diff options
Diffstat (limited to 'contrib/llvm/include/llvm/Attributes.h')
| -rw-r--r-- | contrib/llvm/include/llvm/Attributes.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/contrib/llvm/include/llvm/Attributes.h b/contrib/llvm/include/llvm/Attributes.h index da6188b1a8ea..8b69d6ecc16a 100644 --- a/contrib/llvm/include/llvm/Attributes.h +++ b/contrib/llvm/include/llvm/Attributes.h @@ -67,6 +67,20 @@ const Attributes StackAlignment = 7<<26; ///< Alignment of stack for ///alignstack(1)) const Attributes Hotpatch = 1<<29; ///< Function should have special ///'hotpatch' sequence in prologue +const Attributes UWTable = 1<<30; ///< Function must be in a unwind + ///table + +/// 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; @@ -76,7 +90,7 @@ const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture; const Attributes FunctionOnly = NoReturn | NoUnwind | ReadNone | ReadOnly | NoInline | AlwaysInline | OptimizeForSize | StackProtect | StackProtectReq | NoRedZone | NoImplicitFloat | Naked | InlineHint | StackAlignment | - Hotpatch; + Hotpatch | UWTable; /// @brief Parameter attributes that do not apply to vararg call arguments. const Attributes VarArgsIncompatible = StructRet; |