//===-- llvm/Type.h - Classes for handling data types -----------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains the declaration of the Type class. For more "Type" type
-// stuff, look in DerivedTypes.h.
-//
-// Note that instances of the Type class are immutable: once they are created,
-// they are never changed. Also note that only one instance of a particular
-// type is ever created. Thus seeing if two types are equal is a matter of
-// doing a trivial pointer comparison.
-//
-// Types, once allocated, are never free'd, unless they are an abstract type
-// that is resolved to a more concrete type.
-//
-// Opaque types are simple derived types with no state. There may be many
-// different Opaque type objects floating around, but two are only considered
-// identical if they are pointer equals of each other. This allows us to have
-// two opaque types that end up resolving to different concrete types later.
-//
-// Opaque types are also kinda wierd and scary and different because they have
-// to keep a list of uses of the type. When, through linking, parsing, or
-// bytecode reading, they become resolved, they need to find and update all
-// users of the unknown type, causing them to reference a new, more concrete
-// type. Opaque types are deleted when their use list dwindles to zero users.
//
//===----------------------------------------------------------------------===//
+
#ifndef LLVM_TYPE_H
#define LLVM_TYPE_H
-#include "AbstractTypeUser.h"
+#include "llvm/AbstractTypeUser.h"
#include "llvm/Support/Casting.h"
+#include "llvm/Support/DataTypes.h"
#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/iterator"
+#include <string>
#include <vector>
namespace llvm {
class PointerType;
class StructType;
class PackedType;
+class TypeMapBase;
-class Type {
+/// This file contains the declaration of the Type class. For more "Type" type
+/// stuff, look in DerivedTypes.h.
+///
+/// The instances of the Type class are immutable: once they are created,
+/// they are never changed. Also note that only one instance of a particular
+/// type is ever created. Thus seeing if two types are equal is a matter of
+/// doing a trivial pointer comparison. To enforce that no two equal instances
+/// are created, Type instances can only be created via static factory methods
+/// in class Type and in derived classes.
+///
+/// Once allocated, Types are never free'd, unless they are an abstract type
+/// that is resolved to a more concrete type.
+///
+/// Types themself don't have a name, and can be named either by:
+/// - using SymbolTable instance, typically from some Module,
+/// - using convenience methods in the Module class (which uses module's
+/// SymbolTable too).
+///
+/// Opaque types are simple derived types with no state. There may be many
+/// different Opaque type objects floating around, but two are only considered
+/// identical if they are pointer equals of each other. This allows us to have
+/// two opaque types that end up resolving to different concrete types later.
+///
+/// Opaque types are also kinda weird and scary and different because they have
+/// to keep a list of uses of the type. When, through linking, parsing, or
+/// bytecode reading, they become resolved, they need to find and update all
+/// users of the unknown type, causing them to reference a new, more concrete
+/// type. Opaque types are deleted when their use list dwindles to zero users.
+///
+/// @brief Root of type hierarchy
+class Type : public AbstractTypeUser {
public:
///===-------------------------------------------------------------------===//
/// Definitions of all of the base types for the Type system. Based on this
/// value, you can cast to a "DerivedType" subclass (see DerivedTypes.h)
- /// Note: If you add an element to this, you need to add an element to the
+ /// Note: If you add an element to this, you need to add an element to the
/// Type::getPrimitiveType function, or else things will break!
///
enum TypeID {
UIntTyID , IntTyID, // 6, 7: 32 bit types...
ULongTyID , LongTyID, // 8, 9: 64 bit types...
FloatTyID , DoubleTyID, // 10,11: Floating point types...
- LabelTyID , // 12 : Labels...
+ LabelTyID , // 12 : Labels...
// Derived types... see DerivedTypes.h file...
// Make sure FirstDerivedTyID stays up to date!!!
FunctionTyID , StructTyID, // Functions... Structs...
ArrayTyID , PointerTyID, // Array... pointer...
OpaqueTyID, // Opaque type instances...
- PackedTyID, // SIMD 'packed' format...
+ PackedTyID, // SIMD 'packed' format...
//...
NumTypeIDs, // Must remain as last defined ID
LastPrimitiveTyID = LabelTyID,
- FirstDerivedTyID = FunctionTyID,
+ FirstDerivedTyID = FunctionTyID
};
private:
TypeID ID : 8; // The current base type of this type.
- bool Abstract; // True if type contains an OpaqueType
+ bool Abstract : 1; // True if type contains an OpaqueType
/// RefCount - This counts the number of PATypeHolders that are pointing to
/// this type. When this number falls to zero, if the type is abstract and
const Type *getForwardedTypeInternal() const;
protected:
- Type(const std::string& Name, TypeID id);
- virtual ~Type() {}
+ Type(const char *Name, TypeID id);
+ Type(TypeID id) : ID(id), Abstract(false), RefCount(0), ForwardType(0) {}
+ virtual ~Type() {
+ assert(AbstractTypeUsers.empty());
+ }
/// Types can become nonabstract later, if they are refined.
///
inline void setAbstract(bool Val) { Abstract = Val; }
- // PromoteAbstractToConcrete - This is an internal method used to calculate
- // change "Abstract" from true to false when types are refined.
- void PromoteAbstractToConcrete();
-
unsigned getRefCount() const { return RefCount; }
/// ForwardType - This field is used to implement the union find scheme for
/// not contain any elements (most are derived).
std::vector<PATypeHandle> ContainedTys;
+ /// AbstractTypeUsers - Implement a list of the users that need to be notified
+ /// if I am a type, and I get resolved into a more concrete type.
+ ///
+ mutable std::vector<AbstractTypeUser *> AbstractTypeUsers;
public:
- virtual void print(std::ostream &O) const;
+ void print(std::ostream &O) const;
/// @brief Debugging support: print to stderr
- virtual void dump() const;
+ void dump() const;
//===--------------------------------------------------------------------===//
// Property accessors for dealing with types... Some of these virtual methods
/// Float and Double.
///
bool isSigned() const {
- return ID == SByteTyID || ID == ShortTyID ||
- ID == IntTyID || ID == LongTyID;
+ return ID == SByteTyID || ID == ShortTyID ||
+ ID == IntTyID || ID == LongTyID;
}
-
+
/// isUnsigned - Return whether a numeric type is unsigned. This is not quite
/// the complement of isSigned... nonnumeric types return false as they do
/// with isSigned. This returns true for UByteTy, UShortTy, UIntTy, and
/// ULongTy
- ///
+ ///
bool isUnsigned() const {
- return ID == UByteTyID || ID == UShortTyID ||
- ID == UIntTyID || ID == ULongTyID;
+ return ID == UByteTyID || ID == UShortTyID ||
+ ID == UIntTyID || ID == ULongTyID;
}
/// isInteger - Equivalent to isSigned() || isUnsigned()
bool isFloatingPoint() const { return ID == FloatTyID || ID == DoubleTyID; }
/// isAbstract - True if the type is either an Opaque type, or is a derived
- /// type that includes an opaque type somewhere in it.
+ /// type that includes an opaque type somewhere in it.
///
inline bool isAbstract() const { return Abstract; }
inline bool isDerivedType() const { return ID >= FirstDerivedTyID; }
/// isFirstClassType - Return true if the value is holdable in a register.
+ ///
inline bool isFirstClassType() const {
- return (ID != VoidTyID && ID <= LastPrimitiveTyID) ||
+ return (ID != VoidTyID && ID <= LastPrimitiveTyID) ||
ID == PointerTyID || ID == PackedTyID;
}
/// TargetData subsystem to do this.
///
bool isSized() const {
- return (ID >= BoolTyID && ID <= DoubleTyID) || ID == PointerTyID ||
- isSizedDerivedType();
+ // If it's a primitive, it is always sized.
+ if (ID >= BoolTyID && ID <= DoubleTyID || ID == PointerTyID)
+ return true;
+ // If it is not something that can have a size (e.g. a function or label),
+ // it doesn't have a size.
+ if (ID != StructTyID && ID != ArrayTyID && ID != PackedTyID)
+ return false;
+ // If it is something that can have a size and it's concrete, it definitely
+ // has a size, otherwise we have to try harder to decide.
+ return !isAbstract() || isSizedDerivedType();
}
/// getPrimitiveSize - Return the basic size of this type if it is a primitive
/// return zero if the type does not have a size or is not a primitive type.
///
unsigned getPrimitiveSize() const;
+ unsigned getPrimitiveSizeInBits() const;
/// getUnsignedVersion - If this is an integer type, return the unsigned
/// variant of this type. For example int -> uint.
/// getSignedVersion - If this is an integer type, return the signed variant
/// of this type. For example uint -> int.
const Type *getSignedVersion() const;
+
+ /// getIntegralTypeMask - Return a bitmask with ones set for all of the bits
+ /// that can be set by an unsigned version of this type. This is 0xFF for
+ /// sbyte/ubyte, 0xFFFF for shorts, etc.
+ uint64_t getIntegralTypeMask() const {
+ assert(isIntegral() && "This only works for integral types!");
+ return ~uint64_t(0UL) >> (64-getPrimitiveSizeInBits());
+ }
/// getForwaredType - Return the type that this type has been resolved to if
/// it has been resolved to anything. This is used to implement the
return getForwardedTypeInternal();
}
+ /// getVAArgsPromotedType - Return the type an argument of this type
+ /// will be promoted to if passed through a variable argument
+ /// function.
+ const Type *getVAArgsPromotedType() const {
+ if (ID == BoolTyID || ID == UByteTyID || ID == UShortTyID)
+ return Type::UIntTy;
+ else if (ID == SByteTyID || ID == ShortTyID)
+ return Type::IntTy;
+ else if (ID == FloatTyID)
+ return Type::DoubleTy;
+ else
+ return this;
+ }
+
//===--------------------------------------------------------------------===//
// Type Iteration support
//
/// getNumContainedTypes - Return the number of types in the derived type.
///
- unsigned getNumContainedTypes() const { return ContainedTys.size(); }
+ typedef std::vector<PATypeHandle>::size_type size_type;
+ size_type getNumContainedTypes() const { return ContainedTys.size(); }
//===--------------------------------------------------------------------===//
// Static members exported by the Type class itself. Useful for getting
static Type *VoidTy , *BoolTy;
static Type *SByteTy, *UByteTy,
*ShortTy, *UShortTy,
- *IntTy , *UIntTy,
+ *IntTy , *UIntTy,
*LongTy , *ULongTy;
static Type *FloatTy, *DoubleTy;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Type *T) { return true; }
-#include "llvm/Type.def"
-
- // Virtual methods used by callbacks below. These should only be implemented
- // in the DerivedType class.
- virtual void addAbstractTypeUser(AbstractTypeUser *U) const {
- abort(); // Only on derived types!
- }
- virtual void removeAbstractTypeUser(AbstractTypeUser *U) const {
- abort(); // Only on derived types!
- }
-
void addRef() const {
assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
++RefCount;
}
-
+
void dropRef() const {
- assert(isAbstract() && "Cannot drop a refernce to a non-abstract type!");
+ assert(isAbstract() && "Cannot drop a reference to a non-abstract type!");
assert(RefCount && "No objects are currently referencing this object!");
// If this is the last PATypeHolder using this object, and there are no
// PATypeHandles using it, the type is dead, delete it now.
- if (--RefCount == 0)
- RefCountIsZero();
+ if (--RefCount == 0 && AbstractTypeUsers.empty())
+ delete this;
+ }
+
+ /// addAbstractTypeUser - Notify an abstract type that there is a new user of
+ /// it. This function is called primarily by the PATypeHandle class.
+ ///
+ void addAbstractTypeUser(AbstractTypeUser *U) const {
+ assert(isAbstract() && "addAbstractTypeUser: Current type not abstract!");
+ AbstractTypeUsers.push_back(U);
}
+
+ /// removeAbstractTypeUser - Notify an abstract type that a user of the class
+ /// no longer has a handle to the type. This function is called primarily by
+ /// the PATypeHandle class. When there are no users of the abstract type, it
+ /// is annihilated, because there is no way to get a reference to it ever
+ /// again.
+ ///
+ void removeAbstractTypeUser(AbstractTypeUser *U) const;
+
+ /// clearAllTypeMaps - This method frees all internal memory used by the
+ /// type subsystem, which can be used in environments where this memory is
+ /// otherwise reported as a leak.
+ static void clearAllTypeMaps();
+
private:
/// isSizedDerivedType - Derived types like structures and arrays are sized
/// iff all of the members of the type are sized as well. Since asking for
/// their size is relatively uncommon, move this operation out of line.
bool isSizedDerivedType() const;
- virtual void RefCountIsZero() const {
- abort(); // only on derived types!
- }
+ virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
+ virtual void typeBecameConcrete(const DerivedType *AbsTy);
+protected:
+ // PromoteAbstractToConcrete - This is an internal method used to calculate
+ // change "Abstract" from true to false when types are refined.
+ void PromoteAbstractToConcrete();
+ friend class TypeMapBase;
};
//===----------------------------------------------------------------------===//
// Define some inline methods for the AbstractTypeUser.h:PATypeHandle class.
-// These are defined here because they MUST be inlined, yet are dependent on
+// These are defined here because they MUST be inlined, yet are dependent on
// the definition of the Type class. Of course Type derives from Value, which
// contains an AbstractTypeUser instance, so there is no good way to factor out
// the code. Hence this bit of uglyness.
Ty->removeAbstractTypeUser(User);
}
-inline void PATypeHandle::removeUserFromConcrete() {
- if (!Ty->isAbstract())
- Ty->removeAbstractTypeUser(User);
-}
-
// Define inline methods for PATypeHolder...
inline void PATypeHolder::addRef() {
//===----------------------------------------------------------------------===//
-// Provide specializations of GraphTraits to be able to treat a type as a
+// Provide specializations of GraphTraits to be able to treat a type as a
// graph of sub types...
template <> struct GraphTraits<Type*> {
typedef Type::subtype_iterator ChildIteratorType;
static inline NodeType *getEntryNode(Type *T) { return T; }
- static inline ChildIteratorType child_begin(NodeType *N) {
- return N->subtype_begin();
+ static inline ChildIteratorType child_begin(NodeType *N) {
+ return N->subtype_begin();
}
- static inline ChildIteratorType child_end(NodeType *N) {
+ static inline ChildIteratorType child_end(NodeType *N) {
return N->subtype_end();
}
};
typedef Type::subtype_iterator ChildIteratorType;
static inline NodeType *getEntryNode(const Type *T) { return T; }
- static inline ChildIteratorType child_begin(NodeType *N) {
- return N->subtype_begin();
+ static inline ChildIteratorType child_begin(NodeType *N) {
+ return N->subtype_begin();
}
- static inline ChildIteratorType child_end(NodeType *N) {
+ static inline ChildIteratorType child_end(NodeType *N) {
return N->subtype_end();
}
};
-template <> inline bool isa_impl<PointerType, Type>(const Type &Ty) {
+template <> inline bool isa_impl<PointerType, Type>(const Type &Ty) {
return Ty.getTypeID() == Type::PointerTyID;
}
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