summaryrefslogtreecommitdiffstats
path: root/src/build_log.h
blob: 51cbe5ed753d73bffb4c0663c37d0579e79d6da9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef NINJA_BUILD_LOG_H_
#define NINJA_BUILD_LOG_H_

#include <map>
#include <string>
using namespace std;

#include "hash_map.h"

struct BuildConfig;
struct Edge;

/// Store a log of every command ran for every build.
/// It has a few uses:
///
/// 1) historical command lines for output files, so we know
///    when we need to rebuild due to the command changing
/// 2) historical timing information
/// 3) maybe we can generate some sort of build overview output
///    from it
struct BuildLog {
  BuildLog();
  ~BuildLog();

  void SetConfig(BuildConfig* config) { config_ = config; }
  bool OpenForWrite(const string& path, string* err);
  void RecordCommand(Edge* edge, int start_time, int end_time,
                     time_t restat_mtime = 0);
  void Close();

  /// Load the on-disk log.
  bool Load(const string& path, string* err);

  struct LogEntry {
    string output;
    string command;
    int start_time;
    int end_time;
    time_t restat_mtime;

    // Used by tests.
    bool operator==(const LogEntry& o) {
      return output == o.output && command == o.command &&
          start_time == o.start_time && end_time == o.end_time &&
          restat_mtime == o.restat_mtime;
    }
  };

  /// Lookup a previously-run command by its output path.
  LogEntry* LookupByOutput(const string& path);

  /// Serialize an entry into a log file.
  void WriteEntry(FILE* f, const LogEntry& entry);

  /// Rewrite the known log entries, throwing away old data.
  bool Recompact(const string& path, string* err);

  // TODO: make these private.
  typedef ExternalStringHashMap<LogEntry*>::Type Log;
  Log log_;
private:
  FILE* log_file_;
  BuildConfig* config_;
  bool needs_recompaction_;
};

#endif // NINJA_BUILD_LOG_H_