diff options
Diffstat (limited to 'include/llvm/Attributes.h')
| -rw-r--r-- | include/llvm/Attributes.h | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/include/llvm/Attributes.h b/include/llvm/Attributes.h index 068f81f..1296d67 100644 --- a/include/llvm/Attributes.h +++ b/include/llvm/Attributes.h @@ -60,6 +60,11 @@ const Attributes NoImplicitFloat = 1<<23; /// disable implicit floating point 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)) /// @brief Attributes that only apply to function parameters. const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture; @@ -68,7 +73,7 @@ const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture; /// be used on return values or function parameters. const Attributes FunctionOnly = NoReturn | NoUnwind | ReadNone | ReadOnly | NoInline | AlwaysInline | OptimizeForSize | StackProtect | StackProtectReq | - NoRedZone | NoImplicitFloat | Naked | InlineHint; + NoRedZone | NoImplicitFloat | Naked | InlineHint | StackAlignment; /// @brief Parameter attributes that do not apply to vararg call arguments. const Attributes VarArgsIncompatible = StructRet; @@ -105,6 +110,28 @@ inline unsigned getAlignmentFromAttrs(Attributes A) { return 1U << ((Align >> 16) - 1); } +/// This turns an int stack alignment (which must be a power of 2) into +/// the form used internally in Attributes. +inline Attributes constructStackAlignmentFromInt(unsigned i) { + // Default alignment, allow the target to define how to align it. + if (i == 0) + return 0; + + assert(isPowerOf2_32(i) && "Alignment must be a power of two."); + assert(i <= 0x100 && "Alignment too large."); + return (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) + return 0; + + return 1U << ((StackAlign >> 26) - 1); +} + /// The set of Attributes set in Attributes is converted to a /// string of equivalent mnemonics. This is, presumably, for writing out |