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b29ce26ea6
This emits the attribute groups that are used by the functions. (It currently doesn't print out return type or parameter attributes within attribute groups.) Note: The functions still retrieve their attributes from the "old" bitcode format (using the deprecated 'Raw()' method). This means that string attributes within an attribute group will not show up during a disassembly. This will be addressed in a future commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174867 91177308-0d34-0410-b5e6-96231b3b80d8
539 lines
21 KiB
C++
539 lines
21 KiB
C++
//===-- llvm/Attributes.h - Container for Attributes ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file contains the simple types necessary to represent the
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/// attributes associated with functions and their calls.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_ATTRIBUTES_H
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#define LLVM_IR_ATTRIBUTES_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/FoldingSet.h"
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#include <cassert>
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#include <map>
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#include <string>
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namespace llvm {
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class AttrBuilder;
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class AttributeImpl;
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class AttributeSetImpl;
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class AttributeSetNode;
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class Constant;
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class LLVMContext;
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class Type;
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief Functions, function parameters, and return types can have attributes
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/// to indicate how they should be treated by optimizations and code
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/// generation. This class represents one of those attributes. It's light-weight
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/// and should be passed around by-value.
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class Attribute {
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public:
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/// This enumeration lists the attributes that can be associated with
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/// parameters, function results, or the function itself.
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///
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/// Note: The `uwtable' attribute is about the ABI or the user mandating an
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/// entry in the unwind table. The `nounwind' attribute is about an exception
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/// passing by the function.
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///
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/// In a theoretical system that uses tables for profiling and SjLj for
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/// exceptions, they would be fully independent. In a normal system that uses
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/// tables for both, the semantics are:
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///
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/// nil = Needs an entry because an exception might pass by.
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/// nounwind = No need for an entry
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/// uwtable = Needs an entry because the ABI says so and because
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/// an exception might pass by.
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/// uwtable + nounwind = Needs an entry because the ABI says so.
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enum AttrKind {
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// IR-Level Attributes
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None, ///< No attributes have been set
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AddressSafety, ///< Address safety checking is on.
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Alignment, ///< Alignment of parameter (5 bits)
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///< stored as log2 of alignment with +1 bias
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///< 0 means unaligned (different from align(1))
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AlwaysInline, ///< inline=always
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ByVal, ///< Pass structure by value
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InlineHint, ///< Source said inlining was desirable
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InReg, ///< Force argument to be passed in register
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MinSize, ///< Function must be optimized for size first
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Naked, ///< Naked function
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Nest, ///< Nested function static chain
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NoAlias, ///< Considered to not alias after call
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NoCapture, ///< Function creates no aliases of pointer
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NoDuplicate, ///< Call cannot be duplicated
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NoImplicitFloat, ///< Disable implicit floating point insts
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NoInline, ///< inline=never
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NonLazyBind, ///< Function is called early and/or
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///< often, so lazy binding isn't worthwhile
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NoRedZone, ///< Disable redzone
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NoReturn, ///< Mark the function as not returning
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NoUnwind, ///< Function doesn't unwind stack
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OptimizeForSize, ///< opt_size
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ReadNone, ///< Function does not access memory
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ReadOnly, ///< Function only reads from memory
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ReturnsTwice, ///< Function can return twice
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SExt, ///< Sign extended before/after call
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StackAlignment, ///< Alignment of stack for function (3 bits)
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///< stored as log2 of alignment with +1 bias 0
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///< means unaligned (different from
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///< alignstack=(1))
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StackProtect, ///< Stack protection.
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StackProtectReq, ///< Stack protection required.
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StackProtectStrong, ///< Strong Stack protection.
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StructRet, ///< Hidden pointer to structure to return
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ThreadSafety, ///< Thread safety checking is on.
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UninitializedChecks, ///< Checking for uses of uninitialized memory is on.
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UWTable, ///< Function must be in a unwind table
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ZExt, ///< Zero extended before/after call
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EndAttrKinds, ///< Sentinal value useful for loops
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AttrKindEmptyKey, ///< Empty key value for DenseMapInfo
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AttrKindTombstoneKey ///< Tombstone key value for DenseMapInfo
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};
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private:
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AttributeImpl *pImpl;
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Attribute(AttributeImpl *A) : pImpl(A) {}
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public:
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Attribute() : pImpl(0) {}
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//===--------------------------------------------------------------------===//
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// Attribute Construction
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//===--------------------------------------------------------------------===//
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/// \brief Return a uniquified Attribute object.
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static Attribute get(LLVMContext &Context, AttrKind Kind, uint64_t Val = 0);
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static Attribute get(LLVMContext &Context, StringRef Kind,
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StringRef Val = StringRef());
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/// \brief Return a uniquified Attribute object that has the specific
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/// alignment set.
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static Attribute getWithAlignment(LLVMContext &Context, uint64_t Align);
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static Attribute getWithStackAlignment(LLVMContext &Context, uint64_t Align);
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//===--------------------------------------------------------------------===//
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// Attribute Accessors
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//===--------------------------------------------------------------------===//
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/// \brief Return true if the attribute is an Attribute::AttrKind type.
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bool isEnumAttribute() const;
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/// \brief Return true if the attribute is an alignment attribute.
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bool isAlignAttribute() const;
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/// \brief Return true if the attribute is a string (target-dependent)
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/// attribute.
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bool isStringAttribute() const;
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/// \brief Return true if the attribute is present.
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bool hasAttribute(AttrKind Val) const;
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/// \brief Return true if the target-dependent attribute is present.
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bool hasAttribute(StringRef Val) const;
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/// \brief Return the attribute's kind as an enum (Attribute::AttrKind). This
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/// requires the attribute to be an enum or alignment attribute.
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Attribute::AttrKind getKindAsEnum() const;
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/// \brief Return the attribute's value as an integer. This requires that the
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/// attribute be an alignment attribute.
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uint64_t getValueAsInt() const;
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/// \brief Return the attribute's kind as a string. This requires the
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/// attribute to be a string attribute.
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StringRef getKindAsString() const;
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/// \brief Return the attribute's value as a string. This requires the
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/// attribute to be a string attribute.
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StringRef getValueAsString() const;
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/// \brief Returns the alignment field of an attribute as a byte alignment
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/// value.
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unsigned getAlignment() const;
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/// \brief Returns the stack alignment field of an attribute as a byte
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/// alignment value.
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unsigned getStackAlignment() const;
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/// \brief The Attribute is converted to a string of equivalent mnemonic. This
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/// is, presumably, for writing out the mnemonics for the assembly writer.
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std::string getAsString(bool InAttrGrp = false) const;
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/// \brief Equality and non-equality operators.
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bool operator==(Attribute A) const { return pImpl == A.pImpl; }
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bool operator!=(Attribute A) const { return pImpl != A.pImpl; }
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/// \brief Less-than operator. Useful for sorting the attributes list.
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bool operator<(Attribute A) const;
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void Profile(FoldingSetNodeID &ID) const {
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ID.AddPointer(pImpl);
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}
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief Provide DenseMapInfo for Attribute::AttrKinds. This is used by
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/// AttrBuilder.
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template<> struct DenseMapInfo<Attribute::AttrKind> {
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static inline Attribute::AttrKind getEmptyKey() {
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return Attribute::AttrKindEmptyKey;
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}
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static inline Attribute::AttrKind getTombstoneKey() {
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return Attribute::AttrKindTombstoneKey;
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}
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static unsigned getHashValue(const Attribute::AttrKind &Val) {
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return Val * 37U;
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}
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static bool isEqual(const Attribute::AttrKind &LHS,
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const Attribute::AttrKind &RHS) {
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return LHS == RHS;
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}
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class holds the attributes for a function, its return value, and
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/// its parameters. You access the attributes for each of them via an index into
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/// the AttributeSet object. The function attributes are at index
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/// `AttributeSet::FunctionIndex', the return value is at index
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/// `AttributeSet::ReturnIndex', and the attributes for the parameters start at
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/// index `1'.
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class AttributeSet {
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public:
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enum AttrIndex {
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ReturnIndex = 0U,
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FunctionIndex = ~0U
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};
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private:
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friend class AttrBuilder;
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friend class AttributeSetImpl;
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template <typename Ty> friend struct DenseMapInfo;
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/// \brief The attributes that we are managing. This can be null to represent
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/// the empty attributes list.
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AttributeSetImpl *pImpl;
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/// \brief The attributes for the specified index are returned.
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AttributeSetNode *getAttributes(unsigned Idx) const;
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/// \brief Create an AttributeSet with the specified parameters in it.
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static AttributeSet get(LLVMContext &C,
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ArrayRef<std::pair<unsigned, Attribute> > Attrs);
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static AttributeSet get(LLVMContext &C,
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ArrayRef<std::pair<unsigned,
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AttributeSetNode*> > Attrs);
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static AttributeSet getImpl(LLVMContext &C,
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ArrayRef<std::pair<unsigned,
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AttributeSetNode*> > Attrs);
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explicit AttributeSet(AttributeSetImpl *LI) : pImpl(LI) {}
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public:
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AttributeSet() : pImpl(0) {}
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AttributeSet(const AttributeSet &P) : pImpl(P.pImpl) {}
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const AttributeSet &operator=(const AttributeSet &RHS) {
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pImpl = RHS.pImpl;
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return *this;
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}
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//===--------------------------------------------------------------------===//
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// AttributeSet Construction and Mutation
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//===--------------------------------------------------------------------===//
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/// \brief Return an AttributeSet with the specified parameters in it.
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static AttributeSet get(LLVMContext &C, ArrayRef<AttributeSet> Attrs);
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static AttributeSet get(LLVMContext &C, unsigned Idx,
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ArrayRef<Attribute::AttrKind> Kind);
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static AttributeSet get(LLVMContext &C, unsigned Idx, AttrBuilder &B);
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/// \brief Add an attribute to the attribute set at the given index. Since
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/// attribute sets are immutable, this returns a new set.
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AttributeSet addAttribute(LLVMContext &C, unsigned Idx,
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Attribute::AttrKind Attr) const;
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/// \brief Add attributes to the attribute set at the given index. Since
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/// attribute sets are immutable, this returns a new set.
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AttributeSet addAttributes(LLVMContext &C, unsigned Idx,
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AttributeSet Attrs) const;
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/// \brief Remove the specified attribute at the specified index from this
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/// attribute list. Since attribute lists are immutable, this returns the new
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/// list.
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AttributeSet removeAttribute(LLVMContext &C, unsigned Idx,
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Attribute::AttrKind Attr) const;
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/// \brief Remove the specified attributes at the specified index from this
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/// attribute list. Since attribute lists are immutable, this returns the new
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/// list.
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AttributeSet removeAttributes(LLVMContext &C, unsigned Idx,
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AttributeSet Attrs) const;
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//===--------------------------------------------------------------------===//
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// AttributeSet Accessors
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//===--------------------------------------------------------------------===//
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/// \brief Retrieve the LLVM context.
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LLVMContext &getContext() const;
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/// \brief The attributes for the specified index are returned.
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AttributeSet getParamAttributes(unsigned Idx) const;
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/// \brief The attributes for the ret value are returned.
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AttributeSet getRetAttributes() const;
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/// \brief The function attributes are returned.
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AttributeSet getFnAttributes() const;
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/// \brief Return true if the attribute exists at the given index.
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bool hasAttribute(unsigned Index, Attribute::AttrKind Kind) const;
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/// \brief Return true if attribute exists at the given index.
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bool hasAttributes(unsigned Index) const;
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/// \brief Return true if the specified attribute is set for at least one
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/// parameter or for the return value.
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bool hasAttrSomewhere(Attribute::AttrKind Attr) const;
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/// \brief Return the alignment for the specified function parameter.
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unsigned getParamAlignment(unsigned Idx) const;
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/// \brief Get the stack alignment.
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unsigned getStackAlignment(unsigned Index) const;
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/// \brief Return the attributes at the index as a string.
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std::string getAsString(unsigned Index, bool InAttrGrp = false) const;
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typedef ArrayRef<Attribute>::iterator iterator;
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iterator begin(unsigned Idx) const;
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iterator end(unsigned Idx) const;
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/// operator==/!= - Provide equality predicates.
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bool operator==(const AttributeSet &RHS) const {
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return pImpl == RHS.pImpl;
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}
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bool operator!=(const AttributeSet &RHS) const {
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return pImpl != RHS.pImpl;
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}
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//===--------------------------------------------------------------------===//
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// AttributeSet Introspection
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//===--------------------------------------------------------------------===//
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// FIXME: Remove this.
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uint64_t Raw(unsigned Index) const;
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/// \brief Return a raw pointer that uniquely identifies this attribute list.
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void *getRawPointer() const {
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return pImpl;
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}
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/// \brief Return true if there are no attributes.
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bool isEmpty() const {
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return getNumSlots() == 0;
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}
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/// \brief Return the number of slots used in this attribute list. This is
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/// the number of arguments that have an attribute set on them (including the
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/// function itself).
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unsigned getNumSlots() const;
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/// \brief Return the index for the given slot.
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uint64_t getSlotIndex(unsigned Slot) const;
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/// \brief Return the attributes at the given slot.
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AttributeSet getSlotAttributes(unsigned Slot) const;
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void dump() const;
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief Provide DenseMapInfo for AttributeSet.
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template<> struct DenseMapInfo<AttributeSet> {
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static inline AttributeSet getEmptyKey() {
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uintptr_t Val = static_cast<uintptr_t>(-1);
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Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
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return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
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}
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static inline AttributeSet getTombstoneKey() {
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uintptr_t Val = static_cast<uintptr_t>(-2);
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Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
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return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
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}
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static unsigned getHashValue(AttributeSet AS) {
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return (unsigned((uintptr_t)AS.pImpl) >> 4) ^
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(unsigned((uintptr_t)AS.pImpl) >> 9);
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}
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static bool isEqual(AttributeSet LHS, AttributeSet RHS) { return LHS == RHS; }
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class is used in conjunction with the Attribute::get method to
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/// create an Attribute object. The object itself is uniquified. The Builder's
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/// value, however, is not. So this can be used as a quick way to test for
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/// equality, presence of attributes, etc.
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class AttrBuilder {
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DenseSet<Attribute::AttrKind> Attrs;
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std::map<std::string, std::string> TargetDepAttrs;
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uint64_t Alignment;
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uint64_t StackAlignment;
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public:
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AttrBuilder() : Alignment(0), StackAlignment(0) {}
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explicit AttrBuilder(uint64_t Val) : Alignment(0), StackAlignment(0) {
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addRawValue(Val);
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}
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AttrBuilder(const Attribute &A) : Alignment(0), StackAlignment(0) {
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addAttribute(A);
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}
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AttrBuilder(AttributeSet AS, unsigned Idx);
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AttrBuilder(const AttrBuilder &B)
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: Attrs(B.Attrs),
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TargetDepAttrs(B.TargetDepAttrs.begin(), B.TargetDepAttrs.end()),
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Alignment(B.Alignment), StackAlignment(B.StackAlignment) {}
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void clear();
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/// \brief Add an attribute to the builder.
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AttrBuilder &addAttribute(Attribute::AttrKind Val);
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/// \brief Add the Attribute object to the builder.
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AttrBuilder &addAttribute(Attribute A);
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/// \brief Add the target-dependent attribute to the builder.
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AttrBuilder &addAttribute(StringRef A, StringRef V);
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/// \brief Remove an attribute from the builder.
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AttrBuilder &removeAttribute(Attribute::AttrKind Val);
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/// \brief Remove the attributes from the builder.
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AttrBuilder &removeAttributes(AttributeSet A, uint64_t Index);
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/// \brief Remove the target-dependent attribute to the builder.
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AttrBuilder &removeAttribute(StringRef A);
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/// \brief Add the attributes from the builder.
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AttrBuilder &merge(const AttrBuilder &B);
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/// \brief Return true if the builder has the specified attribute.
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bool contains(Attribute::AttrKind A) const;
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/// \brief Return true if the builder has the specified target-dependent
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/// attribute.
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bool contains(StringRef A) const;
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/// \brief Return true if the builder has IR-level attributes.
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bool hasAttributes() const;
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/// \brief Return true if the builder has any attribute that's in the
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/// specified attribute.
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bool hasAttributes(AttributeSet A, uint64_t Index) const;
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/// \brief Return true if the builder has an alignment attribute.
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bool hasAlignmentAttr() const;
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/// \brief Retrieve the alignment attribute, if it exists.
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uint64_t getAlignment() const { return Alignment; }
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/// \brief Retrieve the stack alignment attribute, if it exists.
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uint64_t getStackAlignment() const { return StackAlignment; }
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/// \brief This turns an int alignment (which must be a power of 2) into the
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/// form used internally in Attribute.
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AttrBuilder &addAlignmentAttr(unsigned Align);
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/// \brief This turns an int stack alignment (which must be a power of 2) into
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/// the form used internally in Attribute.
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AttrBuilder &addStackAlignmentAttr(unsigned Align);
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// Iterators for target-independent attributes.
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typedef DenseSet<Attribute::AttrKind>::iterator iterator;
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typedef DenseSet<Attribute::AttrKind>::const_iterator const_iterator;
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iterator begin() { return Attrs.begin(); }
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iterator end() { return Attrs.end(); }
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const_iterator begin() const { return Attrs.begin(); }
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const_iterator end() const { return Attrs.end(); }
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bool empty() const { return Attrs.empty(); }
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// Iterators for target-dependent attributes.
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typedef std::pair<std::string, std::string> td_type;
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typedef std::map<std::string, std::string>::iterator td_iterator;
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typedef std::map<std::string, std::string>::const_iterator td_const_iterator;
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td_iterator td_begin() { return TargetDepAttrs.begin(); }
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td_iterator td_end() { return TargetDepAttrs.end(); }
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td_const_iterator td_begin() const { return TargetDepAttrs.begin(); }
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td_const_iterator td_end() const { return TargetDepAttrs.end(); }
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bool td_empty() const { return TargetDepAttrs.empty(); }
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/// \brief Remove attributes that are used on functions only.
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void removeFunctionOnlyAttrs() {
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removeAttribute(Attribute::NoReturn)
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.removeAttribute(Attribute::NoUnwind)
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.removeAttribute(Attribute::ReadNone)
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.removeAttribute(Attribute::ReadOnly)
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.removeAttribute(Attribute::NoInline)
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.removeAttribute(Attribute::AlwaysInline)
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.removeAttribute(Attribute::OptimizeForSize)
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.removeAttribute(Attribute::StackProtect)
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.removeAttribute(Attribute::StackProtectReq)
|
|
.removeAttribute(Attribute::StackProtectStrong)
|
|
.removeAttribute(Attribute::NoRedZone)
|
|
.removeAttribute(Attribute::NoImplicitFloat)
|
|
.removeAttribute(Attribute::Naked)
|
|
.removeAttribute(Attribute::InlineHint)
|
|
.removeAttribute(Attribute::StackAlignment)
|
|
.removeAttribute(Attribute::UWTable)
|
|
.removeAttribute(Attribute::NonLazyBind)
|
|
.removeAttribute(Attribute::ReturnsTwice)
|
|
.removeAttribute(Attribute::AddressSafety)
|
|
.removeAttribute(Attribute::ThreadSafety)
|
|
.removeAttribute(Attribute::UninitializedChecks)
|
|
.removeAttribute(Attribute::MinSize)
|
|
.removeAttribute(Attribute::NoDuplicate);
|
|
}
|
|
|
|
bool operator==(const AttrBuilder &B);
|
|
bool operator!=(const AttrBuilder &B) {
|
|
return !(*this == B);
|
|
}
|
|
|
|
// FIXME: Remove this in 4.0.
|
|
|
|
/// \brief Add the raw value to the internal representation.
|
|
AttrBuilder &addRawValue(uint64_t Val);
|
|
};
|
|
|
|
namespace AttributeFuncs {
|
|
|
|
/// \brief Which attributes cannot be applied to a type.
|
|
AttributeSet typeIncompatible(Type *Ty, uint64_t Index);
|
|
|
|
} // end AttributeFuncs namespace
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|