530 lines
21 KiB
C++
530 lines
21 KiB
C++
//===-- llvm/Type.h - Classes for handling data types -----------*- 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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#ifndef LLVM_TYPE_H
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#define LLVM_TYPE_H
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#include "llvm/AbstractTypeUser.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/System/Atomic.h"
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#include "llvm/ADT/GraphTraits.h"
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#include <string>
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#include <vector>
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namespace llvm {
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class DerivedType;
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class PointerType;
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class IntegerType;
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class TypeMapBase;
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class raw_ostream;
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class Module;
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/// This file contains the declaration of the Type class. For more "Type" type
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/// stuff, look in DerivedTypes.h.
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///
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/// The instances of the Type class are immutable: once they are created,
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/// they are never changed. Also note that only one instance of a particular
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/// type is ever created. Thus seeing if two types are equal is a matter of
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/// doing a trivial pointer comparison. To enforce that no two equal instances
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/// are created, Type instances can only be created via static factory methods
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/// in class Type and in derived classes.
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///
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/// Once allocated, Types are never free'd, unless they are an abstract type
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/// that is resolved to a more concrete type.
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///
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/// Types themself don't have a name, and can be named either by:
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/// - using SymbolTable instance, typically from some Module,
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/// - using convenience methods in the Module class (which uses module's
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/// SymbolTable too).
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///
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/// Opaque types are simple derived types with no state. There may be many
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/// different Opaque type objects floating around, but two are only considered
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/// identical if they are pointer equals of each other. This allows us to have
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/// two opaque types that end up resolving to different concrete types later.
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///
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/// Opaque types are also kinda weird and scary and different because they have
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/// to keep a list of uses of the type. When, through linking, parsing, or
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/// bitcode reading, they become resolved, they need to find and update all
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/// users of the unknown type, causing them to reference a new, more concrete
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/// type. Opaque types are deleted when their use list dwindles to zero users.
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///
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/// @brief Root of type hierarchy
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class Type : public AbstractTypeUser {
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public:
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//===-------------------------------------------------------------------===//
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/// Definitions of all of the base types for the Type system. Based on this
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/// value, you can cast to a "DerivedType" subclass (see DerivedTypes.h)
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/// Note: If you add an element to this, you need to add an element to the
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/// Type::getPrimitiveType function, or else things will break!
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/// Also update LLVMTypeKind and LLVMGetTypeKind () in the C binding.
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///
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enum TypeID {
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// PrimitiveTypes .. make sure LastPrimitiveTyID stays up to date
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VoidTyID = 0, ///< 0: type with no size
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FloatTyID, ///< 1: 32 bit floating point type
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DoubleTyID, ///< 2: 64 bit floating point type
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X86_FP80TyID, ///< 3: 80 bit floating point type (X87)
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FP128TyID, ///< 4: 128 bit floating point type (112-bit mantissa)
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PPC_FP128TyID, ///< 5: 128 bit floating point type (two 64-bits)
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LabelTyID, ///< 6: Labels
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MetadataTyID, ///< 7: Metadata
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// Derived types... see DerivedTypes.h file...
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// Make sure FirstDerivedTyID stays up to date!!!
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IntegerTyID, ///< 8: Arbitrary bit width integers
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FunctionTyID, ///< 9: Functions
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StructTyID, ///< 10: Structures
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ArrayTyID, ///< 11: Arrays
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PointerTyID, ///< 12: Pointers
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OpaqueTyID, ///< 13: Opaque: type with unknown structure
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VectorTyID, ///< 14: SIMD 'packed' format, or other vector type
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NumTypeIDs, // Must remain as last defined ID
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LastPrimitiveTyID = LabelTyID,
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FirstDerivedTyID = IntegerTyID
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};
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private:
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TypeID ID : 8; // The current base type of this type.
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bool Abstract : 1; // True if type contains an OpaqueType
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unsigned SubclassData : 23; //Space for subclasses to store data
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/// RefCount - This counts the number of PATypeHolders that are pointing to
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/// this type. When this number falls to zero, if the type is abstract and
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/// has no AbstractTypeUsers, the type is deleted. This is only sensical for
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/// derived types.
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///
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mutable sys::cas_flag RefCount;
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/// Context - This refers to the LLVMContext in which this type was uniqued.
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LLVMContext &Context;
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friend class LLVMContextImpl;
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const Type *getForwardedTypeInternal() const;
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// Some Type instances are allocated as arrays, some aren't. So we provide
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// this method to get the right kind of destruction for the type of Type.
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void destroy() const; // const is a lie, this does "delete this"!
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protected:
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explicit Type(LLVMContext &C, TypeID id) :
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ID(id), Abstract(false), SubclassData(0),
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RefCount(0), Context(C),
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ForwardType(0), NumContainedTys(0),
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ContainedTys(0) {}
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virtual ~Type() {
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assert(AbstractTypeUsers.empty() && "Abstract types remain");
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}
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/// Types can become nonabstract later, if they are refined.
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///
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inline void setAbstract(bool Val) { Abstract = Val; }
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unsigned getRefCount() const { return RefCount; }
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unsigned getSubclassData() const { return SubclassData; }
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void setSubclassData(unsigned val) { SubclassData = val; }
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/// ForwardType - This field is used to implement the union find scheme for
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/// abstract types. When types are refined to other types, this field is set
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/// to the more refined type. Only abstract types can be forwarded.
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mutable const Type *ForwardType;
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/// AbstractTypeUsers - Implement a list of the users that need to be notified
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/// if I am a type, and I get resolved into a more concrete type.
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///
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mutable std::vector<AbstractTypeUser *> AbstractTypeUsers;
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/// NumContainedTys - Keeps track of how many PATypeHandle instances there
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/// are at the end of this type instance for the list of contained types. It
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/// is the subclasses responsibility to set this up. Set to 0 if there are no
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/// contained types in this type.
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unsigned NumContainedTys;
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/// ContainedTys - A pointer to the array of Types (PATypeHandle) contained
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/// by this Type. For example, this includes the arguments of a function
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/// type, the elements of a structure, the pointee of a pointer, the element
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/// type of an array, etc. This pointer may be 0 for types that don't
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/// contain other types (Integer, Double, Float). In general, the subclass
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/// should arrange for space for the PATypeHandles to be included in the
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/// allocation of the type object and set this pointer to the address of the
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/// first element. This allows the Type class to manipulate the ContainedTys
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/// without understanding the subclass's placement for this array. keeping
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/// it here also allows the subtype_* members to be implemented MUCH more
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/// efficiently, and dynamically very few types do not contain any elements.
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PATypeHandle *ContainedTys;
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public:
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void print(raw_ostream &O) const;
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/// @brief Debugging support: print to stderr
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void dump() const;
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/// @brief Debugging support: print to stderr (use type names from context
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/// module).
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void dump(const Module *Context) const;
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/// getContext - Fetch the LLVMContext in which this type was uniqued.
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LLVMContext &getContext() const { return Context; }
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//===--------------------------------------------------------------------===//
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// Property accessors for dealing with types... Some of these virtual methods
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// are defined in private classes defined in Type.cpp for primitive types.
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//
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/// getTypeID - Return the type id for the type. This will return one
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/// of the TypeID enum elements defined above.
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///
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inline TypeID getTypeID() const { return ID; }
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/// isVoidTy - Return true if this is 'void'.
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bool isVoidTy() const { return ID == VoidTyID; }
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/// isFloatTy - Return true if this is 'float', a 32-bit IEEE fp type.
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bool isFloatTy() const { return ID == FloatTyID; }
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/// isDoubleTy - Return true if this is 'double', a 64-bit IEEE fp type.
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bool isDoubleTy() const { return ID == DoubleTyID; }
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/// isX86_FP80Ty - Return true if this is x86 long double.
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bool isX86_FP80Ty() const { return ID == X86_FP80TyID; }
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/// isFP128Ty - Return true if this is 'fp128'.
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bool isFP128Ty() const { return ID == FP128TyID; }
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/// isPPC_FP128Ty - Return true if this is powerpc long double.
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bool isPPC_FP128Ty() const { return ID == PPC_FP128TyID; }
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/// isLabelTy - Return true if this is 'label'.
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bool isLabelTy() const { return ID == LabelTyID; }
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/// isMetadataTy - Return true if this is 'metadata'.
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bool isMetadataTy() const { return ID == MetadataTyID; }
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/// getDescription - Return the string representation of the type.
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std::string getDescription() const;
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/// isInteger - True if this is an instance of IntegerType.
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///
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bool isInteger() const { return ID == IntegerTyID; }
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/// isIntOrIntVector - Return true if this is an integer type or a vector of
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/// integer types.
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///
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bool isIntOrIntVector() const;
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/// isFloatingPoint - Return true if this is one of the five floating point
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/// types
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bool isFloatingPoint() const { return ID == FloatTyID || ID == DoubleTyID ||
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ID == X86_FP80TyID || ID == FP128TyID || ID == PPC_FP128TyID; }
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/// isFPOrFPVector - Return true if this is a FP type or a vector of FP types.
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///
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bool isFPOrFPVector() const;
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/// isAbstract - True if the type is either an Opaque type, or is a derived
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/// type that includes an opaque type somewhere in it.
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///
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inline bool isAbstract() const { return Abstract; }
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/// canLosslesslyBitCastTo - Return true if this type could be converted
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/// with a lossless BitCast to type 'Ty'. For example, i8* to i32*. BitCasts
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/// are valid for types of the same size only where no re-interpretation of
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/// the bits is done.
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/// @brief Determine if this type could be losslessly bitcast to Ty
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bool canLosslesslyBitCastTo(const Type *Ty) const;
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/// Here are some useful little methods to query what type derived types are
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/// Note that all other types can just compare to see if this == Type::xxxTy;
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///
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inline bool isPrimitiveType() const { return ID <= LastPrimitiveTyID; }
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inline bool isDerivedType() const { return ID >= FirstDerivedTyID; }
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/// isFirstClassType - Return true if the type is "first class", meaning it
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/// is a valid type for a Value.
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///
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inline bool isFirstClassType() const {
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// There are more first-class kinds than non-first-class kinds, so a
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// negative test is simpler than a positive one.
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return ID != FunctionTyID && ID != VoidTyID && ID != OpaqueTyID;
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}
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/// isSingleValueType - Return true if the type is a valid type for a
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/// virtual register in codegen. This includes all first-class types
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/// except struct and array types.
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///
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inline bool isSingleValueType() const {
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return (ID != VoidTyID && ID <= LastPrimitiveTyID) ||
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ID == IntegerTyID || ID == PointerTyID || ID == VectorTyID;
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}
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/// isAggregateType - Return true if the type is an aggregate type. This
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/// means it is valid as the first operand of an insertvalue or
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/// extractvalue instruction. This includes struct and array types, but
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/// does not include vector types.
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///
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inline bool isAggregateType() const {
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return ID == StructTyID || ID == ArrayTyID;
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}
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/// isSized - Return true if it makes sense to take the size of this type. To
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/// get the actual size for a particular target, it is reasonable to use the
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/// TargetData subsystem to do this.
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///
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bool isSized() const {
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// If it's a primitive, it is always sized.
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if (ID == IntegerTyID || isFloatingPoint() || ID == PointerTyID)
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return true;
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// If it is not something that can have a size (e.g. a function or label),
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// it doesn't have a size.
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if (ID != StructTyID && ID != ArrayTyID && ID != VectorTyID)
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return false;
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// If it is something that can have a size and it's concrete, it definitely
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// has a size, otherwise we have to try harder to decide.
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return !isAbstract() || isSizedDerivedType();
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}
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/// getPrimitiveSizeInBits - Return the basic size of this type if it is a
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/// primitive type. These are fixed by LLVM and are not target dependent.
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/// This will return zero if the type does not have a size or is not a
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/// primitive type.
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///
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/// Note that this may not reflect the size of memory allocated for an
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/// instance of the type or the number of bytes that are written when an
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/// instance of the type is stored to memory. The TargetData class provides
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/// additional query functions to provide this information.
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///
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unsigned getPrimitiveSizeInBits() const;
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/// getScalarSizeInBits - If this is a vector type, return the
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/// getPrimitiveSizeInBits value for the element type. Otherwise return the
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/// getPrimitiveSizeInBits value for this type.
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unsigned getScalarSizeInBits() const;
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/// getFPMantissaWidth - Return the width of the mantissa of this type. This
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/// is only valid on floating point types. If the FP type does not
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/// have a stable mantissa (e.g. ppc long double), this method returns -1.
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int getFPMantissaWidth() const;
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/// getForwardedType - Return the type that this type has been resolved to if
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/// it has been resolved to anything. This is used to implement the
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/// union-find algorithm for type resolution, and shouldn't be used by general
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/// purpose clients.
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const Type *getForwardedType() const {
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if (!ForwardType) return 0;
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return getForwardedTypeInternal();
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}
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/// getVAArgsPromotedType - Return the type an argument of this type
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/// will be promoted to if passed through a variable argument
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/// function.
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const Type *getVAArgsPromotedType(LLVMContext &C) const;
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/// getScalarType - If this is a vector type, return the element type,
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/// otherwise return this.
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const Type *getScalarType() const;
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//===--------------------------------------------------------------------===//
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// Type Iteration support
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//
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typedef PATypeHandle *subtype_iterator;
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subtype_iterator subtype_begin() const { return ContainedTys; }
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subtype_iterator subtype_end() const { return &ContainedTys[NumContainedTys];}
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/// getContainedType - This method is used to implement the type iterator
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/// (defined a the end of the file). For derived types, this returns the
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/// types 'contained' in the derived type.
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///
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const Type *getContainedType(unsigned i) const {
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assert(i < NumContainedTys && "Index out of range!");
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return ContainedTys[i].get();
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}
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/// getNumContainedTypes - Return the number of types in the derived type.
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///
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unsigned getNumContainedTypes() const { return NumContainedTys; }
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//===--------------------------------------------------------------------===//
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// Static members exported by the Type class itself. Useful for getting
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// instances of Type.
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//
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/// getPrimitiveType - Return a type based on an identifier.
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static const Type *getPrimitiveType(LLVMContext &C, TypeID IDNumber);
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//===--------------------------------------------------------------------===//
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// These are the builtin types that are always available...
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//
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static const Type *getVoidTy(LLVMContext &C);
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static const Type *getLabelTy(LLVMContext &C);
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static const Type *getFloatTy(LLVMContext &C);
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static const Type *getDoubleTy(LLVMContext &C);
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static const Type *getMetadataTy(LLVMContext &C);
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static const Type *getX86_FP80Ty(LLVMContext &C);
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static const Type *getFP128Ty(LLVMContext &C);
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static const Type *getPPC_FP128Ty(LLVMContext &C);
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static const IntegerType *getInt1Ty(LLVMContext &C);
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static const IntegerType *getInt8Ty(LLVMContext &C);
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static const IntegerType *getInt16Ty(LLVMContext &C);
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static const IntegerType *getInt32Ty(LLVMContext &C);
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static const IntegerType *getInt64Ty(LLVMContext &C);
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//===--------------------------------------------------------------------===//
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// Convenience methods for getting pointer types with one of the above builtin
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// types as pointee.
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//
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static const PointerType *getFloatPtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getDoublePtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getX86_FP80PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getFP128PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getPPC_FP128PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getInt1PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getInt8PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getInt16PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getInt32PtrTy(LLVMContext &C, unsigned AS = 0);
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static const PointerType *getInt64PtrTy(LLVMContext &C, unsigned AS = 0);
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const Type *) { return true; }
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void addRef() const {
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assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
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sys::AtomicIncrement(&RefCount);
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}
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void dropRef() const {
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assert(isAbstract() && "Cannot drop a reference to a non-abstract type!");
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assert(RefCount && "No objects are currently referencing this object!");
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// If this is the last PATypeHolder using this object, and there are no
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// PATypeHandles using it, the type is dead, delete it now.
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sys::cas_flag OldCount = sys::AtomicDecrement(&RefCount);
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if (OldCount == 0 && AbstractTypeUsers.empty())
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this->destroy();
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}
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/// addAbstractTypeUser - Notify an abstract type that there is a new user of
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/// it. This function is called primarily by the PATypeHandle class.
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///
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void addAbstractTypeUser(AbstractTypeUser *U) const;
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/// removeAbstractTypeUser - Notify an abstract type that a user of the class
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/// no longer has a handle to the type. This function is called primarily by
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/// the PATypeHandle class. When there are no users of the abstract type, it
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/// is annihilated, because there is no way to get a reference to it ever
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/// again.
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///
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void removeAbstractTypeUser(AbstractTypeUser *U) const;
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/// getPointerTo - Return a pointer to the current type. This is equivalent
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/// to PointerType::get(Foo, AddrSpace).
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const PointerType *getPointerTo(unsigned AddrSpace = 0) const;
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private:
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/// isSizedDerivedType - Derived types like structures and arrays are sized
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/// iff all of the members of the type are sized as well. Since asking for
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/// their size is relatively uncommon, move this operation out of line.
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bool isSizedDerivedType() const;
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virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
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virtual void typeBecameConcrete(const DerivedType *AbsTy);
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protected:
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// PromoteAbstractToConcrete - This is an internal method used to calculate
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// change "Abstract" from true to false when types are refined.
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void PromoteAbstractToConcrete();
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friend class TypeMapBase;
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};
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//===----------------------------------------------------------------------===//
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// Define some inline methods for the AbstractTypeUser.h:PATypeHandle class.
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// These are defined here because they MUST be inlined, yet are dependent on
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// the definition of the Type class.
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//
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inline void PATypeHandle::addUser() {
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assert(Ty && "Type Handle has a null type!");
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if (Ty->isAbstract())
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Ty->addAbstractTypeUser(User);
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}
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inline void PATypeHandle::removeUser() {
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if (Ty->isAbstract())
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|
Ty->removeAbstractTypeUser(User);
|
|
}
|
|
|
|
// Define inline methods for PATypeHolder.
|
|
|
|
/// get - This implements the forwarding part of the union-find algorithm for
|
|
/// abstract types. Before every access to the Type*, we check to see if the
|
|
/// type we are pointing to is forwarding to a new type. If so, we drop our
|
|
/// reference to the type.
|
|
///
|
|
inline Type* PATypeHolder::get() const {
|
|
const Type *NewTy = Ty->getForwardedType();
|
|
if (!NewTy) return const_cast<Type*>(Ty);
|
|
return *const_cast<PATypeHolder*>(this) = NewTy;
|
|
}
|
|
|
|
inline void PATypeHolder::addRef() {
|
|
assert(Ty && "Type Holder has a null type!");
|
|
if (Ty->isAbstract())
|
|
Ty->addRef();
|
|
}
|
|
|
|
inline void PATypeHolder::dropRef() {
|
|
if (Ty->isAbstract())
|
|
Ty->dropRef();
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Provide specializations of GraphTraits to be able to treat a type as a
|
|
// graph of sub types...
|
|
|
|
template <> struct GraphTraits<Type*> {
|
|
typedef Type NodeType;
|
|
typedef Type::subtype_iterator ChildIteratorType;
|
|
|
|
static inline NodeType *getEntryNode(Type *T) { return T; }
|
|
static inline ChildIteratorType child_begin(NodeType *N) {
|
|
return N->subtype_begin();
|
|
}
|
|
static inline ChildIteratorType child_end(NodeType *N) {
|
|
return N->subtype_end();
|
|
}
|
|
};
|
|
|
|
template <> struct GraphTraits<const Type*> {
|
|
typedef const Type NodeType;
|
|
typedef Type::subtype_iterator ChildIteratorType;
|
|
|
|
static inline NodeType *getEntryNode(const Type *T) { return T; }
|
|
static inline ChildIteratorType child_begin(NodeType *N) {
|
|
return N->subtype_begin();
|
|
}
|
|
static inline ChildIteratorType child_end(NodeType *N) {
|
|
return N->subtype_end();
|
|
}
|
|
};
|
|
|
|
template <> inline bool isa_impl<PointerType, Type>(const Type &Ty) {
|
|
return Ty.getTypeID() == Type::PointerTyID;
|
|
}
|
|
|
|
raw_ostream &operator<<(raw_ostream &OS, const Type &T);
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|