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Don't use static CTORs for the Attributes constants, while still keeping the class type-safe

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150031 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2012-02-08 01:11:21 +00:00
parent 4fe3457292
commit 55fb5bcc62
1 changed files with 78 additions and 48 deletions
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126
include/llvm/Attributes.h
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@ -22,11 +22,29 @@
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.
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; }
@ -73,45 +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.
const Attributes AddressSafety(1ULL<<32); ///< Address safety checking is on.
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
@ -126,24 +154,26 @@ const Attributes AddressSafety(1ULL<<32); ///< Address safety checking is on.
/// 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 | AddressSafety;
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.