// 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 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.
-//
-//===----------------------------------------------------------------------===//
+
#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 PackedType;
class TypeMapBase;
+/// 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:
///===-------------------------------------------------------------------===//
/// 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
Ty->dropRef();
}
-/// get - This implements the forwarding part of the union-find algorithm for
-/// abstract types. Before every access to the Type*, we check to see if the
-/// type we are pointing to is forwarding to a new type. If so, we drop our
-/// reference to the type.
-///
-inline Type* PATypeHolder::get() const {
- const Type *NewTy = Ty->getForwardedType();
- if (!NewTy) return const_cast<Type*>(Ty);
- return *const_cast<PATypeHolder*>(this) = NewTy;
-}
-
-
//===----------------------------------------------------------------------===//
// Provide specializations of GraphTraits to be able to treat a type as a