1 files changed, 63 insertions, 0 deletions
diff --git a/lib/libc/include/block_abi.h b/lib/libc/include/block_abi.h
new file mode 100644
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+++ b/lib/libc/include/block_abi.h
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+/*-
+ * Copyright (c) 2014 David T Chisnall
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifdef __BLOCKS__
+/**
+ * Declares a block variable.  This macro is defined in the trivial way for
+ * compilers that support blocks and exposing the ABI in the source for other
+ * compilers.
+ */
+#define	DECLARE_BLOCK(retTy, name, argTys, ...)\
+	retTy(^name)(argTys, ## __VA_ARGS__)
+/**
+ * Calls a block variable.  This macro is defined in the trivial way for
+ * compilers that support blocks and exposing the ABI in the source for other
+ * compilers.
+ */
+#define CALL_BLOCK(name, ...) name(__VA_ARGS__)
+#else // !__BLOCKS__
+#define	DECLARE_BLOCK(retTy, name, argTys, ...)\
+	struct {\
+		void *isa;\
+		int flags;\
+		int reserved;\
+		retTy (*invoke)(void *, ...);\
+	} *name
+#define CALL_BLOCK(name, ...) (name)->invoke(name, __VA_ARGS__)
+#endif // __BLOCKS__
+/**
+ * Returns the pointer to the block-invoke function.  This is used for passing
+ * blocks to functions that want a function pointer and a data pointer.
+ */
+#define GET_BLOCK_FUNCTION(x) \
+	(((struct {\
+		void *isa;\
+		int flags;\
+		int reserved;\
+		void (*invoke)(void *, ...);\
+	}*)(void*)x)->invoke)