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115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
//===--- DeltaAlgorithm.cpp - A Set Minimization Algorithm -----*- C++ -*--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/DeltaAlgorithm.h"
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#include <algorithm>
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#include <iterator>
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#include <set>
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using namespace llvm;
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DeltaAlgorithm::~DeltaAlgorithm() {
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}
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bool DeltaAlgorithm::GetTestResult(const changeset_ty &Changes) {
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if (FailedTestsCache.count(Changes))
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return false;
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bool Result = ExecuteOneTest(Changes);
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if (!Result)
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FailedTestsCache.insert(Changes);
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return Result;
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}
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void DeltaAlgorithm::Split(const changeset_ty &S, changesetlist_ty &Res) {
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// FIXME: Allow clients to provide heuristics for improved splitting.
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// FIXME: This is really slow.
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changeset_ty LHS, RHS;
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unsigned idx = 0, N = S.size() / 2;
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for (changeset_ty::const_iterator it = S.begin(),
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ie = S.end(); it != ie; ++it, ++idx)
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((idx < N) ? LHS : RHS).insert(*it);
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if (!LHS.empty())
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Res.push_back(LHS);
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if (!RHS.empty())
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Res.push_back(RHS);
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}
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DeltaAlgorithm::changeset_ty
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DeltaAlgorithm::Delta(const changeset_ty &Changes,
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const changesetlist_ty &Sets) {
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// Invariant: union(Res) == Changes
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UpdatedSearchState(Changes, Sets);
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// If there is nothing left we can remove, we are done.
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if (Sets.size() <= 1)
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return Changes;
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// Look for a passing subset.
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changeset_ty Res;
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if (Search(Changes, Sets, Res))
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return Res;
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// Otherwise, partition the sets if possible; if not we are done.
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changesetlist_ty SplitSets;
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for (changesetlist_ty::const_iterator it = Sets.begin(),
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ie = Sets.end(); it != ie; ++it)
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Split(*it, SplitSets);
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if (SplitSets.size() == Sets.size())
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return Changes;
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return Delta(Changes, SplitSets);
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}
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bool DeltaAlgorithm::Search(const changeset_ty &Changes,
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const changesetlist_ty &Sets,
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changeset_ty &Res) {
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// FIXME: Parallelize.
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for (changesetlist_ty::const_iterator it = Sets.begin(),
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ie = Sets.end(); it != ie; ++it) {
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// If the test passes on this subset alone, recurse.
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if (GetTestResult(*it)) {
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changesetlist_ty Sets;
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Split(*it, Sets);
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Res = Delta(*it, Sets);
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return true;
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}
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// Otherwise, if we have more than two sets, see if test passes on the
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// complement.
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if (Sets.size() > 2) {
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// FIXME: This is really slow.
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changeset_ty Complement;
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std::set_difference(
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Changes.begin(), Changes.end(), it->begin(), it->end(),
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std::insert_iterator<changeset_ty>(Complement, Complement.begin()));
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if (GetTestResult(Complement)) {
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changesetlist_ty ComplementSets;
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ComplementSets.insert(ComplementSets.end(), Sets.begin(), it);
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ComplementSets.insert(ComplementSets.end(), it + 1, Sets.end());
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Res = Delta(Complement, ComplementSets);
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return true;
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}
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}
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}
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return false;
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}
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DeltaAlgorithm::changeset_ty DeltaAlgorithm::Run(const changeset_ty &Changes) {
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// Check empty set first to quickly find poor test functions.
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if (GetTestResult(changeset_ty()))
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return changeset_ty();
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// Otherwise run the real delta algorithm.
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changesetlist_ty Sets;
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Split(Changes, Sets);
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return Delta(Changes, Sets);
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}
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