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#pragma once
#if defined(__ELF__) && !defined(OS_FREEBSD)
#include <vector>
#include <string>
#include <unordered_map>
#include <Common/Elf.h>
#include <boost/noncopyable.hpp>
namespace DB
{
/** Allow to quickly find symbol name from address.
* Used as a replacement for "dladdr" function which is extremely slow.
* It works better than "dladdr" because it also allows to search private symbols, that are not participated in shared linking.
*/
class SymbolIndex : private boost::noncopyable
{
protected:
SymbolIndex() { load(); }
public:
static const SymbolIndex & instance();
struct Symbol
{
const void * address_begin;
const void * address_end;
const char * name;
};
struct Object
{
const void * address_begin;
const void * address_end;
std::string name;
std::shared_ptr<Elf> elf;
};
/// Address in virtual memory should be passed. These addresses include offset where the object is loaded in memory.
const Symbol * findSymbol(const void * address) const;
const Object * findObject(const void * address) const;
const std::vector<Symbol> & symbols() const { return data.symbols; }
const std::vector<Object> & objects() const { return data.objects; }
/// The BuildID that is generated by compiler.
String getBuildID() const { return data.build_id; }
String getBuildIDHex() const;
struct Data
{
std::vector<Symbol> symbols;
std::vector<Object> objects;
String build_id;
};
private:
Data data;
void load();
};
}
#endif
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