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//
// Created by kat on 5/23/23.
//
#ifndef SHAREDCACHE_OBJC_H
#define SHAREDCACHE_OBJC_H
#include <binaryninjaapi.h>
#include "VM.h"
#include "SharedCache.h"
using namespace BinaryNinja;
namespace DSCObjC {
// This set of structs is based on the objc4 source,
// however pointers have been replaced with view_ptr_t
// Used for pointers within BinaryView, primarily to make it far more clear in typedefs
// whether the size of a field can vary between architectures.
// These should _not_ be used in sizeof or direct Read() calls.
typedef uint64_t view_ptr_t;
typedef struct {
view_ptr_t name;
view_ptr_t types;
view_ptr_t imp;
} method_t;
typedef struct {
uint32_t name;
uint32_t types;
uint32_t imp;
} method_entry_t;
typedef struct {
view_ptr_t offset;
view_ptr_t name;
view_ptr_t type;
uint32_t alignmentRaw;
uint32_t size;
} ivar_t;
typedef struct {
view_ptr_t name;
view_ptr_t attributes;
} property_t;
typedef struct {
uint32_t entsizeAndFlags;
uint32_t count;
} method_list_t;
typedef struct {
uint32_t entsizeAndFlags;
uint32_t count;
} ivar_list_t;
typedef struct {
uint32_t entsizeAndFlags;
uint32_t count;
} property_list_t;
typedef struct {
uint64_t count;
} protocol_list_t;
struct relative_list_list_entry_t {
uint64_t imageIndex: 16;
int64_t listOffset: 48;
};
typedef struct {
view_ptr_t isa;
view_ptr_t mangledName;
view_ptr_t protocols;
view_ptr_t instanceMethods;
view_ptr_t classMethods;
view_ptr_t optionalInstanceMethods;
view_ptr_t optionalClassMethods;
view_ptr_t instanceProperties;
uint32_t size;
uint32_t flags;
} protocol_t;
typedef struct {
uint32_t flags;
uint32_t instanceStart;
uint32_t instanceSize;
uint32_t reserved;
view_ptr_t ivarLayout;
view_ptr_t name;
view_ptr_t baseMethods;
view_ptr_t baseProtocols;
view_ptr_t ivars;
view_ptr_t weakIvarLayout;
view_ptr_t baseProperties;
} class_ro_t;
typedef struct {
view_ptr_t isa;
view_ptr_t super;
view_ptr_t cache;
view_ptr_t vtable;
view_ptr_t data;
} class_t;
typedef struct {
view_ptr_t name;
view_ptr_t cls;
view_ptr_t instanceMethods;
view_ptr_t classMethods;
view_ptr_t protocols;
view_ptr_t instanceProperties;
} category_t;
typedef struct {
view_ptr_t receiver;
view_ptr_t current_class;
} objc_super2;
typedef struct {
view_ptr_t imp;
view_ptr_t sel;
} message_ref_t;
struct Method {
std::string name;
std::string types;
view_ptr_t imp;
};
struct Ivar {
uint32_t offset;
std::string name;
std::string type;
uint32_t alignment;
uint32_t size;
};
struct Property {
std::string name;
std::string attributes;
};
struct ClassBase {
std::map<uint64_t, Method> methodList;
std::map<uint64_t, Ivar> ivarList;
};
struct Class {
std::string name;
ClassBase instanceClass;
ClassBase metaClass;
// Loaded by type processing
QualifiedName associatedName;
};
class Protocol {
public:
std::string name;
std::vector<QualifiedName> protocols;
ClassBase instanceMethods;
ClassBase classMethods;
ClassBase optionalInstanceMethods;
ClassBase optionalClassMethods;
};
struct QualifiedNameOrType {
BinaryNinja::Ref<BinaryNinja::Type> type = nullptr;
BinaryNinja::QualifiedName name;
size_t ptrCount = 0;
};
class DSCObjCProcessor {
struct Types {
// QualifiedName relativePtr;
// QualifiedName id;
// QualifiedName sel;
// QualifiedName BOOL;
// QualifiedName nsInteger;
// QualifiedName nsuInteger;
// QualifiedName cgFloat;
QualifiedName cfStringFlag;
QualifiedName cfString;
QualifiedName cfStringUTF16;
QualifiedName imageInfoFlags;
QualifiedName imageInfoSwiftVersion;
QualifiedName imageInfo;
QualifiedName methodEntry;
QualifiedName method;
QualifiedName methodList;
QualifiedName classRO;
QualifiedName cls;
QualifiedName category;
QualifiedName protocol;
QualifiedName protocolList;
QualifiedName ivar;
QualifiedName ivarList;
} m_typeNames;
bool m_isBackedByDatabase;
BinaryView* m_data;
SymbolQueue* m_symbolQueue = nullptr;
Ref<Logger> m_logger;
std::map<uint64_t, Class> m_classes;
std::map<uint64_t, Class> m_categories;
std::map<uint64_t, Protocol> m_protocols;
std::unordered_map<uint64_t, std::string> m_selectorCache;
std::unordered_map<uint64_t, Method> m_localMethods;
// Required for workflow_objc type heuristics, should be removed when that is no longer a thing.
std::map<uint64_t, std::string> m_selRefToName;
std::map<uint64_t, std::vector<uint64_t>> m_selRefToImplementations;
std::map<uint64_t, std::vector<uint64_t>> m_selToImplementations;
// --
std::optional<uint64_t> m_customRelativeMethodSelectorBase = std::nullopt;
SharedCacheCore::SharedCache* m_cache;
uint64_t ReadPointerAccountingForRelocations(VMReader* reader);
std::unordered_map<uint64_t, uint64_t> m_relocationPointerRewrites;
static Ref<Metadata> SerializeMethod(uint64_t loc, const Method& method);
static Ref<Metadata> SerializeClass(uint64_t loc, const Class& cls);
Ref<Metadata> SerializeMetadata();
std::vector<QualifiedNameOrType> ParseEncodedType(const std::string& type);
void DefineObjCSymbol(BNSymbolType symbolType, QualifiedName typeName, const std::string& name, uint64_t addr, bool deferred);
void DefineObjCSymbol(BNSymbolType symbolType, Ref<Type> type, const std::string& name, uint64_t addr, bool deferred);
void ReadIvarList(VMReader* reader, ClassBase& cls, std::string_view name, view_ptr_t start);
void ReadMethodList(VMReader* reader, ClassBase& cls, std::string_view name, view_ptr_t start);
void ReadListOfMethodLists(VMReader* reader, ClassBase& cls, std::string_view name, view_ptr_t start);
void LoadClasses(VMReader* reader, Ref<Section> listSection);
void LoadCategories(VMReader* reader, Ref<Section> listSection);
void LoadProtocols(VMReader* reader, Ref<Section> listSection);
void GenerateClassTypes();
bool ApplyMethodType(Class& cls, Method& method, bool isInstanceMethod);
void ApplyMethodTypes(Class& cls);
void PostProcessObjCSections(VMReader* reader, std::string baseName);
public:
DSCObjCProcessor(BinaryView* data, SharedCacheCore::SharedCache* cache, bool isBackedByDatabase);
void ProcessObjCData(std::shared_ptr<VM> vm, std::string baseName);
void ProcessCFStrings(std::shared_ptr<VM> vm, std::string baseName);
void AddRelocatedPointer(uint64_t location, uint64_t rewrite);
};
}
#endif //SHAREDCACHE_OBJC_H
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