diff options
Diffstat (limited to 'src/build_log.cc')
| -rw-r--r-- | src/build_log.cc | 64 |
1 files changed, 59 insertions, 5 deletions
diff --git a/src/build_log.cc b/src/build_log.cc index 5803ada..97c3344 100644 --- a/src/build_log.cc +++ b/src/build_log.cc @@ -37,10 +37,57 @@ namespace { const char kFileSignature[] = "# ninja log v%d\n"; -const int kCurrentVersion = 4; +const int kCurrentVersion = 5; + +// 64bit MurmurHash2, by Austin Appleby +#if defined(_MSC_VER) +#define BIG_CONSTANT(x) (x) +#else // defined(_MSC_VER) +#define BIG_CONSTANT(x) (x##LLU) +#endif // !defined(_MSC_VER) +inline +uint64_t MurmurHash64A(const void* key, int len) { + static const uint64_t seed = 0xDECAFBADDECAFBADull; + const uint64_t m = BIG_CONSTANT(0xc6a4a7935bd1e995); + const int r = 47; + uint64_t h = seed ^ (len * m); + const uint64_t * data = (const uint64_t *)key; + const uint64_t * end = data + (len/8); + while(data != end) { + uint64_t k = *data++; + k *= m; + k ^= k >> r; + k *= m; + h ^= k; + h *= m; + } + const unsigned char* data2 = (const unsigned char*)data; + switch(len & 7) + { + case 7: h ^= uint64_t(data2[6]) << 48; + case 6: h ^= uint64_t(data2[5]) << 40; + case 5: h ^= uint64_t(data2[4]) << 32; + case 4: h ^= uint64_t(data2[3]) << 24; + case 3: h ^= uint64_t(data2[2]) << 16; + case 2: h ^= uint64_t(data2[1]) << 8; + case 1: h ^= uint64_t(data2[0]); + h *= m; + }; + h ^= h >> r; + h *= m; + h ^= h >> r; + return h; +} +#undef BIG_CONSTANT + } // namespace +// static +uint64_t BuildLog::LogEntry::HashCommand(StringPiece command) { + return MurmurHash64A(command.str_, command.len_); +} + BuildLog::BuildLog() : log_file_(NULL), config_(NULL), needs_recompaction_(false) {} @@ -95,7 +142,7 @@ void BuildLog::RecordCommand(Edge* edge, int start_time, int end_time, log_entry->output = path; log_.insert(Log::value_type(log_entry->output, log_entry)); } - log_entry->command = command; + log_entry->command_hash = LogEntry::HashCommand(command); log_entry->start_time = start_time; log_entry->end_time = end_time; log_entry->restat_mtime = restat_mtime; @@ -239,7 +286,14 @@ bool BuildLog::Load(const string& path, string* err) { entry->start_time = start_time; entry->end_time = end_time; entry->restat_mtime = restat_mtime; - entry->command = string(start, end - start); + if (log_version >= 5) { + char c = *end; *end = '\0'; + entry->command_hash = (uint64_t)strtoull(start, NULL, 10); + *end = c; + } + else + entry->command_hash = LogEntry::HashCommand(StringPiece(start, + end - start)); } // Decide whether it's time to rebuild the log: @@ -267,9 +321,9 @@ BuildLog::LogEntry* BuildLog::LookupByOutput(const string& path) { } void BuildLog::WriteEntry(FILE* f, const LogEntry& entry) { - fprintf(f, "%d\t%d\t%ld\t%s\t%s\n", + fprintf(f, "%d\t%d\t%ld\t%s\t%llu\n", entry.start_time, entry.end_time, (long) entry.restat_mtime, - entry.output.c_str(), entry.command.c_str()); + entry.output.c_str(), entry.command_hash); } bool BuildLog::Recompact(const string& path, string* err) { |