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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135375 91177308-0d34-0410-b5e6-96231b3b80d8
402 lines
15 KiB
C++
402 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 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 declaration of the Type class. For more "Type"
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// stuff, look in DerivedTypes.h.
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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/Support/Casting.h"
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namespace llvm {
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class PointerType;
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class IntegerType;
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class raw_ostream;
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class Module;
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class LLVMContext;
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class LLVMContextImpl;
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template<class GraphType> struct GraphTraits;
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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. Once allocated, Types are never
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/// free'd.
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///
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class Type {
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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 class defined in 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, PowerPC)
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LabelTyID, ///< 6: Labels
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MetadataTyID, ///< 7: Metadata
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X86_MMXTyID, ///< 8: MMX vectors (64 bits, X86 specific)
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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, ///< 9: Arbitrary bit width integers
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FunctionTyID, ///< 10: Functions
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StructTyID, ///< 11: Structures
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ArrayTyID, ///< 12: Arrays
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PointerTyID, ///< 13: Pointers
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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 = X86_MMXTyID,
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FirstDerivedTyID = IntegerTyID
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};
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private:
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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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TypeID ID : 8; // The current base type of this type.
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unsigned SubclassData : 24; // Space for subclasses to store data
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protected:
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friend class LLVMContextImpl;
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explicit Type(LLVMContext &C, TypeID tid)
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: Context(C), ID(tid), SubclassData(0),
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NumContainedTys(0), ContainedTys(0) {}
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~Type() {}
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unsigned getSubclassData() const { return SubclassData; }
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void setSubclassData(unsigned val) {
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SubclassData = val;
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// Ensure we don't have any accidental truncation.
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assert(SubclassData == val && "Subclass data too large for field");
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}
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/// NumContainedTys - Keeps track of how many Type*'s there are in the
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/// ContainedTys list.
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unsigned NumContainedTys;
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/// ContainedTys - A pointer to the array of Types contained by this Type.
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/// For example, this includes the arguments of a function type, the elements
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/// of a structure, the pointee of a pointer, the element type of an array,
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/// etc. This pointer may be 0 for types that don't contain other types
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/// (Integer, Double, Float).
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Type * const *ContainedTys;
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public:
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void print(raw_ostream &O) const;
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void dump() const;
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/// getContext - Return 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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// Accessors for working with 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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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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/// isFloatingPointTy - Return true if this is one of the five floating point
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/// types
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bool isFloatingPointTy() const {
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return ID == FloatTyID || ID == DoubleTyID ||
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ID == X86_FP80TyID || ID == FP128TyID || ID == PPC_FP128TyID;
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}
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/// isX86_MMXTy - Return true if this is X86 MMX.
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bool isX86_MMXTy() const { return ID == X86_MMXTyID; }
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/// isFPOrFPVectorTy - Return true if this is a FP type or a vector of FP.
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///
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bool isFPOrFPVectorTy() const;
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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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/// isIntegerTy - True if this is an instance of IntegerType.
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///
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bool isIntegerTy() const { return ID == IntegerTyID; }
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/// isIntegerTy - Return true if this is an IntegerType of the given width.
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bool isIntegerTy(unsigned Bitwidth) const;
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/// isIntOrIntVectorTy - 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 isIntOrIntVectorTy() const;
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/// isFunctionTy - True if this is an instance of FunctionType.
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///
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bool isFunctionTy() const { return ID == FunctionTyID; }
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/// isStructTy - True if this is an instance of StructType.
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///
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bool isStructTy() const { return ID == StructTyID; }
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/// isArrayTy - True if this is an instance of ArrayType.
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///
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bool isArrayTy() const { return ID == ArrayTyID; }
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/// isPointerTy - True if this is an instance of PointerType.
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///
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bool isPointerTy() const { return ID == PointerTyID; }
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/// isVectorTy - True if this is an instance of VectorType.
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///
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bool isVectorTy() const { return ID == VectorTyID; }
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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(Type *Ty) const;
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/// isEmptyTy - Return true if this type is empty, that is, it has no
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/// elements or all its elements are empty.
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bool isEmptyTy() 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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bool isPrimitiveType() const { return ID <= LastPrimitiveTyID; }
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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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bool isFirstClassType() const {
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return ID != FunctionTyID && ID != VoidTyID;
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}
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/// isSingleValueType - Return true if the type is a valid type for a
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/// register in codegen. This includes all first-class types except struct
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/// and array types.
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///
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bool isSingleValueType() const {
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return (ID != VoidTyID && isPrimitiveType()) ||
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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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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 || isFloatingPointTy() || ID == PointerTyID ||
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ID == X86_MMXTyID)
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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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// Otherwise we have to try harder to decide.
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return 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();
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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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/// getScalarType - If this is a vector type, return the element type,
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/// otherwise return 'this'.
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Type *getScalarType();
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//===--------------------------------------------------------------------===//
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// Type Iteration support.
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//
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typedef Type * const *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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Type *getContainedType(unsigned i) const {
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assert(i < NumContainedTys && "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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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 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 Type *getVoidTy(LLVMContext &C);
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static Type *getLabelTy(LLVMContext &C);
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static Type *getFloatTy(LLVMContext &C);
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static Type *getDoubleTy(LLVMContext &C);
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static Type *getMetadataTy(LLVMContext &C);
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static Type *getX86_FP80Ty(LLVMContext &C);
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static Type *getFP128Ty(LLVMContext &C);
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static Type *getPPC_FP128Ty(LLVMContext &C);
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static Type *getX86_MMXTy(LLVMContext &C);
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static IntegerType *getIntNTy(LLVMContext &C, unsigned N);
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static IntegerType *getInt1Ty(LLVMContext &C);
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static IntegerType *getInt8Ty(LLVMContext &C);
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static IntegerType *getInt16Ty(LLVMContext &C);
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static IntegerType *getInt32Ty(LLVMContext &C);
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static 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 PointerType *getFloatPtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getDoublePtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getX86_FP80PtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getFP128PtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getPPC_FP128PtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getX86_MMXPtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getIntNPtrTy(LLVMContext &C, unsigned N, unsigned AS = 0);
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static PointerType *getInt1PtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getInt8PtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getInt16PtrTy(LLVMContext &C, unsigned AS = 0);
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static PointerType *getInt32PtrTy(LLVMContext &C, unsigned AS = 0);
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static 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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/// getPointerTo - Return a pointer to the current type. This is equivalent
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/// to PointerType::get(Foo, AddrSpace).
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PointerType *getPointerTo(unsigned AddrSpace = 0);
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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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};
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// Printing of types.
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static inline raw_ostream &operator<<(raw_ostream &OS, Type &T) {
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T.print(OS);
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return OS;
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}
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// allow isa<PointerType>(x) to work without DerivedTypes.h included.
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template <> struct isa_impl<PointerType, Type> {
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static inline bool doit(const Type &Ty) {
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return Ty.getTypeID() == Type::PointerTyID;
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}
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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(NodeType *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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} // End llvm namespace
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#endif
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