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This is the final patch for this PR. It implements some minor cleanup in the use of IntegerType, to wit: 1. Type::getIntegerTypeMask -> IntegerType::getBitMask 2. Type::Int*Ty changed to IntegerType* from Type* 3. ConstantInt::getType() returns IntegerType* now, not Type* This also fixes PR1120. Patch by Sheng Zhou. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33370 91177308-0d34-0410-b5e6-96231b3b80d8
387 lines
15 KiB
C++
387 lines
15 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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/Support/Casting.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/ADT/iterator"
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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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/// 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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/// bytecode 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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///
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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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LabelTyID, ///< 3: Labels
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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, ///< 4: Arbitrary bit width integers
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FunctionTyID, ///< 5: Functions
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StructTyID, ///< 6: Structures
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PackedStructTyID,///< 7: Packed Structure. This is for bytecode only
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ArrayTyID, ///< 8: Arrays
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PointerTyID, ///< 9: Pointers
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OpaqueTyID, ///< 10: Opaque: type with unknown structure
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PackedTyID, ///< 11: 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 unsigned RefCount;
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const Type *getForwardedTypeInternal() const;
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protected:
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Type(const char *Name, TypeID id);
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Type(TypeID id) : ID(id), Abstract(false), SubclassData(0), RefCount(0),
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ForwardType(0) {}
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virtual ~Type() {
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assert(AbstractTypeUsers.empty());
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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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/// ContainedTys - The list of types contained by this one. For example, this
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/// includes the arguments of a function type, the elements of the structure,
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/// the pointee of a pointer, etc. Note that keeping this vector in the Type
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/// class wastes some space for types that do not contain anything (such as
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/// primitive types). However, keeping it here allows the subtype_* members
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/// to be implemented MUCH more efficiently, and dynamically very few types do
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/// not contain any elements (most are derived).
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std::vector<PATypeHandle> ContainedTys;
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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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public:
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void print(std::ostream &O) const;
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void print(std::ostream *O) const { if (O) print(*O); }
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/// @brief Debugging support: print to stderr
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void dump() const;
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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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/// getDescription - Return the string representation of the type...
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const 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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/// isFloatingPoint - Return true if this is one of the two floating point
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/// types
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bool isFloatingPoint() const { return ID == FloatTyID || ID == DoubleTyID; }
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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, uint to int. 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 value is holdable in a register.
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///
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inline bool isFirstClassType() const {
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return (ID != VoidTyID && ID <= LastPrimitiveTyID) ||
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ID == IntegerTyID || ID == PointerTyID || ID == PackedTyID;
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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 != PackedTyID &&
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ID != PackedStructTyID)
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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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/// getPrimitiveSize - Return the basic size of this type if it is a primitive
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/// type. These are fixed by LLVM and are not target dependent. This will
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/// return zero if the type does not have a size or is not a primitive type.
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///
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unsigned getPrimitiveSizeInBits() const;
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/// getForwaredType - 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() const;
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//===--------------------------------------------------------------------===//
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// Type Iteration support
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//
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typedef std::vector<PATypeHandle>::const_iterator subtype_iterator;
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subtype_iterator subtype_begin() const { return ContainedTys.begin(); }
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subtype_iterator subtype_end() const { return ContainedTys.end(); }
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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 < ContainedTys.size() && "Index out of range!");
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return ContainedTys[i];
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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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typedef std::vector<PATypeHandle>::size_type size_type;
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size_type getNumContainedTypes() const { return ContainedTys.size(); }
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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(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 *VoidTy, *LabelTy, *FloatTy, *DoubleTy;
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static const IntegerType *Int1Ty, *Int8Ty, *Int16Ty, *Int32Ty, *Int64Ty;
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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 *T) { 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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++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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if (--RefCount == 0 && AbstractTypeUsers.empty())
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delete this;
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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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assert(isAbstract() && "addAbstractTypeUser: Current type not abstract!");
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AbstractTypeUsers.push_back(U);
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}
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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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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);
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}
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// Define inline methods for PATypeHolder...
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inline void PATypeHolder::addRef() {
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if (Ty->isAbstract())
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Ty->addRef();
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}
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inline void PATypeHolder::dropRef() {
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if (Ty->isAbstract())
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Ty->dropRef();
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}
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//===----------------------------------------------------------------------===//
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// Provide specializations of GraphTraits to be able to treat a type as a
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// graph of sub types...
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template <> struct GraphTraits<Type*> {
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typedef Type NodeType;
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typedef Type::subtype_iterator ChildIteratorType;
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static inline NodeType *getEntryNode(Type *T) { return T; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->subtype_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->subtype_end();
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}
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};
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template <> struct GraphTraits<const Type*> {
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typedef const Type NodeType;
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typedef Type::subtype_iterator ChildIteratorType;
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static inline NodeType *getEntryNode(const Type *T) { return T; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->subtype_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->subtype_end();
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}
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};
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template <> inline bool isa_impl<PointerType, Type>(const Type &Ty) {
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return Ty.getTypeID() == Type::PointerTyID;
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}
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std::ostream &operator<<(std::ostream &OS, const Type &T);
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} // End llvm namespace
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#endif
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