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Automatically change MANGLE() into named inline asm operands when direct symbol reference in inline asm are not supported.

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This is part of the patch-set for intel C inline asm on windows support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Matt Oliver
2014-03-18 15:53:26 +11:00
committed by Michael Niedermayer
parent b2d3a45598
commit 8236747511
16 changed files with 99 additions and 4 deletions
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36
libavutil/x86/asm.h
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@@ -107,6 +107,40 @@ typedef int x86_reg;
# define LOCAL_MANGLE(a) #a
#endif
#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
#if HAVE_INLINE_ASM_DIRECT_SYMBOL_REFS
# define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
# define NAMED_CONSTRAINTS_ADD(...)
# define NAMED_CONSTRAINTS(...)
#else
/* When direct symbol references are used in code passed to a compiler that does not support them
* then these references need to be converted to named asm constraints instead.
* Instead of returning a direct symbol MANGLE now returns a named constraint for that specific symbol.
* In order for this to work there must also be a corresponding entry in the asm-interface. To add this
* entry use the macro NAMED_CONSTRAINTS() and pass in a list of each symbol reference used in the
* corresponding block of code. (e.g. NAMED_CONSTRAINTS(var1,var2,var3) where var1 is the first symbol etc. ).
* If there are already existing constraints then use NAMED_CONSTRAINTS_ADD to add to the existing constraint list.
*/
# define MANGLE(a) "%["#a"]"
// Intel/MSVC does not correctly expand va-args so we need a rather ugly hack in order to get it to work
# define FE_0(P,X) P(X)
# define FE_1(P,X,X1) P(X), FE_0(P,X1)
# define FE_2(P,X,X1,X2) P(X), FE_1(P,X1,X2)
# define FE_3(P,X,X1,X2,X3) P(X), FE_2(P,X1,X2,X3)
# define FE_4(P,X,X1,X2,X3,X4) P(X), FE_3(P,X1,X2,X3,X4)
# define FE_5(P,X,X1,X2,X3,X4,X5) P(X), FE_4(P,X1,X2,X3,X4,X5)
# define FE_6(P,X,X1,X2,X3,X4,X5,X6) P(X), FE_5(P,X1,X2,X3,X4,X5,X6)
# define FE_7(P,X,X1,X2,X3,X4,X5,X6,X7) P(X), FE_6(P,X1,X2,X3,X4,X5,X6,X7)
# define FE_8(P,X,X1,X2,X3,X4,X5,X6,X7,X8) P(X), FE_7(P,X1,X2,X3,X4,X5,X6,X7,X8)
# define FE_9(P,X,X1,X2,X3,X4,X5,X6,X7,X8,X9) P(X), FE_8(P,X1,X2,X3,X4,X5,X6,X7,X8,X9)
# define GET_FE_IMPL(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,NAME,...) NAME
# define GET_FE(A) GET_FE_IMPL A
# define GET_FE_GLUE(x, y) x y
# define FOR_EACH_VA(P,...) GET_FE_GLUE(GET_FE((__VA_ARGS__,FE_9,FE_8,FE_7,FE_6,FE_5,FE_4,FE_3,FE_2,FE_1,FE_0)), (P,__VA_ARGS__))
# define NAME_CONSTRAINT(x) [x] "m"(x)
// Parameters are a list of each symbol reference required
# define NAMED_CONSTRAINTS_ADD(...) , FOR_EACH_VA(NAME_CONSTRAINT,__VA_ARGS__)
// Same but without comma for when there are no previously defined constraints
# define NAMED_CONSTRAINTS(...) FOR_EACH_VA(NAME_CONSTRAINT,__VA_ARGS__)
#endif
#endif /* AVUTIL_X86_ASM_H */