graph_utils.h revision aea4c1cea20dda7ae7e85fc8924a2d784f70d806 
1//
2// Copyright (C) 2009 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_GRAPH_UTILS_H_
18#define UPDATE_ENGINE_PAYLOAD_GENERATOR_GRAPH_UTILS_H_
19
20#include <vector>
21
22#include <base/macros.h>
23
24#include "update_engine/payload_generator/graph_types.h"
25#include "update_engine/update_metadata.pb.h"
26
27// A few utility functions for graphs
28
29namespace chromeos_update_engine {
30
31namespace graph_utils {
32
33// Returns the number of blocks represented by all extents in the edge.
34uint64_t EdgeWeight(const Graph& graph, const Edge& edge);
35
36// These add a read-before dependency from graph[src] -> graph[dst]. If the dep
37// already exists, the block/s is/are added to the existing edge.
38void AddReadBeforeDep(Vertex* src,
39                      Vertex::Index dst,
40                      uint64_t block);
41void AddReadBeforeDepExtents(Vertex* src,
42                             Vertex::Index dst,
43                             const std::vector<Extent>& extents);
44
45void DropWriteBeforeDeps(Vertex::EdgeMap* edge_map);
46
47// For each node N in graph, drop all edges N->|index|.
48void DropIncomingEdgesTo(Graph* graph, Vertex::Index index);
49
50void DumpGraph(const Graph& graph);
51
52}  // namespace graph_utils
53
54}  // namespace chromeos_update_engine
55
56#endif  // UPDATE_ENGINE_PAYLOAD_GENERATOR_GRAPH_UTILS_H_
57