Ninja
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00001 // Copyright 2011 Google Inc. All Rights Reserved. 00002 // 00003 // Licensed under the Apache License, Version 2.0 (the "License"); 00004 // you may not use this file except in compliance with the License. 00005 // You may obtain a copy of the License at 00006 // 00007 // http://www.apache.org/licenses/LICENSE-2.0 00008 // 00009 // Unless required by applicable law or agreed to in writing, software 00010 // distributed under the License is distributed on an "AS IS" BASIS, 00011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00012 // See the License for the specific language governing permissions and 00013 // limitations under the License. 00014 00015 #ifndef NINJA_BUILD_LOG_H_ 00016 #define NINJA_BUILD_LOG_H_ 00017 00018 #include <string> 00019 #include <stdio.h> 00020 using namespace std; 00021 00022 #include "hash_map.h" 00023 #include "timestamp.h" 00024 #include "util.h" // uint64_t 00025 00026 struct Edge; 00027 00028 /// Store a log of every command ran for every build. 00029 /// It has a few uses: 00030 /// 00031 /// 1) (hashes of) command lines for existing output files, so we know 00032 /// when we need to rebuild due to the command changing 00033 /// 2) timing information, perhaps for generating reports 00034 /// 3) restat information 00035 struct BuildLog { 00036 BuildLog(); 00037 ~BuildLog(); 00038 00039 bool OpenForWrite(const string& path, string* err); 00040 void RecordCommand(Edge* edge, int start_time, int end_time, 00041 TimeStamp restat_mtime = 0); 00042 void Close(); 00043 00044 /// Load the on-disk log. 00045 bool Load(const string& path, string* err); 00046 00047 struct LogEntry { 00048 string output; 00049 uint64_t command_hash; 00050 int start_time; 00051 int end_time; 00052 TimeStamp restat_mtime; 00053 00054 static uint64_t HashCommand(StringPiece command); 00055 00056 // Used by tests. 00057 bool operator==(const LogEntry& o) { 00058 return output == o.output && command_hash == o.command_hash && 00059 start_time == o.start_time && end_time == o.end_time && 00060 restat_mtime == o.restat_mtime; 00061 } 00062 00063 explicit LogEntry(const string& output); 00064 LogEntry(const string& output, uint64_t command_hash, 00065 int start_time, int end_time, TimeStamp restat_mtime); 00066 }; 00067 00068 /// Lookup a previously-run command by its output path. 00069 LogEntry* LookupByOutput(const string& path); 00070 00071 /// Serialize an entry into a log file. 00072 void WriteEntry(FILE* f, const LogEntry& entry); 00073 00074 /// Rewrite the known log entries, throwing away old data. 00075 bool Recompact(const string& path, string* err); 00076 00077 typedef ExternalStringHashMap<LogEntry*>::Type Entries; 00078 const Entries& entries() const { return entries_; } 00079 00080 private: 00081 Entries entries_; 00082 FILE* log_file_; 00083 bool needs_recompaction_; 00084 }; 00085 00086 #endif // NINJA_BUILD_LOG_H_