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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@697 91177308-0d34-0410-b5e6-96231b3b80d8
275 lines
10 KiB
C++
275 lines
10 KiB
C++
//===-- llvm/Type.h - Classes for handling data types ------------*- C++ -*--=//
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//
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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 and Opt/ConstantHandling.h
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//
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// Note that 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.
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//
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// Types, once allocated, are never free'd.
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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 wierd 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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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TYPE_H
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#define LLVM_TYPE_H
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#include "llvm/Value.h"
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#include "llvm/Support/GraphTraits.h"
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class DerivedType;
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class MethodType;
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class ArrayType;
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class PointerType;
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class StructType;
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class OpaqueType;
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class Type : public Value {
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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 PrimitiveID {
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VoidTyID = 0 , BoolTyID, // 0, 1: Basics...
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UByteTyID , SByteTyID, // 2, 3: 8 bit types...
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UShortTyID , ShortTyID, // 4, 5: 16 bit types...
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UIntTyID , IntTyID, // 6, 7: 32 bit types...
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ULongTyID , LongTyID, // 8, 9: 64 bit types...
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FloatTyID , DoubleTyID, // 10,11: Floating point types...
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TypeTyID, // 12 : Type definitions
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LabelTyID , // 13 : 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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MethodTyID , StructTyID, // Methods... Structs...
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ArrayTyID , PointerTyID, // Array... pointer...
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OpaqueTyID, // Opaque type instances...
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//PackedTyID , // SIMD 'packed' format... TODO
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//...
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NumPrimitiveIDs, // Must remain as last defined ID
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FirstDerivedTyID = MethodTyID,
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};
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private:
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PrimitiveID ID; // The current base type of this type...
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unsigned UID; // The unique ID number for this class
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string Desc; // The printed name of the string...
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bool Abstract; // True if type contains an OpaqueType
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bool Recursive; // True if the type is recursive
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protected:
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// ctor is protected, so only subclasses can create Type objects...
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Type(const string &Name, PrimitiveID id);
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virtual ~Type() {}
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// When types are refined, they update their description to be more concrete.
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//
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inline void setDescription(const string &D) { Desc = D; }
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// setName - Associate the name with this type in the symbol table, but don't
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// set the local name to be equal specified name.
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//
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virtual void setName(const string &Name, SymbolTable *ST = 0);
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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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// Types can become recursive later, if they are refined.
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//
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inline void setRecursive(bool Val) { Recursive = Val; }
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public:
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//===--------------------------------------------------------------------===//
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// Property accessors for dealing with types...
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//
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// getPrimitiveID - Return the base type of the type. This will return one
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// of the PrimitiveID enum elements defined above.
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//
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inline PrimitiveID getPrimitiveID() const { return ID; }
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// getUniqueID - Returns the UID of the type. This can be thought of as a
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// small integer version of the pointer to the type class. Two types that are
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// structurally different have different UIDs. This can be used for indexing
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// types into an array.
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//
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inline unsigned getUniqueID() const { return UID; }
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// getDescription - Return the string representation of the type...
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inline const string &getDescription() const { return Desc; }
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// isSigned - Return whether a numeric type is signed.
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virtual bool isSigned() const { return 0; }
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// isUnsigned - Return whether a numeric type is unsigned. This is not
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// quite the complement of isSigned... nonnumeric types return false as they
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// do with isSigned.
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//
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virtual bool isUnsigned() const { return 0; }
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// isIntegral - Equilivent to isSigned() || isUnsigned, but with only a single
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// virtual function invocation.
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//
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virtual bool isIntegral() const { return 0; }
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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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// isRecursive - True if the type graph contains a cycle.
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//
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inline bool isRecursive() const { return Recursive; }
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//===--------------------------------------------------------------------===//
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// Type Iteration support
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//
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class TypeIterator;
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typedef TypeIterator subtype_iterator;
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inline subtype_iterator subtype_begin() const; // DEFINED BELOW
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inline subtype_iterator subtype_end() const; // DEFINED BELOW
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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 types
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// 'contained' in the derived type, returning 0 when 'i' becomes invalid. This
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// allows the user to iterate over the types in a struct, for example, really
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// easily.
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//
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virtual const Type *getContainedType(unsigned i) const { return 0; }
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// getNumContainedTypes - Return the number of types in the derived type
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virtual unsigned getNumContainedTypes() const { return 0; }
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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/getUniqueIDType - Return a type based on an identifier.
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static const Type *getPrimitiveType(PrimitiveID IDNumber);
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static const Type *getUniqueIDType(unsigned UID);
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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 Type *VoidTy , *BoolTy;
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static Type *SByteTy, *UByteTy,
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*ShortTy, *UShortTy,
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*IntTy , *UIntTy,
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*LongTy , *ULongTy;
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static Type *FloatTy, *DoubleTy;
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static Type *TypeTy , *LabelTy;
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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 < FirstDerivedTyID; }
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inline bool isDerivedType() const { return ID >= FirstDerivedTyID; }
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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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static inline bool classof(const Value *V) {
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return V->getValueType() == Value::TypeVal;
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}
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// Methods for determining the subtype of this Type. This section defines a
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// family of isArrayType(), isLabelType(), etc functions...
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//
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#define HANDLE_PRIM_TYPE(NAME, SIZE) \
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inline bool is##NAME##Type() const { return ID == NAME##TyID; }
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#define HANDLE_DERV_TYPE(NAME, CLASS) \
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inline bool is##NAME##Type() const { return ID == NAME##TyID; }
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#include "llvm/Type.def"
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private:
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class TypeIterator : public std::bidirectional_iterator<const Type,
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ptrdiff_t> {
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const Type * const Ty;
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unsigned Idx;
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typedef TypeIterator _Self;
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public:
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inline TypeIterator(const Type *ty, unsigned idx) : Ty(ty), Idx(idx) {}
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inline ~TypeIterator() {}
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inline bool operator==(const _Self& x) const { return Idx == x.Idx; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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inline pointer operator*() const { return Ty->getContainedType(Idx); }
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inline pointer operator->() const { return operator*(); }
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inline _Self& operator++() { ++Idx; return *this; } // Preincrement
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inline _Self operator++(int) { // Postincrement
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_Self tmp = *this; ++*this; return tmp;
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}
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inline _Self& operator--() { --Idx; return *this; } // Predecrement
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inline _Self operator--(int) { // Postdecrement
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_Self tmp = *this; --*this; return tmp;
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}
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};
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};
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inline Type::TypeIterator Type::subtype_begin() const {
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return TypeIterator(this, 0);
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}
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inline Type::TypeIterator Type::subtype_end() const {
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return TypeIterator(this, getNumContainedTypes());
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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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#endif
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