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#include "CompDBCache.h"
#include <sys/stat.h>
#include <cassert>
CompDBCache::CompDBCache()
: db_(nullptr), mtime_(0) {
}
CompDBCache::~CompDBCache() {
clear();
}
CXCompilationDatabase CompDBCache::fromDirectory(const std::string &buildDir,
CXCompilationDatabase_Error *error) {
assert(error != nullptr);
const std::string jsonFilename = constructJsonDbFilename(buildDir);
const time_t mtime = modificationTime(jsonFilename);
if (jsonFilename == filename_ && mtime != 0 && mtime == mtime_) {
// Using the cached compilation database.
// Just set the provided error code to indicate success.
*error = CXCompilationDatabase_NoError;
} else {
clear();
db_ = clang_CompilationDatabase_fromDirectory(buildDir.c_str(), error);
if (mtime != 0 && *error == CXCompilationDatabase_NoError) {
// Successfully loaded a JSON compilation database.
// Cache the result.
filename_ = jsonFilename;
mtime_ = mtime;
}
}
return db_;
}
void CompDBCache::clear() {
if (db_) {
clang_CompilationDatabase_dispose(db_);
db_ = nullptr;
filename_.clear();
mtime_ = 0;
}
}
std::string CompDBCache::constructJsonDbFilename(const std::string &buildDir) const {
std::string ret = buildDir;
if (!buildDir.empty() && buildDir.back() != '/')
ret += '/';
ret += "compile_commands.json";
return ret;
}
time_t CompDBCache::modificationTime(const std::string &filename) const {
time_t mtime = 0;
#ifdef _WIN32
struct _stat st;
const int statRes = _stat(filename.c_str(), &st);
#else
struct stat st;
const int statRes = stat(filename.c_str(), &st);
#endif
if (statRes == 0)
mtime = st.st_mtime;
return mtime;
}
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