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Add support for resolving dynamic types of extended ObjC tagged pointers 

rdar://problem/24401051

llvm-svn: 266001
This commit is contained in:
Enrico Granata 2016-04-11 21:50:35 +00:00
parent 2aa7f23272
commit ea0ef6b19d
2 changed files with 188 additions and 0 deletions
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149
lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
View File

@ -2034,6 +2034,74 @@ AppleObjCRuntimeV2::TaggedPointerVendorV2::CreateInstance (AppleObjCRuntimeV2& r
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)
@ -2173,6 +2241,87 @@ AppleObjCRuntimeV2::TaggedPointerVendorRuntimeAssisted::GetClassDescriptor (lldb
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,

39
lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
View File

@ -234,6 +234,45 @@ private:
DISALLOW_COPY_AND_ASSIGN(TaggedPointerVendorRuntimeAssisted);
};
class TaggedPointerVendorExtended : public TaggedPointerVendorRuntimeAssisted
{
public:
ObjCLanguageRuntime::ClassDescriptorSP
GetClassDescriptor(lldb::addr_t ptr) override;
protected:
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);
bool
IsPossibleExtendedTaggedPointer (lldb::addr_t ptr);
typedef std::map<uint8_t,ObjCLanguageRuntime::ClassDescriptorSP> Cache;
typedef Cache::iterator CacheIterator;
Cache m_ext_cache;
uint64_t m_objc_debug_taggedpointer_ext_mask;
uint32_t m_objc_debug_taggedpointer_ext_slot_shift;
uint32_t m_objc_debug_taggedpointer_ext_slot_mask;
uint32_t m_objc_debug_taggedpointer_ext_payload_lshift;
uint32_t m_objc_debug_taggedpointer_ext_payload_rshift;
lldb::addr_t m_objc_debug_taggedpointer_ext_classes;
friend class AppleObjCRuntimeV2::TaggedPointerVendorV2;
DISALLOW_COPY_AND_ASSIGN(TaggedPointerVendorExtended);
};
class TaggedPointerVendorLegacy : public TaggedPointerVendorV2
{
public: