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// 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 <string>
#include <stdio.h>
using namespace std;
#include "hash_map.h"
#include "timestamp.h"
#include "util.h" // uint64_t
struct Edge;
/// Can answer questions about the manifest for the BuildLog.
struct BuildLogUser {
/// Return if a given output is no longer part of the build manifest.
/// This is only called during recompaction and doesn't have to be fast.
virtual bool IsPathDead(StringPiece s) const = 0;
};
/// Store a log of every command ran for every build.
/// It has a few uses:
///
/// 1) (hashes of) command lines for existing output files, so we know
/// when we need to rebuild due to the command changing
/// 2) timing information, perhaps for generating reports
/// 3) restat information
struct BuildLog {
BuildLog();
~BuildLog();
bool OpenForWrite(const string& path, const BuildLogUser& user, string* err);
bool RecordCommand(Edge* edge, int start_time, int end_time,
TimeStamp restat_mtime = 0);
void Close();
/// Load the on-disk log.
bool Load(const string& path, string* err);
struct LogEntry {
string output;
uint64_t command_hash;
int start_time;
int end_time;
TimeStamp restat_mtime;
static uint64_t HashCommand(StringPiece command);
// Used by tests.
bool operator==(const LogEntry& o) {
return output == o.output && command_hash == o.command_hash &&
start_time == o.start_time && end_time == o.end_time &&
restat_mtime == o.restat_mtime;
}
explicit LogEntry(const string& output);
LogEntry(const string& output, uint64_t command_hash,
int start_time, int end_time, TimeStamp restat_mtime);
};
/// Lookup a previously-run command by its output path.
LogEntry* LookupByOutput(const string& path);
/// Serialize an entry into a log file.
bool WriteEntry(FILE* f, const LogEntry& entry);
/// Rewrite the known log entries, throwing away old data.
bool Recompact(const string& path, const BuildLogUser& user, string* err);
typedef ExternalStringHashMap<LogEntry*>::Type Entries;
const Entries& entries() const { return entries_; }
private:
Entries entries_;
FILE* log_file_;
bool needs_recompaction_;
};
#endif // NINJA_BUILD_LOG_H_
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