mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
625ea21205
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3571 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
//===-- llvm/Support/ConstantRange.h - Represent a range --------*- C++ -*-===//
|
|
//
|
|
// Represent a range of possible values that may occur when the program is run
|
|
// for an integral value. This keeps track of a lower and upper bound for the
|
|
// constant, which MAY wrap around the end of the numeric range. To do this, it
|
|
// keeps track of a [lower, upper) bound, which specifies an interval just like
|
|
// STL iterators. When used with boolean values, the following are important
|
|
// ranges (other integral ranges use min/max values for special range values):
|
|
//
|
|
// [F, F) = {} = Empty set
|
|
// [T, F) = {T}
|
|
// [F, T) = {F}
|
|
// [T, T) = {F, T} = Full set
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_CONSTANT_RANGE_H
|
|
#define LLVM_SUPPORT_CONSTANT_RANGE_H
|
|
|
|
#include "Support/DataTypes.h"
|
|
#include <iosfwd>
|
|
class ConstantIntegral;
|
|
class Type;
|
|
|
|
class ConstantRange {
|
|
ConstantIntegral *Lower, *Upper;
|
|
public:
|
|
/// Initialize a full (the default) or empty set for the specified type.
|
|
///
|
|
ConstantRange(const Type *Ty, bool isFullSet = true);
|
|
|
|
/// Initialize a range of values explicitly... this will assert out if
|
|
/// Lower==Upper and Lower != Min or Max for its type (or if the two constants
|
|
/// have different types)
|
|
///
|
|
ConstantRange(ConstantIntegral *Lower, ConstantIntegral *Upper);
|
|
|
|
/// Initialize a set of values that all satisfy the condition with C.
|
|
///
|
|
ConstantRange(unsigned SetCCOpcode, ConstantIntegral *C);
|
|
|
|
/// getLower - Return the lower value for this range...
|
|
///
|
|
ConstantIntegral *getLower() const { return Lower; }
|
|
|
|
/// getUpper - Return the upper value for this range...
|
|
///
|
|
ConstantIntegral *getUpper() const { return Upper; }
|
|
|
|
/// getType - Return the LLVM data type of this range.
|
|
///
|
|
const Type *getType() const;
|
|
|
|
/// isFullSet - Return true if this set contains all of the elements possible
|
|
/// for this data-type
|
|
///
|
|
bool isFullSet() const;
|
|
|
|
/// isEmptySet - Return true if this set contains no members.
|
|
///
|
|
bool isEmptySet() const;
|
|
|
|
/// isWrappedSet - Return true if this set wraps around the top of the range,
|
|
/// for example: [100, 8)
|
|
///
|
|
bool isWrappedSet() const;
|
|
|
|
/// getSingleElement - If this set contains a single element, return it,
|
|
/// otherwise return null.
|
|
///
|
|
ConstantIntegral *getSingleElement() const;
|
|
|
|
/// isSingleElement - Return true if this set contains exactly one member.
|
|
///
|
|
bool isSingleElement() const { return getSingleElement() != 0; }
|
|
|
|
/// getSetSize - Return the number of elements in this set.
|
|
///
|
|
uint64_t getSetSize() const;
|
|
|
|
/// operator== - Return true if this range is equal to another range.
|
|
///
|
|
bool operator==(const ConstantRange &CR) const {
|
|
return Lower == CR.Lower && Upper == CR.Upper;
|
|
}
|
|
bool operator!=(const ConstantRange &CR) const {
|
|
return !operator==(CR);
|
|
}
|
|
|
|
/// intersect - Return the range that results from the intersection of this
|
|
/// range with another range. The resultant range is pruned as much as
|
|
/// possible, but there may be cases where elements are included that are in
|
|
/// one of the sets but not the other. For example: [100, 8) intersect [3,
|
|
/// 120) yields [3, 120)
|
|
///
|
|
ConstantRange intersectWith(const ConstantRange &CR) const;
|
|
|
|
/// union - Return the range that results from the union of this range with
|
|
/// another range. The resultant range is guaranteed to include the elements
|
|
/// of both sets, but may contain more. For example, [3, 9) union [12,15) is
|
|
/// [3, 15), which includes 9, 10, and 11, which were not included in either
|
|
/// set before.
|
|
///
|
|
ConstantRange unionWith(const ConstantRange &CR) const;
|
|
|
|
/// print - Print out the bounds to a stream...
|
|
///
|
|
void print(std::ostream &OS) const;
|
|
|
|
/// dump - Allow printing from a debugger easily...
|
|
///
|
|
void dump() const;
|
|
};
|
|
|
|
inline std::ostream &operator<<(std::ostream &OS, const ConstantRange &CR) {
|
|
CR.print(OS);
|
|
return OS;
|
|
}
|
|
|
|
#endif
|