-namespace Attribute {
-
-/// Function parameters and results can have attributes to indicate how they
-/// should be treated by optimizations and code generation. This enumeration
-/// lists the attributes that can be associated with parameters, function
-/// results or the function itself.
-/// @brief Function attributes.
-
-const Attributes None (0); ///< No attributes have been set
-const Attributes ZExt (1<<0); ///< Zero extended before/after call
-const Attributes SExt (1<<1); ///< Sign extended before/after call
-const Attributes NoReturn (1<<2); ///< Mark the function as not returning
-const Attributes InReg (1<<3); ///< Force argument to be passed in register
-const Attributes StructRet (1<<4); ///< Hidden pointer to structure to return
-const Attributes NoUnwind (1<<5); ///< Function doesn't unwind stack
-const Attributes NoAlias (1<<6); ///< Considered to not alias after call
-const Attributes ByVal (1<<7); ///< Pass structure by value
-const Attributes Nest (1<<8); ///< Nested function static chain
-const Attributes ReadNone (1<<9); ///< Function does not access memory
-const Attributes ReadOnly (1<<10); ///< Function only reads from memory
-const Attributes NoInline (1<<11); ///< inline=never
-const Attributes AlwaysInline (1<<12); ///< inline=always
-const Attributes OptimizeForSize (1<<13); ///< opt_size
-const Attributes StackProtect (1<<14); ///< Stack protection.
-const Attributes StackProtectReq (1<<15); ///< Stack protection required.
-const Attributes Alignment (31<<16); ///< Alignment of parameter (5 bits)
- // stored as log2 of alignment with +1 bias
- // 0 means unaligned different from align 1
-const Attributes NoCapture (1<<21); ///< Function creates no aliases of pointer
-const Attributes NoRedZone (1<<22); /// disable redzone
-const Attributes NoImplicitFloat (1<<23); /// disable implicit floating point
- /// instructions.
-const Attributes Naked (1<<24); ///< Naked function
-const Attributes InlineHint (1<<25); ///< source said inlining was
- ///desirable
-const Attributes StackAlignment (7<<26); ///< Alignment of stack for
- ///function (3 bits) stored as log2
- ///of alignment with +1 bias
- ///0 means unaligned (different from
- ///alignstack(1))
-const Attributes ReturnsTwice (1<<29); ///< Function can return twice
-const Attributes UWTable (1<<30); ///< Function must be in a unwind
- ///table
-const Attributes NonLazyBind (1U<<31); ///< Function is called early and/or
- /// often, so lazy binding isn't
- /// worthwhile.
-const Attributes AddressSafety(1ULL<<32); ///< Address safety checking is on.
-
-/// Note that uwtable is about the ABI or the user mandating an entry in the
-/// unwind table. The nounwind attribute is about an exception passing by the
-/// function.
-/// In a theoretical system that uses tables for profiling and sjlj for
-/// exceptions, they would be fully independent. In a normal system that
-/// uses tables for both, the semantics are:
-/// nil = Needs an entry because an exception might pass by.
-/// nounwind = No need for an entry
-/// uwtable = Needs an entry because the ABI says so and because
-/// an exception might pass by.
-/// uwtable + nounwind = Needs an entry because the ABI says so.
-
-/// @brief Attributes that only apply to function parameters.
-const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture;
-
-/// @brief Attributes that may be applied to the function itself. These cannot
-/// be used on return values or function parameters.
-const Attributes FunctionOnly = NoReturn | NoUnwind | ReadNone | ReadOnly |
- NoInline | AlwaysInline | OptimizeForSize | StackProtect | StackProtectReq |
- NoRedZone | NoImplicitFloat | Naked | InlineHint | StackAlignment |
- UWTable | NonLazyBind | ReturnsTwice | AddressSafety;
-
-/// @brief Parameter attributes that do not apply to vararg call arguments.
-const Attributes VarArgsIncompatible = StructRet;
-
-/// @brief Attributes that are mutually incompatible.
-const Attributes MutuallyIncompatible[4] = {
- ByVal | InReg | Nest | StructRet,
- ZExt | SExt,
- ReadNone | ReadOnly,
- NoInline | AlwaysInline