mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
c5252da873
* wrap code blocks in \code ... \endcode; * refer to parameter names in paragraphs correctly (\arg is not what most people want -- it starts a new paragraph); * use \param instead of \arg to document parameters in order to be consistent with the rest of the codebase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163902 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
//===--- DeltaAlgorithm.h - A Set Minimization Algorithm -------*- C++ -*--===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_DELTAALGORITHM_H
|
|
#define LLVM_ADT_DELTAALGORITHM_H
|
|
|
|
#include <vector>
|
|
#include <set>
|
|
|
|
namespace llvm {
|
|
|
|
/// DeltaAlgorithm - Implements the delta debugging algorithm (A. Zeller '99)
|
|
/// for minimizing arbitrary sets using a predicate function.
|
|
///
|
|
/// The result of the algorithm is a subset of the input change set which is
|
|
/// guaranteed to satisfy the predicate, assuming that the input set did. For
|
|
/// well formed predicates, the result set is guaranteed to be such that
|
|
/// removing any single element would falsify the predicate.
|
|
///
|
|
/// For best results the predicate function *should* (but need not) satisfy
|
|
/// certain properties, in particular:
|
|
/// (1) The predicate should return false on an empty set and true on the full
|
|
/// set.
|
|
/// (2) If the predicate returns true for a set of changes, it should return
|
|
/// true for all supersets of that set.
|
|
///
|
|
/// It is not an error to provide a predicate that does not satisfy these
|
|
/// requirements, and the algorithm will generally produce reasonable
|
|
/// results. However, it may run substantially more tests than with a good
|
|
/// predicate.
|
|
class DeltaAlgorithm {
|
|
public:
|
|
typedef unsigned change_ty;
|
|
// FIXME: Use a decent data structure.
|
|
typedef std::set<change_ty> changeset_ty;
|
|
typedef std::vector<changeset_ty> changesetlist_ty;
|
|
|
|
private:
|
|
/// Cache of failed test results. Successful test results are never cached
|
|
/// since we always reduce following a success.
|
|
std::set<changeset_ty> FailedTestsCache;
|
|
|
|
/// GetTestResult - Get the test result for the \p Changes from the
|
|
/// cache, executing the test if necessary.
|
|
///
|
|
/// \param Changes - The change set to test.
|
|
/// \return - The test result.
|
|
bool GetTestResult(const changeset_ty &Changes);
|
|
|
|
/// Split - Partition a set of changes \p S into one or two subsets.
|
|
void Split(const changeset_ty &S, changesetlist_ty &Res);
|
|
|
|
/// Delta - Minimize a set of \p Changes which has been partioned into
|
|
/// smaller sets, by attempting to remove individual subsets.
|
|
changeset_ty Delta(const changeset_ty &Changes,
|
|
const changesetlist_ty &Sets);
|
|
|
|
/// Search - Search for a subset (or subsets) in \p Sets which can be
|
|
/// removed from \p Changes while still satisfying the predicate.
|
|
///
|
|
/// \param Res - On success, a subset of Changes which satisfies the
|
|
/// predicate.
|
|
/// \return - True on success.
|
|
bool Search(const changeset_ty &Changes, const changesetlist_ty &Sets,
|
|
changeset_ty &Res);
|
|
|
|
protected:
|
|
/// UpdatedSearchState - Callback used when the search state changes.
|
|
virtual void UpdatedSearchState(const changeset_ty &Changes,
|
|
const changesetlist_ty &Sets) {}
|
|
|
|
/// ExecuteOneTest - Execute a single test predicate on the change set \p S.
|
|
virtual bool ExecuteOneTest(const changeset_ty &S) = 0;
|
|
|
|
public:
|
|
virtual ~DeltaAlgorithm();
|
|
|
|
/// Run - Minimize the set \p Changes by executing \see ExecuteOneTest() on
|
|
/// subsets of changes and returning the smallest set which still satisfies
|
|
/// the test predicate.
|
|
changeset_ty Run(const changeset_ty &Changes);
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|