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400 lines
15 KiB
C++
400 lines
15 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_ATTRIBUTES_H
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#define LLVM_ATTRIBUTES_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/MathExtras.h"
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#include <cassert>
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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 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: uwtable is about the ABI or the user mandating an entry in the
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/// unwind table. The nounwind attribute is about an exception passing by the
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/// 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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StructRet, ///< Hidden pointer to structure to return
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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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};
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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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/// \brief Return a uniquified Attribute object. This takes the uniquified
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/// value from the Builder and wraps it in the Attribute class.
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static Attribute get(LLVMContext &Context, ArrayRef<AttrKind> Vals);
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static Attribute get(LLVMContext &Context, AttrBuilder &B);
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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 attributes exist
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bool hasAttributes() const;
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/// \brief Return true if the attributes are a non-null intersection.
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bool hasAttributes(const Attribute &A) 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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bool operator==(AttrKind K) const;
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bool operator!=(AttrKind K) const;
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// FIXME: Remove these 'operator' methods.
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bool operator==(const Attribute &A) const {
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return pImpl == A.pImpl;
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}
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bool operator!=(const Attribute &A) const {
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return pImpl != A.pImpl;
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}
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uint64_t getBitMask() const;
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/// \brief Which attributes cannot be applied to a type.
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static Attribute typeIncompatible(Type *Ty);
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/// \brief This returns an integer containing an encoding of all the LLVM
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/// attributes found in the given attribute bitset. Any change to this
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/// encoding is a breaking change to bitcode compatibility.
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static uint64_t encodeLLVMAttributesForBitcode(Attribute Attrs);
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/// \brief This returns an attribute bitset containing the LLVM attributes
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/// that have been decoded from the given integer. This function must stay in
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/// sync with 'encodeLLVMAttributesForBitcode'.
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static Attribute decodeLLVMAttributesForBitcode(LLVMContext &C,
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uint64_t EncodedAttrs);
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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() const;
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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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uint64_t Bits;
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public:
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AttrBuilder() : Bits(0) {}
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explicit AttrBuilder(uint64_t B) : Bits(B) {}
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AttrBuilder(const Attribute &A) : Bits(A.getBitMask()) {}
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void clear() { Bits = 0; }
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/// addAttribute - Add an attribute to the builder.
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AttrBuilder &addAttribute(Attribute::AttrKind Val);
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/// removeAttribute - Remove an attribute from the builder.
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AttrBuilder &removeAttribute(Attribute::AttrKind Val);
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/// addAttribute - Add the attributes from A to the builder.
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AttrBuilder &addAttributes(const Attribute &A);
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/// removeAttribute - Remove the attributes from A from the builder.
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AttrBuilder &removeAttributes(const Attribute &A);
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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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/// hasAttributes - Return true if the builder has IR-level attributes.
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bool hasAttributes() const;
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/// hasAttributes - Return true if the builder has any attribute that's in the
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/// specified attribute.
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bool hasAttributes(const Attribute &A) const;
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/// hasAlignmentAttr - Return true if the builder has an alignment attribute.
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bool hasAlignmentAttr() const;
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/// getAlignment - Retrieve the alignment attribute, if it exists.
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uint64_t getAlignment() const;
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/// getStackAlignment - Retrieve the stack alignment attribute, if it exists.
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uint64_t getStackAlignment() const;
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/// addAlignmentAttr - This turns an int alignment (which must be a power of
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/// 2) into the form used internally in Attribute.
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AttrBuilder &addAlignmentAttr(unsigned Align);
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/// addStackAlignmentAttr - This turns an int stack alignment (which must be a
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/// power of 2) into the form used internally in Attribute.
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AttrBuilder &addStackAlignmentAttr(unsigned Align);
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/// addRawValue - Add the raw value to the internal representation.
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/// N.B. This should be used ONLY for decoding LLVM bitcode!
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AttrBuilder &addRawValue(uint64_t Val);
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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)
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.removeAttribute(Attribute::NoRedZone)
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.removeAttribute(Attribute::NoImplicitFloat)
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.removeAttribute(Attribute::Naked)
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.removeAttribute(Attribute::InlineHint)
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.removeAttribute(Attribute::StackAlignment)
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.removeAttribute(Attribute::UWTable)
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.removeAttribute(Attribute::NonLazyBind)
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.removeAttribute(Attribute::ReturnsTwice)
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.removeAttribute(Attribute::AddressSafety)
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.removeAttribute(Attribute::MinSize)
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.removeAttribute(Attribute::NoDuplicate);
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}
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uint64_t getBitMask() const { return Bits; }
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bool operator==(const AttrBuilder &B) {
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return Bits == B.Bits;
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}
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bool operator!=(const AttrBuilder &B) {
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return Bits != B.Bits;
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}
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This is just a pair of values to associate a set of attributes with
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/// an index.
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struct AttributeWithIndex {
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Attribute Attrs; ///< The attributes that are set, or'd together.
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unsigned Index; ///< Index of the parameter for which the attributes apply.
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///< Index 0 is used for return value attributes.
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///< Index ~0U is used for function attributes.
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static AttributeWithIndex get(LLVMContext &C, unsigned Idx,
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ArrayRef<Attribute::AttrKind> Attrs) {
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return get(Idx, Attribute::get(C, Attrs));
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}
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static AttributeWithIndex get(unsigned Idx, Attribute Attrs) {
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AttributeWithIndex P;
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P.Index = Idx;
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P.Attrs = Attrs;
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return P;
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}
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};
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//===----------------------------------------------------------------------===//
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// AttributeSet Smart Pointer
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//===----------------------------------------------------------------------===//
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class AttributeSetImpl;
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class manages the ref count for the opaque AttributeSetImpl
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/// object and provides accessors for it.
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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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/// \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 *AttrList;
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/// \brief The attributes for the specified index are returned. Attributes
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/// for the result are denoted with Idx = 0.
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Attribute getAttributes(unsigned Idx) const;
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explicit AttributeSet(AttributeSetImpl *LI) : AttrList(LI) {}
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public:
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AttributeSet() : AttrList(0) {}
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AttributeSet(const AttributeSet &P) : AttrList(P.AttrList) {}
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const AttributeSet &operator=(const AttributeSet &RHS);
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//===--------------------------------------------------------------------===//
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// Attribute List 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<AttributeWithIndex> Attrs);
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/// \brief Add the specified attribute at the specified index to 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 addAttr(LLVMContext &C, unsigned Idx, Attribute 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 removeAttr(LLVMContext &C, unsigned Idx, Attribute Attrs) const;
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//===--------------------------------------------------------------------===//
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// Attribute Set Accessors
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//===--------------------------------------------------------------------===//
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/// \brief The attributes for the specified index are returned.
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Attribute getParamAttributes(unsigned Idx) const {
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return getAttributes(Idx);
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}
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/// \brief The attributes for the ret value are returned.
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Attribute getRetAttributes() const {
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return getAttributes(ReturnIndex);
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}
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/// \brief The function attributes are returned.
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Attribute getFnAttributes() const {
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return getAttributes(FunctionIndex);
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}
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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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return getAttributes(Idx).getAlignment();
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}
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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 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) const;
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uint64_t getBitMask(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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/// operator==/!= - Provide equality predicates.
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bool operator==(const AttributeSet &RHS) const {
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return AttrList == RHS.AttrList;
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}
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bool operator!=(const AttributeSet &RHS) const {
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return AttrList != RHS.AttrList;
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}
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//===--------------------------------------------------------------------===//
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// Attribute Set Introspection
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//===--------------------------------------------------------------------===//
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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 AttrList;
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}
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// Attributes are stored as a dense set of slots, where there is one slot for
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// each argument that has an attribute. This allows walking over the dense
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// set instead of walking the sparse list of attributes.
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/// \brief Return true if there are no attributes.
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bool isEmpty() const {
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return AttrList == 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 AttributeWithIndex at the specified slot. This holds a
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/// index number plus a set of attributes.
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const AttributeWithIndex &getSlot(unsigned Slot) const;
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void dump() const;
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};
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} // end llvm namespace
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#endif
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