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482 lines
18 KiB
C++
482 lines
18 KiB
C++
//===-- llvm/DerivedTypes.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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//
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// This file contains the declarations of classes that represent "derived
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// types". These are things like "arrays of x" or "structure of x, y, z" or
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// "function returning x taking (y,z) as parameters", etc...
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//
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// The implementations of these classes live in the Type.cpp file.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DERIVED_TYPES_H
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#define LLVM_DERIVED_TYPES_H
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#include "llvm/Type.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class Value;
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template<class ValType, class TypeClass> class TypeMap;
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class FunctionValType;
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class ArrayValType;
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class StructValType;
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class PointerValType;
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class VectorValType;
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class IntegerValType;
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class APInt;
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class LLVMContext;
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template<typename T> class ArrayRef;
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class DerivedType : public Type {
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friend class Type;
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protected:
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explicit DerivedType(LLVMContext &C, TypeID id) : Type(C, id) {}
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/// notifyUsesThatTypeBecameConcrete - Notify AbstractTypeUsers of this type
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/// that the current type has transitioned from being abstract to being
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/// concrete.
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///
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void notifyUsesThatTypeBecameConcrete();
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/// dropAllTypeUses - When this (abstract) type is resolved to be equal to
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/// another (more concrete) type, we must eliminate all references to other
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/// types, to avoid some circular reference problems.
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///
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void dropAllTypeUses();
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public:
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//===--------------------------------------------------------------------===//
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// Abstract Type handling methods - These types have special lifetimes, which
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// are managed by (add|remove)AbstractTypeUser. See comments in
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// AbstractTypeUser.h for more information.
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/// refineAbstractTypeTo - This function is used to when it is discovered that
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/// the 'this' abstract type is actually equivalent to the NewType specified.
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/// This causes all users of 'this' to switch to reference the more concrete
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/// type NewType and for 'this' to be deleted.
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///
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void refineAbstractTypeTo(const Type *NewType);
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void dump() const { Type::dump(); }
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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const DerivedType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->isDerivedType();
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}
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};
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/// Class to represent integer types. Note that this class is also used to
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/// represent the built-in integer types: Int1Ty, Int8Ty, Int16Ty, Int32Ty and
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/// Int64Ty.
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/// @brief Integer representation type
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class IntegerType : public DerivedType {
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friend class LLVMContextImpl;
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protected:
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explicit IntegerType(LLVMContext &C, unsigned NumBits) :
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DerivedType(C, IntegerTyID) {
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setSubclassData(NumBits);
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}
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friend class TypeMap<IntegerValType, IntegerType>;
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public:
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/// This enum is just used to hold constants we need for IntegerType.
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enum {
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MIN_INT_BITS = 1, ///< Minimum number of bits that can be specified
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MAX_INT_BITS = (1<<23)-1 ///< Maximum number of bits that can be specified
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///< Note that bit width is stored in the Type classes SubclassData field
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///< which has 23 bits. This yields a maximum bit width of 8,388,607 bits.
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};
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/// This static method is the primary way of constructing an IntegerType.
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/// If an IntegerType with the same NumBits value was previously instantiated,
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/// that instance will be returned. Otherwise a new one will be created. Only
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/// one instance with a given NumBits value is ever created.
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/// @brief Get or create an IntegerType instance.
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static const IntegerType *get(LLVMContext &C, unsigned NumBits);
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/// @brief Get the number of bits in this IntegerType
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unsigned getBitWidth() const { return getSubclassData(); }
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/// getBitMask - Return a bitmask with ones set for all of the bits
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/// that can be set by an unsigned version of this type. This is 0xFF for
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/// i8, 0xFFFF for i16, etc.
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uint64_t getBitMask() const {
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return ~uint64_t(0UL) >> (64-getBitWidth());
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}
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/// getSignBit - Return a uint64_t with just the most significant bit set (the
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/// sign bit, if the value is treated as a signed number).
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uint64_t getSignBit() const {
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return 1ULL << (getBitWidth()-1);
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}
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/// For example, this is 0xFF for an 8 bit integer, 0xFFFF for i16, etc.
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/// @returns a bit mask with ones set for all the bits of this type.
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/// @brief Get a bit mask for this type.
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APInt getMask() const;
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/// This method determines if the width of this IntegerType is a power-of-2
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/// in terms of 8 bit bytes.
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/// @returns true if this is a power-of-2 byte width.
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/// @brief Is this a power-of-2 byte-width IntegerType ?
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bool isPowerOf2ByteWidth() const;
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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const IntegerType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == IntegerTyID;
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}
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};
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/// FunctionType - Class to represent function types
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///
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class FunctionType : public DerivedType {
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friend class TypeMap<FunctionValType, FunctionType>;
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FunctionType(const FunctionType &); // Do not implement
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const FunctionType &operator=(const FunctionType &); // Do not implement
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FunctionType(const Type *Result, ArrayRef<const Type*> Params,
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bool IsVarArgs);
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public:
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/// FunctionType::get - This static method is the primary way of constructing
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/// a FunctionType.
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///
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static FunctionType *get(const Type *Result,
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ArrayRef<const Type*> Params, bool isVarArg);
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/// FunctionType::get - Create a FunctionType taking no parameters.
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///
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static FunctionType *get(const Type *Result, bool isVarArg);
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/// isValidReturnType - Return true if the specified type is valid as a return
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/// type.
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static bool isValidReturnType(const Type *RetTy);
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/// isValidArgumentType - Return true if the specified type is valid as an
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/// argument type.
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static bool isValidArgumentType(const Type *ArgTy);
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bool isVarArg() const { return getSubclassData(); }
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const Type *getReturnType() const { return ContainedTys[0]; }
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typedef Type::subtype_iterator param_iterator;
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param_iterator param_begin() const { return ContainedTys + 1; }
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param_iterator param_end() const { return &ContainedTys[NumContainedTys]; }
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// Parameter type accessors.
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const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
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/// getNumParams - Return the number of fixed parameters this function type
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/// requires. This does not consider varargs.
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///
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unsigned getNumParams() const { return NumContainedTys - 1; }
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// Implement the AbstractTypeUser interface.
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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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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const FunctionType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == FunctionTyID;
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}
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};
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/// CompositeType - Common super class of ArrayType, StructType, PointerType
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/// and VectorType.
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class CompositeType : public DerivedType {
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protected:
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explicit CompositeType(LLVMContext &C, TypeID tid) : DerivedType(C, tid) { }
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public:
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/// getTypeAtIndex - Given an index value into the type, return the type of
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/// the element.
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///
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const Type *getTypeAtIndex(const Value *V) const;
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const Type *getTypeAtIndex(unsigned Idx) const;
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bool indexValid(const Value *V) const;
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bool indexValid(unsigned Idx) const;
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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const CompositeType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == ArrayTyID ||
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T->getTypeID() == StructTyID ||
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T->getTypeID() == PointerTyID ||
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T->getTypeID() == VectorTyID;
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}
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};
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/// StructType - Class to represent struct types, both normal and packed.
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///
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class StructType : public CompositeType {
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friend class TypeMap<StructValType, StructType>;
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StructType(const StructType &); // Do not implement
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const StructType &operator=(const StructType &); // Do not implement
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StructType(LLVMContext &C, ArrayRef<const Type*> Types, bool isPacked);
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public:
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/// StructType::get - This static method is the primary way to create a
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/// StructType.
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///
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static StructType *get(LLVMContext &Context, ArrayRef<const Type*> Elements,
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bool isPacked = false);
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/// StructType::get - Create an empty structure type.
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///
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static StructType *get(LLVMContext &Context, bool isPacked = false);
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/// StructType::get - This static method is a convenience method for creating
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/// structure types by specifying the elements as arguments. Note that this
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/// method always returns a non-packed struct, and requires at least one
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/// element type.
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static StructType *get(const Type *elt1, ...) END_WITH_NULL;
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/// isValidElementType - Return true if the specified type is valid as a
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/// element type.
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static bool isValidElementType(const Type *ElemTy);
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bool isPacked() const { return getSubclassData() != 0 ? true : false; }
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// Iterator access to the elements.
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typedef Type::subtype_iterator element_iterator;
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element_iterator element_begin() const { return ContainedTys; }
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element_iterator element_end() const { return &ContainedTys[NumContainedTys];}
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/// isLayoutIdentical - Return true if this is layout identical to the
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/// specified struct.
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bool isLayoutIdentical(const StructType *Other) const {
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return this == Other;
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}
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// Random access to the elements
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unsigned getNumElements() const { return NumContainedTys; }
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const Type *getElementType(unsigned N) const {
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assert(N < NumContainedTys && "Element number out of range!");
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return ContainedTys[N];
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}
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// Implement the AbstractTypeUser interface.
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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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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const StructType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == StructTyID;
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}
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};
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/// SequentialType - This is the superclass of the array, pointer and vector
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/// type classes. All of these represent "arrays" in memory. The array type
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/// represents a specifically sized array, pointer types are unsized/unknown
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/// size arrays, vector types represent specifically sized arrays that
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/// allow for use of SIMD instructions. SequentialType holds the common
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/// features of all, which stem from the fact that all three lay their
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/// components out in memory identically.
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///
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class SequentialType : public CompositeType {
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PATypeHandle ContainedType; ///< Storage for the single contained type.
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SequentialType(const SequentialType &); // Do not implement!
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const SequentialType &operator=(const SequentialType &); // Do not implement!
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// avoiding warning: 'this' : used in base member initializer list
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SequentialType *this_() { return this; }
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protected:
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SequentialType(TypeID TID, const Type *ElType)
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: CompositeType(ElType->getContext(), TID), ContainedType(ElType, this_()) {
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ContainedTys = &ContainedType;
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NumContainedTys = 1;
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}
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public:
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const Type *getElementType() const { return ContainedTys[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 SequentialType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == ArrayTyID ||
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T->getTypeID() == PointerTyID ||
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T->getTypeID() == VectorTyID;
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}
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};
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/// ArrayType - Class to represent array types.
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///
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class ArrayType : public SequentialType {
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friend class TypeMap<ArrayValType, ArrayType>;
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uint64_t NumElements;
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ArrayType(const ArrayType &); // Do not implement
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const ArrayType &operator=(const ArrayType &); // Do not implement
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ArrayType(const Type *ElType, uint64_t NumEl);
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public:
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/// ArrayType::get - This static method is the primary way to construct an
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/// ArrayType
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///
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static ArrayType *get(const Type *ElementType, uint64_t NumElements);
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/// isValidElementType - Return true if the specified type is valid as a
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/// element type.
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static bool isValidElementType(const Type *ElemTy);
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uint64_t getNumElements() const { return NumElements; }
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// Implement the AbstractTypeUser interface.
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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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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const ArrayType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == ArrayTyID;
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}
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};
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/// VectorType - Class to represent vector types.
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///
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class VectorType : public SequentialType {
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friend class TypeMap<VectorValType, VectorType>;
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unsigned NumElements;
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VectorType(const VectorType &); // Do not implement
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const VectorType &operator=(const VectorType &); // Do not implement
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VectorType(const Type *ElType, unsigned NumEl);
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public:
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/// VectorType::get - This static method is the primary way to construct an
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/// VectorType.
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///
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static VectorType *get(const Type *ElementType, unsigned NumElements);
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/// VectorType::getInteger - This static method gets a VectorType with the
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/// same number of elements as the input type, and the element type is an
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/// integer type of the same width as the input element type.
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///
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static VectorType *getInteger(const VectorType *VTy) {
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unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
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const Type *EltTy = IntegerType::get(VTy->getContext(), EltBits);
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return VectorType::get(EltTy, VTy->getNumElements());
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}
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/// VectorType::getExtendedElementVectorType - This static method is like
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/// getInteger except that the element types are twice as wide as the
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/// elements in the input type.
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///
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static VectorType *getExtendedElementVectorType(const VectorType *VTy) {
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unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
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const Type *EltTy = IntegerType::get(VTy->getContext(), EltBits * 2);
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return VectorType::get(EltTy, VTy->getNumElements());
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}
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/// VectorType::getTruncatedElementVectorType - This static method is like
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/// getInteger except that the element types are half as wide as the
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/// elements in the input type.
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///
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static VectorType *getTruncatedElementVectorType(const VectorType *VTy) {
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unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
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assert((EltBits & 1) == 0 &&
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"Cannot truncate vector element with odd bit-width");
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const Type *EltTy = IntegerType::get(VTy->getContext(), EltBits / 2);
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return VectorType::get(EltTy, VTy->getNumElements());
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}
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/// isValidElementType - Return true if the specified type is valid as a
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/// element type.
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static bool isValidElementType(const Type *ElemTy);
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/// @brief Return the number of elements in the Vector type.
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unsigned getNumElements() const { return NumElements; }
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/// @brief Return the number of bits in the Vector type.
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unsigned getBitWidth() const {
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return NumElements * getElementType()->getPrimitiveSizeInBits();
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}
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// Implement the AbstractTypeUser interface.
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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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// Methods for support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const VectorType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == VectorTyID;
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}
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};
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/// PointerType - Class to represent pointers.
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///
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class PointerType : public SequentialType {
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friend class TypeMap<PointerValType, PointerType>;
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PointerType(const PointerType &); // Do not implement
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const PointerType &operator=(const PointerType &); // Do not implement
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explicit PointerType(const Type *ElType, unsigned AddrSpace);
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public:
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/// PointerType::get - This constructs a pointer to an object of the specified
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/// type in a numbered address space.
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static PointerType *get(const Type *ElementType, unsigned AddressSpace);
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/// PointerType::getUnqual - This constructs a pointer to an object of the
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/// specified type in the generic address space (address space zero).
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static PointerType *getUnqual(const Type *ElementType) {
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return PointerType::get(ElementType, 0);
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}
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/// isValidElementType - Return true if the specified type is valid as a
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/// element type.
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static bool isValidElementType(const Type *ElemTy);
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/// @brief Return the address space of the Pointer type.
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inline unsigned getAddressSpace() const { return getSubclassData(); }
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// Implement the AbstractTypeUser interface.
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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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// Implement support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const PointerType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == PointerTyID;
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}
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};
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/// OpaqueType - Class to represent opaque types.
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///
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class OpaqueType : public DerivedType {
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friend class LLVMContextImpl;
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OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
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const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
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OpaqueType(LLVMContext &C);
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public:
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/// OpaqueType::get - Static factory method for the OpaqueType class.
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///
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static OpaqueType *get(LLVMContext &C);
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// Implement support for type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const OpaqueType *) { return true; }
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static inline bool classof(const Type *T) {
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return T->getTypeID() == OpaqueTyID;
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}
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};
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} // End llvm namespace
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#endif
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