#ifndef LLVM_ATTRIBUTES_H
#define LLVM_ATTRIBUTES_H
+#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
#include <string>
namespace llvm {
+
+class AttrBuilder;
+class AttributesImpl;
+class LLVMContext;
class Type;
/// Attributes - A bitset of attributes.
-typedef unsigned Attributes;
-
-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
-/// 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)
- // 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
-
-/// @brief Attributes that only apply to function parameters.
-const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture;
-
-/// @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;
-
-/// @brief Parameter attributes that do not apply to vararg call arguments.
-const Attributes VarArgsIncompatible = StructRet;
-
-/// @brief Attributes that are mutually incompatible.
-const Attributes MutuallyIncompatible[4] = {
- ByVal | InReg | Nest | StructRet,
- ZExt | SExt,
- ReadNone | ReadOnly,
- NoInline | AlwaysInline
-};
+class Attributes {
+public:
+ /// 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.
+ ///
+ /// 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.
+
+ enum AttrVal {
+ // IR-Level Attributes
+ None, ///< No attributes have been set
+ AddressSafety, ///< Address safety checking is on.
+ Alignment, ///< Alignment of parameter (5 bits)
+ ///< stored as log2 of alignment with +1 bias
+ ///< 0 means unaligned different from align 1
+ AlwaysInline, ///< inline=always
+ ByVal, ///< Pass structure by value
+ InlineHint, ///< Source said inlining was desirable
+ InReg, ///< Force argument to be passed in register
+ MinSize, ///< Function must be optimized for size first
+ Naked, ///< Naked function
+ Nest, ///< Nested function static chain
+ NoAlias, ///< Considered to not alias after call
+ NoCapture, ///< Function creates no aliases of pointer
+ NoImplicitFloat, ///< Disable implicit floating point insts
+ NoInline, ///< inline=never
+ NonLazyBind, ///< Function is called early and/or
+ ///< often, so lazy binding isn't worthwhile
+ NoRedZone, ///< Disable redzone
+ NoReturn, ///< Mark the function as not returning
+ NoUnwind, ///< Function doesn't unwind stack
+ OptimizeForSize, ///< opt_size
+ ReadNone, ///< Function does not access memory
+ ReadOnly, ///< Function only reads from memory
+ ReturnsTwice, ///< Function can return twice
+ SExt, ///< Sign extended before/after call
+ StackAlignment, ///< Alignment of stack for function (3 bits)
+ ///< stored as log2 of alignment with +1 bias 0
+ ///< means unaligned (different from
+ ///< alignstack={1))
+ StackProtect, ///< Stack protection.
+ StackProtectReq, ///< Stack protection required.
+ StructRet, ///< Hidden pointer to structure to return
+ UWTable, ///< Function must be in a unwind table
+ ZExt ///< Zero extended before/after call
+ };
+private:
+ AttributesImpl *Attrs;
+ Attributes(AttributesImpl *A) : Attrs(A) {}
+public:
+ Attributes() : Attrs(0) {}
-/// @brief Which attributes cannot be applied to a type.
-Attributes typeIncompatible(const Type *Ty);
+ /// get - Return a uniquified Attributes object. This takes the uniquified
+ /// value from the Builder and wraps it in the Attributes class.
+ static Attributes get(LLVMContext &Context, ArrayRef<AttrVal> Vals);
+ static Attributes get(LLVMContext &Context, AttrBuilder &B);
-/// 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;
+ /// @brief Return true if the attribute is present.
+ bool hasAttribute(AttrVal Val) const;
- assert(isPowerOf2_32(i) && "Alignment must be a power of two.");
- assert(i <= 0x40000000 && "Alignment too large.");
- return (Log2_32(i)+1) << 16;
-}
+ /// @brief Return true if attributes exist
+ bool hasAttributes() const;
-/// 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;
+ /// @brief Return true if the attributes are a non-null intersection.
+ bool hasAttributes(const Attributes &A) const;
- return 1U << ((Align >> 16) - 1);
-}
+ /// @brief Returns the alignment field of an attribute as a byte alignment
+ /// value.
+ unsigned getAlignment() const;
+ /// @brief Returns the stack alignment field of an attribute as a byte
+ /// alignment value.
+ unsigned getStackAlignment() const;
-/// 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.
-/// @brief Convert attribute bits to text
-std::string getAsString(Attributes Attrs);
-} // end namespace Attribute
+ /// @brief Parameter attributes that do not apply to vararg call arguments.
+ bool hasIncompatibleWithVarArgsAttrs() const {
+ return hasAttribute(Attributes::StructRet);
+ }
-/// This is just a pair of values to associate a set of attributes
-/// 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.
+ /// @brief Attributes that only apply to function parameters.
+ bool hasParameterOnlyAttrs() const {
+ return hasAttribute(Attributes::ByVal) ||
+ hasAttribute(Attributes::Nest) ||
+ hasAttribute(Attributes::StructRet) ||
+ hasAttribute(Attributes::NoCapture);
+ }
+
+ /// @brief Attributes that may be applied to the function itself. These cannot
+ /// be used on return values or function parameters.
+ bool hasFunctionOnlyAttrs() const {
+ return hasAttribute(Attributes::NoReturn) ||
+ hasAttribute(Attributes::NoUnwind) ||
+ hasAttribute(Attributes::ReadNone) ||
+ hasAttribute(Attributes::ReadOnly) ||
+ hasAttribute(Attributes::NoInline) ||
+ hasAttribute(Attributes::AlwaysInline) ||
+ hasAttribute(Attributes::OptimizeForSize) ||
+ hasAttribute(Attributes::StackProtect) ||
+ hasAttribute(Attributes::StackProtectReq) ||
+ hasAttribute(Attributes::NoRedZone) ||
+ hasAttribute(Attributes::NoImplicitFloat) ||
+ hasAttribute(Attributes::Naked) ||
+ hasAttribute(Attributes::InlineHint) ||
+ hasAttribute(Attributes::StackAlignment) ||
+ hasAttribute(Attributes::UWTable) ||
+ hasAttribute(Attributes::NonLazyBind) ||
+ hasAttribute(Attributes::ReturnsTwice) ||
+ hasAttribute(Attributes::AddressSafety) ||
+ hasAttribute(Attributes::MinSize);
+ }
+
+ bool operator==(const Attributes &A) const {
+ return Attrs == A.Attrs;
+ }
+ bool operator!=(const Attributes &A) const {
+ return Attrs != A.Attrs;
+ }
+
+ uint64_t Raw() const;
+
+ /// @brief Which attributes cannot be applied to a type.
+ static Attributes typeIncompatible(Type *Ty);
+
+ /// encodeLLVMAttributesForBitcode - This returns an integer containing an
+ /// encoding of all the LLVM attributes found in the given attribute bitset.
+ /// Any change to this encoding is a breaking change to bitcode compatibility.
+ static uint64_t encodeLLVMAttributesForBitcode(Attributes Attrs);
+
+ /// decodeLLVMAttributesForBitcode - This returns an attribute bitset
+ /// containing the LLVM attributes that have been decoded from the given
+ /// integer. This function must stay in sync with
+ /// 'encodeLLVMAttributesForBitcode'.
+ static Attributes decodeLLVMAttributesForBitcode(LLVMContext &C,
+ uint64_t EncodedAttrs);
+
+ /// getAsString - 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.
+ /// @brief Convert attribute bits to text
+ std::string getAsString() const;
+};
+
+//===----------------------------------------------------------------------===//
+/// AttrBuilder - This class is used in conjunction with the Attributes::get
+/// method to create an Attributes object. The object itself is uniquified. The
+/// Builder's value, however, is not. So this can be used as a quick way to test
+/// for equality, presence of attributes, etc.
+class AttrBuilder {
+ uint64_t Bits;
+public:
+ AttrBuilder() : Bits(0) {}
+ explicit AttrBuilder(uint64_t B) : Bits(B) {}
+ AttrBuilder(const Attributes &A) : Bits(A.Raw()) {}
+
+ void clear() { Bits = 0; }
+
+ /// addAttribute - Add an attribute to the builder.
+ AttrBuilder &addAttribute(Attributes::AttrVal Val);
+
+ /// removeAttribute - Remove an attribute from the builder.
+ AttrBuilder &removeAttribute(Attributes::AttrVal Val);
+
+ /// addAttribute - Add the attributes from A to the builder.
+ AttrBuilder &addAttributes(const Attributes &A);
+
+ /// removeAttribute - Remove the attributes from A from the builder.
+ AttrBuilder &removeAttributes(const Attributes &A);
+
+ /// hasAttribute - Return true if the builder has the specified attribute.
+ bool hasAttribute(Attributes::AttrVal A) const;
+
+ /// hasAttributes - Return true if the builder has IR-level attributes.
+ bool hasAttributes() const;
+
+ /// hasAttributes - Return true if the builder has any attribute that's in the
+ /// specified attribute.
+ bool hasAttributes(const Attributes &A) const;
+
+ /// hasAlignmentAttr - Return true if the builder has an alignment attribute.
+ bool hasAlignmentAttr() const;
+
+ /// getAlignment - Retrieve the alignment attribute, if it exists.
+ uint64_t getAlignment() const;
+
+ /// getStackAlignment - Retrieve the stack alignment attribute, if it exists.
+ uint64_t getStackAlignment() const;
+
+ /// addAlignmentAttr - This turns an int alignment (which must be a power of
+ /// 2) into the form used internally in Attributes.
+ AttrBuilder &addAlignmentAttr(unsigned Align);
+
+ /// addStackAlignmentAttr - This turns an int stack alignment (which must be a
+ /// power of 2) into the form used internally in Attributes.
+ AttrBuilder &addStackAlignmentAttr(unsigned Align);
+
+ /// addRawValue - Add the raw value to the internal representation.
+ /// N.B. This should be used ONLY for decoding LLVM bitcode!
+ AttrBuilder &addRawValue(uint64_t Val);
+
+ /// @brief Remove attributes that are used on functions only.
+ void removeFunctionOnlyAttrs() {
+ removeAttribute(Attributes::NoReturn)
+ .removeAttribute(Attributes::NoUnwind)
+ .removeAttribute(Attributes::ReadNone)
+ .removeAttribute(Attributes::ReadOnly)
+ .removeAttribute(Attributes::NoInline)
+ .removeAttribute(Attributes::AlwaysInline)
+ .removeAttribute(Attributes::OptimizeForSize)
+ .removeAttribute(Attributes::StackProtect)
+ .removeAttribute(Attributes::StackProtectReq)
+ .removeAttribute(Attributes::NoRedZone)
+ .removeAttribute(Attributes::NoImplicitFloat)
+ .removeAttribute(Attributes::Naked)
+ .removeAttribute(Attributes::InlineHint)
+ .removeAttribute(Attributes::StackAlignment)
+ .removeAttribute(Attributes::UWTable)
+ .removeAttribute(Attributes::NonLazyBind)
+ .removeAttribute(Attributes::ReturnsTwice)
+ .removeAttribute(Attributes::AddressSafety)
+ .removeAttribute(Attributes::MinSize);
+ }
+ uint64_t Raw() const { return Bits; }
+
+ bool operator==(const AttrBuilder &B) {
+ return Bits == B.Bits;
+ }
+ bool operator!=(const AttrBuilder &B) {
+ return Bits != B.Bits;
+ }
+};
+
+//===----------------------------------------------------------------------===//
+// AttributeWithIndex
+//===----------------------------------------------------------------------===//
+
+/// AttributeWithIndex - This is just a pair of values to associate a set of
+/// attributes 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(LLVMContext &C, unsigned Idx,
+ ArrayRef<Attributes::AttrVal> Attrs) {
+ return get(Idx, Attributes::get(C, Attrs));
+ }
static AttributeWithIndex get(unsigned Idx, Attributes Attrs) {
AttributeWithIndex P;
P.Index = Idx;
};
//===----------------------------------------------------------------------===//
-// AttrListPtr Smart Pointer
+// AttributeSet Smart Pointer
//===----------------------------------------------------------------------===//
class AttributeListImpl;
-/// AttrListPtr - This class manages the ref count for the opaque
+/// AttributeSet - 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
- /// to represent the empty attributes list.
+class AttributeSet {
+public:
+ enum AttrIndex {
+ ReturnIndex = 0U,
+ FunctionIndex = ~0U
+ };
+private:
+ /// @brief The attributes that we are managing. This can be null to represent
+ /// the empty attributes list.
AttributeListImpl *AttrList;
+
+ /// @brief The attributes for the specified index are returned. Attributes
+ /// for the result are denoted with Idx = 0.
+ Attributes getAttributes(unsigned Idx) const;
+
+ explicit AttributeSet(AttributeListImpl *LI) : AttrList(LI) {}
public:
- AttrListPtr() : AttrList(0) {}
- AttrListPtr(const AttrListPtr &P);
- const AttrListPtr &operator=(const AttrListPtr &RHS);
- ~AttrListPtr();
+ AttributeSet() : AttrList(0) {}
+ AttributeSet(const AttributeSet &P) : AttrList(P.AttrList) {}
+ const AttributeSet &operator=(const AttributeSet &RHS);
//===--------------------------------------------------------------------===//
// 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>
- static AttrListPtr get(const Iter &I, const Iter &E) {
- if (I == E) return AttrListPtr(); // Empty list.
- return get(&*I, static_cast<unsigned>(E-I));
- }
+ /// get - Return a Attributes list with the specified parameters in it.
+ static AttributeSet get(LLVMContext &C, ArrayRef<AttributeWithIndex> Attrs);
/// addAttr - Add the specified attribute at the specified index to this
/// attribute list. Since attribute lists are immutable, this
/// returns the new list.
- AttrListPtr addAttr(unsigned Idx, Attributes Attrs) const;
+ AttributeSet addAttr(LLVMContext &C, 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;
+ AttributeSet removeAttr(LLVMContext &C, unsigned Idx, Attributes Attrs) const;
//===--------------------------------------------------------------------===//
// Attribute List Accessors
/// getParamAttributes - The attributes for the specified index are
/// 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.
Attributes getRetAttributes() const {
- return getAttributes(0);
+ return getAttributes(ReturnIndex);
}
/// getFnAttributes - The function attributes are returned.
Attributes getFnAttributes() const {
- return getAttributes(~0U);
+ return getAttributes(FunctionIndex);
}
/// 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).hasAttributes(Attr);
}
/// getParamAlignment - Return the alignment for the specified function
/// parameter.
unsigned getParamAlignment(unsigned Idx) const {
- return Attribute::getAlignmentFromAttrs(getAttributes(Idx));
+ return getAttributes(Idx).getAlignment();
}
/// hasAttrSomewhere - Return true if the specified attribute is set for at
/// least one parameter or for the return value.
- bool hasAttrSomewhere(Attributes Attr) const;
+ bool hasAttrSomewhere(Attributes::AttrVal Attr) const;
+
+ unsigned getNumAttrs() const;
+ Attributes &getAttributesAtIndex(unsigned i) const;
/// operator==/!= - Provide equality predicates.
- bool operator==(const AttrListPtr &RHS) const
+ bool operator==(const AttributeSet &RHS) const
{ return AttrList == RHS.AttrList; }
- bool operator!=(const AttrListPtr &RHS) const
+ bool operator!=(const AttributeSet &RHS) const
{ return AttrList != RHS.AttrList; }
- void dump() const;
-
//===--------------------------------------------------------------------===//
// Attribute List Introspection
//===--------------------------------------------------------------------===//
/// holds a index number plus a set of attributes.
const AttributeWithIndex &getSlot(unsigned Slot) const;
-private:
- explicit AttrListPtr(AttributeListImpl *L);
-
- /// getAttributes - The attributes for the specified index are
- /// returned. Attributes for the result are denoted with Idx = 0.
- Attributes getAttributes(unsigned Idx) const;
-
+ void dump() const;
};
} // End llvm namespace
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