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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
//===- llvm/unittest/ADT/DAGDeltaAlgorithmTest.cpp ------------------------===//
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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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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/DAGDeltaAlgorithm.h"
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#include "gtest/gtest.h"
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#include <algorithm>
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#include <cstdarg>
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using namespace llvm;
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namespace {
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typedef DAGDeltaAlgorithm::edge_ty edge_ty;
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class FixedDAGDeltaAlgorithm : public DAGDeltaAlgorithm {
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changeset_ty FailingSet;
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unsigned NumTests;
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protected:
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bool ExecuteOneTest(const changeset_ty &Changes) override {
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++NumTests;
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return std::includes(Changes.begin(), Changes.end(),
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FailingSet.begin(), FailingSet.end());
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}
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public:
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FixedDAGDeltaAlgorithm(const changeset_ty &_FailingSet)
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: FailingSet(_FailingSet),
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NumTests(0) {}
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unsigned getNumTests() const { return NumTests; }
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};
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std::set<unsigned> fixed_set(unsigned N, ...) {
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std::set<unsigned> S;
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va_list ap;
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va_start(ap, N);
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for (unsigned i = 0; i != N; ++i)
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S.insert(va_arg(ap, unsigned));
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va_end(ap);
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return S;
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}
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std::set<unsigned> range(unsigned Start, unsigned End) {
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std::set<unsigned> S;
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while (Start != End)
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S.insert(Start++);
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return S;
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}
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std::set<unsigned> range(unsigned N) {
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return range(0, N);
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}
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TEST(DAGDeltaAlgorithmTest, Basic) {
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std::vector<edge_ty> Deps;
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// Dependencies:
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// 1 - 3
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Deps.clear();
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Deps.push_back(std::make_pair(3, 1));
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// P = {3,5,7} \in S,
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// [0, 20),
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// should minimize to {1,3,5,7} in a reasonable number of tests.
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FixedDAGDeltaAlgorithm FDA(fixed_set(3, 3, 5, 7));
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EXPECT_EQ(fixed_set(4, 1, 3, 5, 7), FDA.Run(range(20), Deps));
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EXPECT_GE(46U, FDA.getNumTests());
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// Dependencies:
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// 0 - 1
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// \- 2 - 3
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// \- 4
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Deps.clear();
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Deps.push_back(std::make_pair(1, 0));
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Deps.push_back(std::make_pair(2, 0));
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Deps.push_back(std::make_pair(4, 0));
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Deps.push_back(std::make_pair(3, 2));
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// This is a case where we must hold required changes.
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//
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// P = {1,3} \in S,
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// [0, 5),
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// should minimize to {0,1,2,3} in a small number of tests.
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FixedDAGDeltaAlgorithm FDA2(fixed_set(2, 1, 3));
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EXPECT_EQ(fixed_set(4, 0, 1, 2, 3), FDA2.Run(range(5), Deps));
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EXPECT_GE(9U, FDA2.getNumTests());
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// This is a case where we should quickly prune part of the tree.
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//
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// P = {4} \in S,
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// [0, 5),
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// should minimize to {0,4} in a small number of tests.
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FixedDAGDeltaAlgorithm FDA3(fixed_set(1, 4));
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EXPECT_EQ(fixed_set(2, 0, 4), FDA3.Run(range(5), Deps));
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EXPECT_GE(6U, FDA3.getNumTests());
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}
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}
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