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Add objc/blocks_private.h header to expose some internals of the bloc…
…ks runtime that are accessed by libdispatch. Also rename the relevant structs to be compatible with the BlocksRuntime from compiler-rt.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| #ifndef __LIBOBJC_BLOCKS_PRIVATE_H_INCLUDED__ | ||
| #define __LIBOBJC_BLOCKS_PRIVATE_H_INCLUDED__ | ||
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| /* | ||
| * This header file exposes some implementation details of the blocks runtime | ||
| * that are needed, e.g., by libdispatch. | ||
| */ | ||
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| /** | ||
| * Block descriptor that contains copy and dispose operations. | ||
| */ | ||
| struct Block_descriptor | ||
| { | ||
| /** | ||
| * Reserved for future use. Currently always 0. | ||
| */ | ||
| unsigned long int reserved; | ||
| /** Size of the block. */ | ||
| unsigned long int size; | ||
| /** | ||
| * Copy function, generated by the compiler to help copy the block if it | ||
| * contains nontrivial copy operations. | ||
| */ | ||
| void (*copy_helper)(void *dst, void *src); | ||
| /** | ||
| * Dispose function, generated by the compiler to help copy the block if it | ||
| * contains nontrivial destructors. | ||
| */ | ||
| void (*dispose_helper)(void *src); | ||
| /** | ||
| * Objective-C type encoding of the block. | ||
| */ | ||
| const char *encoding; | ||
| }; | ||
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| // Helper structure | ||
| struct Block_layout | ||
| { | ||
| /** | ||
| * Class pointer. Always initialised to &_NSConcreteStackBlock for blocks | ||
| * that are created on the stack or &_NSConcreteGlobalBlock for blocks that | ||
| * are created in global storage. | ||
| */ | ||
| void *isa; | ||
| /** | ||
| * Flags. See the block_flags enumerated type for possible values. | ||
| */ | ||
| int flags; | ||
| /** | ||
| * Reserved - always initialised to 0 by the compiler. Used for the | ||
| * reference count in this implementation. | ||
| */ | ||
| int reserved; | ||
| /** | ||
| * The function that implements the block. The first argument is this | ||
| * structure, the subsequent arguments are the block's explicit parameters. | ||
| * If the BLOCK_USE_SRET flag is set, there is an additional hidden | ||
| * argument, which is a pointer to the space on the stack allocated to hold | ||
| * the return value. | ||
| */ | ||
| void (*invoke)(void *, ...); | ||
| /** | ||
| * The block's descriptor. This is either Block_descriptor_basic or | ||
| * Block_descriptor, depending on whether the | ||
| * BLOCK_HAS_COPY_DISPOSE flag is set. | ||
| */ | ||
| struct Block_descriptor *descriptor; | ||
| /** | ||
| * Block variables are appended to this structure. | ||
| */ | ||
| }; | ||
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| #ifndef __OBJC_RUNTIME_INTERNAL__ | ||
| /* | ||
| * Deprecated Block_basic datastructure needed by libdispatch | ||
| */ | ||
| struct Block_basic { | ||
| void *isa; | ||
| int Block_flags; | ||
| int Block_size; | ||
| void (*Block_invoke)(void *); | ||
| void (*Block_copy)(void *dst, void *src); | ||
| void (*Block_dispose)(void *); | ||
| }; | ||
| #endif // __OBJC_RUNTIME_INTERNAL__ | ||
| #endif //__LIBOBJC_BLOCKS_PRIVATE_H_INCLUDED__ | ||
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