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98dc202be0
'class llvm::DAGDeltaAlgorithm' has virtual functions and accessible non-virtual destructor Not sure if this is the best solution, but this class has state and some of the classes that inherit from it also do, so it looks appropriate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105675 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
3.0 KiB
C++
76 lines
3.0 KiB
C++
//===--- DAGDeltaAlgorithm.h - A DAG Minimization Algorithm ----*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_DAGDELTAALGORITHM_H
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#define LLVM_ADT_DAGDELTAALGORITHM_H
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#include <vector>
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#include <set>
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namespace llvm {
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/// DAGDeltaAlgorithm - Implements a "delta debugging" algorithm for minimizing
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/// directed acyclic graphs using a predicate function.
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///
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/// The result of the algorithm is a subset of the input change set which is
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/// guaranteed to satisfy the predicate, assuming that the input set did. For
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/// well formed predicates, the result set is guaranteed to be such that
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/// removing any single element not required by the dependencies on the other
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/// elements would falsify the predicate.
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///
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/// The DAG should be used to represent dependencies in the changes which are
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/// likely to hold across the predicate function. That is, for a particular
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/// changeset S and predicate P:
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///
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/// P(S) => P(S union pred(S))
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///
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/// The minization algorithm uses this dependency information to attempt to
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/// eagerly prune large subsets of changes. As with \see DeltaAlgorithm, the DAG
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/// is not required to satisfy this property, but the algorithm will run
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/// substantially fewer tests with appropriate dependencies. \see DeltaAlgorithm
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/// for more information on the properties which the predicate function itself
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/// should satisfy.
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class DAGDeltaAlgorithm {
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public:
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typedef unsigned change_ty;
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typedef std::pair<change_ty, change_ty> edge_ty;
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// FIXME: Use a decent data structure.
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typedef std::set<change_ty> changeset_ty;
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typedef std::vector<changeset_ty> changesetlist_ty;
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public:
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virtual ~DAGDeltaAlgorithm() {}
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/// Run - Minimize the DAG formed by the \arg Changes vertices and the \arg
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/// Dependencies edges by executing \see ExecuteOneTest() on subsets of
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/// changes and returning the smallest set which still satisfies the test
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/// predicate and the input \arg Dependencies.
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///
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/// \param Changes The list of changes.
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///
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/// \param Dependencies The list of dependencies amongst changes. For each
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/// (x,y) in \arg Dependencies, both x and y must be in \arg Changes. The
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/// minimization algorithm guarantees that for each tested changed set S, x
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/// \in S implies y \in S. It is an error to have cyclic dependencies.
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changeset_ty Run(const changeset_ty &Changes,
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const std::vector<edge_ty> &Dependencies);
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/// UpdatedSearchState - Callback used when the search state changes.
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virtual void UpdatedSearchState(const changeset_ty &Changes,
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const changesetlist_ty &Sets,
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const changeset_ty &Required) {}
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/// ExecuteOneTest - Execute a single test predicate on the change set \arg S.
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virtual bool ExecuteOneTest(const changeset_ty &S) = 0;
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};
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} // end namespace llvm
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#endif
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