-//===-- llvm/Attributes.h - Container for Attributes ---*---------- C++ -*-===//
+//===-- llvm/Attributes.h - Container for Attributes ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
namespace Attribute {
-/// Function parameters and results can have attributes to indicate how they
-/// should be treated by optimizations and code generation. This enumeration
-/// lists the attributes that can be associated with parameters, function
+/// Function parameters and results can have attributes to indicate how they
+/// should be treated by optimizations and code generation. This enumeration
+/// lists the attributes that can be associated with parameters, function
/// results or the function itself.
/// @brief Function attributes.
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 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.
// 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 Hotpatch = 1<<29; ///< Function should have special
+ ///'hotpatch' sequence in prologue
+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.
+
+/// 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;
-/// @brief Attributes that only apply to function.
-const Attributes FunctionOnly = NoReturn | NoUnwind | ReadNone | ReadOnly |
- NoInline | AlwaysInline | OptimizeForSize | StackProtect | StackProtectReq;
+/// @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 |
+ Hotpatch | UWTable | NonLazyBind;
/// @brief Parameter attributes that do not apply to vararg call arguments.
const Attributes VarArgsIncompatible = StructRet;
/// This turns an int alignment (a power of 2, normally) into the
/// form used internally in Attributes.
inline Attributes constructAlignmentFromInt(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 <= 0x40000000 && "Alignment too large.");
return (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)
+ return 0;
+
+ 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
-/// the mnemonics for the assembly writer.
+/// the mnemonics for the assembly writer.
/// @brief Convert attribute bits to text
std::string getAsString(Attributes Attrs);
} // end namespace Attribute
/// This is just a pair of values to associate a set of attributes
-/// with an index.
+/// with an index.
struct AttributeWithIndex {
Attributes Attrs; ///< The attributes that are set, or'd together.
unsigned Index; ///< Index of the parameter for which the attributes apply.
///< Index 0 is used for return value attributes.
///< Index ~0U is used for function attributes.
-
+
static AttributeWithIndex get(unsigned Idx, Attributes Attrs) {
AttributeWithIndex P;
P.Index = Idx;
return P;
}
};
-
+
//===----------------------------------------------------------------------===//
// AttrListPtr Smart Pointer
//===----------------------------------------------------------------------===//
class AttributeListImpl;
-
-/// AttrListPtr - This class manages the ref count for the opaque
+
+/// AttrListPtr - This class manages the ref count for the opaque
/// AttributeListImpl object and provides accessors for it.
class AttrListPtr {
/// AttrList - The attributes that we are managing. This can be null
AttrListPtr(const AttrListPtr &P);
const AttrListPtr &operator=(const AttrListPtr &RHS);
~AttrListPtr();
-
+
//===--------------------------------------------------------------------===//
// Attribute List Construction and Mutation
//===--------------------------------------------------------------------===//
-
+
/// get - Return a Attributes list with the specified parameter in it.
static AttrListPtr get(const AttributeWithIndex *Attr, unsigned NumAttrs);
-
+
/// get - Return a Attribute list with the parameters specified by the
/// consecutive random access iterator range.
template <typename Iter>
/// attribute list. Since attribute lists are immutable, this
/// returns the new list.
AttrListPtr addAttr(unsigned Idx, Attributes Attrs) const;
-
+
/// removeAttr - Remove the specified attribute at the specified index from
/// this attribute list. Since attribute lists are immutable, this
/// returns the new list.
AttrListPtr removeAttr(unsigned Idx, Attributes Attrs) const;
-
+
//===--------------------------------------------------------------------===//
// Attribute List Accessors
//===--------------------------------------------------------------------===//
/// getParamAttributes - The attributes for the specified index are
- /// returned.
+ /// returned.
Attributes getParamAttributes(unsigned Idx) const {
assert (Idx && Idx != ~0U && "Invalid parameter index!");
return getAttributes(Idx);
}
/// getRetAttributes - The attributes for the ret value are
- /// returned.
+ /// returned.
Attributes getRetAttributes() const {
return getAttributes(0);
}
/// getFnAttributes - The function attributes are returned.
Attributes getFnAttributes() const {
- return getAttributes(~0);
+ return getAttributes(~0U);
}
-
+
/// paramHasAttr - Return true if the specified parameter index has the
/// specified attribute set.
bool paramHasAttr(unsigned Idx, Attributes Attr) const {
- return getAttributes(Idx) & Attr;
+ return (getAttributes(Idx) & Attr) != 0;
}
-
+
/// getParamAlignment - Return the alignment for the specified function
/// parameter.
unsigned getParamAlignment(unsigned Idx) const {
- return 1ull << (((getAttributes(Idx) & Attribute::Alignment) >> 16) - 1);
+ return Attribute::getAlignmentFromAttrs(getAttributes(Idx));
}
-
+
/// hasAttrSomewhere - Return true if the specified attribute is set for at
/// least one parameter or for the return value.
bool hasAttrSomewhere(Attributes Attr) const;
/// operator==/!= - Provide equality predicates.
- bool operator==(const AttrListPtr &RHS) const { return AttrList == RHS.AttrList; }
- bool operator!=(const AttrListPtr &RHS) const { return AttrList != RHS.AttrList; }
-
+ bool operator==(const AttrListPtr &RHS) const
+ { return AttrList == RHS.AttrList; }
+ bool operator!=(const AttrListPtr &RHS) const
+ { return AttrList != RHS.AttrList; }
+
void dump() const;
//===--------------------------------------------------------------------===//
// Attribute List Introspection
//===--------------------------------------------------------------------===//
-
+
/// getRawPointer - Return a raw pointer that uniquely identifies this
- /// attribute list.
+ /// attribute list.
void *getRawPointer() const {
return AttrList;
}
-
+
// Attributes are stored as a dense set of slots, where there is one
// slot for each argument that has an attribute. This allows walking over the
// dense set instead of walking the sparse list of attributes.
-
+
/// isEmpty - Return true if there are no attributes.
///
bool isEmpty() const {
return AttrList == 0;
}
-
- /// getNumSlots - Return the number of slots used in this attribute list.
+
+ /// getNumSlots - Return the number of slots used in this attribute list.
/// This is the number of arguments that have an attribute set on them
/// (including the function itself).
unsigned getNumSlots() const;
-
+
/// getSlot - Return the AttributeWithIndex at the specified slot. This
/// holds a index number plus a set of attributes.
const AttributeWithIndex &getSlot(unsigned Slot) const;
-
+
private:
explicit AttrListPtr(AttributeListImpl *L);
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