1#pragma once
2
3#if defined(__ELF__) && !defined(__FreeBSD__)
4
5#include <vector>
6#include <string>
7#include <Common/Elf.h>
8#include <boost/noncopyable.hpp>
9
10
11namespace DB
12{
13
14/** Allow to quickly find symbol name from address.
15 * Used as a replacement for "dladdr" function which is extremely slow.
16 * It works better than "dladdr" because it also allows to search private symbols, that are not participated in shared linking.
17 */
18class SymbolIndex : private boost::noncopyable
19{
20protected:
21 SymbolIndex() { update(); }
22
23public:
24 static SymbolIndex & instance();
25
26 struct Symbol
27 {
28 const void * address_begin;
29 const void * address_end;
30 const char * name;
31 };
32
33 struct Object
34 {
35 const void * address_begin;
36 const void * address_end;
37 std::string name;
38 std::unique_ptr<Elf> elf;
39 };
40
41 /// Address in virtual memory should be passed. These addresses include offset where the object is loaded in memory.
42 const Symbol * findSymbol(const void * address) const;
43 const Object * findObject(const void * address) const;
44
45 const std::vector<Symbol> & symbols() const { return data.symbols; }
46 const std::vector<Object> & objects() const { return data.objects; }
47
48 struct Data
49 {
50 std::vector<Symbol> symbols;
51 std::vector<Object> objects;
52 };
53private:
54 Data data;
55
56 void update();
57};
58
59}
60
61#endif
62