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The sefault occurs due to an infinite loop when the verifier tries to determine the size of a type of the form "%rt = type { %rt }" while checking an alloca of the type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196626 91177308-0d34-0410-b5e6-96231b3b80d8
456 lines
17 KiB
C++
456 lines
17 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_IR_DERIVEDTYPES_H
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#define LLVM_IR_DERIVEDTYPES_H
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#include "llvm/IR/Type.h"
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#include "llvm/Support/Compiler.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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class APInt;
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class LLVMContext;
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template<typename T> class ArrayRef;
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class StringRef;
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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 Type {
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friend class LLVMContextImpl;
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protected:
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explicit IntegerType(LLVMContext &C, unsigned NumBits) : Type(C, IntegerTyID){
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setSubclassData(NumBits);
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}
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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 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 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 Type {
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FunctionType(const FunctionType &) LLVM_DELETED_FUNCTION;
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const FunctionType &operator=(const FunctionType &) LLVM_DELETED_FUNCTION;
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FunctionType(Type *Result, ArrayRef<Type*> Params, 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(Type *Result,
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ArrayRef<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(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(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(Type *ArgTy);
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bool isVarArg() const { return getSubclassData()!=0; }
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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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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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/// Methods for support type inquiry through isa, cast, and dyn_cast.
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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 Type {
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protected:
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explicit CompositeType(LLVMContext &C, TypeID tid) : Type(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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Type *getTypeAtIndex(const Value *V);
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Type *getTypeAtIndex(unsigned Idx);
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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 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. There are two different kinds
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/// of struct types: Literal structs and Identified structs.
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///
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/// Literal struct types (e.g. { i32, i32 }) are uniqued structurally, and must
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/// always have a body when created. You can get one of these by using one of
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/// the StructType::get() forms.
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///
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/// Identified structs (e.g. %foo or %42) may optionally have a name and are not
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/// uniqued. The names for identified structs are managed at the LLVMContext
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/// level, so there can only be a single identified struct with a given name in
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/// a particular LLVMContext. Identified structs may also optionally be opaque
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/// (have no body specified). You get one of these by using one of the
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/// StructType::create() forms.
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///
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/// Independent of what kind of struct you have, the body of a struct type are
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/// laid out in memory consequtively with the elements directly one after the
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/// other (if the struct is packed) or (if not packed) with padding between the
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/// elements as defined by DataLayout (which is required to match what the code
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/// generator for a target expects).
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///
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class StructType : public CompositeType {
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StructType(const StructType &) LLVM_DELETED_FUNCTION;
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const StructType &operator=(const StructType &) LLVM_DELETED_FUNCTION;
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StructType(LLVMContext &C)
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: CompositeType(C, StructTyID), SymbolTableEntry(0) {}
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enum {
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/// This is the contents of the SubClassData field.
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SCDB_HasBody = 1,
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SCDB_Packed = 2,
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SCDB_IsLiteral = 4,
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SCDB_IsSized = 8
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};
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/// SymbolTableEntry - For a named struct that actually has a name, this is a
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/// pointer to the symbol table entry (maintained by LLVMContext) for the
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/// struct. This is null if the type is an literal struct or if it is
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/// a identified type that has an empty name.
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///
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void *SymbolTableEntry;
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public:
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~StructType() {
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delete [] ContainedTys; // Delete the body.
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}
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/// StructType::create - This creates an identified struct.
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static StructType *create(LLVMContext &Context, StringRef Name);
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static StructType *create(LLVMContext &Context);
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static StructType *create(ArrayRef<Type*> Elements,
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StringRef Name,
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bool isPacked = false);
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static StructType *create(ArrayRef<Type*> Elements);
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static StructType *create(LLVMContext &Context,
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ArrayRef<Type*> Elements,
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StringRef Name,
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bool isPacked = false);
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static StructType *create(LLVMContext &Context, ArrayRef<Type*> Elements);
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static StructType *create(StringRef Name, Type *elt1, ...) END_WITH_NULL;
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/// StructType::get - This static method is the primary way to create a
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/// literal StructType.
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static StructType *get(LLVMContext &Context, ArrayRef<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(Type *elt1, ...) END_WITH_NULL;
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bool isPacked() const { return (getSubclassData() & SCDB_Packed) != 0; }
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/// isLiteral - Return true if this type is uniqued by structural
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/// equivalence, false if it is a struct definition.
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bool isLiteral() const { return (getSubclassData() & SCDB_IsLiteral) != 0; }
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/// isOpaque - Return true if this is a type with an identity that has no body
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/// specified yet. These prints as 'opaque' in .ll files.
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bool isOpaque() const { return (getSubclassData() & SCDB_HasBody) == 0; }
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/// isSized - Return true if this is a sized type.
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bool isSized(SmallPtrSet<const Type*, 4> *Visited = 0) const;
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/// hasName - Return true if this is a named struct that has a non-empty name.
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bool hasName() const { return SymbolTableEntry != 0; }
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/// getName - Return the name for this struct type if it has an identity.
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/// This may return an empty string for an unnamed struct type. Do not call
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/// this on an literal type.
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StringRef getName() const;
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/// setName - Change the name of this type to the specified name, or to a name
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/// with a suffix if there is a collision. Do not call this on an literal
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/// type.
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void setName(StringRef Name);
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/// setBody - Specify a body for an opaque identified type.
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void setBody(ArrayRef<Type*> Elements, bool isPacked = false);
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void setBody(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(Type *ElemTy);
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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(StructType *Other) const;
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/// Random access to the elements
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unsigned getNumElements() const { return NumContainedTys; }
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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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/// Methods for support type inquiry through isa, cast, and dyn_cast.
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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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Type *ContainedType; ///< Storage for the single contained type.
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SequentialType(const SequentialType &) LLVM_DELETED_FUNCTION;
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const SequentialType &operator=(const SequentialType &) LLVM_DELETED_FUNCTION;
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protected:
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SequentialType(TypeID TID, Type *ElType)
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: CompositeType(ElType->getContext(), TID), ContainedType(ElType) {
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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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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 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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uint64_t NumElements;
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ArrayType(const ArrayType &) LLVM_DELETED_FUNCTION;
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const ArrayType &operator=(const ArrayType &) LLVM_DELETED_FUNCTION;
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ArrayType(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(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(Type *ElemTy);
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uint64_t getNumElements() const { return NumElements; }
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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) {
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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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unsigned NumElements;
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VectorType(const VectorType &) LLVM_DELETED_FUNCTION;
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const VectorType &operator=(const VectorType &) LLVM_DELETED_FUNCTION;
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VectorType(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(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(VectorType *VTy) {
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unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
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assert(EltBits && "Element size must be of a non-zero size");
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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(VectorType *VTy) {
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unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
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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(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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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(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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/// Returns zero when the vector is a vector of pointers.
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unsigned getBitWidth() const {
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return NumElements * getElementType()->getPrimitiveSizeInBits();
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}
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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) {
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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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PointerType(const PointerType &) LLVM_DELETED_FUNCTION;
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const PointerType &operator=(const PointerType &) LLVM_DELETED_FUNCTION;
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explicit PointerType(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(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(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(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 support type inquiry through isa, cast, and dyn_cast.
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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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} // End llvm namespace
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#endif
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