/* Definitions of Module Structures used by ABI version 8 Copyright (C) 1993-2017 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see . */ #ifndef __objc_private_module_abi_8_INCLUDE_GNU #define __objc_private_module_abi_8_INCLUDE_GNU /* For every class which happens to have statically allocated instances in this module, one OBJC_STATIC_INSTANCES is allocated by the compiler. INSTANCES is NULL terminated and points to all statically allocated instances of this class. */ struct objc_static_instances { char *class_name; #ifdef __cplusplus id instances[1]; #else id instances[0]; #endif }; /* Whereas a Module (defined further down) is the root (typically) of a file, a Symtab is the root of the class and category definitions within the module. A Symtab contains a variable length array of pointers to classes and categories defined in the module. */ struct objc_symtab { unsigned long sel_ref_cnt; /* Unused (always set to 0). */ struct objc_selector *refs; /* The table of selectors referenced in this module. This is terminated by a selector with NULL sel_id and NULL sel_types. Note that we use the type 'struct objc_selector *' and not 'SEL' (which is 'const struct objc_selector *') because the sel_id of these selectors is patched up by the runtime when the module is loaded. */ unsigned short cls_def_cnt; /* Number of classes compiled (defined) in the module. */ unsigned short cat_def_cnt; /* Number of categories compiled (defined) in the module. */ void *defs[1]; /* Variable array of pointers. cls_def_cnt of type Class followed by cat_def_cnt of type Category_t, followed by a NULL terminated array of objc_static_instances. */ }; /* The compiler generates one of these structures for each module that composes the executable (eg main.m). This data structure is the root of the definition tree for the module. A collect program runs between ld stages and creates a ObjC ctor array. That array holds a pointer to each module structure of the executable. */ struct objc_module { unsigned long version; /* Version of the Module data structure. */ unsigned long size; /* sizeof(Module) according to the compiler - only used to sanity check that it matches sizeof(Module) according to the runtime. */ const char* name; /* Name of the file used to compile the module - not set by modern compilers for security reasons. */ struct objc_symtab *symtab; /* Pointer to the Symtab of the module. The Symtab holds an array of pointers to the classes and categories defined in the module. */ }; /* The compiler generates one of these structures for a class that has instance variables defined in its specification. */ struct objc_ivar { const char* ivar_name; /* Name of the instance variable as entered in the class definition. */ const char* ivar_type; /* Description of the Ivar's type. Useful for debuggers. */ int ivar_offset; /* Byte offset from the base address of the instance structure to the variable. */ }; struct objc_ivar_list { int ivar_count; /* Number of structures (Ivar) contained in the list. One structure per instance variable defined in the class. */ struct objc_ivar ivar_list[1]; /* Variable length structure. */ }; /* The compiler generates one (or more) of these structures for a class that has methods defined in its specification. The implementation of a class can be broken into separate pieces in a file and categories can break them across modules. To handle this problem is a singly linked list of methods. */ struct objc_method { SEL method_name; /* This variable is the method's name. The compiler puts a char* here, and it's replaced by a real SEL at runtime when the method is registered. */ const char* method_types; /* Description of the method's parameter list. Used when registering the selector with the runtime. When that happens, method_name will contain the method's parameter list. */ IMP method_imp; /* Address of the method in the executable. */ }; struct objc_method_list { struct objc_method_list* method_next; /* This variable is used to link a method list to another. It is a singly linked list. */ int method_count; /* Number of methods defined in this structure. */ struct objc_method method_list[1]; /* Variable length structure. */ }; /* Note that a 'struct objc_method_description' as embedded inside a Protocol uses the same trick as a 'struct objc_method': the method_name is a 'char *' according to the compiler, who puts the method name as a string in there. At runtime, the selectors need to be registered, and the method_name then becomes a SEL. */ struct objc_method_description_list { int count; struct objc_method_description list[1]; }; struct objc_protocol { struct objc_class* class_pointer; char *protocol_name; struct objc_protocol_list *protocol_list; struct objc_method_description_list *instance_methods, *class_methods; }; struct objc_protocol_list { struct objc_protocol_list *next; size_t count; struct objc_protocol *list[1]; }; /* The compiler generates one of these structures for each class. This structure is the definition for classes. This structure is generated by the compiler in the executable and used by the run-time during normal messaging operations. Therefore some members change type. The compiler generates "char* const" and places a string in the following member variables: super_class. */ struct objc_class { struct objc_class* class_pointer; /* Pointer to the class's meta class. */ struct objc_class* super_class; /* Pointer to the super class. NULL for class Object. */ const char* name; /* Name of the class. */ long version; /* Unknown. */ unsigned long info; /* Bit mask. See class masks defined below. */ long instance_size; /* Size in bytes of the class. The sum of the class definition and all super class definitions. */ #ifdef _WIN64 /* We pad the structure manually to prevent warning when -Wpadded is used. The compiler automatically pads the structures that it generates, so this manually padded structure still matches the one generated by the compiler, but if we don't pad manually, -Wpadded detects that padding is being added and generates annoying warnings. This hack is necessary as on LLP64 targets sizeof (long) isn't equal to sizeof (void *). */ long pad; #endif struct objc_ivar_list* ivars; /* Pointer to a structure that describes the instance variables in the class definition. NULL indicates no instance variables. Does not include super class variables. */ struct objc_method_list* methods; /* Linked list of instance methods defined for the class. */ struct sarray * dtable; /* Pointer to instance method dispatch table. */ struct objc_class* subclass_list; /* Subclasses */ struct objc_class* sibling_class; struct objc_protocol_list *protocols; /* Protocols conformed to */ void* gc_object_type; }; /* This is used to assure consistent access to the info field of classes. */ #ifndef HOST_BITS_PER_LONG # define HOST_BITS_PER_LONG (sizeof(long)*8) #endif #define __CLS_INFO(cls) ((cls)->info) #define __CLS_ISINFO(cls, mask) ((__CLS_INFO(cls)&mask)==mask) #define __CLS_SETINFO(cls, mask) (__CLS_INFO(cls) |= mask) #define __CLS_SETNOTINFO(cls, mask) (__CLS_INFO(cls) &= ~mask) /* The structure is of type MetaClass */ #define _CLS_META 0x2L #define CLS_ISMETA(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_META)) /* The structure is of type Class */ #define _CLS_CLASS 0x1L #define CLS_ISCLASS(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_CLASS)) /* The class is initialized within the runtime. This means that it has had correct super and sublinks assigned. */ #define _CLS_RESOLV 0x8L #define CLS_ISRESOLV(cls) __CLS_ISINFO(cls, _CLS_RESOLV) #define CLS_SETRESOLV(cls) __CLS_SETINFO(cls, _CLS_RESOLV) /* The class has been send a +initialize message or a such is not defined for this class. */ #define _CLS_INITIALIZED 0x04L #define CLS_ISINITIALIZED(cls) __CLS_ISINFO(cls, _CLS_INITIALIZED) #define CLS_SETINITIALIZED(cls) __CLS_SETINFO(cls, _CLS_INITIALIZED) /* The class is being constructed; it has been allocated using objc_allocateClassPair(), but has not been registered yet by using objc_registerClassPair(). This means it is possible to freely add instance variables to the class, but it can't be used for anything yet. */ #define _CLS_IN_CONSTRUCTION 0x10L #define CLS_IS_IN_CONSTRUCTION(cls) __CLS_ISINFO(cls, _CLS_IN_CONSTRUCTION) #define CLS_SET_IN_CONSTRUCTION(cls) __CLS_SETINFO(cls, _CLS_IN_CONSTRUCTION) #define CLS_SET_NOT_IN_CONSTRUCTION(cls) __CLS_SETNOTINFO(cls, _CLS_IN_CONSTRUCTION) /* The class number of this class. This must be the same for both the class and its meta class object. */ #define CLS_GETNUMBER(cls) (__CLS_INFO(cls) >> (HOST_BITS_PER_LONG/2)) #define CLS_SETNUMBER(cls, num) \ ({ (cls)->info <<= (HOST_BITS_PER_LONG/2); \ (cls)->info >>= (HOST_BITS_PER_LONG/2); \ __CLS_SETINFO(cls, (((unsigned long)num) << (HOST_BITS_PER_LONG/2))); }) /* The compiler generates one of these structures for each category. A class may have many categories and contain both instance and factory methods. */ struct objc_category { const char* category_name; /* Name of the category. Name contained in the () of the category definition. */ const char* class_name; /* Name of the class to which the category belongs. */ struct objc_method_list *instance_methods; /* Linked list of instance methods defined in the category. NULL indicates no instance methods defined. */ struct objc_method_list *class_methods; /* Linked list of factory methods defined in the category. NULL indicates no class methods defined. */ struct objc_protocol_list *protocols; /* List of Protocols conformed to. */ }; #endif /* __objc_private_module_abi_8_INCLUDE_GNU */