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Don't use static CTORs for the Attributes constants, while still keeping the class type-safe
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150031 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -22,11 +22,29 @@
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namespace llvm {
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class Type;
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namespace Attribute {
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/// We use this proxy POD type to allow constructing Attributes constants
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/// using initializer lists. Do not use this class directly.
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struct AttrConst {
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uint64_t v;
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AttrConst operator | (const AttrConst Attrs) const {
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AttrConst Res = {v | Attrs.v};
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return Res;
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}
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AttrConst operator ~ () const {
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AttrConst Res = {~v};
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return Res;
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}
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};
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} // namespace Attribute
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/// Attributes - A bitset of attributes.
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class Attributes {
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public:
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Attributes() : Bits(0) { }
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explicit Attributes(uint64_t Val) : Bits(Val) { }
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/*implicit*/ Attributes(Attribute::AttrConst Val) : Bits(Val.v) { }
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Attributes(const Attributes &Attrs) : Bits(Attrs.Bits) { }
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// This is a "safe bool() operator".
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operator const void *() const { return Bits ? this : 0; }
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@ -73,45 +91,55 @@ namespace Attribute {
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/// results or the function itself.
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/// @brief Function attributes.
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const Attributes None (0); ///< No attributes have been set
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const Attributes ZExt (1<<0); ///< Zero extended before/after call
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const Attributes SExt (1<<1); ///< Sign extended before/after call
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const Attributes NoReturn (1<<2); ///< Mark the function as not returning
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const Attributes InReg (1<<3); ///< Force argument to be passed in register
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const Attributes StructRet (1<<4); ///< Hidden pointer to structure to return
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const Attributes NoUnwind (1<<5); ///< Function doesn't unwind stack
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const Attributes NoAlias (1<<6); ///< Considered to not alias after call
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const Attributes ByVal (1<<7); ///< Pass structure by value
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const Attributes Nest (1<<8); ///< Nested function static chain
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const Attributes ReadNone (1<<9); ///< Function does not access memory
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const Attributes ReadOnly (1<<10); ///< Function only reads from memory
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const Attributes NoInline (1<<11); ///< inline=never
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const Attributes AlwaysInline (1<<12); ///< inline=always
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const Attributes OptimizeForSize (1<<13); ///< opt_size
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const Attributes StackProtect (1<<14); ///< Stack protection.
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const Attributes StackProtectReq (1<<15); ///< Stack protection required.
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const Attributes Alignment (31<<16); ///< Alignment of parameter (5 bits)
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// We declare AttrConst objects that will be used throughout the code
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// and also raw uint64_t objects with _i suffix to be used below for other
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// constant declarations. This is done to avoid static CTORs and at the same
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// time to keep type-safety of Attributes.
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#define DECLARE_LLVM_ATTRIBUTE(name, value) \
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const uint64_t name##_i = value; \
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const AttrConst name = {value};
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DECLARE_LLVM_ATTRIBUTE(None,0) ///< No attributes have been set
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DECLARE_LLVM_ATTRIBUTE(ZExt,1<<0) ///< Zero extended before/after call
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DECLARE_LLVM_ATTRIBUTE(SExt,1<<1) ///< Sign extended before/after call
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DECLARE_LLVM_ATTRIBUTE(NoReturn,1<<2) ///< Mark the function as not returning
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DECLARE_LLVM_ATTRIBUTE(InReg,1<<3) ///< Force argument to be passed in register
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DECLARE_LLVM_ATTRIBUTE(StructRet,1<<4) ///< Hidden pointer to structure to return
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DECLARE_LLVM_ATTRIBUTE(NoUnwind,1<<5) ///< Function doesn't unwind stack
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DECLARE_LLVM_ATTRIBUTE(NoAlias,1<<6) ///< Considered to not alias after call
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DECLARE_LLVM_ATTRIBUTE(ByVal,1<<7) ///< Pass structure by value
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DECLARE_LLVM_ATTRIBUTE(Nest,1<<8) ///< Nested function static chain
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DECLARE_LLVM_ATTRIBUTE(ReadNone,1<<9) ///< Function does not access memory
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DECLARE_LLVM_ATTRIBUTE(ReadOnly,1<<10) ///< Function only reads from memory
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DECLARE_LLVM_ATTRIBUTE(NoInline,1<<11) ///< inline=never
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DECLARE_LLVM_ATTRIBUTE(AlwaysInline,1<<12) ///< inline=always
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DECLARE_LLVM_ATTRIBUTE(OptimizeForSize,1<<13) ///< opt_size
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DECLARE_LLVM_ATTRIBUTE(StackProtect,1<<14) ///< Stack protection.
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DECLARE_LLVM_ATTRIBUTE(StackProtectReq,1<<15) ///< Stack protection required.
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DECLARE_LLVM_ATTRIBUTE(Alignment,31<<16) ///< Alignment of parameter (5 bits)
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// stored as log2 of alignment with +1 bias
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// 0 means unaligned different from align 1
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const Attributes NoCapture (1<<21); ///< Function creates no aliases of pointer
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const Attributes NoRedZone (1<<22); /// disable redzone
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const Attributes NoImplicitFloat (1<<23); /// disable implicit floating point
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/// instructions.
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const Attributes Naked (1<<24); ///< Naked function
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const Attributes InlineHint (1<<25); ///< source said inlining was
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///desirable
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const Attributes StackAlignment (7<<26); ///< Alignment of stack for
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///function (3 bits) stored as log2
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///of alignment with +1 bias
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///0 means unaligned (different from
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///alignstack(1))
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const Attributes ReturnsTwice (1<<29); ///< Function can return twice
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const Attributes UWTable (1<<30); ///< Function must be in a unwind
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///table
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const Attributes NonLazyBind (1U<<31); ///< Function is called early and/or
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/// often, so lazy binding isn't
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/// worthwhile.
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const Attributes AddressSafety(1ULL<<32); ///< Address safety checking is on.
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DECLARE_LLVM_ATTRIBUTE(NoCapture,1<<21) ///< Function creates no aliases of pointer
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DECLARE_LLVM_ATTRIBUTE(NoRedZone,1<<22) /// disable redzone
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DECLARE_LLVM_ATTRIBUTE(NoImplicitFloat,1<<23) /// disable implicit floating point
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/// instructions.
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DECLARE_LLVM_ATTRIBUTE(Naked,1<<24) ///< Naked function
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DECLARE_LLVM_ATTRIBUTE(InlineHint,1<<25) ///< source said inlining was
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///desirable
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DECLARE_LLVM_ATTRIBUTE(StackAlignment,7<<26) ///< Alignment of stack for
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///function (3 bits) stored as log2
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///of alignment with +1 bias
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///0 means unaligned (different from
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///alignstack= {1))
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DECLARE_LLVM_ATTRIBUTE(ReturnsTwice,1<<29) ///< Function can return twice
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DECLARE_LLVM_ATTRIBUTE(UWTable,1<<30) ///< Function must be in a unwind
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///table
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DECLARE_LLVM_ATTRIBUTE(NonLazyBind,1U<<31) ///< Function is called early and/or
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/// often, so lazy binding isn't
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/// worthwhile.
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DECLARE_LLVM_ATTRIBUTE(AddressSafety,1ULL<<32) ///< Address safety checking is on.
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#undef DECLARE_LLVM_ATTRIBUTE
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/// Note that uwtable is about the ABI or the user mandating an entry in the
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/// unwind table. The nounwind attribute is about an exception passing by the
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@ -126,24 +154,26 @@ const Attributes AddressSafety(1ULL<<32); ///< Address safety checking is on.
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/// uwtable + nounwind = Needs an entry because the ABI says so.
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/// @brief Attributes that only apply to function parameters.
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const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture;
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const AttrConst ParameterOnly = {ByVal_i | Nest_i |
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StructRet_i | NoCapture_i};
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/// @brief Attributes that may be applied to the function itself. These cannot
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/// be used on return values or function parameters.
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const Attributes FunctionOnly = NoReturn | NoUnwind | ReadNone | ReadOnly |
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NoInline | AlwaysInline | OptimizeForSize | StackProtect | StackProtectReq |
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NoRedZone | NoImplicitFloat | Naked | InlineHint | StackAlignment |
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UWTable | NonLazyBind | ReturnsTwice | AddressSafety;
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const AttrConst FunctionOnly = {NoReturn_i | NoUnwind_i | ReadNone_i |
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ReadOnly_i | NoInline_i | AlwaysInline_i | OptimizeForSize_i |
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StackProtect_i | StackProtectReq_i | NoRedZone_i | NoImplicitFloat_i |
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Naked_i | InlineHint_i | StackAlignment_i |
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UWTable_i | NonLazyBind_i | ReturnsTwice_i | AddressSafety_i};
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/// @brief Parameter attributes that do not apply to vararg call arguments.
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const Attributes VarArgsIncompatible = StructRet;
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const AttrConst VarArgsIncompatible = {StructRet_i};
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/// @brief Attributes that are mutually incompatible.
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const Attributes MutuallyIncompatible[4] = {
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ByVal | InReg | Nest | StructRet,
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ZExt | SExt,
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ReadNone | ReadOnly,
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NoInline | AlwaysInline
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const AttrConst MutuallyIncompatible[4] = {
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{ByVal_i | InReg_i | Nest_i | StructRet_i},
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{ZExt_i | SExt_i},
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{ReadNone_i | ReadOnly_i},
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{NoInline_i | AlwaysInline_i}
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};
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/// @brief Which attributes cannot be applied to a type.
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