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// bpf globals functionality shared between translator and stapbpf
// Copyright (C) 2016-2021 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#ifndef BPF_SHARED_GLOBALS_H
#define BPF_SHARED_GLOBALS_H
namespace bpf {
// PR23476 List of percpu stat fields (see struct stat_data in runtime/stat.h).
std::vector<globals::stat_field> globals::stat_fields {
"count", "sum", // for @count(), @sum(), @avg()
// TODO: also "shift"
// TODO: "min", "max", // for @min(), @max()
// TODO: "avg_s", "_M2", "variance", "variance_s", // for @variance()
// TODO: "histogram", // PR24424 for @hist_linear(), @hist_log()
};
// XXX Use the map for this field when iterating keys or testing inclusion:
std::string globals::stat_iter_field = "count";
globals::interned_stats_map
globals::intern_stats_map(const globals::stats_map &sm) {
globals::interned_stats_map ism;
for (globals::stat_field sf : globals::stat_fields)
{
auto it = sm.find(sf);
assert (it != sm.end());
ism.push_back(it->second);
}
return ism;
}
globals::stats_map
globals::deintern_stats_map(const globals::interned_stats_map &ism) {
globals::stats_map sm;
for (unsigned i = 0; i < std::min(ism.size(), globals::stat_fields.size()); i++)
{
globals::stat_field sf = globals::stat_fields[i];
globals::map_idx map_id = ism[i];
sm[sf] = map_id;
}
return sm;
}
globals::interned_foreach_info
globals::intern_foreach_info(const globals::foreach_info &fi) {
globals::interned_foreach_info ifi{
(uint64_t)fi.sort_direction,
(uint64_t)fi.sort_column,
(uint64_t)fi.keysize,
(uint64_t)fi.sort_column_size,
(uint64_t)fi.sort_column_ofs,
};
return ifi;
}
globals::foreach_info
globals::deintern_foreach_info(const globals::interned_foreach_info &ifi) {
assert(ifi.size() == globals::n_foreach_info_fields);
// XXX could handle older versions depending on ifi.size()
// eventually we'll need a magic string for .bo versioning
globals::foreach_info fi;
fi.sort_direction = (int)ifi[0];
fi.sort_column = (unsigned)ifi[1];
fi.keysize = (size_t)ifi[2];
fi.sort_column_size = (size_t)ifi[3];
fi.sort_column_ofs = (int)ifi[4];
return fi;
}
};
#endif
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