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