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507 lines
20 KiB
507 lines
20 KiB
//===-- 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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// 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/AttributesImpl.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/ADT/ArrayRef.h"
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#include <cassert>
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#include <string>
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namespace llvm {
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class LLVMContext;
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class Type;
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namespace Attribute {
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/// AttrConst - We use this proxy POD type to allow constructing Attributes
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/// constants using initializer lists. Do not use this class directly.
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struct AttrConst {
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uint64_t v;
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AttrConst operator | (const AttrConst Attrs) const {
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AttrConst Res = {v | Attrs.v};
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return Res;
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}
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AttrConst operator ~ () const {
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AttrConst Res = {~v};
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return Res;
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}
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};
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/// Function parameters and results can have attributes to indicate how they
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/// should be treated by optimizations and code generation. This enumeration
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/// lists the attributes that can be associated with parameters, function
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/// results or the function itself.
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/// @brief Function attributes.
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/// We declare AttrConst objects that will be used throughout the code and also
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/// raw uint64_t objects with _i suffix to be used below for other constant
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/// declarations. This is done to avoid static CTORs and at the same time to
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/// keep type-safety of Attributes.
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#define DECLARE_LLVM_ATTRIBUTE(name, value) \
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const AttrConst name = {value};
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DECLARE_LLVM_ATTRIBUTE(None,0) ///< No attributes have been set
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DECLARE_LLVM_ATTRIBUTE(ZExt,1<<0) ///< Zero extended before/after call
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DECLARE_LLVM_ATTRIBUTE(SExt,1<<1) ///< Sign extended before/after call
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DECLARE_LLVM_ATTRIBUTE(NoReturn,1<<2) ///< Mark the function as not returning
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DECLARE_LLVM_ATTRIBUTE(InReg,1<<3) ///< Force argument to be passed in register
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DECLARE_LLVM_ATTRIBUTE(StructRet,1<<4) ///< Hidden pointer to structure to return
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DECLARE_LLVM_ATTRIBUTE(NoUnwind,1<<5) ///< Function doesn't unwind stack
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DECLARE_LLVM_ATTRIBUTE(NoAlias,1<<6) ///< Considered to not alias after call
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DECLARE_LLVM_ATTRIBUTE(ByVal,1<<7) ///< Pass structure by value
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DECLARE_LLVM_ATTRIBUTE(Nest,1<<8) ///< Nested function static chain
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DECLARE_LLVM_ATTRIBUTE(ReadNone,1<<9) ///< Function does not access memory
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DECLARE_LLVM_ATTRIBUTE(ReadOnly,1<<10) ///< Function only reads from memory
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DECLARE_LLVM_ATTRIBUTE(NoInline,1<<11) ///< inline=never
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DECLARE_LLVM_ATTRIBUTE(AlwaysInline,1<<12) ///< inline=always
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DECLARE_LLVM_ATTRIBUTE(OptimizeForSize,1<<13) ///< opt_size
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DECLARE_LLVM_ATTRIBUTE(StackProtect,1<<14) ///< Stack protection.
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DECLARE_LLVM_ATTRIBUTE(StackProtectReq,1<<15) ///< Stack protection required.
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DECLARE_LLVM_ATTRIBUTE(Alignment,31<<16) ///< 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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DECLARE_LLVM_ATTRIBUTE(NoCapture,1<<21) ///< Function creates no aliases of pointer
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DECLARE_LLVM_ATTRIBUTE(NoRedZone,1<<22) /// disable redzone
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DECLARE_LLVM_ATTRIBUTE(NoImplicitFloat,1<<23) /// disable implicit floating point
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/// instructions.
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DECLARE_LLVM_ATTRIBUTE(Naked,1<<24) ///< Naked function
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DECLARE_LLVM_ATTRIBUTE(InlineHint,1<<25) ///< source said inlining was
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///desirable
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DECLARE_LLVM_ATTRIBUTE(StackAlignment,7<<26) ///< Alignment of stack for
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///function (3 bits) stored as log2
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///of alignment with +1 bias
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///0 means unaligned (different from
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///alignstack= {1))
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DECLARE_LLVM_ATTRIBUTE(ReturnsTwice,1<<29) ///< Function can return twice
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DECLARE_LLVM_ATTRIBUTE(UWTable,1<<30) ///< Function must be in a unwind
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///table
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DECLARE_LLVM_ATTRIBUTE(NonLazyBind,1U<<31) ///< Function is called early and/or
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/// often, so lazy binding isn't
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/// worthwhile.
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DECLARE_LLVM_ATTRIBUTE(AddressSafety,1ULL<<32) ///< Address safety checking is on.
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#undef DECLARE_LLVM_ATTRIBUTE
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/// Note that 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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/// 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
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/// uses tables for both, the semantics are:
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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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} // namespace Attribute
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/// AttributeImpl - The internal representation of the Attributes class. This is
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/// uniquified.
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class AttributesImpl;
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/// Attributes - A bitset of attributes.
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class Attributes {
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public:
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enum AttrVal {
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None = 0, ///< No attributes have been set
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AddressSafety = 1, ///< Address safety checking is on.
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Alignment = 2, ///< 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 = 3, ///< inline=always
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ByVal = 4, ///< Pass structure by value
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InlineHint = 5, ///< Source said inlining was desirable
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InReg = 6, ///< Force argument to be passed in register
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Naked = 7, ///< Naked function
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Nest = 8, ///< Nested function static chain
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NoAlias = 9, ///< Considered to not alias after call
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NoCapture = 10, ///< Function creates no aliases of pointer
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NoImplicitFloat = 11, ///< Disable implicit floating point insts
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NoInline = 12, ///< inline=never
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NonLazyBind = 13, ///< Function is called early and/or
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///< often, so lazy binding isn't worthwhile
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NoRedZone = 14, ///< Disable redzone
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NoReturn = 15, ///< Mark the function as not returning
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NoUnwind = 16, ///< Function doesn't unwind stack
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OptimizeForSize = 17, ///< opt_size
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ReadNone = 18, ///< Function does not access memory
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ReadOnly = 19, ///< Function only reads from memory
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ReturnsTwice = 20, ///< Function can return twice
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SExt = 21, ///< Sign extended before/after call
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StackAlignment = 22, ///< 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 = 23, ///< Stack protection.
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StackProtectReq = 24, ///< Stack protection required.
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StructRet = 25, ///< Hidden pointer to structure to return
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UWTable = 26, ///< Function must be in a unwind table
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ZExt = 27 ///< Zero extended before/after call
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};
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private:
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AttributesImpl Attrs;
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explicit Attributes(AttributesImpl *A);
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public:
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Attributes() : Attrs(0) {}
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explicit Attributes(uint64_t Val);
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/*implicit*/ Attributes(Attribute::AttrConst Val);
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Attributes(const Attributes &A);
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class Builder {
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friend class Attributes;
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uint64_t Bits;
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public:
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Builder() : Bits(0) {}
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Builder(const Attributes &A) : Bits(A.Raw()) {}
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void clear() { Bits = 0; }
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bool hasAttributes() const;
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bool hasAttributes(const Attributes &A) const;
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bool hasAlignmentAttr() const;
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uint64_t getAlignment() const;
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Builder &addAttribute(Attributes::AttrVal Val);
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Builder &removeAttribute(Attributes::AttrVal Val);
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void addAlignmentAttr(unsigned Align);
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void addStackAlignmentAttr(unsigned Align);
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void removeAttributes(const Attributes &A);
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/// @brief Remove attributes that are used on functions only.
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void removeFunctionOnlyAttrs() {
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removeAttribute(Attributes::NoReturn)
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.removeAttribute(Attributes::NoUnwind)
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.removeAttribute(Attributes::ReadNone)
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.removeAttribute(Attributes::ReadOnly)
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.removeAttribute(Attributes::NoInline)
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.removeAttribute(Attributes::AlwaysInline)
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.removeAttribute(Attributes::OptimizeForSize)
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.removeAttribute(Attributes::StackProtect)
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.removeAttribute(Attributes::StackProtectReq)
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.removeAttribute(Attributes::NoRedZone)
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.removeAttribute(Attributes::NoImplicitFloat)
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.removeAttribute(Attributes::Naked)
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.removeAttribute(Attributes::InlineHint)
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.removeAttribute(Attributes::StackAlignment)
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.removeAttribute(Attributes::UWTable)
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.removeAttribute(Attributes::NonLazyBind)
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.removeAttribute(Attributes::ReturnsTwice)
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.removeAttribute(Attributes::AddressSafety);
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}
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};
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/// get - Return a uniquified Attributes object. This takes the uniquified
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/// value from the Builder and wraps it in the Attributes class.
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static Attributes get(Builder &B);
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static Attributes get(LLVMContext &Context, Builder &B);
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/// @brief Return true if the attribute is present.
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bool hasAttribute(AttrVal Val) const;
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/// @brief Return true if attributes exist
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bool hasAttributes() const {
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return Attrs.hasAttributes();
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}
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/// @brief Return true if the attributes are a non-null intersection.
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bool hasAttributes(const Attributes &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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/// @brief Parameter attributes that do not apply to vararg call arguments.
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bool hasIncompatibleWithVarArgsAttrs() const {
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return hasAttribute(Attributes::StructRet);
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}
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/// @brief Attributes that only apply to function parameters.
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bool hasParameterOnlyAttrs() const {
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return hasAttribute(Attributes::ByVal) ||
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hasAttribute(Attributes::Nest) ||
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hasAttribute(Attributes::StructRet) ||
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hasAttribute(Attributes::NoCapture);
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}
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/// @brief Attributes that may be applied to the function itself. These cannot
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/// be used on return values or function parameters.
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bool hasFunctionOnlyAttrs() const {
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return hasAttribute(Attributes::NoReturn) ||
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hasAttribute(Attributes::NoUnwind) ||
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hasAttribute(Attributes::ReadNone) ||
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hasAttribute(Attributes::ReadOnly) ||
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hasAttribute(Attributes::NoInline) ||
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hasAttribute(Attributes::AlwaysInline) ||
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hasAttribute(Attributes::OptimizeForSize) ||
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hasAttribute(Attributes::StackProtect) ||
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hasAttribute(Attributes::StackProtectReq) ||
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hasAttribute(Attributes::NoRedZone) ||
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hasAttribute(Attributes::NoImplicitFloat) ||
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hasAttribute(Attributes::Naked) ||
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hasAttribute(Attributes::InlineHint) ||
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hasAttribute(Attributes::StackAlignment) ||
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hasAttribute(Attributes::UWTable) ||
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hasAttribute(Attributes::NonLazyBind) ||
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hasAttribute(Attributes::ReturnsTwice) ||
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hasAttribute(Attributes::AddressSafety);
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}
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bool isEmptyOrSingleton() const;
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// This is a "safe bool() operator".
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operator const void *() const { return Attrs.Bits ? this : 0; }
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bool operator == (const Attributes &A) const {
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return Attrs.Bits == A.Attrs.Bits;
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}
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bool operator != (const Attributes &A) const {
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return Attrs.Bits != A.Attrs.Bits;
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}
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Attributes operator | (const Attributes &A) const;
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Attributes operator & (const Attributes &A) const;
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Attributes operator ^ (const Attributes &A) const;
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Attributes &operator |= (const Attributes &A);
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Attributes &operator &= (const Attributes &A);
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Attributes operator ~ () const;
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uint64_t Raw() const;
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/// constructAlignmentFromInt - This turns an int alignment (a power of 2,
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/// normally) into the form used internally in Attributes.
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static Attributes constructAlignmentFromInt(unsigned i) {
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// Default alignment, allow the target to define how to align it.
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if (i == 0)
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return Attributes();
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assert(isPowerOf2_32(i) && "Alignment must be a power of two.");
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assert(i <= 0x40000000 && "Alignment too large.");
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return Attributes((Log2_32(i)+1) << 16);
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}
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/// constructStackAlignmentFromInt - This turns an int stack alignment (which
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/// must be a power of 2) into the form used internally in Attributes.
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static Attributes constructStackAlignmentFromInt(unsigned i) {
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// Default alignment, allow the target to define how to align it.
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if (i == 0)
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return Attributes();
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assert(isPowerOf2_32(i) && "Alignment must be a power of two.");
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assert(i <= 0x100 && "Alignment too large.");
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return Attributes((Log2_32(i)+1) << 26);
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}
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/// @brief Which attributes cannot be applied to a type.
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static Attributes typeIncompatible(Type *Ty);
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/// encodeLLVMAttributesForBitcode - This returns an integer containing an
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/// encoding of all the LLVM attributes found in the given attribute bitset.
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/// Any change to this encoding is a breaking change to bitcode compatibility.
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static uint64_t encodeLLVMAttributesForBitcode(Attributes Attrs) {
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// FIXME: It doesn't make sense to store the alignment information as an
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// expanded out value, we should store it as a log2 value. However, we
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// can't just change that here without breaking bitcode compatibility. If
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// this ever becomes a problem in practice, we should introduce new tag
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// numbers in the bitcode file and have those tags use a more efficiently
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// encoded alignment field.
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// Store the alignment in the bitcode as a 16-bit raw value instead of a
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// 5-bit log2 encoded value. Shift the bits above the alignment up by 11
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// bits.
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uint64_t EncodedAttrs = Attrs.Raw() & 0xffff;
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if (Attrs.hasAttribute(Attributes::Alignment))
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EncodedAttrs |= Attrs.getAlignment() << 16;
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EncodedAttrs |= (Attrs.Raw() & (0xfffULL << 21)) << 11;
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return EncodedAttrs;
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}
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/// decodeLLVMAttributesForBitcode - This returns an attribute bitset
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/// containing the LLVM attributes that have been decoded from the given
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/// integer. This function must stay in sync with
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/// 'encodeLLVMAttributesForBitcode'.
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static Attributes decodeLLVMAttributesForBitcode(uint64_t EncodedAttrs) {
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// The alignment is stored as a 16-bit raw value from bits 31--16. We shift
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// the bits above 31 down by 11 bits.
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unsigned Alignment = (EncodedAttrs & (0xffffULL << 16)) >> 16;
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assert((!Alignment || isPowerOf2_32(Alignment)) &&
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"Alignment must be a power of two.");
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Attributes Attrs(EncodedAttrs & 0xffff);
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if (Alignment)
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Attrs |= Attributes::constructAlignmentFromInt(Alignment);
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Attrs |= Attributes((EncodedAttrs & (0xfffULL << 32)) >> 11);
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return Attrs;
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}
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/// getAsString - The set of Attributes set in Attributes is converted to a
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/// string of equivalent mnemonics. This is, presumably, for writing out the
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/// mnemonics for the assembly writer.
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/// @brief Convert attribute bits to text
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std::string getAsString() const;
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};
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//===----------------------------------------------------------------------===//
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// AttributeWithIndex
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//===----------------------------------------------------------------------===//
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/// AttributeWithIndex - This is just a pair of values to associate a set of
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/// attributes with an index.
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struct AttributeWithIndex {
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Attributes 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(unsigned Idx, Attributes 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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// AttrListPtr Smart Pointer
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//===----------------------------------------------------------------------===//
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class AttributeListImpl;
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/// AttrListPtr - This class manages the ref count for the opaque
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/// AttributeListImpl object and provides accessors for it.
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class AttrListPtr {
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/// AttrList - The attributes that we are managing. This can be null
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/// to represent the empty attributes list.
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AttributeListImpl *AttrList;
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public:
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AttrListPtr() : AttrList(0) {}
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AttrListPtr(const AttrListPtr &P);
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const AttrListPtr &operator=(const AttrListPtr &RHS);
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~AttrListPtr();
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//===--------------------------------------------------------------------===//
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// Attribute List Construction and Mutation
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//===--------------------------------------------------------------------===//
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/// get - Return a Attributes list with the specified parameters in it.
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static AttrListPtr get(ArrayRef<AttributeWithIndex> Attrs);
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/// addAttr - Add the specified attribute at the specified index to this
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/// attribute list. Since attribute lists are immutable, this
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/// returns the new list.
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AttrListPtr addAttr(unsigned Idx, Attributes Attrs) const;
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/// removeAttr - Remove the specified attribute at the specified index from
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/// this attribute list. Since attribute lists are immutable, this
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/// returns the new list.
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AttrListPtr removeAttr(unsigned Idx, Attributes Attrs) const;
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//===--------------------------------------------------------------------===//
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// Attribute List Accessors
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//===--------------------------------------------------------------------===//
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/// getParamAttributes - The attributes for the specified index are
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/// returned.
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Attributes getParamAttributes(unsigned Idx) const {
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return getAttributes(Idx);
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}
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/// getRetAttributes - The attributes for the ret value are
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/// returned.
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Attributes getRetAttributes() const {
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return getAttributes(0);
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}
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/// getFnAttributes - The function attributes are returned.
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Attributes getFnAttributes() const {
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return getAttributes(~0U);
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}
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/// paramHasAttr - Return true if the specified parameter index has the
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/// specified attribute set.
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bool paramHasAttr(unsigned Idx, Attributes Attr) const {
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return getAttributes(Idx).hasAttributes(Attr);
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}
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/// getParamAlignment - Return the alignment for the specified function
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/// 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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/// hasAttrSomewhere - Return true if the specified attribute is set for at
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/// least one parameter or for the return value.
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bool hasAttrSomewhere(Attributes Attr) const;
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unsigned getNumAttrs() const;
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Attributes &getAttributesAtIndex(unsigned i) const;
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/// operator==/!= - Provide equality predicates.
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bool operator==(const AttrListPtr &RHS) const
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{ return AttrList == RHS.AttrList; }
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bool operator!=(const AttrListPtr &RHS) const
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{ return AttrList != RHS.AttrList; }
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void dump() const;
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//===--------------------------------------------------------------------===//
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// Attribute List Introspection
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//===--------------------------------------------------------------------===//
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/// getRawPointer - Return a raw pointer that uniquely identifies this
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/// 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
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// slot for each argument that has an attribute. This allows walking over the
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// dense set instead of walking the sparse list of attributes.
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/// isEmpty - Return true if there are no attributes.
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///
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bool isEmpty() const {
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return AttrList == 0;
|
|
}
|
|
|
|
/// getNumSlots - Return the number of slots used in this attribute list.
|
|
/// This is the number of arguments that have an attribute set on them
|
|
/// (including the function itself).
|
|
unsigned getNumSlots() const;
|
|
|
|
/// getSlot - Return the AttributeWithIndex at the specified slot. This
|
|
/// holds a index number plus a set of attributes.
|
|
const AttributeWithIndex &getSlot(unsigned Slot) const;
|
|
|
|
private:
|
|
explicit AttrListPtr(AttributeListImpl *L);
|
|
|
|
/// getAttributes - The attributes for the specified index are
|
|
/// returned. Attributes for the result are denoted with Idx = 0.
|
|
Attributes getAttributes(unsigned Idx) const;
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|