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104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
#include <assert.h>
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/**
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* Metadata structure describing a method.
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*/
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// begin: objc_method
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struct objc_method
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{
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/**
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* A pointer to the function implementing this method.
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*/
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IMP imp;
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/**
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* Selector used to send messages to this method.
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*/
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SEL selector;
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/**
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* The extended type encoding for this method.
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*/
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const char *types;
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};
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// end: objc_method
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struct objc_method_gcc
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{
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/**
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* Selector used to send messages to this method. The type encoding of
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* this method should match the types field.
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*/
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SEL selector;
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/**
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* The type encoding for this selector. Used only for introspection, and
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* only required because of the stupid selector handling in the old GNU
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* runtime. In future, this field may be reused for something else.
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*/
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const char *types;
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/**
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* A pointer to the function implementing this method.
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*/
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IMP imp;
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};
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/**
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* Method list. Each class or category defines a new one of these and they are
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* all chained together in a linked list, with new ones inserted at the head.
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* When constructing the dispatch table, methods in the start of the list are
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* used in preference to ones at the end.
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*/
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// begin: objc_method_list
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struct objc_method_list
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{
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/**
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* The next group of methods in the list.
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*/
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struct objc_method_list *next;
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/**
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* The number of methods in this list.
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*/
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int count;
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/**
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* Sze of `struct objc_method`. This allows runtimes downgrading newer
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* versions of this structure.
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*/
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size_t size;
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/**
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* An array of methods. Note that the actual size of this is count.
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*/
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struct objc_method methods[];
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};
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// end: objc_method_list
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/**
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* Returns a pointer to the method inside the `objc_method` structure. This
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* structure is designed to allow the compiler to add other fields without
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* breaking the ABI, so although the `methods` field appears to be an array
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* of `objc_method` structures, it may be an array of some future version of
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* `objc_method` structs, which have fields appended that this version of the
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* runtime does not know about.
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*/
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static inline struct objc_method *method_at_index(struct objc_method_list *l, int i)
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{
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assert(l->size >= sizeof(struct objc_method));
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return (struct objc_method*)(((char*)l->methods) + (i * l->size));
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}
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/**
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* Legacy version of the method list.
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*/
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struct objc_method_list_gcc
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{
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/**
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* The next group of methods in the list.
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*/
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struct objc_method_list_gcc *next;
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/**
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* The number of methods in this list.
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*/
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int count;
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/**
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* An array of methods. Note that the actual size of this is count.
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*/
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struct objc_method_gcc methods[];
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};
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