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62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
/*-
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* Copyright (c) 2014 David T Chisnall
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef __BLOCKS__
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/**
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* Declares a block variable. This macro is defined in the trivial way for
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* compilers that support blocks and exposing the ABI in the source for other
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* compilers.
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*/
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#define DECLARE_BLOCK(retTy, name, argTys, ...)\
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retTy(^name)(argTys, ## __VA_ARGS__)
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/**
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* Calls a block variable. This macro is defined in the trivial way for
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* compilers that support blocks and exposing the ABI in the source for other
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* compilers.
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*/
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#define CALL_BLOCK(name, ...) name(__VA_ARGS__)
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#else // !__BLOCKS__
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#define DECLARE_BLOCK(retTy, name, argTys, ...)\
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struct {\
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void *isa;\
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int flags;\
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int reserved;\
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retTy (*invoke)(void *, ...);\
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} *name
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#define CALL_BLOCK(name, ...) (name)->invoke(name, __VA_ARGS__)
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#endif // __BLOCKS__
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/**
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* Returns the pointer to the block-invoke function. This is used for passing
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* blocks to functions that want a function pointer and a data pointer.
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*/
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#define GET_BLOCK_FUNCTION(x) \
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(((struct {\
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void *isa;\
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int flags;\
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int reserved;\
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void (*invoke)(void *, ...);\
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}*)(void*)x)->invoke)
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