candidate_isa, nullptr));
461 uint64_t ClassDescriptorV2::GetInstanceSize() {
462 lldb_private::Process *process = m_runtime.GetProcess();
465 std::unique_ptr<objc_class_t> objc_class;
466 std::unique_ptr<class_ro_t> class_ro;
467 std::unique_ptr<class_rw_t> class_rw;
469 if (!Read_objc_class(process, objc_class))
471 if (!Read_class_row(process, *objc_class, class_ro, class_rw))
474 return class_ro->m_instanceSize;
480 ClassDescriptorV2::iVarsStorage::iVarsStorage()
481 : m_filled(false), m_ivars(), m_mutex() {}
483 size_t ClassDescriptorV2::iVarsStorage::size() { return m_ivars.size(); }
485 ClassDescriptorV2::iVarDescriptor &ClassDescriptorV2::iVarsStorage::
486 operator[](size_t idx) {
490 void ClassDescriptorV2::iVarsStorage::fill(AppleObjCRuntimeV2 &runtime,
491 ClassDescriptorV2 &descriptor) {
494 std::lock_guard<std::recursive_mutex> guard(m_mutex);
495 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_TYPES));
496 LLDB_LOGV(log, "class_name = {0}", descriptor.GetClassName());
498 ObjCLanguageRuntime::EncodingToTypeSP encoding_to_type_sp(
499 runtime.GetEncodingToType());
500 Process *process(runtime.GetProcess());
501 if (!encoding_to_type_sp)
503 descriptor.Describe(nullptr, nullptr, nullptr, [this, process,
505 log](const char *name,
507 lldb::addr_t offset_ptr,
508 uint64_t size) -> bool {
509 const bool for_expression = false;
510 const bool stop_loop = false;
511 LLDB_LOGV(log, "name = {0}, encoding = {1}, offset_ptr = {2:x}, size = {3}",
512 name, type, offset_ptr, size);
513 CompilerType ivar_type =
514 encoding_to_type_sp->RealizeType(type, for_expression);
517 "name = {0}, encoding = {1}, offset_ptr = {2:x}, size = "
518 "{3}, type_size = {4}",
519 name, type, offset_ptr, size,
520 ivar_type.GetByteSize(nullptr).getValueOr(0));
521 Scalar offset_scalar;
523 const int offset_ptr_size = 4;
524 const bool is_signed = false;
525 size_t read = process->ReadScalarIntegerFromMemory(
526 offset_ptr, offset_ptr_size, is_signed, offset_scalar, error);
527 if (error.Success() && 4 == read) {
528 LLDB_LOGV(log, "offset_ptr = {0:x} --> {1}", offset_ptr,
529 offset_scalar.SInt());
531 {ConstString(name), ivar_type, size, offset_scalar.SInt()});
533 LLDB_LOGV(log, "offset_ptr = {0:x} --> read fail, read = %{1}",
540 void ClassDescriptorV2::GetIVarInformation() {
541 m_ivars_storage.fill(m_runtime, *this);