Introduce _Complex conversions into the function overloading
system. Since C99 doesn't have overloading and C++ doesn't have
_Complex, there is no specification for this. Here's what I think
makes sense.
Complex conversions come in several flavors:
- Complex promotions: a complex -> complex conversion where the
underlying real-type conversion is a floating-point promotion. GCC
seems to call this a promotion, EDG does something else. This is
given "promotion" rank for determining the best viable function.
- Complex conversions: a complex -> complex conversion that is
not a complex promotion. This is given "conversion" rank for
determining the best viable function.
- Complex-real conversions: a real -> complex or complex -> real
conversion. This is given "conversion" rank for determining the
best viable function.
These rules are the same for C99 (when using the "overloadable"
attribute) and C++. However, there is one difference in the handling
of floating-point promotions: in C99, float -> long double and double
-> long double are considered promotions (so we give them "promotion"
rank), while C++ considers these conversions ("conversion" rank).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64343 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaOverload.h b/lib/Sema/SemaOverload.h
index 2511c2d..3da8eca 100644
--- a/lib/Sema/SemaOverload.h
+++ b/lib/Sema/SemaOverload.h
@@ -33,9 +33,12 @@
ICK_Qualification, ///< Qualification conversions (C++ 4.4)
ICK_Integral_Promotion, ///< Integral promotions (C++ 4.5)
ICK_Floating_Promotion, ///< Floating point promotions (C++ 4.6)
+ ICK_Complex_Promotion, ///< Complex promotions (Clang extension)
ICK_Integral_Conversion, ///< Integral conversions (C++ 4.7)
ICK_Floating_Conversion, ///< Floating point conversions (C++ 4.8)
+ ICK_Complex_Conversion, ///< Complex conversions (C99 6.3.1.6)
ICK_Floating_Integral, ///< Floating-integral conversions (C++ 4.9)
+ ICK_Complex_Real, ///< Complex-real conversions (C99 6.3.1.7)
ICK_Pointer_Conversion, ///< Pointer conversions (C++ 4.10)
ICK_Pointer_Member, ///< Pointer-to-member conversions (C++ 4.11)
ICK_Boolean_Conversion, ///< Boolean conversions (C++ 4.12)