diff options
Diffstat (limited to 'include/llvm/Attributes.h')
| -rw-r--r-- | include/llvm/Attributes.h | 185 |
1 files changed, 128 insertions, 57 deletions
diff --git a/include/llvm/Attributes.h b/include/llvm/Attributes.h index 2d7b33b29bcf..0099f173b626 100644 --- a/include/llvm/Attributes.h +++ b/include/llvm/Attributes.h @@ -22,8 +22,66 @@ namespace llvm { class Type; +namespace Attribute { +/// We use this proxy POD type to allow constructing Attributes constants +/// using initializer lists. Do not use this class directly. +struct AttrConst { + uint64_t v; + AttrConst operator | (const AttrConst Attrs) const { + AttrConst Res = {v | Attrs.v}; + return Res; + } + AttrConst operator ~ () const { + AttrConst Res = {~v}; + return Res; + } +}; +} // namespace Attribute + + /// Attributes - A bitset of attributes. -typedef unsigned Attributes; +class Attributes { + public: + Attributes() : Bits(0) { } + explicit Attributes(uint64_t Val) : Bits(Val) { } + /*implicit*/ Attributes(Attribute::AttrConst Val) : Bits(Val.v) { } + Attributes(const Attributes &Attrs) : Bits(Attrs.Bits) { } + // This is a "safe bool() operator". + operator const void *() const { return Bits ? this : 0; } + bool isEmptyOrSingleton() const { return (Bits & (Bits - 1)) == 0; } + Attributes &operator = (const Attributes &Attrs) { + Bits = Attrs.Bits; + return *this; + } + bool operator == (const Attributes &Attrs) const { + return Bits == Attrs.Bits; + } + bool operator != (const Attributes &Attrs) const { + return Bits != Attrs.Bits; + } + Attributes operator | (const Attributes &Attrs) const { + return Attributes(Bits | Attrs.Bits); + } + Attributes operator & (const Attributes &Attrs) const { + return Attributes(Bits & Attrs.Bits); + } + Attributes operator ^ (const Attributes &Attrs) const { + return Attributes(Bits ^ Attrs.Bits); + } + Attributes &operator |= (const Attributes &Attrs) { + Bits |= Attrs.Bits; + return *this; + } + Attributes &operator &= (const Attributes &Attrs) { + Bits &= Attrs.Bits; + return *this; + } + Attributes operator ~ () const { return Attributes(~Bits); } + uint64_t Raw() const { return Bits; } + private: + // Currently, we need less than 64 bits. + uint64_t Bits; +}; namespace Attribute { @@ -33,44 +91,55 @@ namespace Attribute { /// 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) +// We declare AttrConst objects that will be used throughout the code +// and also raw uint64_t objects with _i suffix to be used below for other +// constant declarations. This is done to avoid static CTORs and at the same +// time to keep type-safety of Attributes. +#define DECLARE_LLVM_ATTRIBUTE(name, value) \ + const uint64_t name##_i = value; \ + const AttrConst name = {value}; + +DECLARE_LLVM_ATTRIBUTE(None,0) ///< No attributes have been set +DECLARE_LLVM_ATTRIBUTE(ZExt,1<<0) ///< Zero extended before/after call +DECLARE_LLVM_ATTRIBUTE(SExt,1<<1) ///< Sign extended before/after call +DECLARE_LLVM_ATTRIBUTE(NoReturn,1<<2) ///< Mark the function as not returning +DECLARE_LLVM_ATTRIBUTE(InReg,1<<3) ///< Force argument to be passed in register +DECLARE_LLVM_ATTRIBUTE(StructRet,1<<4) ///< Hidden pointer to structure to return +DECLARE_LLVM_ATTRIBUTE(NoUnwind,1<<5) ///< Function doesn't unwind stack +DECLARE_LLVM_ATTRIBUTE(NoAlias,1<<6) ///< Considered to not alias after call +DECLARE_LLVM_ATTRIBUTE(ByVal,1<<7) ///< Pass structure by value +DECLARE_LLVM_ATTRIBUTE(Nest,1<<8) ///< Nested function static chain +DECLARE_LLVM_ATTRIBUTE(ReadNone,1<<9) ///< Function does not access memory +DECLARE_LLVM_ATTRIBUTE(ReadOnly,1<<10) ///< Function only reads from memory +DECLARE_LLVM_ATTRIBUTE(NoInline,1<<11) ///< inline=never +DECLARE_LLVM_ATTRIBUTE(AlwaysInline,1<<12) ///< inline=always +DECLARE_LLVM_ATTRIBUTE(OptimizeForSize,1<<13) ///< opt_size +DECLARE_LLVM_ATTRIBUTE(StackProtect,1<<14) ///< Stack protection. +DECLARE_LLVM_ATTRIBUTE(StackProtectReq,1<<15) ///< Stack protection required. +DECLARE_LLVM_ATTRIBUTE(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. +DECLARE_LLVM_ATTRIBUTE(NoCapture,1<<21) ///< Function creates no aliases of pointer +DECLARE_LLVM_ATTRIBUTE(NoRedZone,1<<22) /// disable redzone +DECLARE_LLVM_ATTRIBUTE(NoImplicitFloat,1<<23) /// disable implicit floating point + /// instructions. +DECLARE_LLVM_ATTRIBUTE(Naked,1<<24) ///< Naked function +DECLARE_LLVM_ATTRIBUTE(InlineHint,1<<25) ///< source said inlining was + ///desirable +DECLARE_LLVM_ATTRIBUTE(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)) +DECLARE_LLVM_ATTRIBUTE(ReturnsTwice,1<<29) ///< Function can return twice +DECLARE_LLVM_ATTRIBUTE(UWTable,1<<30) ///< Function must be in a unwind + ///table +DECLARE_LLVM_ATTRIBUTE(NonLazyBind,1U<<31) ///< Function is called early and/or + /// often, so lazy binding isn't + /// worthwhile. +DECLARE_LLVM_ATTRIBUTE(AddressSafety,1ULL<<32) ///< Address safety checking is on. + +#undef DECLARE_LLVM_ATTRIBUTE /// 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 @@ -85,24 +154,26 @@ const Attributes NonLazyBind = 1U<<31; ///< Function is called early and/or /// 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; +const AttrConst ParameterOnly = {ByVal_i | Nest_i | + StructRet_i | NoCapture_i}; /// @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; +const AttrConst FunctionOnly = {NoReturn_i | NoUnwind_i | ReadNone_i | + ReadOnly_i | NoInline_i | AlwaysInline_i | OptimizeForSize_i | + StackProtect_i | StackProtectReq_i | NoRedZone_i | NoImplicitFloat_i | + Naked_i | InlineHint_i | StackAlignment_i | + UWTable_i | NonLazyBind_i | ReturnsTwice_i | AddressSafety_i}; /// @brief Parameter attributes that do not apply to vararg call arguments. -const Attributes VarArgsIncompatible = StructRet; +const AttrConst VarArgsIncompatible = {StructRet_i}; /// @brief Attributes that are mutually incompatible. -const Attributes MutuallyIncompatible[4] = { - ByVal | InReg | Nest | StructRet, - ZExt | SExt, - ReadNone | ReadOnly, - NoInline | AlwaysInline +const AttrConst MutuallyIncompatible[4] = { + {ByVal_i | InReg_i | Nest_i | StructRet_i}, + {ZExt_i | SExt_i}, + {ReadNone_i | ReadOnly_i}, + {NoInline_i | AlwaysInline_i} }; /// @brief Which attributes cannot be applied to a type. @@ -113,20 +184,20 @@ Attributes typeIncompatible(Type *Ty); inline Attributes constructAlignmentFromInt(unsigned i) { // Default alignment, allow the target to define how to align it. if (i == 0) - return 0; + return None; assert(isPowerOf2_32(i) && "Alignment must be a power of two."); assert(i <= 0x40000000 && "Alignment too large."); - return (Log2_32(i)+1) << 16; + return Attributes((Log2_32(i)+1) << 16); } /// This returns the alignment field of an attribute as a byte alignment value. inline unsigned getAlignmentFromAttrs(Attributes A) { Attributes Align = A & Attribute::Alignment; - if (Align == 0) + if (!Align) return 0; - return 1U << ((Align >> 16) - 1); + return 1U << ((Align.Raw() >> 16) - 1); } /// This turns an int stack alignment (which must be a power of 2) into @@ -134,21 +205,21 @@ inline unsigned getAlignmentFromAttrs(Attributes A) { inline Attributes constructStackAlignmentFromInt(unsigned i) { // Default alignment, allow the target to define how to align it. if (i == 0) - return 0; + return None; assert(isPowerOf2_32(i) && "Alignment must be a power of two."); assert(i <= 0x100 && "Alignment too large."); - return (Log2_32(i)+1) << 26; + return Attributes((Log2_32(i)+1) << 26); } /// This returns the stack alignment field of an attribute as a byte alignment /// value. inline unsigned getStackAlignmentFromAttrs(Attributes A) { Attributes StackAlign = A & Attribute::StackAlignment; - if (StackAlign == 0) + if (!StackAlign) return 0; - return 1U << ((StackAlign >> 26) - 1); + return 1U << ((StackAlign.Raw() >> 26) - 1); } @@ -242,7 +313,7 @@ public: /// paramHasAttr - Return true if the specified parameter index has the /// specified attribute set. bool paramHasAttr(unsigned Idx, Attributes Attr) const { - return (getAttributes(Idx) & Attr) != 0; + return getAttributes(Idx) & Attr; } /// getParamAlignment - Return the alignment for the specified function |