1// Copyright 2015 Google Inc. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#ifndef NINJA_DYNDEP_LOADER_H_
16#define NINJA_DYNDEP_LOADER_H_
17
18#include <map>
19#include <string>
20#include <vector>
21
22struct DiskInterface;
23struct Edge;
24struct Node;
25struct State;
26
27/// Store dynamically-discovered dependency information for one edge.
28struct Dyndeps {
29 Dyndeps() : used_(false), restat_(false) {}
30 bool used_;
31 bool restat_;
32 std::vector<Node*> implicit_inputs_;
33 std::vector<Node*> implicit_outputs_;
34};
35
36/// Store data loaded from one dyndep file. Map from an edge
37/// to its dynamically-discovered dependency information.
38/// This is a struct rather than a typedef so that we can
39/// forward-declare it in other headers.
40struct DyndepFile: public std::map<Edge*, Dyndeps> {};
41
42/// DyndepLoader loads dynamically discovered dependencies, as
43/// referenced via the "dyndep" attribute in build files.
44struct DyndepLoader {
45 DyndepLoader(State* state, DiskInterface* disk_interface)
46 : state_(state), disk_interface_(disk_interface) {}
47
48 /// Load a dyndep file from the given node's path and update the
49 /// build graph with the new information. One overload accepts
50 /// a caller-owned 'DyndepFile' object in which to store the
51 /// information loaded from the dyndep file.
52 bool LoadDyndeps(Node* node, std::string* err) const;
53 bool LoadDyndeps(Node* node, DyndepFile* ddf, std::string* err) const;
54
55 private:
56 bool LoadDyndepFile(Node* file, DyndepFile* ddf, std::string* err) const;
57
58 bool UpdateEdge(Edge* edge, Dyndeps const* dyndeps, std::string* err) const;
59
60 State* state_;
61 DiskInterface* disk_interface_;
62};
63
64#endif // NINJA_DYNDEP_LOADER_H_
65